Sounds interesting Ahmet ... but I would think that making the holes in the flap door requires that the smaller force on the flap be counteracted by a larger motion due to the reduction in the stiffness in order to achieve the correct mixture.
I've been reading about throttle switch and MAF stuff to fix this annoying problem of the rpm overshooting the idle speed when the throttle closes when I slow down or come to a halt, and it seemed like the MAF tension would be the best thing to modify. However, that would change my whole mixture profile, so I dicided to let it be until I work out other problems in the car.
What I've found thought, was that on some Jaguars, some modification company actually does exactly what you were about to do ... loosen up the flap door spring tension to allow more air in ... However, they counter act for the reduced tension by modifying the DME to put out less gas at the same opening angle of the MAF ...
Other interesting things ... the throttle switch detects either idle, or full throttle, and at both extremes, the signal from the O2 sensor is ignored, and the signal from the engine temp sensor is 'tricked' to make the DME think that the engine is cold, thus richening the mixture ...
Do you know the small 5mm hex nut on the MAF .. I screwed that in all the way to get rid of that rpm overshoot problem, and I think it worked. Of course I had to compensate for the higher idle speed by closing the idle screw on the throttle body. Does that hex nut actually control the idle position of the flap door?
Good luck.
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Lock Stock '84 944 and two smokin' tires ...
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