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      07-11-2013, 08:20 AM   #1
Jay-K
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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)
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      07-11-2013, 08:39 AM   #2
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Are you asking for a diagnosis?
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      07-11-2013, 10:12 AM   #3
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Quote:
Originally Posted by Dan Parker View Post
Are you asking for a diagnosis?
I really have no idea.. is this something I have to worry about?
Thanks for the reply
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      07-11-2013, 11:40 AM   #4
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Quote:
Originally Posted by Jay-K View Post
is this something I have to worry about?
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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Originally Posted by Jay-K View Post
The car had full exhaust system, catless dp, afe sealed intake, Macht tuning (a piggybag sort of)
That multiplies the number of possible causes. "Doctor, it hurts somewhere !": difficult for the doc to sensibly help you out if you're vague about your medical history and recent activities/encounters.

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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Quote:
Originally Posted by Artemis View Post
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).



That multiplies the number of possible causes. "Doctor, it hurts somewhere !": difficult for the doc to sensibly help you out if you're vague about your medical history and recent activities/encounters.

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.
well, i tried it for like 5 minutes later and it still wont be as normal,
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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Quote:
Originally Posted by ozinaldo View Post
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.
yup, i never done that purposely, its just that i found out i couldnt stabilize revving on 1400-1800 ..
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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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Quote:
Originally Posted by MightyMouseTech View Post
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"
just figure out that things are pretty normal on 2000-3000++
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, 01:20 PM   #10
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SO GUYS, MANAGE TO RECORD LAST NIGHT!!!
and in this short video is exactly what happen when i press the pedal stabily.. it goes up and down...
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      07-11-2013, 09:22 PM   #11
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Tried to run it this morning and everything seems fine
Tried to stabile the rpm while car moving and everything was fine..
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      07-11-2013, 09:41 PM   #12
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Well the car still do the same when I revv it on standstill position..
What I want to know is that is something wrong? Or something is going to be wrong.. ?
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      07-11-2013, 11:51 PM   #13
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Quote:
Originally Posted by Jay-K View Post
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)
It is the tune causing the power surge. Remove the tune and see if it still happens.
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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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Quote:
Originally Posted by froop View Post
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.
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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