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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 07-12-2014, 08:18 PM   #1
Ramseyd
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This issue

Hello so I've been having an issue ever sense I've gotten new wheels and tires. I have 18x9 fronts with 225's and very meaty rear tires 275/40s on a 18x10. My problem is (smg) when I first start my car up to drive as soon as I let off the gas it will drop in rev and if I hit the gas it will shoot back up. I can still shift and all and I've found that if I do a smg reset (holding paddles) then everything will be perfect no issues after that. I don't see why it would be tires but it all started after I got these. Also thinking maybe wheel speed sensors?
Any help would be great thanks!
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Old 07-12-2014, 08:29 PM   #2
Rob43
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I'm not an M3 expert, nor did you list your Exact tires sizes, but my first thought is what's the outside diameter of your F&R tires ? They can't be to far off from one to the other.


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Old 07-13-2014, 01:17 AM   #3
Ramseyd
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I'm not an M3 expert, nor did you list your Exact tires sizes, but my first thought is what's the outside diameter of your F&R tires ? They can't be to far off from one to the other.





Rob43

Front tires 225,35,18
Rear tires 275,40,18

Ok that makes sense, why is that though? And do you think a slightly bigger front tire would set it right?


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Old 07-13-2014, 02:08 AM   #4
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Front tires 225,35,18
Rear tires 275,40,18

Ok that makes sense, why is that though? And do you think a slightly bigger front tire would set it right?

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I've never run into this issue, because I run a square wheel & tire setup. But I'm pretty sure I'm correct about this size difference. I think the rulel of thumb is that the F&R tire diameter needs to be within 1 inch.

2.3 inches is a Huge difference between F&R, I'm fairly certain this messes with the ECU.

225/35-18 = 24.2"

275/40-18 = 26.5"


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Old 07-13-2014, 02:33 AM   #5
Ramseyd
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Originally Posted by Rob43 View Post
I've never run into this issue, because I run a square wheel & tire setup. But I'm pretty sure I'm correct about this size difference. I think the rulel of thumb is that the F&R tire diameter needs to be within 1 inch.



2.3 inches is a Huge difference between F&R, I'm fairly certain this messes with the ECU.



225/35-18 = 24.2"



275/40-18 = 26.5"





Good luck,

Rob43

Ok thanks a lot I will try a bigger front tire


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Old 07-13-2014, 07:57 PM   #6
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Correct me if i'm wrong but shouldn't you be 225/40/18 fronts and 275/35/18 rears
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Old 07-13-2014, 08:03 PM   #7
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Correct me if i'm wrong but shouldn't you be 225/40/18 fronts and 275/35/18 rears

Not sure why would that be? Look fine how it is just big rears, I'm going to put my bigger front tires on this weekend so they be within the diameter range said above and see how that works.


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Old 07-14-2014, 09:03 AM   #8
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Stock size is 225-45/18 in front and 255 40/18 in the back, so I think you need to do the math to determine what aspect ratio in front is needed to keep the difference in circumference front to back close to standard.

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Old 07-14-2014, 02:28 PM   #9
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I'm running 235F and 295R due to when I bought the car. 295's were installed on my rear??? But I never had issues. I reseted the tire button once and that was it. No problems so far. :-)


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Old 07-15-2014, 05:48 PM   #10
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It's not the width that's the issue, it's the rolling circumference. That's what needs to match/be close. Otherwise your DSC thinks the wheels are slipping.
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Old 07-16-2014, 08:46 AM   #11
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You can figure the circumference of each wheel/tire package by remembering your grade school math. Circumference is equal to diameter times pi. To determine diameter, you need to convert the measured diameter of your wheel from inches into millimeters (approximately 25.4 mm per inch), figure the height of your tire by multiplying the section width (which is in millimeters) by the aspect ratio, and then double it. The diameter of your package will then be the wheel diameter plus two times the section height. Multiply this by pi (3.14) and you have your circumference. Yes, I know that the actual circumference on the road will be affected by sidewall compression, but that variation will be minimal when comparing 2 wheel/tire packages, and it is the difference between the 2 that should interest you.
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