07-11-2013, 08:20 AM | #1 |
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revving stablely, but RPM's up and down
So I was going to just give a nice warm up for the car.. and warm the engine a little bit, so I rev the pedal stable and stay at a point where the rpm shud be stable, but then the RPM goes up and down unstable..
The car had full exhaust system, catless dp, afe sealed intake, Macht tuning (a piggyback sort of) |
07-11-2013, 11:40 AM | #4 | |
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Asking the question is partially answering it. Unstable revs ain't normal. Of course this has to be distinguished from the first minute warm-up sequence when the engine is cold: those rev variations are perfectly normal (emissions driven purpose: programmed to rapidly heat up the catalyst to optimal working temps to enable these to work more efficiently sooner).
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Wild guess: the changes to the 1M stock set-up do not interact as well as supposed. A matter of parameter modulation might be a big contender to explain what your car is experiencing.
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07-11-2013, 11:55 AM | #5 |
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Side note: Don't rev a standing still car for warming purposes. Wait around 30 seconds without revving at all which is the approx. time for cold start thunder lasts and then just drive it smoothly and progressively up to normal operating temperature. Your car will like it more.
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07-11-2013, 11:59 AM | #6 | |
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on 2000 ups the revs are normal.. but around 1400-1800 the somehow there is just like something that cut the power and let it go again.. on and on.. till it goes up and down around 1400-1800 rpm |
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07-11-2013, 12:00 PM | #7 | |
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07-11-2013, 12:09 PM | #8 |
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Why would you hold the RPM higher in neutral? Stop doing that!
It is like "Hey doc, it hurts when I fold my arm backwards" Doc: "well stop doing that" |
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07-11-2013, 12:58 PM | #9 | |
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but then on 1400-1800 pedals are stable yet RPMs go up and down around them... well on driving the car seems to drive normal.. |
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07-11-2013, 11:51 PM | #13 | |
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07-12-2013, 06:47 AM | #14 |
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Flew to the capital, coincidently I had a visit to the capital, which means I visit the only M dealership and authorised workshop in the country and showed them the video and they say it's fine.. so yeah
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07-12-2013, 06:54 AM | #15 |
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It's hard to know what to say about this. The "sorta" piggy back ECU would be the first thing I'd yank to trouble shoot. As mentioned it's hard to be an internet Dr. from afar.
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07-12-2013, 10:26 AM | #16 |
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I have a Procede and when I'm on cruise control it doesn't cruise smoothly. There's a strange pulsing power surge. When I put it on map 0 (stock), it's all good. I would say your issue is tune related. Wouldn't think it's normal.
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07-13-2013, 11:29 AM | #17 |
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yup, thanks, well i dont really mine cos it do me good on normal driving .. as long as its fun .. lol
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