02-09-2019, 10:35 PM | #1 |
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Toyo square set up
Can I run toyo r888r 285/35/20 on all 4 wheels?
Have trouble getting grip on all 4 at the dragstrip with launch. Best time was 10.9 at 128mph. Will this setup give better 1/4 mile time than stock Michelin? I have racechip and car spins at launch. |
02-09-2019, 10:51 PM | #2 |
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I am running a 285/35/20 square set up for winter. No problems, feel super solid.
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02-10-2019, 08:55 AM | #5 |
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02-10-2019, 11:20 AM | #9 | |
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So in reality you are off by .7% from stock
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02-10-2019, 11:22 AM | #10 |
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Not on stock rims , you should do different rim size. I got mine ordered 10" wide up front and 11" wide in the back
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02-10-2019, 11:50 PM | #11 |
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A factory option for winters is 265/40r19 and 285/40r20. So running 285/35r20 and 305/35r20 is absolutely fine for the transfer case.
Next, the stock wheels are 9.5" and 10.5" wide. The R888R 285/35r20 can run on 9.5" to 11" and the 305/35r20 is rated for 10" to 12" So there is absolutely no problems at all running those sizes.
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02-11-2019, 10:00 AM | #12 | |
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03-31-2019, 09:48 PM | #13 |
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Fits fine on OEM wheels. No spacers. No rubbing.
These were my favorite track tires on my GT-R before I traded it in on this M5. Strangely enough, the rear tire is also the EXACT same size as the rear tire on the GT-R, 2009-present. The GT-R world has a LOT of experience matching the front and rear tires. The GT-R's transfer case will basically self destruct at high power of the front/rear outer diameter is a bad match. But sizes are basically unreliable. Either square or a rollout is required to be absolutely certain. Even though the outer diameter is SLIGHTLY different on square tires on different width rims (OEM's are different in this M5), it was not different enough on the GT-R to blow the transfer case and the front rim and rear rim were a full inch different. So this should be fine. My testing so far is perfect. But I take it to track next week. Here ya go... |
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04-01-2019, 10:33 AM | #14 |
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04-14-2019, 07:35 AM | #15 |
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They did pretty well on the track, but heated up a great deal from cold temps and were hard to predict final pressures.
They also got pretty greasy when they got hot... Like this... But this is heavy duty track work at VIR. Not your normal driving. Shawn |
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04-17-2019, 06:05 AM | #16 | |
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Also, did you change to SRF and how did rotors and pads fare? What other street or track cars did you surprise at VIR with your M5? |
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04-17-2019, 12:25 PM | #17 | ||
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All in all, if I were going to do just track work extensively, I'd stick with the R888's, but I have about six events per year. Unless the Pilot Sport Cup's outperform the R888's on overheating I will probably go back to the stock tire. Despite having A LOT of rollover and giving up a fair amount of grip, they are very controllable and pretty fast. I did change to SRF. The pedal still faded some, but I think we have "brake fade compensation". I felt the car correct some of the pedal height while braking. The front pads last six full track days without making the wear sensors. I have now worn OUT, two full sets of rear pads. On my third set, I turned off DSC to conserve pads. The car is pretty good without DSC, and not as hard to control as I thought it might be. The biggest surprise was probably to the Porsche cayman's. I think they were surprised that I was able to not only keep up but pass. Especially in the turns. But I was in some really fast groups. Shawn |
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04-18-2019, 06:08 AM | #18 | |
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BTW, VIR long back straight should have had you passing more than just Caymans. I enjoy surprising lots 911s and Caymans including GTS and 4, with M3 CP so hoping M5C will be same or better. Especially our tracks with longer straights like Daytona and Sebring where 600+ hp comes in handy. |
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04-18-2019, 06:41 AM | #19 | ||
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And yes I have steel. My GT-R ate two full sets of carbon ceramics which was a very expensive event. Back and front straight of VIR have me moving on for sure, 160 on the back straight. In lower hpde I pass everything, but my last event was Audi club open track (only solo advanced drivers), and most of those cars are on slicks and very hard to close enough in the uphill eases and oak tree to make the pass before the braking zone. While VIR is a power track, the lighting lap times show the twisties make up a lot of ground for any lighter cars. This was borne out my last event. A NSX was very hard to keep up with, and I only passed him because he wanted to follow my line. All in all, the fastest sedan I've ever driven. The fastest sedan at VIR in the lightning lap ever. But there are faster cars, just not ones you can take the family on vacation in. Shawn |
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04-18-2019, 08:53 AM | #20 |
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