Originally Posted by ashtonsser 
i was running a 12.3-5:1 when i had my t25, s4 cam setup on 8psi it was powerful enough to run a 13.0@110 on street tires. But i will say upping the boost on the t25 over 12psi and adding the added heat and backpressure which also keeps heat in the cylinders did not end well at all for the motor.
So yeah many people told me i needed to be 11.3:1-11.6:1 to be optimum on pump gas. With race fuel you can go into the upper 11's. My setup now is held steady at 11.8:1 or so accross the board on 110 octane race fuel. I had no detonation no misfires no melting plugs and you know what ill stay right there where im at cuz i know the tune is good. Ive had bad experiences with running leaner than 11.8:1 and i wont do it again, Dont even say its was a timing issue, Yes it was an issue with overboosting but it was also an issue of being too lean.
This is one of those circumstances where when its running soo strong you know something is gonna go wrong. With volumetric efficiency in an engine comes heat with heat comes detonation. You can be less effecient and make less heat and be safe making a little bit less or you can push the limits which ive done several times and found out the hard way its not always best. And again to those in my other threads saying timing issue, no way, 13-14 deg base timing is plenty of leway. Its a plain and simple fact that i was being as efficient as possible but again with that comes problems. It leaves no room for error
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