2021 M550i - Underperforming

Boosted_8 · 10-31-2021, 04:40 AM

You could well be right DB_BMW. The other possibility is that the LC program allows additional boost and therefore torque to build and remain held vs just brake boost W/ LC off. I suspect the TCU tune for LCI models is probably a while off as it’s only niche Russian outfits I can see offering much.

jmhildreth · 11-02-2021, 02:12 PM

I see Carbahn has a controller for the 2021 M550ix.

https://carbahnautoworks.com/product...-m550i-xdrive/

Is this the first and only tuning available for the 2021's?

Boosted_8 · 11-02-2021, 05:39 PM

Did another experiment tonight, traction off and brake boost with no LC. Squeaked out a cheeky ten second run! 60ft and 0-60 are slower but the gears hold till redline so the 1/4 mile is faster. If the gearbox when using LC behaved correctly, on a prepped track this thing is running 10.8 or less.

crypto · 11-02-2021, 05:52 PM

Quote:

Originally Posted by jmhildreth

I see Carbahn has a controller for the 2021 M550ix.

https://carbahnautoworks.com/product...-m550i-xdrive/

Is this the first and only tuning available for the 2021's?

Interesting. I hadn't heard about this…but also feel a bit ignorant to what this actually means. The pre-LCI offerings are "Smooth Power Flash Stage 1 software" and claim to get the car to 698 flywheel HP / 702 flywheel lb/ft torque.

Where this LCI offer (where they don't have a flash available) is.. "Performance Controller Stage 1" that is a plug and play ECU that gets LCI models to 637 hp/717 torque.

I don't know where this fits exactly compared to a flash tune and a piggy back. Seems it's neither.. are they saying it replaces your ECU? Also, the torque is higher on 93 octane but HP way less than their pre-LCI flash tune.

Anyone got more info or have thoughts on this and what it means/how it compares?

choppedliver · 11-02-2021, 07:58 PM

Quote:

Originally Posted by Boosted_8

Did another experiment tonight, traction off and brake boost with no LC. Squeaked out a cheeky ten second run! 60ft and 0-60 are slower but the gears hold till redline so the 1/4 mile is faster. If the gearbox when using LC behaved correctly, on a prepped track this thing is running 10.8 or less.

Nice work!!!!

choppedliver · 11-02-2021, 07:59 PM

Quote:

Originally Posted by crypto

Interesting. I hadn't heard about this…but also feel a bit ignorant to what this actually means. The pre-LCI offerings are "Smooth Power Flash Stage 1 software" and claim to get the car to 698 flywheel HP / 702 flywheel lb/ft torque.

Where this LCI offer (where they don't have a flash available) is.. "Performance Controller Stage 1" that is a plug and play ECU that gets LCI models to 637 hp/717 torque.

I don't know where this fits exactly compared to a flash tune and a piggy back. Seems it's neither.. are they saying it replaces your ECU? Also, the torque is higher on 93 octane but HP way less than their pre-LCI flash tune.

Anyone got more info or have thoughts on this and what it means/how it compares?

There is allegedly some 2021 tuners that have cracked the ECU. I can't recall the name but was mentioned in the M5 forums.

I think the carbahn thing is a piggyback like the JB4.

jmhildreth · 11-03-2021, 01:16 PM

Quote:

Originally Posted by choppedliver

There is allegedly some 2021 tuners that have cracked the ECU. I can't recall the name but was mentioned in the M5 forums.

I think the carbahn thing is a piggyback like the JB4.

I didn't realize the JB4 would work with a 2021. I guess previous comments about the ECU being locked by BMW don't apply to these gizmos.

Boosted_8 · 11-04-2021, 11:04 AM

Piggys like JB4 and racechip work fine, they are post ECU intercept.

G35c6MT · 11-04-2021, 06:45 PM

C&D retested the M550i:

https://www.caranddriver.com/news/a3...leration-test/

Brucelinc · 11-04-2021, 08:38 PM

Quote:

Originally Posted by G35c6MT

C&D retested the M550i:

https://www.caranddriver.com/news/a3...leration-test/

Excellent! I have been looking forward to seeing results with the update.

