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**

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Dec 5, 2008, 05:57 AM

#32

detroit pistins

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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.

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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 )

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Dec 5, 2008, 06:26 AM

#34

detroit pistins

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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,

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Dec 5, 2008, 06:28 AM

#35

detroit pistins

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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?

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Dec 5, 2008, 07:10 AM

#36

35rEvo

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

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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.