2015 M4 - Traction Control ON at cornering after installing 295/30/19 rear tires - Bimmerfest - BMW Forums



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F80/F82/F83 M3 and M4 (2015 - Current)
F80 BMW M3 sedan, F82 BMW M4 coupe and F83 M4 convertible forum. This 5th generation M3 and all new M4 features a 3.0 liter twin turbo engine (engine code S55) 425hp and 406lbs of torque! Heavy use of light weight materials makes this generation lighter and faster then the outgoing E9x M3.

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  #1  
Old 12-07-2019, 04:53 PM
Turbocrazy Turbocrazy is offline
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2015 M4 - Traction Control ON at cornering after installing 295/30/19 rear tires

Guys,

I have a 2015 BMW M4 Base and recently I had to buy new rear tires (common problem of inside edge wear, increased by using lowering springs), but the problem I am experiencing is that after installing these slightly wider and smaller overall diameter tires I see that at cornering with speed BUT not enough for any traction control to happen, it is coming on flashing and applying brakes as the car was really in a low traction condition.

I have tried resetting the TPMS sensors, I aligned the car (to what it can be done I still have -2.3 (red) camber in the rear left, while the right shows -1.7 (green).

Also tires have been driven enough to make sure that any coating is no longer there so they are ready to perform as they should.

Installed tires are Khumo ECSTA ps91 295/30ZR/19

Any advise is appreciated.

Last edited by Turbocrazy; 12-07-2019 at 10:52 PM.
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  #2  
Old 12-10-2019, 08:30 AM
HPIA4v2 HPIA4v2 is offline
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Quote:
Originally Posted by Turbocrazy View Post
Guys,

I have a 2015 BMW M4 Base and recently I had to buy new rear tires (common problem of inside edge wear, increased by using lowering springs), but the problem I am experiencing is that after installing these slightly wider and smaller overall diameter tires I see that at cornering with speed BUT not enough for any traction control to happen, it is coming on flashing and applying brakes as the car was really in a low traction condition.

I have tried resetting the TPMS sensors, I aligned the car (to what it can be done I still have -2.3 (red) camber in the rear left, while the right shows -1.7 (green).

Also tires have been driven enough to make sure that any coating is no longer there so they are ready to perform as they should.

Installed tires are Khumo ECSTA ps91 295/30ZR/19

Any advise is appreciated.
You use OEM setup in the front?
It could be but long shot that your rolling diameter between front to back is out of whack, sending false info that the car is skidding (this is part of ABS sensor in modern car).
The rule of thumb, rolling diameter between front to back should be less than 1%

Or Kumho is just bad tires compare to OEM Michelin
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Old 12-10-2019, 09:19 AM
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Doug Huffman Doug Huffman is online now
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Originally Posted by HPIA4v2 View Post
Or Kumho is just bad tires compare to OEM Michelin
+1. KumHo on a BMW?
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Old 12-10-2019, 11:49 AM
Autoputzer Autoputzer is offline
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Quote:
Originally Posted by Turbocrazy View Post
Guys,

I have a 2015 BMW M4 Base and recently I had to buy new rear tires (common problem of inside edge wear, increased by using lowering springs), but the problem I am experiencing is that after installing these slightly wider and smaller overall diameter tires I see that at cornering with speed BUT not enough for any traction control to happen, it is coming on flashing and applying brakes as the car was really in a low traction condition.

I have tried resetting the TPMS sensors, I aligned the car (to what it can be done I still have -2.3 (red) camber in the rear left, while the right shows -1.7 (green).

Also tires have been driven enough to make sure that any coating is no longer there so they are ready to perform as they should.

Installed tires are Khumo ECSTA ps91 295/30ZR/19

Any advise is appreciated.
The smaller diameter rear tires makes the computer think that the rear tires are slipping. So, the computer takes over and limits power.

A co-worker bought a demonically possessed, used Corvette that wouldn't run right for a song. Once she put the correct size tires on, it ran fine.

The moral to this story is...

"If it ain't broke, don't fix (break) it."
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Old 12-11-2019, 08:15 AM
Turbocrazy Turbocrazy is offline
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Thanks guys,

Yeah, budget and slightly wider was the reason for choosing those.

And yeah, I think the problem is the rolling diameter and now that need to buy fronts will try to "match" them
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Old 12-11-2019, 12:22 PM
glennbaz glennbaz is offline
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Tire size

Here maybe this will help you find the right size.

https://www.miata.net/garage/tirecalc.html
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Old 12-11-2019, 07:54 PM
Turbocrazy Turbocrazy is offline
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Originally Posted by glennbaz View Post
Here maybe this will help you find the right size.

https://www.miata.net/garage/tirecalc.html
Yes it does, thanks!!
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Old 12-11-2019, 09:41 PM
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quackbury quackbury is offline
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So you only put Kumhos on the rear axle? You have a different make, model, compound, load rating and tread design on the front axle? You likely have a different coefficient of friction on the rear vs. the front. A huge no-no. Hopefully you are not tempted to drive that in the rain... You really need to run the same make, model, compound, load rating and tread design on all 4 corners.
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