Acceleration 'warble'

integraworks · 09-11-2011, 05:36 PM

I am running my 2010 35i with ESS Tune stage II. When under heavy acceleration in both 2nd and 3rd gear, from about 3500 RPM to about 6000 RPM I have a distinct warble or pulse in the acceleration. It is more annoying than anything else. Seems to be more pronounced in hot and humid weather than on cool mornings.

Any ideas what might be causing this warble/pulse?

Thanks

teagueAMX · 09-11-2011, 09:05 PM

Mass air flow sensor, fuel pressure regulator, fuel injector, air filter, fuel filter, fuel pump, etc, just to name a few. The other possibility is the tune programing itself. I left that to last because one would assume others would have talked about it but you never know.

The dealer is the only one that can adequately diagnose this problem, and he's not going to like your tune. Talk to your tuning expert and ask him to return the ECU back to it's original spec before you take it in to the dealer.

integraworks · 09-15-2011, 06:10 PM

Update. Since the weather has taken a turn to cool / chilly, the acceleration warble/fluctuation has disappeared. So it would appear that the issue only happens when the weather is hot & humid.

Gunzaro · 09-16-2011, 05:08 PM

I have found this to be the case too. ESS tune also.

Land_Shark · 09-17-2011, 10:09 AM

Has anyone else experienced this in humid/hot weather... I am almost on the Go to get the ESS tune, but this thread seems to pull my breaks.... ???

09-11-2011, 05:36 PM	#1
integraworks Private 17 Rep 88 Posts Drives: 2010 Z4 s35i Join Date: Feb 2011 Location: Ontario iTrader: (0)	Acceleration 'warble' I am running my 2010 35i with ESS Tune stage II. When under heavy acceleration in both 2nd and 3rd gear, from about 3500 RPM to about 6000 RPM I have a distinct warble or pulse in the acceleration. It is more annoying than anything else. Seems to be more pronounced in hot and humid weather than on cool mornings. Any ideas what might be causing this warble/pulse? Thanks
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09-11-2011, 09:05 PM	#2
teagueAMX Colonel 62 Rep 2,087 Posts Drives: Some are road worthy Join Date: Apr 2009 Location: So Cal, USA iTrader: (0)	Mass air flow sensor, fuel pressure regulator, fuel injector, air filter, fuel filter, fuel pump, etc, just to name a few. The other possibility is the tune programing itself. I left that to last because one would assume others would have talked about it but you never know. The dealer is the only one that can adequately diagnose this problem, and he's not going to like your tune. Talk to your tuning expert and ask him to return the ECU back to it's original spec before you take it in to the dealer. __________________ "Political correctness is a doctrine fostered by a delusional liberal minority and rabidly promoted by an unscrupulous mainstream media which holds forth the proposition that it is entirely possible to pick up a turd by the clean end".-- Unknown
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09-15-2011, 06:10 PM	#3
integraworks Private 17 Rep 88 Posts Drives: 2010 Z4 s35i Join Date: Feb 2011 Location: Ontario iTrader: (0)	Update. Since the weather has taken a turn to cool / chilly, the acceleration warble/fluctuation has disappeared. So it would appear that the issue only happens when the weather is hot & humid.
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09-16-2011, 05:08 PM	#4
Gunzaro First Lieutenant 37 Rep 378 Posts Drives: Speed Racer Join Date: Jan 2011 Location: In transit iTrader: (0)	I have found this to be the case too. ESS tune also.
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09-17-2011, 10:09 AM	#5
Land_Shark In The Flesh 23 Rep 600 Posts Drives: Z4 sDrive 35i Join Date: Oct 2010 Location: Hong Kong iTrader: (0)	Has anyone else experienced this in humid/hot weather... I am almost on the Go to get the ESS tune, but this thread seems to pull my breaks.... ???
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