Originally Posted by benw
Thanks guys. This car did make good torque. His supervisor has a STI and after riding in this WRX, I got a phone call from him asking where he can buy a turboback and retune the car!
Have you found that leaning the car out tends to prevent low to mid load knock? When I first started the fueling, it was around 10.1 at peak torque, and with only 8-9 degrees of advance. the car didn't like it all and would knock here and there. leaning it almost a full point caused that knock to disappear.
I'd go leaner up top, but Oklahoma's pump fuel is notoriously bad. We're also at 1,000 feet elevation so airflow suffers a tad (14.0 psia)
The knock from being too rich with low timing was caused by the extreme EGTs you would see under those conditions. Too rich + low timing = furnace. I haven't seen a 2.0L engine rich knock yet but I have seen 2.5Ls do it on our local 92 at anything richer than 11.3 with a turbo upgrade.
Local fuels play a huge role in what kind of curves you run, my local fuel doesn't like timing even if you richen it up. I run 11.7 AFR at 10 degrees of timing at peak torque and 11.2 and 21 degrees at redline on a Stage 2 WRX.