That question of why 70% throttle works better than full is interesting and I hope somebody can come up with an in-depth answer for it. It can't be limitations on either total air or total fuel because it's a low RPM problem. It must be an error in mixture or something.
One thing is just that, at low RPM, the difference between 70% throttle and 100% isn't going to affect the airflow nearly as much as the difference it makes at high RPM. With the engine sucking it in slowly, a throttle open that wide just isn't going to constrict it very much.
Oh, for a BMW valvetronic...
96 GL Zetec ATX, white with pinstripe, nickname " Sam Smooth " mods so far: CTA intake with homemade heat shield, KVR drilled front rotors & carbon pads w/ 500° fluid planned mods: exhaust (want to keep it quiet), e-ram (awaiting installation), diablo chip involuntary mods: compression increased after head gasket failure
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