DME tune issue

AZ_Bmw_550 · 08-04-2018, 05:19 PM

I have a DME tune on my 2015 650i GC N63tu engine, (35000 miles on it). It seems to pull well on the cooler days, but I can sometimes feel a stumble or backing off of the power in certain RPM ranges. It's most notable under part throttle. At WOT it feels okay, but I think the stumble is just getting a little masked by the thrust. On hot days in AZ it's super noticeable. No codes are showing or could be extracted by a Carly, (not an ideal diagnostic tool). If I'm perfectly honest with myself, the car seemed a little down on power even before the tune. Does anyone have any ideas on where I could begin to diagnose this condition? Also, there's no other mods on the car, removed carbon filters, added the tune is all. Any help or ideas are appreciated.

$howtime456 · 08-04-2018, 05:48 PM

do you have a way to datalog? Have you made revisions to the tune or was it just slapped on the car 1 time? Either way the tune changes with the weather. Hotter climates car will be reduced in power with out the right cooling features. Methanol injection, oil coolers etc.

AZ_Bmw_550 · 08-05-2018, 12:14 AM

Yep, I expected the heat to take the power down, but not to create the stumble issue. I'll get something on my laptop to do some data logging. Thanks for the help.

upstate650 · 08-05-2018, 08:56 AM

Have you talked to DMe about the issue? That’s where the support of a trusted tuner comes into play. 115 degree temps will definitely cause issues. Maybe consider the dinan intercoolers.

$howtime456 · 08-05-2018, 07:38 PM

Quote:

Originally Posted by AZ_Bmw_550

Yep, I expected the heat to take the power down, but not to create the stumble issue. I'll get something on my laptop to do some data logging. Thanks for the help.

no problem bro

08-04-2018, 05:19 PM	#1
AZ_Bmw_550 Private First Class 52 Rep 183 Posts Drives: 2015 BMW 650i GC Join Date: Feb 2015 Location: United States iTrader: (0) Garage List 2011 BMW 550i [0.00]	DME tune issue I have a DME tune on my 2015 650i GC N63tu engine, (35000 miles on it). It seems to pull well on the cooler days, but I can sometimes feel a stumble or backing off of the power in certain RPM ranges. It's most notable under part throttle. At WOT it feels okay, but I think the stumble is just getting a little masked by the thrust. On hot days in AZ it's super noticeable. No codes are showing or could be extracted by a Carly, (not an ideal diagnostic tool). If I'm perfectly honest with myself, the car seemed a little down on power even before the tune. Does anyone have any ideas on where I could begin to diagnose this condition? Also, there's no other mods on the car, removed carbon filters, added the tune is all. Any help or ideas are appreciated.
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08-04-2018, 05:48 PM	#2
$howtime456 Major 301 Rep 1,230 Posts Drives: BMW 640i Join Date: Mar 2017 Location: NY iTrader: (0)	do you have a way to datalog? Have you made revisions to the tune or was it just slapped on the car 1 time? Either way the tune changes with the weather. Hotter climates car will be reduced in power with out the right cooling features. Methanol injection, oil coolers etc. __________________ N55 GENERAL David Shoup Tuned Fully Built By Miami Engines/Project Motorworks Precision 6266 On Steroids
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08-05-2018, 12:14 AM	#3
AZ_Bmw_550 Private First Class 52 Rep 183 Posts Drives: 2015 BMW 650i GC Join Date: Feb 2015 Location: United States iTrader: (0) Garage List 2011 BMW 550i [0.00]	Yep, I expected the heat to take the power down, but not to create the stumble issue. I'll get something on my laptop to do some data logging. Thanks for the help.
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08-05-2018, 08:56 AM	#4
upstate650 Lieutenant Colonel 305 Rep 1,719 Posts Drives: 2014 650xi Gran Coupe Msport Join Date: May 2013 Location: The Hinterlands of Upstate NY iTrader: (3) Garage List 2020 BMW M340xi [0.00]	Have you talked to DMe about the issue? That’s where the support of a trusted tuner comes into play. 115 degree temps will definitely cause issues. Maybe consider the dinan intercoolers.
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