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Dump valves?
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[quote][i]Originally posted by tiga77[/i] The twin piston dump valves only solve stalling issues by having 2 flanges. One that remains shut when the car is not using pressure to stop any stalling issues, the other flange opens and closes just like a single piston dump valve. As for the detonation :- yes the dump valve does make the cars run rich - HOWEVER as the ECU and knock sensor detect the car is running rich, it adjusts the air/fuel mixture accordingly and flips it the other way - so it runs lean. THis is how the detonation causes. The ECU doesnt reaslise that all of the preivously 'metered' air has escaped into the atmosphere and that is how the car runs lean. It doesnt stay running lean - it will revert back to running rich, but when the ECU and knock sensor detect this again, the same thing happens hence running lean. Loads of articles on the net if you search for dump valve and air flow meter problems. There was even an investigation by a motorsport expert who clarified the issue - which is basically what I have just said in the last couple of messages. :) HTH [Edited on 07-05-2004 by tiga77] [/quote]
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