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Jon Caldito - Question about throttle response. (archive)

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Posted by Bob ///M3 on June 20, 2000 at 08:25:21:

Jon, our M3's throttle response is controlled by sensors, etc. instead of the drive-by-wire method but I understand the new E46 M3 will be able to be controlled either way. Is this right and if so, how how can they offer both on the same car? I don't see how BMW can seperate one method and apply the other with a simple flip of a switch. If you can offer an explanation I would appreciate it.

It takes a while to get used to the delayed rpm descent when coming off throttle. The rpm decrease is delayed by about a half-second or more it seems. I quess this intentional delay is built into the car's electronics for some particular purpose; maybe to smooth out "lift throttle" suspension upset, possibly something to do with the ASC system for better stability control, to offset a lighter than normal flywheel and/or maybe help with smoother shifting?

It seems to me that by keeping the rpms up (or maintained) for even a fraction of a second after lifting off the throttle would lessen the car's ability to be driven at its limit by an accomplished driver. Also, it seems this throttle response delay would impair the car's ability to stop as well too.

I should know, but I'm assuming this delayed throttle response is the same whether the ASC+T in on or off...right?

Thanks Jon, as always.

Bob ///M3


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