Andrew Robertson Posted June 14, 2012 Report Share Posted June 14, 2012 Hi, got a 383 SB Chev turbocharged pump gas application running fairly high static compression and 5 speed manual trans, running G4 extreme sequential firmware 4.6.9.   I have ignition angle on boost set so the car can take boost without detonation in high gears like 4th and 5th where it sits there heavily loaded with RPM climbing relatively slowly. In second and third it can tolerate 2-4 degrees more timing in modes where it sweeps quickly up in RPM, and it feels noticably punchier in the mid range peak torque area if I dial in that extra timing, however this amount of timing causes det in taller gears on boost where RPM delta is lower. Is there an easy way to add an ignition trim to my on-boost timing based on RPM rate of change? I haven't got a knock sensor and don't really want to muck around with the installation of one, and I've got no easy way of telling the G4 what gear I'm in either. Cheers, Andrew Quote Link to comment Share on other sites More sharing options...
Kurt Finearty Posted June 16, 2012 Report Share Posted June 16, 2012 I'm pretty sure you can add 'rpm rate' as an axis in the ignition table ! Create a 4d or 5d ignition table and use the 'rpm rate of change' as an axis - to reduce or advance ignition timing ! Quote Link to comment Share on other sites More sharing options...
Scott Posted June 17, 2012 Report Share Posted June 17, 2012 Hi Andrew, Kurt's suggestion is a good one. Give that a go and let us know if you have any problems. Cheers, Scott Quote Link to comment Share on other sites More sharing options...
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