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Sequential Gearbox with a Gen3 PCM - How to reduce torque for shifting
We have a race car with a LSx engine using a 2000 F body PCM.
We are installing a sequential gear box and need a method to reduce torque during shifts.
We discussed interrupting the ignition coils, but we also discussed interrupting the IAT, which I believe will throw the ignition into a different map, which could be used to reduce torque.
Anybody know if this will work? Will it cause problems with the PCM?
I think your idea to trigger the IAT sensor on a clutch switch is probably the best bet for a consistent and easily adjustable shift timing retard. I think an open circuit on the IAT will show as the lowest readable temperature. Then you can set this IAT Spark Advance Correction table in the 14° column to pull timing. Nitrous guys sometimes do this same thing with their nitrous activation switch so they can have just one tune in the ECM.