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Old 11-17-2020, 09:07 AM
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eschaider eschaider is offline
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Join Date: Feb 2006
Location: Gilroy, CA
Cobra Make, Engine: SPF 2291, Whipple Blown & Injected 4.6
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Quote:
Originally Posted by joyridin' View Post
Without knowing the design very well, 10.3 and a supercharger on 93 pump gas is nothing these days. I have 11.2:1 and run 11 psi with meth injection and have no issues on 93. You could easily run 8-9 psi on pump with that compression. I had 15 psi on my engine with 10.7 and meth/water injection. Finding the right cam would probably be a bigger issue than adding the supercharger.
The reason you can run that boost with your compression is the water/meth injection. That substantially raises the octane of your 93 octane gas so as to prevent detonation. Without the meth injection you would be forced to pull timing to prevent detonation. As you pull timing your engine power output plummets spectacularly offsetting the reason you elected to supercharge in the first place.


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