01-10-2024, 09:57 AM | #397 | |
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I'd say it depends on your driving style--if you're still working on not over driving the fronts and are a bit shy with the throttle, stay with 20mm stagger. If you're good at managing and driving to and not over front grip limits, and like to be more aggressive with the throttle and a tiny bit of oversteer/rotation doesn't bother you, try 30mm stagger--it will be slightly faster. I once ran 265/305 R7's, and that setup has so much grip, especially coming off the corners! But, it was a bear to drive. You had to be so diligent with your driving to not overwork the fronts b/c of how much it shifted the balance of the car. Never again! What you really want is four wheel drift coming in and out the corners. That is best managed with a 20mm stagger and why I run 18x10 & 18x10.5 275/295. Best setup I've ran on the car, yet, and you'll get a similar F/R balance feel with 255/275. Last edited by ZM2; 01-10-2024 at 10:02 AM.. |
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01-10-2024, 12:46 PM | #398 | |
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01-10-2024, 12:57 PM | #399 |
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I haven't. That'd require some modifications I'm not willing to do since my car is primarily a daily driver. 275/295 bolts on without issue.
If you have the suspension upgrades and setup to make the car neutral on 295 square it'd be quicker than 275/295. Would be interesting to do back-to-back tests to know by how much and how the balance feels b/n the two setups. |
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01-10-2024, 01:26 PM | #400 | |
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There is no other configuration that works better than this one on the f87. Ad09 285/30 on 10.5: ![]() ![]() Last edited by Track/S; 01-10-2024 at 01:40 PM.. |
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01-10-2024, 06:08 PM | #401 | |
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My roads are a little too crappy for 30-series, so stuck with 275/295/35 for the street, as well. |
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01-10-2024, 08:34 PM | #402 |
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Admittedly I'm smitten with the 295 square setup. I wanted to prefer the stock staggered setup on the street because BMW designed it that way and I'm an enthusiast, but the 295 setup feels safer and much more confidence inspiring in DD and track. The added front grip suits my ogerish style of driving.
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01-10-2024, 11:41 PM | #403 | |
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The cost of 285/30 size is 160$, therefore they have no rival. |
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01-11-2024, 03:31 AM | #404 |
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01-11-2024, 06:52 AM | #405 | |
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BMW didn't design any variant of the road F87 to be a true track car. The road cars are supposed to be playful and fun. |
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01-11-2024, 07:14 AM | #406 |
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The ~$5k to get to a forged wheel 275 square setup + larger sway bar might not be worth it right now. Perhaps money is better spent keeping my existing 19x9.5/10.5 and spending $1500 on 255/275 35/19 RE-71RS setup and work on not overdriving the fronts.
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01-11-2024, 08:27 AM | #407 | |
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And, even tho I just spent two days at Portimao (right before Verstappen was there, hah!) testing the new M4 GT4 with the Euro GT4 champ and managed to get within 1.8s of his best time on a 2-minute track that I've never been to and in a car I've never driven, I'm guilty of leaning on more grip and aero to cover up mistakes. His skills allowing him to drive that car like a mix b/n a Miata and an indoor kart to maximize available grip is what let him snag a tenth of a second in each corner to pull away from me over the lap (that's all it takes, 0.1s each corner to smoke your competition and old self!). It was amazing to behold, but it is his day job! ![]() Separately, the unboosted brakes in the M4 GT4 are gnarly! You have to hit the pedal with 120-bar of force if you want maximum decel. Even all my cycling was worn out after two days. Loved that car tho, so balanced--even got to where I was perfectly comfortable driving it with TC off! Last edited by ZM2; 01-11-2024 at 08:41 AM.. |
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01-11-2024, 10:31 AM | #408 | |
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I have bought 4 more in case they are going to raise the price
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They do not come close either braking or turning or coming exit of corners. Last edited by Track/S; 01-11-2024 at 01:22 PM.. |
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01-11-2024, 02:49 PM | #409 |
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I think bang for buck, just getting a set of 10 inch Apex wheels and running 275 square RE71RS, NT01s or similar will wear better and be faster overall than forged wheels and a square setup. Unless you're competing for tenths, I don't think truly forged wheels are worth the $, and I'm not sure why you think a sway bar is needed. A better investment would be adjustable coilovers like the Ohlins R&T or Bilstein PSS10
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01-11-2024, 03:00 PM | #411 | |
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Getting Apex EC-7 18x10 ET33 would save about $1300 from that package, but that is still $3700 vs $1500 for just tires on my existing wheels. Aside from the unsprung mass, the forged wheels are stronger, and I would be more resistant to cracks when hitting curbs. I am considering a larger sway bar because I significantly increase front-end grip (1in wider wheel, 35mm wider tire). A larger front bar would decrease body roll due to the increased grip. How would you compare 255/275 + coilovers against a 275 square forged + large front bar?
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01-11-2024, 03:36 PM | #412 | |
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I have PSS10 and run them 3/10 on the street, 5-7/10 depending on the track, no front sway bar and I have no desire to add one. The PSS10s keep the car flat enough without changing sway bars while still allowing to drive over curbs, and are excellent on track. Being able to adjust them on a lowered car with big rubber without needing to take the wheels off is a bonus. Last edited by ZM2; 01-11-2024 at 03:47 PM.. |
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01-17-2024, 03:48 PM | #413 | |
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If you're running coil overs, you'll want to up the spring rate before you start adding swaybars, and if you have adjustable shocks, the range they work is wider than something like my PSS system. With both (and I've only run my car with the M235i stock stagger) You can expect a square setup to be more neutral.
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01-27-2024, 02:55 AM | #414 |
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Planning to make custom wheels and would like to minimise on the use of spacers. Folks running on 295/30/R18 square can chip in on the F/R wheel width/ET/Spacers?
Just curious as well, did anyone manage to fit 295/35 R18 on their front? |
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01-29-2024, 01:19 AM | #415 |
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Food for thought here - I've seen some insanely fast TA times run on 275/40R18 square setup on a F80 with super 200s (CR-S). Not sure if that side profile will work in front on F87 but worth a try if it does.
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01-29-2024, 05:53 AM | #416 | |
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Interesting to note! Somethings get better, some get worst, with a 40 vs 35. Maybe the higher load rating allowed the tire pressures to go lower without ruining response or rolling the side wall and result in better grip.
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01-29-2024, 11:15 AM | #417 |
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Yup - loss in acceleration but gain in speed carried thru corners. I think seeing it first hand also made me realize that you can run reasonable sizes and still be extremely fast.
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01-31-2024, 05:55 PM | #418 |
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Good article at GRM about RE-71RS & RT660 performance as they wear: https://grassrootsmotorsports.com/ar...d-longer-life/
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