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Re: Jon Caldito - Question about throttle response (archive)

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Posted by Bob ///M3 on June 20, 2000 at 13:51:33:

In Reply to: Re: Jon Caldito - Question about throttle response posted by Jon Caldito on June 20, 2000 at 13:38:09:

Thanks Jon. Yes, you did answer my questions.
The M3 flywheel's inertia just seemed to remain longer than what would seem to be possible without help from some source such as electronics (sensors) and the DME.

Thanks again Jon.

Bob ///M3


: Hey Bob!

: I'm a bit confused about your question. You said that the throttle response is controlled by sensors instead of drive by wire. This is sorta true but the throttle valve on the E36 M3s is physicaly attached to the gas pedal with a bowden cable. No electronics are involved (throttle valve) except that there's a throttle position sensor giving input to the DME. Mind you that there is a second throttle body for ASC to reduce engine air intake.

: The new M3 engine will have something similar to what the new M5 engine has which is a drive by wire but is called EDR which means electronic throttle control system. In this system, there's a pedal position sensor and gives input to the DME in how much the individual throttle bodies open via a motor which is connected to the throttle bodies. I'll take pictures tomorrow of the engine my school has and you'll get a better idea of how it works.

: The switch or sport mode I think you're reffering to on the new E46 M3 will open the throttle valves a lot more faster and steering will be more stiffer. It may even set a new sport MAP for the DME.

: The delayed RPM deceleration is normal. The dual mass flywheel keeps it's inertia. When you're decerlating from high rpms, then deceleration slip control takes place. A fluctuation in the wheel speed sensors might occur and the ASC module will tell the DME to open the idle air control valve to balance the vechile, so yes you are correct when you mentioned about to smooth the suspension upset and to relieve engine drag torque.

: I've driven a car with a lightweight flywheel and deceleration RPMs drop a lot quicker! Not sure if it'll help in smooth shifting but if you're on the track and know how to shift, it very might be.

: I hope I answered your question.




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