I haven't posted an update lately and since I dyno tuned my car this weekend I figured this is as good a time as any :). My Cobra had a full exhaust (shorties, catted mid-pipe, cat-back), cool air kit, bigger lower pulley, a chip, and an Afterburner-eFPC. A week ago I added a smaller upper pulley to the mix and updated my chip program.
This weekend I spent a couple of hours on the dyno and got the fuel delivery dialed in. She currently starts out at about 11:1 AFR in the low rpms and that ramps pretty evenly to 12:1 AFR at the top end. I decided to buffer the peak torque band with a bit more fuel. I could go a little leaner with the forged components but I didn't get much change in output when I tweaked the fuel in that direction so I decided to leave it where it's currently at.
The final results were:
Actual output: 391.2 rwhp / 421.6 rwtq SAE output: 465.5 rwhp / 501.7 rwtq
SAE CF was 1.19 which is about as good as I've seen it at about 5300 ft altitude here in Albuquerque. Great air :). The SAE deltas from my previous dyno session were:
Peak change in power: +3.8 hp Peak change in torque: +24.5 ft-lbs
Max change in power: +28.0 hp Max change in torque: +38.7 ft-lbs
Average change in power: +13.5 hp Average change in torque: +20.0 ft-lbs.
I'm pretty happy. I got great gains in the low and mid ranges for about a
2.5 psi increase in boost. Unfortunately, I've run up to the Eaton's efficiency limit, hence the small change in top end power. The Eaton hit a peak boost of 13 psi but dropped off to 10 psi by redline.Time to start considering alternatives to the Eaton :).
Dan
2003 Cobra convertible With some stuff and things