bluelines:

On the 997.1 the electrical signal to the pneumatic solenoid was pulse-based. One pulse, on. Next pulse, off. Hence the flaps could only be in two positions, fully open or fully closed. I assume the system is identical on the 997.2 and the flaps are not variable between fully open and fully closed (only mentioning that since some people were speculating that the DME is continuously adjusting the flaps).

I'll measure the sound with a dB-meter now to end the discussion angry

Gert's contention is that his device has the effect of 'training the DME' not to continuously adjust the flaps - hence always fully open - hence louder sound.  This presumes that, with stock, the flaps are constantly varied by the DME...

It's easy to check when the car is stationary but a different proposition under acceleration...Smiley

 


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"Things turn out best for people who make the best of the way things turn out."