Author Topic: 81 Rabbit LS AAZ (2023: now tdi-m)  (Read 48868 times)

Reply #60June 27, 2016, 08:27:29 pm

theman53

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Re: 81 Rabbit LS AAZ
« Reply #60 on: June 27, 2016, 08:27:29 pm »
Cool.

Build a box around that air cleaner to keep the engine heat away.

Reply #61June 28, 2016, 08:46:25 am

RabbitJockey

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Re: 81 Rabbit LS AAZ
« Reply #61 on: June 28, 2016, 08:46:25 am »
Well there's not really enough room, or enough will on my part to do that haha.  The ac lines are right under it, just adding the stock intake with the cone filter actually made it run a lot better, a very noticeable increase on the butt dyno.  I found another problem last night though, there is an exhaust leak on cylinder 1 exhaust manifold gasket, but I'll fix that this weekend.
01 Jetta TDI 100% stock daily
81 Rabbit:TDI-M ported head, Frank06 cam, PD intake, hybrid T3 turbo, Renault intercooler, Syl20 11mm pump, light weight fw, and yellow California Clutch clutch kit

Reply #62July 01, 2016, 08:13:52 am

RabbitJockey

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Re: 81 Rabbit LS AAZ
« Reply #62 on: July 01, 2016, 08:13:52 am »
I bought a gtech which arrived last night, once i have the software and stuff figured out i will post dyno graphs.  I only did two 1/4mile, 16.5 was the best of the two, but that one had a slower 0-60, the fastest 0-60 is 8.25.  Not particularly exciting, most cars are that fast.  the interesting thing for me is that this is at only 8psi with no intercooler.  on my other car long ago i also ran a 16.5, but that was with a 1.6td with a k24 and a cranked stock pump and 30psi.  so this car is faster with a quarter of the boost.  i will be increasing boost and playing with fueling and recording all of that with the gtech.  i will also swap from my t3 hybrid to a k14 and compare all the numbers.

01 Jetta TDI 100% stock daily
81 Rabbit:TDI-M ported head, Frank06 cam, PD intake, hybrid T3 turbo, Renault intercooler, Syl20 11mm pump, light weight fw, and yellow California Clutch clutch kit

Reply #63July 05, 2016, 12:38:52 am

vanbcguy

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Re: 81 Rabbit LS AAZ
« Reply #63 on: July 05, 2016, 12:38:52 am »
30 PSI is more than a K24 can provide with any sort of efficiency. Remember it takes pressure to make pressure and the K24 compressor is only 75% efficient or so in its sweet spot, probably more like 50% at 30 PSI. Running overly high boost is like running a really restrictive exhaust, you WANT there to be plenty of exhaust flowing through the wastegate rather than through the turbine.

Having the G-Tech will be a lot of fun and will definitely help quantify the tuning changes you're making. Sounds like fun!

Sent from my XT1097 using Tapatalk

Bryn

1994 Jetta - AHU M-TDI - Jezebel Jetta
2004 Jetta Wagon - 1.8T - Blitzen

Reply #64July 05, 2016, 07:37:13 am

RabbitJockey

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Re: 81 Rabbit LS AAZ
« Reply #64 on: July 05, 2016, 07:37:13 am »
oh yes i agree, especially the k24(vs t3) is not good for that much boost, this highlights the importance of using more efficient(sometimes bigger) turbos, and the importance of higher rpm performance through a performance injection pump.  the larger displacement of my aaz is definitely not the main factor in having a car which is just as fast at 1/4 of the boost.  although honestly at 8psi, i think the car would probably be faster with the original k14 that came on the aaz, and i will experiment with that, it is not much work to switch from t3 to k14.
01 Jetta TDI 100% stock daily
81 Rabbit:TDI-M ported head, Frank06 cam, PD intake, hybrid T3 turbo, Renault intercooler, Syl20 11mm pump, light weight fw, and yellow California Clutch clutch kit

Reply #65July 19, 2016, 12:02:37 pm

RabbitJockey

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Re: 81 Rabbit LS AAZ
« Reply #65 on: July 19, 2016, 12:02:37 pm »
I installed a boost controller and set the boost up for 15psi, it is a much better driving car in every way.  It runs cooler and the turbo is much more responsive, and even off boost the engine smokes much less.  It's also much faster, i'll try and get some gtech numbers soon.
01 Jetta TDI 100% stock daily
81 Rabbit:TDI-M ported head, Frank06 cam, PD intake, hybrid T3 turbo, Renault intercooler, Syl20 11mm pump, light weight fw, and yellow California Clutch clutch kit

Reply #66July 22, 2016, 02:47:38 pm

RabbitJockey

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Re: 81 Rabbit LS AAZ
« Reply #66 on: July 22, 2016, 02:47:38 pm »
with the boost controller creeping to nearly 20psi (how ever emps never over 25psi) and also egts which will exceed 1300 degrees on a long i went and did a few dynos, im still getting used to the gtech, i don't like this unit, it does not do a very good job at scaling rpms, but it says even with the rpms off the peak hp rating will be correct... im guessing the torque numbers are what suffer.  so this run had a peak hp of 130whp @4340, and peak torque of 160ftlbs@4287, there were 2 other runs that i would consider close to accurate, one was 122whp & 140tq, and the other 133whp & 180tq.  these runs were done on the same road in different directions or what ever.

all of the dynographs are shaped like this one with a huge dip in power between 3-4000 rpms, im not sure what the issue is, i think its fueling or something, because theres definitely a dead spot in acceleration then the turbo lights off and goes from 10-20psi instantly and pulls hard to 4500-5k.  but i have a few things im going to check before i speculate and gripe too much on here.

