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Engine Specific Info and Questions => IDI Engine => Topic started by: Powered by Spearco on March 13, 2011, 09:30:01 pm
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How would a Garrett GT2056 turbo perform on a 1.6TD?
Its got a 46AR for the turbine with a 72 trim, and a 56mm, 55trim, 53AR compressor.
I'd love to here what people have to say.
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2056v?
that the one you find on 2.8 jeep liberties?
i think some have played around with that one, and said it works fine, but its a bit on the large side...
so, it should be JUST PERFECT for you josh..
what were you going to put it on? the Rocco engine?
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I don't want any VNT turbos.
I'm talking about a straight up GT2056 wastegated turbo. The map looks great and the price is affordable.
Also can anyone tell me if any of the Borg Warner EFR turbos are a good choise?
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Here is some great info on the EFR turbos. Good reading hear.
http://www.full-race.com/articles/borgwarner-efr-turbos.html (http://www.full-race.com/articles/borgwarner-efr-turbos.html).
Here is one on Ebay.
http://cgi.ebay.com/ebaymotors/Borg-Warner-Turbo-EFR-6758-64A-R-WG-T25-Single-Scroll-_W0QQcmdZViewItemQQhashZitem56423e661dQQitemZ370478573085QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories (http://cgi.ebay.com/ebaymotors/Borg-Warner-Turbo-EFR-6758-64A-R-WG-T25-Single-Scroll-_W0QQcmdZViewItemQQhashZitem56423e661dQQitemZ370478573085QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories).
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:o almost $18 hundo!!!!
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You want to play, you gotta pay. ;D
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I've looked into that turbo and it looks good if you're able to spool it. Spooling with a GTB2056VL or GTB2056VK would be easier ;)
Assumptions:
- 1.6l displacement
- 85% Volumetric efficiency (kinda best case for a heavy ported 8V?)
- 100F intake air temp
(http://i14.photobucket.com/albums/a345/Alcaid/GTD/GT2056.jpg)
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wasn't malone running some kind of a gt20 on his franken engine
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I don't know...now this has me wondering as I am almost ready to buy a 2256vk for my 1.6. How do you read the turbo maps is what I probably will need to know.
From what I have heard about the 2056 is that it works very well on the 1.9TDI. We should have a little more rpm flow than them so it should work for us.
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Do you mean the 2056vk or the 2260vk?
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I am unsure if that turbo is suitable for normal driving conditions... I have one on my ~1.7l and I get about 15lbs of boost at 5500rpm... I might have some other problems though.. I am going to update my last thread now.
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So are you going to sell the 2560R turbo? How much?
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Do you mean the 2056vk or the 2260vk?
gt2256vk
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Do you mean the 2056vk or the 2260vk?
gt2256vk
That's an MB turbo?
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Do you mean the 2056vk or the 2260vk?
gt2256vk
That's an MB turbo?
Yes. It is off of a sprinter
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Conclusive result on the gt2056. Not a good turbo for my application. Spools quite fast (faster than a t3), but hits surge at about 3800rpm and 16lbs of boost.
For clarity as to what I put it on, its a 2nd overbore 1.6l hydraulic TD block, ceramic coated crowns, moly coated skirts, 3" dp to a 2.5" straightpipe exh, cranked up pump, 1.9l head ported, ALH intake manifold, large front mount IC, 2" hotside charge pipe, 2.5" coldside charge pipe,a bunch of other stuff.... in a scirocco.
So that is what I have and this turbo does NOT work well with my application. :(
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What's the part number of that turbo? Funny surging on that low boost and that high RPMs.... ???
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yeah i agree that doesn't seem right especially with that setup
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its just a straight 2056 right? or is it a VNT? if so, do you have vane control?
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No V. Its a straight wastegated turbo. PN# GT2056 - 751578 - 2
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I ran into a similar issue with what I thought was the turbo surging at higher rpms and it turned out that I was starving for fuel at the injection pump. I changed the fuel filter and installed a bigger feed pump and problem solved.
