Boost for stock turbo
#2
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Depends on if you have an Evo 8 or Evo 9 turbo.
I have seen spikes as high as 29-30 psi on my evo 8 turbo,but the boost tapers off quickly.
Evo 9 turbos will spike as high or slightly higher but not taper as much.
I have seen spikes as high as 29-30 psi on my evo 8 turbo,but the boost tapers off quickly.
Evo 9 turbos will spike as high or slightly higher but not taper as much.
#7
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We all have supporting mods in order to boost that high. You have to run either e-85, race gas or meth, but I boost to 30psi everyday. I have 110k miles on my stock bottom end and head. Pretty safe IMO.
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#8
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B) He's running E85, essentially race gas.
That's still super high, but I'm sure he has everything in place that he needs for it to be safe. Will the motor last 10 years? I doubt it. But even the cars running 23 psi will last less time than those running factory everything (that's a given).
I ran 21 psi with hardly any taper (down to 19 by redline) on my 8, and I'd crank it up to 25 when I'd throw race gas in (no tune for race gas, this was back before switching maps was easy).
If it makes you feel better we turned up the boost on my STi... I'm running about 15.5 psi most of the power band Was about 12 stock, with a peak around 15 for a few RPMs.
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I'm tuned to 29.5 on the stock non ported turbo with 44k and have spiked as high as 33.5 PSI. I am running e-85 and the highest I have heard on pump 91 was 27 PSI with 650 injectors and Comp 280's.
A buddy of mine drags his stock 9 turbo to spike at 38 PSI and holds at 28-29 PSI
A buddy of mine drags his stock 9 turbo to spike at 38 PSI and holds at 28-29 PSI