Turbo speed sensor ever used ?

[Greg Hermann]

>>Boost VS.backpressure is great to know in development stages.Tells the
>>efficency
>>of the turbo used.
>>Spool up creates more backpressure ,more backpressure ,wants less ignition
>>advance.
>>less air consumption .A fast car is living in theese arias all the time .
>
>mmm - Interesting, I'd assumed air flow measurement and MAP would be
>sufficient to determine volume of air entering the chamber. Are you
>suggesting AFM doesn't give an accurate enough figure due to backpressure
>at the turbo and that MAP in no way assists this - in the circumstance
>where we have an AFM and MAP ?
>
>Should we have a pressure sensor before and after turbo or just one, surely
>AFM output would indicate chamber volume as the air can't go anywhere else ?
>
Espen is absolutely right. where you need the back-pressure sensor is
between the engine and the turbo. Back pressure on the engine affects
cylinder filling and fuel requirements on a turbo motor just as it does on
an NA engine.

Greg


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