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#15
by
VW_Commuter
on 09 Oct, 2008 09:30
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I think part of the issue with the smaller turbos is that they have to work so hard to compress the air while the larger turbos don't have to work as hard as they are compressing more air in a single rotation versus the smaller turbo.
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#16
by
Jet A
on 11 Oct, 2008 21:14
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Air does heat up when compressed. But the amount of heat it generates in the cylinder compared to the combustion of fuel is next to nil.
While this is true, your air density is lower. when you lower your air density your increasing your egts, due to a rich mixture. thats why you intercool. Its not about quanitity of air, its about quality.
Oh ya, "Whats TO HOT?"
In my Cummins I would hit 1800 under WOT often :shock:
Your poor cummins should have melted to the ground!. 1650 max for no more than 3sec. Your valve seals are gunna hate you....12v or 24?
Back to the vw. I am hoping all of these numbers being thrown around are thermocouples mounted between the turbo and the head. With that said. these measurements are an average of all cylinders. you could actually be running hotter in one cylinder than another. I am not taking my ceramic coated pistons higher than 1400 intermittent. and 1150 sustained. Of course the water/meth will kick in at 1200.
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#17
by
hamradio
on 13 Oct, 2008 20:05
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655*F.
That's if it's floored, 5th gear, up a hill.
Specs-
1.6NA converted to TD
VNT15 from a TDI
NA injectors
NA pump
Fuel screw cranked as far as the crimped on collar would permit
11psi
No intercooler
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#18
by
zukgod1
on 14 Oct, 2008 06:59
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Oh ya, "Whats TO HOT?"
In my Cummins I would hit 1800 under WOT often :shock:
Your poor cummins should have melted to the ground!. 1650 max for no more than 3sec. Your valve seals are gunna hate you....12v or 24?
Gee thanks.
The Cummins is a VERY durable engine. When it did touch 1850 that's when I backed out. Those were very hard pulls with the rock crawler behind me going up steep hills between home and Moab. To much fuel not enough timing.
I pulled the head after 145k to O Ring it due to the 50+ psi I was pushing and it looked perfect. Ended up reassembled with a OE gasket and ARP's.
Sold it about 50k later still running strong.
Cummins and VW cannot be compaired.
BTW 1650 is for ***'s!
My 1.6 has seen 1650..
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#19
by
Jet A
on 14 Oct, 2008 08:48
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Oh ya, "Whats TO HOT?"
In my Cummins I would hit 1800 under WOT often :shock:
Your poor cummins should have melted to the ground!. 1650 max for no more than 3sec. Your valve seals are gunna hate you....12v or 24?
Gee thanks.
The Cummins is a VERY durable engine. When it did touch 1850 that's when I backed out. Those were very hard pulls with the rock crawler behind me going up steep hills between home and Moab. To much fuel not enough timing.
I pulled the head after 145k to O Ring it due to the 50+ psi I was pushing and it looked perfect. Ended up reassembled with a OE gasket and ARP's.
Sold it about 50k later still running strong.
Cummins and VW cannot be compaired.
BTW 1650 is for ***'s!
My 1.6 has seen 1650..
HAHA, go over to diesel truck resource and tell them that....but dont tell them where you live.
I am a cummins believer...im in the 600's club. and we have all had our 1800degree moment.... :oops:
You must have been a 12v if your oringing at 50...correct? or pre common rail 24valve?
Im a ***....i get scared at 1500...! to much money to replace that motor. id much rather spend on mods to keep it cool. like a set of twins perhaps :twisted:
Knowing what i know about these (vw) motors.....i aint gunna get it that hot...
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#20
by
arb
on 14 Oct, 2008 09:15
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1850 ? I'm guessing either your turbine was not spun fully up, or your EGT was a little off - the wheel can't be spun at full speed and that temp w/o causing damage to the exhaust turbine wheel.
Or, do you have an after market wheel that's a super alloy ?
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#21
by
zukgod1
on 14 Oct, 2008 10:35
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Oh ya, "Whats TO HOT?"
In my Cummins I would hit 1800 under WOT often :shock:
Your poor cummins should have melted to the ground!. 1650 max for no more than 3sec. Your valve seals are gunna hate you....12v or 24?
Gee thanks.
The Cummins is a VERY durable engine. When it did touch 1850 that's when I backed out. Those were very hard pulls with the rock crawler behind me going up steep hills between home and Moab. To much fuel not enough timing.
I pulled the head after 145k to O Ring it due to the 50+ psi I was pushing and it looked perfect. Ended up reassembled with a OE gasket and ARP's.
Sold it about 50k later still running strong.
Cummins and VW cannot be compaired.
BTW 1650 is for ***'s!
My 1.6 has seen 1650..
HAHA, go over to diesel truck resource and tell them that....but dont tell them where you live.
