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#45
by
R.O.R-2.0
on 15 Jul, 2011 10:44
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I've had my N/A to turbo engine up to 1450 F sustained for about 400 miles 
with the only stopping to repair popped boost hoses.
I do have an oil cooler though, and coated pistons, and a metal head gasket, but otherwise it's a stock 1.6 NA engine and NA pump.
I actually hate low laggy the boost is and how much it smokes off of boost. Running about 12 psi which is as much as I can get without turning up the fuel more and making intersections vanish at stoplights. VNT is in my future.
But yeah, tough as hell little engines.
Brendan
my pump is cranked to the max (idle almost hangs, and smokes off boost) and with the VNT i only get smoke for a second, then the turbo lites and off we go.. VNTs are the way of the future..
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#46
by
vdubspeed
on 15 Jul, 2011 18:51
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I WANT more fuel but can't add anymore in or it will rev-hang. HOWEVER...I NEVER see smoke. Not off or on boost.
Nothing like when I was NA. I'm only 1.5 rotations in on my screw but if I go to 2 then it hangs. How are you guys getting so much damn fuel and not hanging?
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#47
by
theman53
on 15 Jul, 2011 19:20
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#48
by
vdubspeed
on 16 Jul, 2011 02:23
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I have done the gov mod. My problem is different than what libby is explaining.
That is for people who turned up their fuel so much they can't bring their idle down. I had that problem in the beginning and followed his advice and have moved the 1 spline.
My problem is I want EVEN MORE fuel. If I try to add any more it's not that I can't get a good idle...it's that when I rev it....it won't ever come back to idle. It pretty much becomes a run away engine.
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#49
by
RabbitJockey
on 16 Jul, 2011 07:19
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i think this is where a td pump would probably help, once u let off the pedal ur losing the drive pressure and thus losing the boost pressure, but still getting too much fuel causing it to hang. on a td pump when u let off the pedal u lose the drive pressure and the boost, and also get fueling cut due to the lack of boost.
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#50
by
rallydiesel
on 16 Jul, 2011 08:48
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I have run at 1500F for several seconds with no apparent ill effects. Has anyone actually melted anything? I have seen pics of built diesel trucks with glowing downpipes and no engine damage. Surely stock gassers must run higher egt's and they don't melt stuff.
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#51
by
rallydiesel
on 16 Jul, 2011 09:50
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What kind of mods was he running?
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#52
by
Powered by Spearco
on 16 Jul, 2011 10:09
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So whats an extreme fuel to air ratio and whats a standard AFR? For diesel that is.
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#53
by
veector
on 16 Jul, 2011 10:24
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I melted a piston in my old tired 1.9 TD running 25lbs of boost and a superpump from giles
it takes alot to melt things, i was going pretty quick with no egt or intercooler and it popped BAD
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#54
by
R.O.R-2.0
on 16 Jul, 2011 11:04
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A friend's:
holy crap.. how did he melt it on the back side? usually the front of the piston is the hot side..
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#55
by
RabbitJockey
on 17 Jul, 2011 08:17
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So whats an extreme fuel to air ratio and whats a standard AFR? For diesel that is.
who knows? haha. ive seen lots of pistons that were starting to melt on the injection side of the piston
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#56
by
lord_verminaard
on 18 Jul, 2011 07:04
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FYI, Audi 2.7 TT gasser engines start to enrich the mixture (making cooler) when egt's get to 950C. (1742 F !!!!!!)
I think what makes diesels more sensitive to high EGT is that our combustion event lasts much longer in comparison. That's the only logical hypothesis that I can come up with anyway.
Brendan