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the surging is clearly audible. It is a loud fluttering noise. I dont think fueling is a problem because when I set the charge pressure to 15psi, I can easily hit 1500°F on the freeway..
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the surging is clearly audible. It is a loud fluttering noise. I dont think fueling is a problem because when I set the charge pressure to 15psi, I can easily hit 1500°F on the freeway..
Man that's strange but I don't doubt you at all. I had read a post somewhere on tdi club that turbo surge is impossible after 2000 rpm. I'm sure they were talking about vnts but the same rules should apply to all turbos. That's what led me to find my fueling issue. My fuel issue also felt and sounded like a fluttering of some kind but I think that was caused by the style of lift pump I had.
I wonder what would happen if you increased the size of the hot charge pipe to 2.5" as well. What kind of air filter do you have on it?
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The air cleaner is of the K&N variety. Its kinda ovalish. I have not done a pleat count though. I also find it rather wierd that it would surge that badly at such a low boost pressure, but the only logic I can deduce from it is that the engine does not process enough air and that is what is causing the surging.
changing the hotside charge pipe might make a difference, but I doubt it. After all, when it leaves the intercooler and goes to the intake manifold, it is reduced to 2" as it is an ALH manifold.
Like I said, perhaps I am doing it wrong..
The fluttering is very prominent after 16psi and it holds there. One thought is that when the engine is not up to operating temp, it pulled to 23psi without surging, but after it got hotter, it would flutter. I kinda stopped messing with it cause I didnt want the shaft to break.
FWIW, it was mentioned a while ago in another thread that I posted in that surge does not happen with stock engine that has been modded. I tend to disagree. On the engine that was in the Scirocco before (1.6l NA 11mm bolts, metal HG, mech lifters, blocked off DV, disconnected WG) I noticed that after a WOT pull, the turbo would surge during spool down making a fluttering noise. Someone said that it was not possible as the turbo would stop spooling faster than the engine could decel. After that I went out and drove the car and observed boost still present during decel, so I debunked that suggested idea..
Same noise, just much louder in this application..
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Conclusive result on the gt2056. Not a good turbo for my application. Spools quite fast (faster than a t3), but hits surge at about 3800rpm and 16lbs of boost.
For clarity as to what I put it on, its a 2nd overbore 1.6l hydraulic TD block, ceramic coated crowns, moly coated skirts, 3" dp to a 2.5" straightpipe exh, cranked up pump, 1.9l head ported, ALH intake manifold, large front mount IC, 2" hotside charge pipe, 2.5" coldside charge pipe,a bunch of other stuff.... in a scirocco.
So that is what I have and this turbo does NOT work well with my application. :(
First of all, thanks for sharing your results, posts like this gives so much value!
Secondly, I've double checked the compressor map of your turbo (http://turbobygarrett.com/turbobygarrett/catelog/Turbochargers/GT20/GT2056_751578_2.htm) and compared it to how it performed:
For it to hit surge at around 38000rpm would predict a volumetric efficiency of 65-70%, I thought (and hoped) a ported AAZ head would perform better but your results show us otherwise.
A VNT turbo would give you the added benefit of controlling spool and therefore being able to avvoid surge when a (too) big turbo is used, but that is IF you are able to controll the VNT mechanism properly...
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hey, its best to offer what you have observed than not say anything at all right? :)
One thing to note that I saw I didnt mention, the cam has been swapped with an ALH unit. After finding the problem in my other thread, I wonder if its possible that I have changed so many things that I might be missing something. The ALH cam is very evident with its lack of overlap. It is visible to the eye by comparison with the AAZ cam... perhaps that is something that contributes? If anyone else thinks this might be a source of the surging, I have no problem swapping the cams out.. Just trying to avoid another turbo purchase ;)
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The cam would indeed affect the volumetric efficiency, how much an to what degree, I don't know, give it a shot ;)
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I'm hoping you give the cam swap a try. You've peeked my interest as well!
