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Ramantanis Dimitris

upreving with TPS 0%

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Hi,

my car is a twincharger. air root is filter>turbo>W2A intercooler 1>throttle body>supercharger>W2A intercooler 2> engine.

My problem is that when I have TPS wide open with low rpm and then close TPS and push clutch at same time, engine continues upreving for some miliseconds. I'm using fuel cut. It seems that it takes some milliseconds till full vacuum so map sensor reads some air in the piping because TB is a bit away from the inlet.

Is there any solution?

 

Thanks

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My thought would be the same as yours - with supercharger, pipework, intercooler all before the throttle, you probably have 10 litres or more of "plenum" volume that the engine has to evacuate when the throttle closes. 

Ideally you would move the throttle blade to a more appropriate location, but thinking outside of the box - you could possibly use cyclic idle to stop the "flare up". 

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On 3/12/2017 at 11:33 AM, Adamw said:

My thought would be the same as yours - with supercharger, pipework, intercooler all before the throttle, you probably have 10 litres or more of "plenum" volume that the engine has to evacuate when the throttle closes. 

Ideally you would move the throttle blade to a more appropriate location, but thinking outside of the box - you could possibly use cyclic idle to stop the "flare up". 

Sounds a good idea.

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