Smooth Throttle for UpRev

DIGItonium

IIRC, Sam says he left the tables alone for safety reasons, so it's simply a tune. Therefore, throttle response is the same before and after the flash. The only difference is when boost kicks in, and it feels like an extra push.

What will probably mess things up for boost is when I'm pressing down on the pedal halfway, and the throttle ramps up slow enough boost won't even build up as if the physical throttles aren't opening up as much as expected.

I have this feeling there's no 1:1 correlation with the accelerator potentiometer position and actual throttle position (or VVEL response). One would think that 0-5V equates to a linear response in how a physical throttle would open up, right? There are times when 2.5V would feel like 50%, and other times 2.5V feels like 25% at the same engine speed. [shrugs]

I bet that'll throw a wrench in your throttle table(s) equation... It'll be nice to figure out how the tables are related to each other.

[EDIT] IIRC, from the UpRev forums, they say they're making progress with VVEL control.

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wstar

Yeah, in general (not just our car, all modern drive-by-wire cars) the pedal is taken as "human intent" to the ECU, and the ECU controls throttle based on a wide variety of factors. The throttle map we have definitely does something, but obviously we lack full control without VVEL tables as well.

If you want to experiment, you can completely disable Electronic Throttle Control. At the bottom of the list of editable stuff in the UpRev Rom Editor, there's an "ETC: On/Off" setting. I've set it to off before, and when you do that the car very literally maps 1:1 between the gas pedal and the "throttle" (although still, I imagine it's more VVEL than the manifold butterfly).

Throttle response with ETC Off is awesome, the problem is it kills a lot of other functionality on the car too. You'll lose cruise control (who cares), you probably lose the (safer) Throttle Rev Limit, having to just rely on the fuel cut rev limit, and most importantly you lose Synchro-Rev-Match.

On a track 6MT car, for someone who disables SRM to heel-toe anyways, ETC Off might actually be a viable option. On my 7AT it's a no-go though, the transmission can't execute downshifts properly without its own equivalent of SRM.

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7AT Track Car!
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