PaLaKaT · 11-04-2021, 08:51 PM

Anyone tried the xHp tcu tune? They said they support g30 now!

SomaM550i · 11-04-2021, 10:23 PM

Quote:

Originally Posted by G35c6MT

C&D retested the M550i:

https://www.caranddriver.com/news/a3...leration-test/

wowwww, this is awesome news. Does anyone know if the '22 comes with the issue already updated? Mine is in "paint" now...

Boosted_8 · 11-05-2021, 05:20 AM

Quote:

Originally Posted by Boosted_8

Regarding the G80 on a roll. The internet tells me they are covering 100-200kms in high 7s to low 8s range. I recorded my M550i stock as 8.3s.

Updated my 100-200 with JB4 map6:

mylife98 · 11-07-2021, 01:00 PM

Reading through, current status looks like:
-BMW has the software fix for performance
- doesn't appear to be available over the air yet, dealer only
- can someone who's done the dealer upgrade tell me: can you see/tell by version number somewhere if the update has been applied?

Thanks,

choppedliver · 11-19-2021, 12:04 AM

Quote:

Originally Posted by jmhildreth

I see Carbahn has a controller for the 2021 M550ix.

https://carbahnautoworks.com/product...-m550i-xdrive/

Is this the first and only tuning available for the 2021's?

I saw some posts on the M5 forums and the wisdom their is that the carbahn box is a rebadged racechip.

10-31-2021, 04:40 AM	#837
Boosted_8 Captain 436 Rep 749 Posts Drives: M550i Join Date: Apr 2021 Location: UK iTrader: (0)	You could well be right DB_BMW. The other possibility is that the LC program allows additional boost and therefore torque to build and remain held vs just brake boost W/ LC off. I suspect the TCU tune for LCI models is probably a while off as it’s only niche Russian outfits I can see offering much.
	Appreciate 0 Quote

11-02-2021, 02:12 PM	#838
jmhildreth Enlisted Member 3 Rep 30 Posts Drives: BMW M550i xdrive Join Date: Jan 2021 Location: USA iTrader: (0)	Carbahn Controller for 2021 M550ix. I see Carbahn has a controller for the 2021 M550ix. https://carbahnautoworks.com/product...-m550i-xdrive/ Is this the first and only tuning available for the 2021's?
	Appreciate 0 Quote

11-02-2021, 05:39 PM	#839
Boosted_8 Captain 436 Rep 749 Posts Drives: M550i Join Date: Apr 2021 Location: UK iTrader: (0)	Did another experiment tonight, traction off and brake boost with no LC. Squeaked out a cheeky ten second run! 60ft and 0-60 are slower but the gears hold till redline so the 1/4 mile is faster. If the gearbox when using LC behaved correctly, on a prepped track this thing is running 10.8 or less. Attached Images
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11-04-2021, 11:04 AM	#844
Boosted_8 Captain 436 Rep 749 Posts Drives: M550i Join Date: Apr 2021 Location: UK iTrader: (0)	Piggys like JB4 and racechip work fine, they are post ECU intercept.
	Appreciate 0 Quote

11-04-2021, 06:45 PM	#845
G35c6MT Private First Class 160 Rep 110 Posts Drives: i5 M60 Join Date: Feb 2021 Location: Chi iTrader: (0)	C&D retested the M550i: https://www.caranddriver.com/news/a3...leration-test/
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11-04-2021, 08:51 PM	#847
PaLaKaT Private First Class 71 Rep 185 Posts Drives: 2022 X6M Join Date: Oct 2013 Location: New Jersey iTrader: (0) Garage List 2019 BMW M5 Competi ... [0.00] 2019 BMW 740i xDrive [0.00]	Anyone tried the xHp tcu tune? They said they support g30 now!
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11-07-2021, 01:00 PM	#850
mylife98 New Member 22 Rep 29 Posts Drives: 2021 M550i Join Date: Nov 2021 Location: NM iTrader: (0)	Reading through, current status looks like: -BMW has the software fix for performance - doesn't appear to be available over the air yet, dealer only - can someone who's done the dealer upgrade tell me: can you see/tell by version number somewhere if the update has been applied? Thanks,
	Appreciate 0 Quote