02SOMSS

iTrader: (10)

I'm ordering springs for my gates, those of you running just 91 pump gas, how much boost are you running?
My combo is:
LQ4 shortblock
LS3 heads
Martin cam
S476r

Eventually I will be adding meth but for now I'd like a bit more than the 8# it's at.

LILHEMI

i run 18 psi with windshield washer fluid in the meth tank and 11* timing. made 750 to the wheels which is how i drive it every day lol you can get away with 14-15 psi with no meth. just keep your a/f fat and timing low.

Old Geezer

iTrader: (3)

W/ intercooler, or not??

02SOMSS

iTrader: (10)

Yes, air to air. Sorry should have mentioned that.

geoff17

I've been running 15-16psi on my lq4 with no meth and its been fine. I do run 93octane though as opposed to your 91

Sales@Tick

iTrader: (3)

Don't limit yourself to a set boost number. Every combo will move more or less airflow for a given boost number based on volumetric efficiency.

Manifold pressure is not 100% indicative of cylinder pressure and shouldn't be used as an absolute for octane requirements.

I'd personally stop around 700 rwhp on straight pump 91. Considering a safe amount of timing is being utilized.

Fast86z

iTrader: (1)

Just know you're playing with fire. Turn it up too high and just a bad tank of gas will pop the engine. For what it's worth I ran 14 psi on pump 93 for a month with multiple track passes. Ran it hard after filling up and it broke doing a burnout behind a grocery store.

Good luck

HRHohio

How about on a forged piston setup?

stock48

iTrader: (17)

Detonation is what kills engines. The same detonation will destroy a forged engine as well; it just takes longer.