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Changed the cam. Surging is gone. Turbo is still a little laggy so I am going to mess with the pump a bit and see what I can come up with. 25psi @5700rpm
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That's great news :) How much is your governor modded?
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Shimmed 6 or 7 mm. I dont remember cause its been so long! Lol!
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i was going to mention tdi cams are not as good as 1.6 or 1.9 cams, actually for tdi people 1.6 and 1.9 cams would be a cheap upgrade from what i understand, looks like ur work backs up this idea.
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also this is very exciting, can't wait to hear more, would love to see an in car movie as well. i would think you should be able to get more boost sooner, its a bb turbine and all right.
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Journal bearing :( My GTD lost 5th this morning on the way in to work, so I probably will have a video or 5 ;) I record all of my commutes via dash-cellphone cam. I'll see if I can post one tonight when I get home.
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question: why do you record your commutes
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Two reasons:
1. about 7 months ago, there was a bunch of construction on the freeway and they had ground the pavement down. They didnt clean it and my car and I entered into a gravel storm where they were working. Called the contruction company to see if they would pay for my headlights that now had holes in them and they told me that since I could not PROVE there was a gravel storm (thrown up from other cars) that it didnt happen. They denied my claim and I am out of pocket $250.
2. so I can record morons and their license plate numbers and put it on the internets ;)
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sounds fun ;D
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Wow, hard to believe the cam made that much of a difference! Sharing your findings is so valuable to the rest of us. Thank you!
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i was going to mention tdi cams are not as good as 1.6 or 1.9 cams, actually for tdi people 1.6 and 1.9 cams would be a cheap upgrade from what i understand, looks like ur work backs up this idea.
AAZ in TDI is a debatable concept. From what i've gleamed from the forums is if your cam is perfectly timed there is a zero valve clearance degree according to some. Others have actually seen valve piston contact evidence. I chickened out on my build & pulled the AAZ cam I originally planned in my mtdi.
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Wow, hard to believe the cam made that much of a difference! Sharing your findings is so valuable to the rest of us. Thank you!
No prob. I have to admit I was rather skeptical myself. I did measure both cams when they were out. Base circle was the same between both and the AAZ cam had .5mm more lift. Take that for what its worth. I think the change in duration was the biggest factor. I drove it home tonight (GTD broken :( ) and it felt more laggy than with the AAZ cam. However, it does get to 25psi at high rpm. The wastegate has since been disconnected again. So i am not sure what to make of that. Like I said before, I need to fiddle with the pump and see what comes of that... I built the motor for 35psi+ so I am still not satisfied. After LOTS of reading I see stories from people about wheelspin in second and sometimes third, but maybe its the wheel/tire combo. The car has 205/45/16's (iirc) and the only time I get wheelspin is up a hill in 1st after driving through a puddle LOL! I am contemplating putting the gt2560r back on just to see what it does...
I have no video of my commute. I honestly did try, but the windshield is dirty and my suction cup mount did no want to cooperate. I tried to ask the dog to hold the phone, but that didnt work out at all!
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i was going to mention tdi cams are not as good as 1.6 or 1.9 cams, actually for tdi people 1.6 and 1.9 cams would be a cheap upgrade from what i understand, looks like ur work backs up this idea.
AAZ in TDI is a debatable concept. From what i've gleamed from the forums is if your cam is perfectly timed there is a zero valve clearance degree according to some. Others have actually seen valve piston contact evidence. I chickened out on my build & pulled the AAZ cam I originally planned in my mtdi.
Very interesting. Although my Scirocco is not a TDI (for now), you have me curious. One would think that interference would be evident during the checking stage (rotate engine by hand twice before running). I wonder if its possible that those engines in question had previous contact before and attributed it to the cam swap...
