Originally posted by Y2KSVT:
Originally posted by Stazi:
Looks a LOT lean to me. you neve drop below 13:1 really. Needs more fuel!
Good call Stazi. But I thought we could get away with ~13.0:1 - 13.5:1 compression on a N/A application? If not, expect to lose a couple of HP if you decide to fatten the AFR.
Mark
From my experience you will not loose any HP by richening it up to around 13:1
Below that you may stay the same or you may loose a tad, but it is better to be safe. I think 13.5:1 was ok on my car because it seemed rather detonation resistance in low-mid rpm range. However, once it broke 6000-6500 it would sometimes ping when hot so I would richen it back up to about 12.8 to 12.9:1 just for the protection.
You are being held back by your exhaust and intake for sure. Those items on my car made from anywhere from 11 to 23 horsepower, and I dyno'd 196 fWHP with stock SVT intake and exhaust with my SVT hybrid with 3L valves and porting.
Former owner of '99 CSVT - Silver #222/2760
356/334 wHP/TQ at 10psi on pump gas!
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