12-27-2018, 11:42 PM | #1 |
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RC tune map 6 for wheel spin control
I have tried map 7 for several hundreds miles. The increased pull was quite enjoyable but wheel spin in LC was hard to eliminate for launch.
To reduce wheel spin, I tried few rounds this afternoon with dropping to map 6 coupled with releasing brake early to keep rpm under 3k. Wheel spin issue got much better. 1/4 mile was 10.77. I didn’t measure it with stock form but my previous ride (18 e63s wagon) was 11.18. Both cars’ acceleration are similar (I prefer the senseasion with M5 though). So I guess the improvement is around 0.41 which I am very happy with just a chip tune. In addition, it was the first time 60-130 under 8 seconds and 0-130 under 11 seconds as well. All these numbers are slow compared to superb record of 6.16 on 60-130 in earlier post. My take is that, if F90 engine could take that much more stress, RC map 6 or 7 should be safe for long haul...... Mine is around 650 miles with map 6 and 7 combined. Hope it will remain running fine when summer arrives. |
12-28-2018, 01:42 AM | #2 |
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I had exactly the same problem
The fix: New wheels and tires need to be put in place. Planning forged wheels ( saves about 50lbs of unsprung weight ) 20/10 front and 20/11 back with 285 front 305 back, plus ( the big impact ) low treadwear tires Problems solved, first it will look better and perform better
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12-28-2018, 10:18 AM | #4 |
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nice runs!!! Imagine map 7 with some grip.
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12-28-2018, 10:05 PM | #5 | |
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My 6.90 was from 10.77 for 1/4 mile (2.72 0-60 mph with one foot roll). How can their f90 in stock form ran 6.88? Either they were on downhill section or the measuring device was a bit off? |
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12-28-2018, 10:28 PM | #6 |
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The current P zero are good tires but it wears out fairly fast. My first two e63 were both RWD. They came with P zero and rear tires went bold after 6k miles. Switching to pilot sport and felt improvement on both grip and wear.
Since I run sport 4WD 90% of time with F90. I am quite surprised that rear tires still have around 60% of tread at the moment (just over 6600 miles). I feel there is some grip lost on rear tires recently. Not sure was it due to winter temperature/rain or was it really loosing grip. I am tempting to replace rear tires with Pilot Sport soon (need to burn some tread with 2WD first to justify......). I think it should help me to run map 7 without early release on brake to fully take advantage of extra pull. Last edited by MV99; 12-28-2018 at 10:33 PM.. Reason: Typo |
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12-29-2018, 12:34 AM | #7 | |
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curious too
b
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12-29-2018, 12:35 AM | #8 | |
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curious too
curious about that too, i thought i read that the quarter mile was 10.5 cause they said its faster than 911 turbos s
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12-29-2018, 09:36 AM | #9 | |
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12-29-2018, 05:39 PM | #10 | |
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** your 100-200 is 6.69 (map 7 and assumed 93 fuel) and mine is 6.90 (map 6 and 91 fuel). ** I had one 7.55 record with stock form. The improvement was 0.65 second compared to theirs (0.65) and yours (0.60). ** I actually verified with stopwatch and their 6.88 and 6.22 were surprisingly accurate and if 6.88 in stock form is correct, it means they had a stock f90 could achieve 10.75 for quarter mile which indicates the test section must be slightly downhill...........or, f90 runs little faster at home......... |
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12-29-2018, 06:16 PM | #11 | |
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12-29-2018, 09:06 PM | #12 | ||
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12-30-2018, 09:30 PM | #13 | |
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The straight section was kind of short so only measured 0-60 with map 6 and no early releasing brake. Tried twice and both time were under 3 seconds. There was only tiny bit of wheel spin. With RC tune, this new gen of M5 indeed a wonderful rocket. It makes privious E63s wagon look slow...... Just got home and turned on map 7. Will try it again when temperature is warm. Last edited by MV99; 12-30-2018 at 09:44 PM.. |
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