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False positive on my part about the cam idea. I decided to find out why it was so laggy today. Well, because I am stupid and keep messing with too many things at once and not writing it down, I found that after I had shimmed the wastegate so it wasnt binding to keep me at 15psi, it had once again held it open a little. There is a little light to it though, surging starts at 18-20psi now instead of 15-16psi.
As was mentioned before about fueling, I cranked this little pump up until there is no more fuel for it to deliver. Still surges. Although I dont quite understand how more fuel could help with the surging. :confused:
:(
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Do you have a port of some kind on your exhaust manifold? It would be interesting to hook up a gauge to measure exhaust manifold pressure and how that pressure compares to the surging if at all.
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I have a port for a pyrometer. I also have a backpressure guage. I think the EGT probe hole might be a little small though? I am down to offer my time for testing.. i will make sure to document each change.. promise :P
edit: I might also add that the DP is 3" and the rest is 2.5" with no muffler or any sort of resonator... sounds pretty neat ;)
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surging starts at 18-20psi now instead of 15-16psi.
What's the rpms when you hit surge?
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3900
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Surge at 3800rpm/16psi before and now 3900rpm/18-20psi. Does it give that much more boost now with only 100rpms extra?
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Well, I did change the cam out. So maybe thats it? Still kinda sucks as I am about 10psi below what the goal was. Ive been looking at a 2052-3 lately but from what I am seeing is that higher up inthe RPM range (5300-) its past the choke line. Perhaps I am entering the wrong criteria? I have been using http://www.squirrelpf.com/turbocalc/ for plotting.
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Volumetric efficiency has improved since changing the cam, from 65% to 70% now. Is it a DIY porting job? A GT2056 could work better, but with a lower trim than the 55 trim compressor you have now. The GTB2056VL that Volvo and Alfa Romeo uses has a 50 trim wheel, but they are both VNT. Or the other option is to increase your VE, better porting, bigger valves maybe, better seat cuts, better camshaft etc.
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when i use squirrel i do 18-22:1 a/f ratio with a .36 bfsc, i usually put the ve down to 85 for all rpms, and this seems to match daves dyno with the turbo he used so i figure it must be somewhat accurate
and when i do a 1.6 with gt2056 i get surging around 22 psi, so not too far off from what u have.
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when i use squirrel i do 18:1 a/f ratio with a .36 bfsc, i usually put the ve down to 85 for all rpms, and this seems to match daves dyno with the turbo he used so i figure it must be somewhat accurate haha
VE=85% is pretty optimistic for an 8V, even a good ported Franken one.
vanagonturbo's example over here proves a VE around 70% in the region of 4000rpm
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http://www.vwdiesel.net/forum/index.php?topic=8073.0
thread about surge and it shows daves old compressor housing
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Volumetric efficiency has improved since changing the cam, from 65% to 70% now. Is it a DIY porting job? A GT2056 could work better, but with a lower trim than the 55 trim compressor you have now. The GTB2056VL that Volvo and Alfa Romeo uses has a 50 trim wheel, but they are both VNT. Or the other option is to increase your VE, better porting, bigger valves maybe, better seat cuts, better camshaft etc.
It is a DIY porting job. I mostly gasket matched and opened it up a bit. I didnt get too crazy because I have heard horror stories of going too deep and ruining the head. Perhaps a PD150 intake might be in order. I cant really fit a gasser intake on there due to clearance with the turbo. Although you mention the 50trim being VNT, doesnt that only affect the turbine side? Does the 50 trim work on this turbo? I think the Jeep uses the same VTN 2056 also. I would like to avoid taking the motor apart again... Just looking for a good solution here. :(
Thanks for all the input. Sorry to hijack the thread, but I hope its rather relevant as I have no actual info on this forum regarding this turbo using the search...
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http://www.vwdiesel.net/forum/index.php?topic=8073.0
thread about surge and it shows daves old compressor housing
Assuming Dave is hillfolk'er? After reading that thread, it sounds like he just kept it in surge until the shaft snapped and spit the turbine wheel. Is that DP actually as thin as it looks in the pic??
