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      06-01-2017, 02:27 AM   #1
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Best way to launch with AT xi?

I'm wondering what people have found to be the best method for launching to get the best quarter mile time.

1. Launching in Sport mode
2. Launching in Manual mode starting in 1st gear
3. Launching in Manual mode starting in 2nd gear

I know a lot of people with RWD launch in 2nd for traction issues but I don't seem to run into any traction issues with my XI even upgraded turbos. Thanks
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      06-01-2017, 09:34 AM   #2
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Manual, 1st Gear, Brake Boosting - not the best for your transmission or drivetrain though. Oh and get ready to shift and turn off traction control.
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      06-01-2017, 10:14 AM   #3
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Thanks Jeff. Yeah I tried to launch in Manual mode, 2nd gear, brake boosting but it felt slow. Felt like the tranny was slipping. I wish it shifted faster from 1st to 2nd without the feeling that you get a sudden loss of power between shifts. Shifting in higher gears feels great though.

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Originally Posted by Jeff@TopGearSolutions View Post
Manual, 1st Gear, Brake Boosting - not the best for your transmission or drivetrain though. Oh and get ready to shift and turn off traction control.
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      06-01-2017, 11:16 AM   #4
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Quote:
Originally Posted by JUST8AV8 View Post
Thanks Jeff. Yeah I tried to launch in Manual mode, 2nd gear, brake boosting but it felt slow. Felt like the tranny was slipping. I wish it shifted faster from 1st to 2nd without the feeling that you get a sudden loss of power between shifts. Shifting in higher gears feels great though.
Do you have the Alpina Flash or XHP Trans Flash?

My 1-2 shift is lightning fast compared to stock, was on Alpina and now I'm using Stage 3 XHP.

If your tranny is slipping, I'd change the fluid and mechatronic sleeve ASAP & I wouldn't plan on doing any more launches if you want to extend the life of it.
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      06-01-2017, 12:25 PM   #5
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Quote:
Originally Posted by JUST8AV8 View Post
Thanks Jeff. Yeah I tried to launch in Manual mode, 2nd gear, brake boosting but it felt slow. Felt like the tranny was slipping. I wish it shifted faster from 1st to 2nd without the feeling that you get a sudden loss of power between shifts. Shifting in higher gears feels great though.
I found shifting 1 to 2 around 5.5k and the rest of the gears around 6k worked the best for me. The Alpina Flash shifts fast, but the rpm's moves fast too. So if you shift when the needle is at 5.5k, it ends up a little after 6k when it really shifts (maybe my shifting hand is slow). If you look at the torque curve of a FBO with stock turbos, you want to keep the rpm's low.
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      06-02-2017, 06:46 AM   #6
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Quote:
Originally Posted by Jeff@TopGearSolutions View Post
Do you have the Alpina Flash or XHP Trans Flash?

My 1-2 shift is lightning fast compared to stock, was on Alpina and now I'm using Stage 3 XHP.

If your tranny is slipping, I'd change the fluid and mechatronic sleeve ASAP & I wouldn't plan on doing any more launches if you want to extend the life of it.
How does the xHP Stage 3 compare to the Alpina? I can't seem to find a good comparison. I've got the Alpina now and am happy with it (and it's free).

Thanks!
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      06-02-2017, 01:18 PM   #7
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I was running the alpina but switched to xhp stage 3. I've been using xhp stage 3 since it was first released. Using version 2.1 right now.

I only have 48k miles on my car. Do you think I need to change the trans fluid and mechantronic sleeve already?

It only felt like it was slipping that one time I brake boosted and launched in 2nd gear(manual mode).


Quote:
Originally Posted by Jeff@TopGearSolutions View Post
Do you have the Alpina Flash or XHP Trans Flash?

My 1-2 shift is lightning fast compared to stock, was on Alpina and now I'm using Stage 3 XHP.

If your tranny is slipping, I'd change the fluid and mechatronic sleeve ASAP & I wouldn't plan on doing any more launches if you want to extend the life of it.
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Last edited by JUST8AV8; 06-02-2017 at 01:29 PM.
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      06-02-2017, 01:20 PM   #8
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I like it better. D mode is definitely better and it seems to shift a tad faster than alpina and definitely downshifts a lot faster.

