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hexdmy

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    hexdmy got a reaction from mapper in tps and MAP accel fueling together   
    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. 
     
     
  2. Like
    hexdmy got a reaction from Davidv in tps and MAP accel fueling together   
    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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