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no daves compressor housing is the one that was drilled out for surge protection, he built a 190whp mk2 jetta with 1.6 bottom and 1.9 head. with a 50 trim to4e/t3 turbine, dave also had major surge issues which he resolved by just drilling those holes. hillfolk actually did the opposite, he has a tdi-m that he would run 1.6td t3 and k24 turbos on, and hed run them way past the choke limit at over 40 psi with very high egt temps.
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Interesting. They probably dont make an antisurge housing for the 2056 huh? I am a little hesitant to start drilling holes in the compressor housing. How would one go about determining how many holes and what diameter?
Why did hillfolk run those turbos like that? Doesnt even the T3 go out of efficiency range around 23psi?
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hillfolk did it because it worked ::)... haha and its what he had laying around. later he switched to an hx35 with an hx30 exhaust housing which was too big then went with the t3 off of a mb turbo diesel. all this on a flipped rabbit dual outlet manifold with a custom made t3 turbo adaptor.
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i am still wondering if surge is still the issue, malone ran a gt20, and i went back and was reading over his posts regarding the build, he was hitting 20psi at 2k, i haven't found any posts about surge yet, but he did have a pd150intake
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Well, from Garretts website, there are 4 different GT20s. the maps are pretty radically different between the 2056 and say teh 2052-2. I have messaged Malone on here and on Vortex, but he has not replied. I just asked him what turbo he had. I read a lot about his build, so I thought it would be a good turbo. Granted, I dont have the PD intake but is it possible that just an intake manifold could make that much of a difference?
I have been driving it for the past couple of days and it drives ok. Really smooth powerband. I just watch to make sure I dont get to 18psi... Just while the GTD is under the knife getting the trans rebuild and diff upgrade.
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i know it was from the upsolute stage 3 kit but i don't know which one that kit had haha
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Yeah, I saw that as well. at some point during my searching, I seem to recall it was a 2052. Not sure which version though..
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yeah i could find people discussing a 2052, but they were never specific on which one, and whether or not that was the on that came in the kit
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I bet its the 2052-3 ;)
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Alcaid, do you have an opinion on the 2052-3?
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A little more poking around on squirrelperf and I got this:
(http://www.squirrelpf.com/turbocalc/graph.php?version=4&pr0=1&pr1=1.07&pr2=2.1&pr3=3.12&pr4=3.12&pr5=3.12&pr6=3.12&pr7=3.12&airflow0=0.01&airflow1=0.031&airflow2=0.068&airflow3=0.11&airflow4=0.133&airflow5=0.152&airflow6=0.161&airflow7=0.168&product_id=120)
This is with inputs of 70% efficiency across the board, max hp 200, sea level, max rpm 6k, 1.6l, target AF 19, bsfc .35, max boost at 3800 and min boost at 3000. Does anyone see anything wrong with my numbers?
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For reference, here is the same criteria plotted with the 2056.
(http://www.squirrelpf.com/turbocalc/graph.php?version=4&pr0=1&pr1=1.07&pr2=2.1&pr3=3.12&pr4=3.12&pr5=3.12&pr6=3.12&pr7=3.12&airflow0=1.4&airflow1=4.6&airflow2=9.9&airflow3=16.1&airflow4=19.4&airflow5=22.2&airflow6=23.6&airflow7=24.5&product_id=24)
This seems congruent with my findings. Feel free to add any corrections..
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The only number that seems funky to me there is the min boost at 3000rpm... you should be well spooled by then. It probably doesn't make much of a difference, I think it just means you'll be further into surging territory at moderate rpm levels
With the K14 map, however, it hasn't plotted everything because you're WAY above the map's pressure ratio. The top of the K14 map is about 2.6, but with the numbers you gave returned a pressure ratio of about 3.2, or 32psi. Too much for a K14. The annoying thing is that the flow (~.15m^3/s) is just about right.
