So I finally spent the time to remake this, and made it better. The last time I used this spreadsheet was to take a crappy IPW tune on a turbo formula car running e85 and turn it into a VE tune that actually didn't suck and made it so the car didn't make your eyes burn while it idled.

What would you use this for? Well if you're stuck tuning some ecu that is stuck in the 90's and only uses IPW/IDC, or if you have to fix a car that some "tooner" stuck in the 90's tuned with IPW/IDC when the ecu actually does support VE but doesn't include a IDC to VE converter (actually one of hydra's somewhat redeeming features).

And this is here so its hidden away in another place so its harder for me to lose. Don't be afraid to double check the math, or add gradients to the inputs/outputs. Or add the IPW to IDC converter that I was too lazy to add tonight.

 

In AEMLog (AEM's free datalog plotting program), you can define a math function and plot it. I defined VE:

VE = k * PW * AFR / MAP

where k is a constant proportional to injector size and inversely with displacement.

I used VE to tune VVT. A change in VVT angle that produces an increase in VE = mo' powah.

 

That was the plan, this just makes it easier to do manipulations to the fueling, say for when the turbo actually gets on the car I can make the in boost VE values make sense and once its tuned I can more easily play with the target AFR values.