Quote:
Originally Posted by Element Tuning
Sorry guys what I'm talking about with pedal overlap is not "ice mode." It's simply the DBW throttle closing too slowly therefore delaying engine vacuum and subsequently brake booster assist. Pump the brake pedal while the engine is running, feels spongy with lots of travel, now engine off, pump the brake, and now it will be rock hard.
So if you transition from throttle to brake fast enough, you will be greated with that rock hard pedal and no vacuum assist momentarily. The brake booster is a mechanical device so you can't trick it.
"Ice Mode" has something to do with the ABS computer programming in response to the wheel speed data. I believe it's a response to excessive ABS intervention so to further reduce potential lock up its reducing line pressure via the ABS pump.
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You can add an external reservoir or elect vac pump to assist, this is done all the time on big camed NA hot rods.
DougW