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Alcaid, do you have an opinion on the 2052-3?
20lb/min of air is too wimpy ;)
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The only number that seems funky to me there is the min boost at 3000rpm... you should be well spooled by then. It probably doesn't make much of a difference, I think it just means you'll be further into surging territory at moderate rpm levels
With the K14 map, however, it hasn't plotted everything because you're WAY above the map's pressure ratio. The top of the K14 map is about 2.6, but with the numbers you gave returned a pressure ratio of about 3.2, or 32psi. Too much for a K14. The annoying thing is that the flow (~.15m^3/s) is just about right.
gotcha! thanks for pointing that out. Stupid me wasnt actually looking at the PR numbers, just the graph..
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Alcaid, do you have an opinion on the 2052-3?
20lb/min of air is too wimpy ;)
Agreed! ;) Is this the part where we come to the conclusion that the efficiency of the motor does not allow for 35+psi on one turbo without going into surge, getting out of the efficiency range of the turbo, or going over the choke line?
One would think it would be possible... but its not looking so optimistic at this point.
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i've read over this (http://www.vwdiesel.net/forum/index.php?topic=2434.0) a few times its 6 years old, passenger performance went on to build the 190whp car that surged like a ***, but they basically conclude the same things, these engines are too small, to flow alot of air that way, have too small and not enough valves to flow alot of air that way, and don't rev high enough to flow a lot of air that way, we're stuck in a little box. its almost like u need an aaz and to rev the *** out of it in order to make any real power. or just compound turbos...
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:( Ok, well I guess for now, I will put an MBC on the 2056 and work on a compound setup.. I have not really been capable of WOT pulls as the 2056 spools pretty quickly and I have to let off the throttle when I see it nearing 20psi. I have read that thread many times. One thing that I keep finding in this forum are threads that start off with fantastic builds and big numbers, but one click to the last page always results in engine failure of one sort or another...
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Hey, I've got no failures yet or to speak of. :-\. That might change at the dyno on Saturday though.
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I've been watching your thread. ;) fingers crossed for no bad things ;) you are using N20 though, so....
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Well, once at the dyno. Hopefully, if they have time, being that there is over twenty trucks participating, they will let me run the first with just the pump to get a baseline pull, then use the N02 with an .024 jet and the third pull let me change it out for the .042 jet.
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Cant wait to see the results! ;D
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Some of the goodies they are giving away is a $700 Snowproformance water/meth kit. I sure could use it.
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Found some more info on the GT20 that Malone used back in the days:
http://forums.tdiclub.com/showthread.php?t=314924
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i doubt anyones going to be cutting into their compressor housing, but here is a nice article.
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i think you might have forgotten something.... :P
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i think you might have forgotten something.... :P
haha
http://www.turbobygarrett.com/turbobygarrett/tech_center/turbo_tech103.html (http://www.turbobygarrett.com/turbobygarrett/tech_center/turbo_tech103.html)
but this is mostly what i wanted show, the comparison of a compressor with surge protection, compared to the same compressor with out
(http://www.turbobygarrett.com/turbobygarrett/images/tech_center/tech_103/enlarged_Images/fig3_enlarged.gif)
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and it says ported housing, but they mean that it has the extra surge protection ports, not that its opened up
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i read over this one a while ago, but still a good thing to post in this thread
http://www.turbobygarrett.com/turbobygarrett/tech_center/diesel_tech.html (http://www.turbobygarrett.com/turbobygarrett/tech_center/diesel_tech.html)
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http://www.turbobygarrett.com/turbobygarrett/tech_center/turbo_tech103.html (http://www.turbobygarrett.com/turbobygarrett/tech_center/turbo_tech103.html)
but this is mostly what i wanted show, the comparison of a compressor with surge protection, compared to the same compressor with out
(http://www.turbobygarrett.com/turbobygarrett/images/tech_center/tech_103/enlarged_Images/fig3_enlarged.gif)
thanks for adding that ;) so in summation, it looks like its possible to make the 2056 work depending on the amount of 'porting' done to compressor housing. Garrett does not offer an anti surge compressor housing for this turbo, so it would need to be custom. Any guess on hole diameter or how many holes? How would one calculate that? From the map that I plotted before, it looks like creating my own anti surge housing might work quite well as the compressor goes back into operating range at higher engine rpms..
