TD is love, TD is life
Join Date: Apr 2004
Location: Mesa, AZ.
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Re: 350whp at 6250 rpm
Honestly, I don't remember.
Fuel is adjusted first to the optimal setting which is depended on the fuel type and RPM, then timing is added until there is no more HP gain, then you back off timing until at no HP gain point, then add more boost, then rinse and repeat. Knock sensor isn't really used in this process as I was told by the dyno tuner that if there is knock, you'll see sudden lost of power on the dyno.
My street tune was a very conservative tune.
First dyno out of the box I did was at 9psi then slowly creep to 13psi, I was surprised it made 250whp. The cam timing was 2 degree advanced, I retarded it to 2 degree retard. The peak HP number didn't change, but the retard did slow down the rapid torque drop off after after peak HP and gained 20hp at the 7000rpm point and we stopped there with the cam timing. That is the redline dyno on the pictures.
We then upped the boost 2-3psi at time, did a run, changed fueling. 15psi made around 270whp, then we added more timing, hp went up. 21psi made around 320whp, then we up the boost to 24psi, and changed added timing to get it to 350whp.
We didn't use lilknockmeter at all.