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Registered
Join Date: Aug 2006
Location: Cincinnati, Ohio
Posts: 1,019
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Let me know when you want to stop down.
The injectors are 42 lb Ford Units (disc style). I didn't plot the A/F ratio...it has a tiny lean spot at 3800 that I need to go in and snip out and also on tip in I have to add some fuel with the accelleration settings...minor changes really.
We picked up 3 or 4 knocks on the high load pulls...I snipped the timing back a bit in these areas and that knocked it out. Ignition tuning is so very important to engine longevity in a case like this.
Without the Shark Tuner, this project would have been a lot more difficult. Not impossible, but very difficult. Remember these compressors make a lot of boost mid range which is why my torque is so high. Add torque means added HP and added fun!!! If you choose to not shave ignition out in this area you are setting yourself up for disaster.
Special thanks to John Speake for the Shark Tuner and lending of his time along the way to discuss the options with me. John gave willingly of his time...twice in person when I was in the UK and many times over the phone with all the learning curves, etc.
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Kuhn Performance Technologies, LLC
Big Gun: 1988 928S4 Twin Turbo, 5-SPD/LSD 572 RWHP, 579 RW ft-lbs, 12 psig manifold pressure. Stock Internals, 93 octane.
Little Gun: 1981 928 Competition Package Twin Turbo, 375 RWHP, 415 RW ft-lbs, 10psig manifold pressure. Nikasil Block, JE2618 Pistons, 93 octane.
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