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tps and MAP accel fueling together

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I've noticed on some of the cars that I've tuned with G4's that it would be good to have both accel fueling strategies available at the same time. Primarily I use tps based accel fueling, but on some turbo engines, you can get a bit of leaness when the turbo spools, and tuning with map based accel fueling alone is not much of an option on engines with decent sized cams. 

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  • 2 years later...

Bumping this topic... I'm surprised no one else has interest in this. OEM systems I have worked with do this, and it makes sense. At low throttle openings, a change of throttle angle is a better trigger for transient fueling than map for engines that have low / noisy idle vacuum. However, at steady throttle angles, on a turbo engine, as the boost builds, there can be a need for additional fueling, otherwise you get a lean spike. I've noticed this when tuning steady state and then doing transient sweeps, if you tune to the sweep, you get a inverse V in your fuel map. 

Certainly this is not reinventing the wheel, just doing what the OEM's have already been doing for many years, and for good reason. 



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  • 3 weeks later...

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