Quote:
Originally Posted by Tom '74 911
Scott,
That's super cool and interesting, what you're doing. I'm interested to hear how it feels on the track, especially how it compares to your previous setup. Kind of apples to oranges, but my daily driver VW Golf R is drive-by-wire and there are some funny things about it... how the throttle pedal feels sometimes, how responsive it is etc... It probably has a lot to do with the ECU and how it's programed - one funny thing is that you can't be on the throttle and brake at the same time. If you brush the brakes and don't lift off the throttle, the ECU automatically cuts the throttle, and there's a lag before it picks up again when you get off the brakes. Anyway, lots of tuning options likely available... I'm interested to hear about how it feels and how much fiddling it takes to work it out.
Tom
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Yep that brake override is a safety thing so that the car will stop when someone panics and hits both pedals at once. A lot of manufacturers added that during the whole Toyota unintended acceleration scare, when they found out that it was just old people hitting the wrong pedal.
The rest of it, though, the lack of instantaneous response, is for emissions. Rapid throttle changes are bad for controlling fuel mix so they get smoothed out. If you have a manual they'll also mute the throttle during shifts so you don't destroy the clutch.
I hate those things. A lot. If they're mapped for linear response, though, they can be absolutely fantastic, so very cool to see this work!