Traction light

Mmedeiros · 09-22-2022, 10:00 AM

Hello I my old tire setup was 265/35/19 on a 9.5in in the front and 295/35/19 on a 11in in the rear.

I just replaced my rear tires to a 305/30/19 same wheels and left the same front tires on.

When I am taking and exit going like 40 around the corner the traction like flashes on and is slowing down the car no clue why when the tire diameter is closer now then it was before. Does anyone have any clue If there is something I need to reset to change the tire size or any info will help.

The car is fine driving straight or taking a normal corner on the road just taking exits it's kicking on. I just mounted the tires yesterday.

WordOnRoad · 09-22-2022, 10:07 AM

Having the same situation with my F80. Same rear tire spec.

Mmedeiros · 09-22-2022, 10:46 AM

Quote:

Originally Posted by WordOnRoad

Having the same situation with my F80. Same rear tire spec.

Have you found any luck? What was your tire size before?

WordOnRoad · 09-22-2022, 11:10 AM

OEM 275 on 437M.

TopJimmy · 09-23-2022, 08:21 AM

I run 265/35/19 with 325/30/19 no probs.
Which tires?

Send a PM over to SignatureWheelBMW and ask if they've heard of this before or a known fix. I'm leaning towards an iffy wheel speed sensor, or maybe a software bug, but that's just my guessing.

rborane · 09-23-2022, 10:12 AM

The problem is your now running front and rear tires that have the same exact diameter (26.3"). DSC was calibrated for the OEM stagger which is 26" and 26.6" rear. Your previous setup using a 295/35 in the rear was staggered front and rear and much closer to the OEM difference.

WordOnRoad · 09-23-2022, 10:20 AM

Quote:

Originally Posted by WordOnRoad

Having the same situation with my F80. Same rear tire spec.

Sorry, my tires are 18s, not 19s.

Quote:

Originally Posted by TopJimmy

I run 265/35/19 with 325/30/19 no probs.
Which tires?

Send a PM over to SignatureWheelBMW and ask if they've heard of this before or a known fix. I'm leaning towards an iffy wheel speed sensor, or maybe a software bug, but that's just my guessing.

Traction alerts are usually paired with ABS alerts and are triggered much easier and stay present. At least that has been my experience.

Kilabyte · 09-23-2022, 11:58 AM

Quote:

Originally Posted by rborane

The problem is your now running front and rear tires that have the same exact diameter (26.3"). DSC was calibrated for the OEM stagger which is 26" and 26.6" rear. Your previous setup using a 295/35 in the rear was staggered front and rear and much closer to the OEM difference.

Agreed. Front to rear ratio got changed, computer is freaking out.

krudmunk · 09-23-2022, 12:28 PM

295/35 is taller than OEM so you did not see difference. But 305/30 is like 3% shorter than OEM so traction control is freaking out and cuts power early.

You can flash with the euro MDM or drive without traction control at all or live with TC light coming on here and there.

TopJimmy · 09-23-2022, 12:44 PM

Quote:

Originally Posted by krudmunk

295/35 is taller than OEM so you did not see difference. But 305/30 is like 3% shorter than OEM so traction control is freaking out and cuts power early.

You can flash with the euro MDM or drive without traction control at all or live with TC light coming on here and there.

I didn't know that Euro MDM calmed down TC for tire sizing. I did have Euro MDM coded in.

Mmedeiros · 09-28-2022, 08:52 PM

Quote:

Originally Posted by krudmunk

295/35 is taller than OEM so you did not see difference. But 305/30 is like 3% shorter than OEM so traction control is freaking out and cuts power early.

You can flash with the euro MDM or drive without traction control at all or live with TC light coming on here and there.

What is euro mdm? I've seen people talk about it but what is it really and do you have a link?

09-22-2022, 10:00 AM	#1
Mmedeiros New Member 2 Rep 15 Posts Drives: Bmw m4 Join Date: Oct 2020 Location: Massachusetts iTrader: (0)	Traction light Hello I my old tire setup was 265/35/19 on a 9.5in in the front and 295/35/19 on a 11in in the rear. I just replaced my rear tires to a 305/30/19 same wheels and left the same front tires on. When I am taking and exit going like 40 around the corner the traction like flashes on and is slowing down the car no clue why when the tire diameter is closer now then it was before. Does anyone have any clue If there is something I need to reset to change the tire size or any info will help. The car is fine driving straight or taking a normal corner on the road just taking exits it's kicking on. I just mounted the tires yesterday.
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09-22-2022, 10:07 AM	#2
WordOnRoad Captain 313 Rep 659 Posts Drives: E70/F80 Join Date: Aug 2015 Location: Boston iTrader: (4)	Having the same situation with my F80. Same rear tire spec. __________________ Winter: 13 PGM 3.5 E70\|MHD Summer: 15 6MT BSM F80\|MHD\|KW\|SM-10 Gone: 09 AWD 6MT AW E90\|FBO\|MHD\|XHP\|KW\|ARC-8 IG: 475_f80
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09-22-2022, 11:10 AM	#4
WordOnRoad Captain 313 Rep 659 Posts Drives: E70/F80 Join Date: Aug 2015 Location: Boston iTrader: (4)	OEM 275 on 437M. __________________ Winter: 13 PGM 3.5 E70\|MHD Summer: 15 6MT BSM F80\|MHD\|KW\|SM-10 Gone: 09 AWD 6MT AW E90\|FBO\|MHD\|XHP\|KW\|ARC-8 IG: 475_f80
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09-23-2022, 08:21 AM	#5
TopJimmy Major General 5450 Rep 5,143 Posts Drives: 2023 M3 Comp xDrive Join Date: Jul 2019 Location: Chester County, PA iTrader: (5)	I run 265/35/19 with 325/30/19 no probs. Which tires? Send a PM over to SignatureWheelBMW and ask if they've heard of this before or a known fix. I'm leaning towards an iffy wheel speed sensor, or maybe a software bug, but that's just my guessing. __________________ '18 F80 Base 6MT \| '19 F82 Exec DCT \| '18 F82 Comp Exec DCT \| '23 G80cx
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09-23-2022, 10:12 AM	#6
rborane Captain 241 Rep 792 Posts Drives: BMW M4 Join Date: Mar 2013 Location: AZ iTrader: (3)	The problem is your now running front and rear tires that have the same exact diameter (26.3"). DSC was calibrated for the OEM stagger which is 26" and 26.6" rear. Your previous setup using a 295/35 in the rear was staggered front and rear and much closer to the OEM difference.
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09-23-2022, 12:28 PM	#9
krudmunk Captain 340 Rep 813 Posts Drives: F80 M3 Join Date: Apr 2020 Location: San Francisco iTrader: (3)	295/35 is taller than OEM so you did not see difference. But 305/30 is like 3% shorter than OEM so traction control is freaking out and cuts power early. You can flash with the euro MDM or drive without traction control at all or live with TC light coming on here and there.
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