11-09-2020, 04:00 PM | #1 |
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Launching car without wheel hop
Here's my set up to get started
2015 M235 Rwd 6MT 19x9.5 rear wheels 265/30/19 r888r tires Big Boost 3.3 turbo kit Dorch HPFP Stage 3 LPFP BMP port injection About 620-650whp (have not dynoed yet) M performance diff H&R lowering springs Boost by gear through mhd 1st gear reduced to 40% power I've tried launching from a dig multiple ways Preset launch control in sport + - just bogs and sometimes stalls out DSC completely off and launch around 4-4500k rpms and wheel hop and spin the tires I've tried heating the tires up with a Burnout before and no help. I even put some track prep down and nothing. I'm trying to find the easiest solution to get a good hard launch without building my whole rear end. I will be getting 17x9 rear wheels with a slick Maybe that will fix the issue? Please shed any light on this situation so I can take peoples money on the streets. |
11-23-2020, 03:32 AM | #2 |
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Do you have oem clutch ?
How much air pressure on front and rear ? Picture of the car and use a dragy for measure your 60ft, 1/8 and 1/4 if you are going to run on street I will go with Nitto 555RII.
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15 BMW M4 Full Weight 10.69@133mph stock turbos SOLD 18 BMW M2LPower 9.69@147.4mph 1.66 60ft michelin 4s tires instagram @luchocampusano YouTube Lucho Campusano |
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11-23-2020, 05:54 AM | #3 | |
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Normal psi in tires Didn't use a draggy cause no point if I can't launch correctly Nittos are better than r888's? I've heard the opposite For pics intstagram @stock235_ |
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11-23-2020, 12:10 PM | #4 | |
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It may be time to widebody. |
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11-24-2020, 02:41 AM | #5 | |
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try front 36psi and rear 24psi if you could not measure (dragy or track print) it is impossible to improve. I said for street Nittto 555RII is a drag radial tire. R888r is a good circuit track that could also perform well from stand but it needs higher temp to operate. follow me on instagram : luchocampusano
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13 BMW 335ix Full Weight 10.64 @129mph N55 WR SOLD
15 BMW M4 Full Weight 10.69@133mph stock turbos SOLD 18 BMW M2LPower 9.69@147.4mph 1.66 60ft michelin 4s tires instagram @luchocampusano YouTube Lucho Campusano |
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12-23-2020, 08:25 PM | #6 | ||
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Thinking abt doing a 15" conversion in rear with a weld and slick |
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12-24-2020, 04:25 PM | #7 | |
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Fill your tires to the pressure you want. Then run a TPMS 'reset' from iDrive. The system will learn the current tire pressure, 24psi in your example, and then use that pressure as the new baseline to work against. The TPMS system is not looking for an absolute pressure. It's looking for a pressure drop from the pressure that it starts at. I'm not sure if it's a percentage, or a specific PSI drop that it will trigger a 'low pressure' warning on. (I've read both ways, but nothing official.) When tracking my car, I'll set a starting pressure of ~26 PSI, and set the TPMS to that. End up with a hot pressure around ~35 PSI. Never alerts. And even when overnight cold temps mean ~22PSI leaving the hotel in the morning, still no alerts, because the pressure hasn't dropped significantly from the new ~26 PSI baseline. |
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12-25-2020, 08:29 AM | #8 | |
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12-25-2020, 09:52 AM | #9 | ||
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Generally, it took a long time passing 50%, 60%, etc. and frequently came back with the message telling me my pressures were too low and to add air and try again. Sometimes it reset as expected, I'd turn the car off, and when it was restarted the car no longer liked the pressures. Every once in a while, it worked as it was supposed to. I went out most of the time with the system still resetting. Occasionally, exiting the hot pits I'd look down and see the display telling me I was limited to 80 MPH. That never turned out to be true. I wonder now if I just shouldn't have had the TPMS sensors yanked and TPMS coded off. I have no idea if that would have worked and wouldn't be surprised to learn that the car couldn't be driven without sensors or a TPMS seen to be working.
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2017 M240i: 23.8K, 28.9 mpg, MT, Sunroof Delete, 3,432#, EB, Leather, Driving Assistance Package, Heated Front Seats | Sold: E12 530i, E24 M635CSi, E39 520i, E30 325is, E36 M3 (2)
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12-26-2020, 09:55 AM | #10 |
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Damn - that was sounding easy - I guess too easy. For now I just wait and refill some air at the end of the day. Then I end up bleeding off air the first couple of sessions to get to a steady range of c. 37 hot. Even if it would improve pressures on that first session, I think I'd rather sneak up on it vs. heading out that low - it would freak me out to head up the S's at even 70mph with only 23# in the tires on that first cold lap.
You could always try what Honda people call the 'tube trick'. for whatever reason, the process to reset new tpms after a wheel swap is so technically challenging that even the dealership gets it wrong half the time. So they register 4 tpms units, then put them into a piece of pipe with a tire valve in the cap and pressurize it. |
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12-26-2020, 02:49 PM | #11 |
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FWIW, my initial pressure settings on 255 R888Rs ranged from 29.0 LF to 30.5 RR with a target hot psi of 39.0 for all four.
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2017 M240i: 23.8K, 28.9 mpg, MT, Sunroof Delete, 3,432#, EB, Leather, Driving Assistance Package, Heated Front Seats | Sold: E12 530i, E24 M635CSi, E39 520i, E30 325is, E36 M3 (2)
TC Kline Coilovers; H&R Front Bar; Wavetrac; Al Subframe Bushings; 18X9/9½ ARC-8s; 255/35-18 PS4S (4); Dinan Elite V2 & CAI; MPerf Orange BBK; Schroth Quick Fit Pro; GTechniq Crystal Serum Ultra Ceramic; Suntek PPF |
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