I Would you believe that in EFI cars it is possible to have the throttle plate fully open (by the ECU, of course, taking cue from the DBW throttle pedal) and yet go nowhere? This happens when the ECU cuts signal to injectors, stopping supply of fuel to the engine. Of course, I want the revs drop fast when upshifting. This was the reason behind my efforts to delete rev hang. If you want to read more about my rev hang investigations, look at my rev hang webpage.
Wouldn't that lean out the fuel? More air without increase in fuel?
Originally Posted by curtis265
How do you suppose unburnt fuel goes into the PCV system? I think your motor may be on the way out if that's the case. Perhaps you mean EGR? Even still this does not loop 100% of the exhaust back into the intake, so this is why they introduce rev hang, to burn the last of it.
So using this logic curt, your engine must be on its way too. Wait wait 100% cars on the road, their engines must be on its way out, cos of unburnt fuel in the PVC System. All engines will make a little bit of unburnt fuel. Specially Factory tune turbo cars as they are tuned to run rich from factory.
How do you know that the power is not being controlled by the wastegate? or valve trickery?
I guess to some extent these are used as well, isn't the throttle basically a valve for air? so it is valve trickery. Since there are changes to amount of air intook by the engine so corresponding adjustments must be taking place in the wastegate, since there is less spool.
I would rather my revs drop to the right level rather than hang and sacrifice smoothness
This I agree with
Originally Posted by aquasurf
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