I am a cummins believer...im in the 600's club. and we have all had our 1800degree moment.... :oops:
You must have been a 12v if your oringing at 50...correct? or pre common rail 24valve?
Im a ***....i get scared at 1500...! to much money to replace that motor. id much rather spend on mods to keep it cool. like a set of twins perhaps :twisted:
Knowing what i know about these (vw) motors.....i aint gunna get it that hot...
It'a all in fun..
I hear ya on the EGT's for sure.
It was a 24v but pre common rail and to be honest instead of poking the bee's nest I only hit it a couple times when I wasnt paying attention pulling my rock crawler heading to Moab. Scrared the shiz out of me both times. I even pulled over and let it idle down to 600 before I even lifted the hood. makes my hands sweat just hinking about it..
Oh ya. Only ***'s hang out at DTR :twisted: CompD http://www.competitiondiesel.com/ is the only place to be 
Just messing with ya man...
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#22
by
zukgod1
on 14 Oct, 2008 10:38
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1850 ? I'm guessing either your turbine was not spun fully up, or your EGT was a little off - the wheel can't be spun at full speed and that temp w/o causing damage to the exhaust turbine wheel.
Or, do you have an after market wheel that's a super alloy ?
I had a proto type turbo from Hightech turbo on it at that time.
Once we changed out the turbo it never went past 1650 again.
It just wouldn't lite to save it's ass and when it did I was already out of it. just to damn big.
Ended up with a 64/14 SS housing for towing. 150 sticks, Redline/Smarty.
Sure was a fun truck but so is the VW and it's easier to work on, oh ya. The VW is paid for as well.
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#23
by
Jet A
on 14 Oct, 2008 11:29
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1850 ? I'm guessing either your turbine was not spun fully up, or your EGT was a little off - the wheel can't be spun at full speed and that temp w/o causing damage to the exhaust turbine wheel.
Or, do you have an after market wheel that's a super alloy ?
If you cant spool the turbo, those motors (or any for that matter) get pissed...quick! but when they lite....OMG its like being in a cannon, trailer or not.
Inconel will handle that, but notice were talking seconds. Seems like most turbines are inconel or some derivitive...i could be wrong
Zukgod....were you playing with the golden nugget (66/71/16)? ***s cant spool the golden nuget!! :twisted: :? J/P
Comparing IDI temps to DI is probably not a good idea. I wonder which is hotter precup temps or combustion temps. where is the majority of the burn? also, which is the hottest cylinder? #4s my guess.
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#24
by
zukgod1
on 14 Oct, 2008 13:10
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Zukgod....were you playing with the golden nugget (66/71/16)? ***s cant spool the golden nuget!! :twisted: :? J/P
DAMN!!
Ya caught me! :twisted:
I needed more mods to get that thing spinning, Once it lite it was down right scary.
I was running 38" Toyo's and it was hard to keep them planted one it did lite... :shock:
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#25
by
Baxter
on 16 Oct, 2008 15:18
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VW T3 Westfalia (Vanagon Camper)
1.9TD AAZ with barrel charge cooler and hybrid turbo.
No governor mod.
Stock injection system with Rover boost pin.
1.25 bar under load - .5 bar cruising.
EGT 650°F cruising on flat
EGT 1100°F nailling it up hill
Thats boost and fuel backed off from stock!
It went like *** off a stick when I first built it, then I checked the boost gauge - 2 bar (30psi) I soon backed it off a bit!!
:shock:
It also ran really hot, smelt hot and revved it's nads off at idle!
S'okay now tho..
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#26
by
zozep
on 30 Oct, 2008 04:57
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1.6td
Giles pump - fueling set for 20psi
K24
ARP studs
1.9l HG
Cheap ass injectors
no IC yet, but I just got a little SMIC from a G60
Usually sits anywhere between 6-800 when cruising...
1-3 WOT @15psi max will hit 1600 if I let it. Although i've never sustained that for more than 2 seconds.
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#27
by
VW Fox
on 30 Oct, 2008 06:31
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What's a safe range for post-turbo EGTs? The probe in my Dasher is about 10cm from the turbo in a 2.5" downpipe.
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#28
by
zukgod1
on 30 Oct, 2008 06:50
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What's a safe range for post-turbo EGTs? The probe in my Dasher is about 10cm from the turbo in a 2.5" downpipe.
Generally you want to add at least 400deg to a post turbo reading.
That # will increase the further away from the turbo you get.
Post turbo is just not a good place to read EGT's unless all you want is a gauge to move around.
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#29
by
zozep
on 30 Oct, 2008 08:51
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So i've heard people say never to go above 1600... Is that never go above 1600 sustained? or never go above 1600 period? I'm pretty sure i've hit 1600, never for longer than a second though... but my jaunts to 100kmph WOT usually get me to 1450-1500 range... Whats safe?