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      07-24-2014, 12:06 AM   #1
Shaung
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Not enough tire for my brake setup

Hey guys and gals.

Had my E92 M3 out at the Ridge last weekend and experienced something new. My current setup is this, Dunlop Direzza-2 235/35/18 front 275/35/18 rear. Lowered with springs. StopTech St40's with PF 8 pads.

When I'm getting the brakes really hard it feels like the front tires are sliding, not skidding but sliding. I don't think the ABS is coming on (I'm not sure if the car shows the ABS light) but it feels like the tires are sliding and offering very little control. I've gone to the track for over 14 years in all kinds of cars but never had that kind of feeling. I drove my E46 with a very similar setup (PF 06 pads, race fluid) for years at the track and never felt anything like it.

Question: Is it the fact that the E92 is heavy and I'm running a tiny front tire with an aggressive pad setup or is it the tire itself? I'm getting another tire setup soon but was just wondering if it was a characteristic of the Direzza tire, the tire size etc.

Thanks

Last edited by Shaung; 07-24-2014 at 12:15 AM.
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      07-24-2014, 12:12 AM   #2
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I would agree with your assessment. I too just felt this is my e46. I felt like I was dragging rears into the corner. I'm on nt01s and have cobalt xr2. Stepping up to hankook c51. Your set up seems more mismatched than mine.
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      07-24-2014, 07:18 AM   #3
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235 up front? Is that a typo?
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      07-24-2014, 09:30 AM   #4
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Too tiny of a tire. I run that in the winter with Blizzaks and the OEM brakes are too much...though more of an ABS issue.

In summer, I run 275 RS3s up front and don't have any issues with OEM brakes.
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      07-24-2014, 12:09 PM   #5
Shaung
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Quote:
Originally Posted by tdott View Post
235 up front? Is that a typo?
Yeah I know. I purchased those tires for a Z4 M Coupe and after spending a month sorting out a wheel wobble issue with a previous setup of wheels was not in the mood to even get remotely close to a rub or any other problems.

But I'm over that and am going bigger for sure.
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      07-24-2014, 12:13 PM   #6
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Quote:
Originally Posted by tdott View Post
235 up front? Is that a typo?
Ah missed that. Thought it was a mistake also.
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      08-02-2014, 06:44 AM   #7
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Quote:
Originally Posted by Shaung View Post
Hey guys and gals.

Had my E92 M3 out at the Ridge last weekend and experienced something new. My current setup is this, Dunlop Direzza-2 235/35/18 front 275/35/18 rear. Lowered with springs. StopTech St40's with PF 8 pads.

When I'm getting the brakes really hard it feels like the front tires are sliding, not skidding but sliding. I don't think the ABS is coming on (I'm not sure if the car shows the ABS light) but it feels like the tires are sliding and offering very little control. I've gone to the track for over 14 years in all kinds of cars but never had that kind of feeling. I drove my E46 with a very similar setup (PF 06 pads, race fluid) for years at the track and never felt anything like it.

Question: Is it the fact that the E92 is heavy and I'm running a tiny front tire with an aggressive pad setup or is it the tire itself? I'm getting another tire setup soon but was just wondering if it was a characteristic of the Direzza tire, the tire size etc.

Thanks
Totally the wrong tire set-up for a track. Just curious as to why you went with narrower than stock front tire? You want at a minimum 255 up front with rear 275, if not a square 275 set-up. You have not only decreased front end grip but simutaneously increased understeer.
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Last edited by LarThaL; 08-02-2014 at 07:22 AM.
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      08-02-2014, 08:14 AM   #8
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Yes, Stoptech fronts with race pads will overpower stock front tires, and certainly anything even narrower.

I've had a difficult time in the past properly bedding my race pads with stock wheel/tire setup and street tires. They have a tendency to slide after only a few hard stops.

As others have mentioned, consider a square 275 setup w/ aggressive tire for the track. Helps in a variety of ways, including balancing the brake power.
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      08-02-2014, 05:18 PM   #9
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Quote:
Originally Posted by LarThaL View Post
Totally the wrong tire set-up for a track. Just curious as to why you went with narrower than stock front tire? You want at a minimum 255 up front with rear 275, if not a square 275 set-up. You have not only decreased front end grip but simutaneously increased understeer.
Those tires and wheels were bought for my Z4M coupe. Later traded the Z4m in for the M3. Since the Dunlops had all of one track day on them I decide to keep using them with the M3.
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      08-03-2014, 12:36 AM   #10
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I just upgraded to some apex wheels and 265 tires and will be at the track in 2 weeks.
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      08-03-2014, 01:20 AM   #11
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What tires?

Understeer is a common problem in our cars. In my experience the fattest tire you can fit in the front nets the best results in the E9x M3. My JRZ setup allows me to run 295/30/18 in the front. Turn-in is incredible and braking is formidable (on Hankook TD's).

If you're running RS3's, you can most likely fit the 275 in the front.
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      08-03-2014, 01:57 AM   #12
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RS3's. My cars is lowered on springs with no camber plates. So, I decided to go with a 265 instead of a 275.

295 up front? Wow, that's a huge tire.
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      08-03-2014, 02:11 AM   #13
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Op, are you going on 15th or/and 16th?
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      08-03-2014, 02:20 AM   #14
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I'm planning on both days, if my bank account can take it.
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