Quote:
Originally Posted by thambu19
Why do they not react appropriately when we change ratios. With more pfi the ecu should have added the right amount of pulse width I would assume
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You would think, but the PI and DI fuelling algorithms are not dead on. There are differences with the scaling in both systems which mean that if you alter stock settings, the balance between PI and DI may change final fuelling quantity. There is also the issue of port fuelling running out the exhaust in high overlap areas which should not happen as much with DI fuelling. We are reliant on our lambda sensors to give us information of what is happening just after the cylinder, but don't have the ability to find out what is actually happening in the cylinder...
I set the car at 100% DI and got the MAF rescaled to flat, then set to 100% PI and set PI scalar and latency to get the PI fuelling in line - made everything run much smoother. You can work it any way you want.