Quote:
Originally Posted by mad chemist
Guys,
Just wondered if the exhaust valve is not just for noise emissions?
Quite commonly in the motorbike world they use a similar valve to improve back pressure in the lower-to-intermediate revs range and so improve low down torque. I wouldn't be surprised if you would loose a little of the torque way down low (say 1,300-2,500 rpm) by making this modification.
Just my 10$ worth.
Mad Chemist.
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This is a very good theory and I'd be interested to see 2 different dyno plots to see if you're right. Based the amount of technology in these engines and the fact that
if the valve was used in the tuning of the motor, I'm guessing the flapper itself would have a sensor on it to check the state at all times (not just "open" or "closed", but the actual
angle of the flapper as well).
I'm not ruling out your thought (by any means), but feel that it's probably not going to hurt anything to disable the valve..