DME tune issue

AZ_Bmw_550 · 08-04-2018, 05:18 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.

AZ-MCRacer · 08-05-2018, 12:18 AM

Can you get logs from your car? The heat we have in AZ will make it pull timing and you will lose some power, but it shouldn't be a tremendous amount.

paul223 · 08-05-2018, 05:59 AM

You need bigger intercooler.

AZ_Bmw_550 · 08-05-2018, 04:35 PM

Quote:

Originally Posted by paul223

You need bigger intercooler.

That is probably true, but would high IAT make it stumble? I expect it to back off timing/boost and have less power, but the stumble seems like something else to me. Thanks for the info.

$howtime456 · 08-05-2018, 09:02 PM

Quote:

Originally Posted by AZ_Bmw_550

That is probably true, but would high IAT make it stumble? I expect it to back off timing/boost and have less power, but the stumble seems like something else to me. Thanks for the info.

have you refreshed your coils, plugs, injectors?

warpeacelove · 08-05-2018, 11:41 PM

Quote:

Originally Posted by AZ_Bmw_550

That is probably true, but would high IAT make it stumble? I expect it to back off timing/boost and have less power, but the stumble seems like something else to me. Thanks for the info.

Could be spark plugs, injectors or coils.

AZ_Bmw_550 · 08-05-2018, 11:57 PM

Wouldn't injectors or coils throw codes?

M335 · 08-06-2018, 08:33 AM

Quote:

Originally Posted by AZ_Bmw_550

Wouldn't injectors or coils throw codes?

Not always....Can you get logs?
I would change a spark plugs with one step colder NGK SILZKBR8D8S

$howtime456 · 08-06-2018, 09:19 AM

Sometimes it won't throw codes unless it's completely out. I would suggest ngk 97506 and gap them suckers to 21 22.

ssgm1x · 08-10-2018, 03:43 PM

need a log......

Fishsticks · 08-12-2018, 06:20 PM

What tune are you running? I agree you need to log it and start troubleshooting from there. Depending on your tuner, they should also be able to look at your logs to see if anything looks out of line. I'm running the BM3 S2 and the first map I ran was somewhat jittery in higher rpms, but the new version of it is very smooth, so it could also be the tune since all cars don't respond the same.

AZ_Bmw_550 · 08-12-2018, 11:13 PM

The tune is from BPC and so far they haven't been much help. I'm on travel for a couple of weeks and then will get some logs posted and start troubleshooting.

badblack550xi · 08-13-2018, 09:13 PM

sounds like engine/transmission mounts or driveshaft cracked or all together.

08-04-2018, 05:18 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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08-05-2018, 12:18 AM	#2
AZ-MCRacer First Lieutenant 306 Rep 332 Posts Drives: 2022 G82 M4, 2013 F10 N55 Join Date: Oct 2016 Location: Tempe, AZ iTrader: (0)	Can you get logs from your car? The heat we have in AZ will make it pull timing and you will lose some power, but it shouldn't be a tremendous amount. __________________ 2022 G82 M4 - Isle of Man Green w/Kyalami Carbon Bucket Seats - MST Intakes, SSR Downpipes, JB4, AWE Exhaust. 2013 F10 N55 (535i), Pure Stage 2, Fuel-It PI Platinum, Fuel-It Stage 2 LPFP, BootMod3, Custom Turbo Inlet, Custom Cary Jordan Tune, More.. SOLD! 1999 e36 M3 - Estoril Blue - Track Car - S54 Swapped
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08-05-2018, 05:59 AM	#3
paul223 Major 411 Rep 1,126 Posts Drives: F10 Join Date: Dec 2013 Location: arkansas iTrader: (0)	You need bigger intercooler.
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08-05-2018, 11:57 PM	#7
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]	Wouldn't injectors or coils throw codes?
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08-06-2018, 09:19 AM	#9
$howtime456 Major 301 Rep 1,230 Posts Drives: BMW 640i Join Date: Mar 2017 Location: NY iTrader: (0)	Sometimes it won't throw codes unless it's completely out. I would suggest ngk 97506 and gap them suckers to 21 22.
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08-10-2018, 03:43 PM	#10
ssgm1x Captain 419 Rep 771 Posts Drives: 2020 M340i & 2018 M3 Join Date: Aug 2017 Location: Cherry hill ,NJ iTrader: (0)	need a log...... __________________ 2020 BMW M340ix Dravit Grey 2018 BMW M3 Alpine White
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08-12-2018, 06:20 PM	#11
Fishsticks Private First Class 7 Rep 106 Posts Drives: 14 Jet Black 550i Join Date: Jul 2012 Location: NE Florida iTrader: (0)	What tune are you running? I agree you need to log it and start troubleshooting from there. Depending on your tuner, they should also be able to look at your logs to see if anything looks out of line. I'm running the BM3 S2 and the first map I ran was somewhat jittery in higher rpms, but the new version of it is very smooth, so it could also be the tune since all cars don't respond the same. __________________ Jet Black 550i M Sport Vorsteiner V-FF 102, Vorsteiner Lip, KW v2, M5 Comp DPs + Full Exhaust, BMS JB S1 Tune
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08-12-2018, 11:13 PM	#12
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]	The tune is from BPC and so far they haven't been much help. I'm on travel for a couple of weeks and then will get some logs posted and start troubleshooting.
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08-13-2018, 09:13 PM	#13
badblack550xi Colonel 465 Rep 2,416 Posts Drives: F10 550i 2011 F90 2020 COMP Join Date: May 2013 Location: NJ iTrader: (0)	sounds like engine/transmission mounts or driveshaft cracked or all together. __________________ 2011 550i RWD 60-130 7.35
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