What is a safe boost # on stock 4g63?

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Dec 4, 2008 | 10:10 PM

#31

boosted2x2

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26lbs on pump gas no meth for months now{thumbup**

Dec 5, 2008 | 05:57 AM

#32

detroit pistins

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From: Detroit

Quote:

Originally Posted by C6C6CH3vo

The safe boost # on stock 4g63 depends on a list of things:

angle of peak pressure (afr/timing)
octane (duh)
rate of combustion (afr/fuel of choice)
VE (camsettings/cams)
IAT (ducting/cooling)
backpressure
oil pressure/clearance/weight
health of engine

and most of all, your wallet!

LOL i think with a healthy wallet u can run anything.

Dec 5, 2008 | 06:02 AM

#33

condi

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I would say you would be safe in the 20'ish , depends on your tune. but it also depends on you engine's health ( as say'd before )

Dec 5, 2008 | 06:26 AM

#34

detroit pistins

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From: Detroit

ya the engine is in top condition, still has 17k miles on it and i change the oil every 3k miles. so iam thinking of getting it flashed and jack up the boost to 22psi on 93 octane, just to be safe.
thanks,

Dec 5, 2008 | 06:28 AM

#35

detroit pistins

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From: Detroit

Quote:

Originally Posted by apeximprt2nr

stock internals with a 35r I ran 22psi with an afc tune and had no problem

how much power are u gainning with the 35r @ 22 psi?

Dec 5, 2008 | 07:10 AM

#36

35rEvo

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One question....Who will be tuning your car?

Dec 5, 2008 | 07:55 AM

#37

sparky

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The IX´s MIVEC head is less knock sensitive than the VIII cylinder head. Thus, the Evo IX´s can safely be tuned to run a couple PSI more boost than the Evo VIII´s can on any given octane level of gasoline. Do you have an VIII or a IX, OP?

Last edited by sparky; Dec 5, 2008 at 08:08 AM.