[Max Well]

With appreciation to Imran@Evolve for sharing his 1/4 mile data. I compiled the numbers from the first 5 stock runs (before the beta Eventuri intakes were installed) and placed next to the top 8 runs from our Stock X3MC category found in the F97/98 !/4 mile thread [ https://x3.xbimmers.com/forums/showthread.php?t=1444613 ].

Results as predicted but interesting to see actual data showing how 'Cd x A' (and weight) can influence interval times in vehicles with otherwise similar engines. Suspect the AWD may run in the 11.3xx range?

Edit 6 Jul 2021 – I appreciate Imran’s PM discussions in which he shared formal drag slip data for his 5 stock runs, the actual DA, his octane rating and his tire psi (OEM standard rec). This has improved the analysis so I’ve replaced the preliminary spreadsheet with this final version.

Would be interesting to also add formal slips from a stock X5MC as suspect it should be very close to these ETs. A rather unique collection of vehicle styles and sizes to run such similar fast times.

[Remonster]

Originally Posted by McLaren720s

I believe TheStraightPipes were told by BMW engineers at a driving event that for best results Launch Control should be held for another 3 seconds or so after it says "Launch Control Active" as it takes a bit to build full boost.

Not sure what kind of difference this will really make if any, but I intend to find out once my car is broken-in and go to the drag strip.

If my memory is correct, that Straight Pipes video was of an earlier generation that didn't have the two stage launch control message.

The G80 is building boost until it says "launch control ready" and after the ready message comes up, it has reached whatever boost level they target for the launch and you need to launch within 5 seconds or the system will disengage to prevent excess heat and wear from having the system loaded up for too long.

[SickGTR]

Originally Posted by Remonster

If my memory is correct, that Straight Pipes video was of an earlier generation that didn't have the two stage launch control message.

The G80 is building boost until it says "launch control ready" and after the ready message comes up, it has reached whatever boost level they target for the launch and you need to launch within 5 seconds or the system will disengage to prevent excess heat and wear from having the system loaded up for too long.

I feel if BMW has a set boost for Launch control, that data has to be out there?

[PLife]

If awd launches it first gear i think you might be able to get better times if the brake is released during the “preparing launch control” message due to hooking up better.

[SickGTR]

Originally Posted by PLife

If awd launches it first gear i think you might be able to get better times if the brake is released during the “preparing launch control” message due to hooking up better.

I don't think you will be worrying about traction with the AWD at only 500 HP. Unless the boost is some crazy number on the launch which I highly doubt!!

[Vic55]

Originally Posted by SickGTR

I don't think you will be worrying about traction with the AWD at only 500 HP. Unless the boost is some crazy number on the launch which I highly doubt!!

Yes, no issues with a piggy tuned F90 or my F93 on a warm set of tires which has much more hp and tq than an OEM AWD G8X.

The AWD system from BMW is really good and arguably better than my departed E63S with 4Matic Plus.

[TexasEd]

Originally Posted by SickGTR

Could make sense. I never use to hold long on the GTR. Floor it, ramp right to 4500 RPM and go! Could be a safety thing on the BMW so some idiot can't just sit there with the car loaded up

I have a GTR as well as my M4 Competition. With the GTR in Launch Control one has only 3-4 seconds to launch. If one does not launch within that time frame the launch control function shuts down as a safety precaution regarding the DCT transmission clutch overheating. I learned while at the drag strip to let the other guy stage first therefore I did not have to stay in launch control too long.

[SickGTR]

Originally Posted by TexasEd

I have a GTR as well as my M4 Competition. With the GTR in Launch Control one has only 3-4 seconds to launch. If one does not launch within that time frame the launch control function shuts down as a safety precaution regarding the DCT transmission clutch overheating. I learned while at the drag strip to let the other guy stage first therefore I did not have to stay in launch control too long.

100% Always stage 2nd. If not, you are done

[SickGTR]

Originally Posted by Vic55

Yes, no issues with a piggy tuned F90 or my F93 on a warm set of tires which has much more hp and tq than an OEM AWD G8X.

The AWD system from BMW is really good and arguably better than my departed E63S with 4Matic Plus.

Yes sir. If anyone has worries, get the R888's and be done with it!!! When those things are warmed up, it's STICKY