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i think its possible too, dave did it with his to4e and that turbo is way into surge unlike your car which eventually comes back in to efficiency
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here is how they work, but who knows if there is even enough meat on the 2056 housing to do that. if u do a google search u can see how alot of companys make the anti surge housings, but man u really need some nards to go drilling in to a brand new expensive compressor housing
(http://www.turbobygarrett.com/turbobygarrett/images/tech_center/tech_103/enlarged_Images/Fig2_enlarges.gif)
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im curious about the mercedes turbo, they are 50 trim t3's right? looks like a good turbo but maybe a bit over spun in higher rpms at 30psi?
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i have created a list using squirrels calculator of turbos which compressors look some what fitting for a 1.6, hx30 compressor actually seems good but only for lower boost numbers. what does everyone else think of these?
td04hl-19t
td05-14b
td05-16g
td05-18g
k6-2 (not the amd processor i used to have one over clocked and *** back in the day when they were a good processor)
hx30
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i have created a list using squirrels calculator of turbos which compressors look some what fitting for a 1.6, hx30 compressor actually seems good but only for lower boost numbers. what does everyone else think of these?
td04hl-19t
td05-14b
td05-16g
td05-18g
k6-2 (not the amd processor i used to have one over clocked and *** back in the day when they were a good processor)
hx30
Problem is, you can't just look at the compressor side. Turbines meant for petrol or large displacement diesels are not gonna work on a 1.6/1.9td...
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yes i realize that, but most turbos are in a family of turbos with many compatible parts
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The TD04-13t-4 might work OK. Used on a 2.5litre 143hp IDI (BMW 525TDS), so should support a 160-170hp IDI if it can give you enough PR to get a Franken to that kind of power levels. Spool would be slower than on the BMW, but should be reasonable especially if gov.modded ;)
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yeah that turbo is the best one of the bunch certainly. the best thing would be to make a compound setup, maybe a ko3 off a tdi compounded with one of these:
surging could be an issue
(http://media.photobucket.com/image/recent/ellsburger/bigassturbo.jpg)
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You forgot something again :P
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You forgot something again :P
Dang... anyone have a compressor map for that?
(http://img.photobucket.com/albums/v434/ellsburger/bigassturbo.jpg)
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i see what i did wrong there
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does anyone know much about surge tanks? where you add volume say twice the volume of the engine to the intake in order to prevent surge. this was something they did on turbo charged v twin motor cycles because the intake valve is shut for such a long time between the 2 cylinders that the air really had no where to go.
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the more i think of it, i do not think this will help to prevent the surge that we fight with a low flow, low rev, low displacement engine, the surge tank would only really help in the v twin situation between intake strokes of the 2 engines.
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It appears that the k26-2 will spool the quickest. Alcaid, what do you think about the lag on the td04h-13t?
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A stupid though, but a thought still... what about using a BOV? Something that can be calibrated to exhaust extra pressure when the differential is too high but not exhaust pressure when things are going as they should.. what do you guys think about that?
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Sounds like a great idea.
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I was thinking an EBC to operate the BOV. Not sure if the EBC would take a w terminal signal feed though. that would be the easy idea. If not, a circuit could be fairly easily designed..
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kinda wanted to revive this and discuss some of the new turbos again... i think gt2056 is still a good option for a 1.6td assuming there is good flow in the head and intake manifold surging issues should be minimal
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Any news on the GT2056?