No lift shift (manual trans) is making my car backfire, am I doing it wrong?
2017 SS manual transmission. All stock, 2000 miles, always run premium gas.
So I went to the drag strip last week and tried no lift shift for the first time. While it did seem to function and do it's job correctly, every time I would use it, right when I would shift I would get a loud backfire from the car. I thought I was doing it wrong so I stopped. I tried it again when I went back to the drag strip this weekend, and same thing, a loud backfire when I shift. I have the car in competition mode, I am shifting at around 6200-6300 rpm (not hitting the rev limiter), and I am holding the gas to the floor for the whole pass. Not sure what I am doing wrong? But I am afraid of breaking something with the car backfiring like this. When i shift normally, I never get these loud backfire like sounds. Has anybody else tried this no lift shift feature? |
I have the A8 and get the same thing when it shifts under full throttle (lower gears). Several people have posted on here that it is programmed that way in the ECU. Fine with me.
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OP, I think from what I have gathered this is normal with no lift shift. Not to many on here have used this function, heck, I don't think many even know their car has it... I think what happens is spark is cut for a millisecond so you don't over rev, but the injectors still keep firing, so that extra fuel gets dumped into the exhaust, hence giving you the backfire sound you describe. I called it a gunshot like sound, but I think the technical term is "afterfire". I'm sure someone with more knowledge on this will comment, but I think when you use no lift shift that loud backfire is 100% normal. |
I have done the no lift shift in competition mode a few times and no backfire. It is my understanding that one needs to be in competition mode for the no lift shift right?
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So the no lift shift is basically normal shifting at WOT just without taking your foot off the gas correct?
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And as it's something built into the ECU, how harmful is it to the trans and clutch? I do a good bit of racing so just seeing if it's worth using
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Like the other guy said it sounds like a single loud gunshot. |
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