« Last Edit: July 22, 2016, 02:53:18 pm by RabbitJockey »
01 Jetta TDI 100% stock daily
81 Rabbit:TDI-M ported head, Frank06 cam, PD intake, hybrid T3 turbo, Renault intercooler, Syl20 11mm pump, light weight fw, and yellow California Clutch clutch kit

Reply #67July 24, 2016, 07:49:26 pm

theman53

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Re: 81 Rabbit LS AAZ
« Reply #67 on: July 24, 2016, 07:49:26 pm »
how is the LDA spring adjusted? I would start there, interesting either way let us know what it is when you find out.

Reply #68July 25, 2016, 12:58:48 pm

RabbitJockey

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Re: 81 Rabbit LS AAZ
« Reply #68 on: July 25, 2016, 12:58:48 pm »
how is the LDA spring adjusted? I would start there, interesting either way let us know what it is when you find out.

i have removed it and reinstalled it but i didnt mess with an settings, i'll pull it out and make sure its in straight and everything,  but even if it were stuck i wouldn't expect me to lose power, i think it should still keep climbing just not at as fast of a rate.... i was thinking maybe i have the throttle shaft indexed wrong or something and it creates a weird issue when changing over from intermediate to main spring... no idea tho.
01 Jetta TDI 100% stock daily
81 Rabbit:TDI-M ported head, Frank06 cam, PD intake, hybrid T3 turbo, Renault intercooler, Syl20 11mm pump, light weight fw, and yellow California Clutch clutch kit

Reply #69July 25, 2016, 03:12:17 pm

RabbitJockey

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Re: 81 Rabbit LS AAZ
« Reply #69 on: July 25, 2016, 03:12:17 pm »
so far i have checked that my lift pump is not limiting anything, i tapped my in bolt and drove around with a pressure gauge and it holds steady at 5 psi in every condition at every rpm, i was quite impressed actually since it was a cheap ass lift pump.  also if i am leisurely accelerating and i am in second gear and go past 3-3500 some where in there it make a badunk noise almost like a miss but keep on accelerating.
01 Jetta TDI 100% stock daily
81 Rabbit:TDI-M ported head, Frank06 cam, PD intake, hybrid T3 turbo, Renault intercooler, Syl20 11mm pump, light weight fw, and yellow California Clutch clutch kit

Reply #70July 25, 2016, 09:59:01 pm

RabbitJockey

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Re: 81 Rabbit LS AAZ
« Reply #70 on: July 25, 2016, 09:59:01 pm »
spoke with libby:

"Is there any smoke during that dip in power?  The first thing I'd try would be lowering the star wheel.  You can pull the atmospheric bleed filter and run use a flat blade so you can make easy adjustments without pulling the lid and pin each time."

i don't think the car smokes hardly at all anymore, and i really doubt it does during the dip, it really doesn't smoke except off boost slightly before the turbo spools.

as far as the start wheel goes mine is non adjustable, there is no star wheel in this lda

some friends have suggested to check the case pressure relief valve, which i will pull tomorrow i just didn't have time to grind out a 10mm socket tonight.  although i don't think that is the issue since i have the timing set pretty far back at 0.93mm and i thought that would affect higher rpms more than lower or mid range... but i will still check it to eliminate the possibility.



01 Jetta TDI 100% stock daily
81 Rabbit:TDI-M ported head, Frank06 cam, PD intake, hybrid T3 turbo, Renault intercooler, Syl20 11mm pump, light weight fw, and yellow California Clutch clutch kit

Reply #71July 25, 2016, 10:15:06 pm

RabbitJockey

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Re: 81 Rabbit LS AAZ
« Reply #71 on: July 25, 2016, 10:15:06 pm »
01 Jetta TDI 100% stock daily
81 Rabbit:TDI-M ported head, Frank06 cam, PD intake, hybrid T3 turbo, Renault intercooler, Syl20 11mm pump, light weight fw, and yellow California Clutch clutch kit

Reply #72July 25, 2016, 10:53:58 pm

libbydiesel

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Re: 81 Rabbit LS AAZ
« Reply #72 on: July 25, 2016, 10:53:58 pm »
Can you gain more travel for the LDA pin by removing that nylon spacer?  You want to make sure the feeler pin isn't pinched.

Do you have EGT gauge hooked up? 

Reply #73July 26, 2016, 07:20:30 am

RabbitJockey

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Re: 81 Rabbit LS AAZ
« Reply #73 on: July 26, 2016, 07:20:30 am »
yes the nylon washer easily slides off, i hadn't thought of messing with it tho since on boost power seemed to be good

making sure that the pin isn't pinched, do you mean by the o ring or internally?  when i pull the throttle it pushes the pin out easily

yes i have an egt gauge hooked up, if i floor it for a while i can get over 1200 degrees quite easily, but i haven't ever left it get over 1400. 
01 Jetta TDI 100% stock daily
81 Rabbit:TDI-M ported head, Frank06 cam, PD intake, hybrid T3 turbo, Renault intercooler, Syl20 11mm pump, light weight fw, and yellow California Clutch clutch kit

Reply #74July 26, 2016, 02:00:44 pm

libbydiesel

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Re: 81 Rabbit LS AAZ
« Reply #74 on: July 26, 2016, 02:00:44 pm »
By pinching the feeler pin, I was referring to the possibility that the top 'shelf' in the boost pin cutout could push down on the feeler pin if the boost pin is allowed to move that far. 

Have you done the governor mod?  Maybe the governor is starting to cut fuel at 3.5k rpms.