Quote:
Originally Posted by HydroStream6 View Post
How does the xHP Stage 3 compare to the Alpina? I can't seem to find a good comparison. I've got the Alpina now and am happy with it (and it's free).

Thanks!
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      06-02-2017, 01:22 PM   #9
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Quote:
Originally Posted by Nonecure View Post
I found shifting 1 to 2 around 5.5k and the rest of the gears around 6k worked the best for me. The Alpina Flash shifts fast, but the rpm's moves fast too. So if you shift when the needle is at 5.5k, it ends up a little after 6k when it really shifts (maybe my shifting hand is slow). If you look at the torque curve of a FBO with stock turbos, you want to keep the rpm's low.
Yea first gear comes and goes quick and I had an MT RWD prior which would result in 2nd gear breaking both tires loose no matter what LOL

Quote:
Originally Posted by HydroStream6 View Post
How does the xHP Stage 3 compare to the Alpina? I can't seem to find a good comparison. I've got the Alpina now and am happy with it (and it's free).

Thanks!
It really depends if you find any drawbacks to Alpina. If you don't then it's probably not worth changing. However, if you don't like Drive in Alpina or you want quicker shifts in sport and M mode, XHP may be worth upgrading.

I personally can't stand Drive in Alpina and the shift speed in XHP Stage 3 were noticeable enough for me to justify the purchase.
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      06-04-2017, 09:56 AM   #10
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The stock dme and alpina flash limits torque while brake boosting, th boost wil go to about 2 PSI around half throttle, then if you go above that, the torque limiter kicks in and lowers boost to near zero. It sucks. However, the MHD coupled with the xHP flash turns this off. The car will brake boost to 12-14 PSI and when you launch, its violent. So be careful with it but it squeals the front tires and explodes forward. The newest stage 3 xHP version doesn't work. it shifts into second and third while brake boosting. Use the next to latest version and it's fine.
Best launches I have seen are brake boost to 10 PSI in M1 and shift to 2nd at 5500. The XI will cut a 1.75 and there's more in it but I'm afraid at this level of breaking something.

Last edited by jetdriven; 06-04-2017 at 01:02 PM.
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      06-04-2017, 02:12 PM   #11
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Quote:
Originally Posted by jetdriven View Post
The stock dme and alpina flash limits torque while brake boosting, th boost wil go to about 2 PSI around half throttle, then if you go above that, the torque limiter kicks in and lowers boost to near zero. It sucks. However, the MHD coupled with the xHP flash turns this off. The car will brake boost to 12-14 PSI and when you launch, its violent. So be careful with it but it squeals the front tires and explodes forward. The newest stage 3 xHP version doesn't work. it shifts into second and third while brake boosting. Use the next to latest version and it's fine.
Best launches I have seen are brake boost to 10 PSI in M1 and shift to 2nd at 5500. The XI will cut a 1.75 and there's more in it but I'm afraid at this level of breaking something.
Good to note. I appreciate your feedback and experience.
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      06-05-2017, 09:40 PM   #12
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My method is brake boost in M1 to around 2200 to 2500 and then let the transmission shift by itself from 1st to 2nd. After that I manually shift at 6500.
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      06-14-2017, 02:55 PM   #13
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Quote:
Originally Posted by Jeff@TopGearSolutions View Post
Do you have the Alpina Flash or XHP Trans Flash?

My 1-2 shift is lightning fast compared to stock, was on Alpina and now I'm using Stage 3 XHP.

If your tranny is slipping, I'd change the fluid and mechatronic sleeve ASAP & I wouldn't plan on doing any more launches if you want to extend the life of it.
Jeff, do you recommend replacing the mechatronic sleeve at any point as preventative maintenance? I just passed 100k miles.
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      06-14-2017, 03:01 PM   #14
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Quote:
Originally Posted by JETmn View Post
Jeff, do you recommend replacing the mechatronic sleeve at any point as preventative maintenance? I just passed 100k miles.
Yes, that is likely the most important thing to change aside from the trans fluid itself.
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      06-19-2017, 05:30 PM   #15
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If the CDV on the manual cars is any indication of how the BMW engineers are thinking about the cars, I'd be VERY reluctant to launch one of these without a remapped transmission.

You may want to talk to the guys playing with the transmission tunes to see what the 1st and 2nd gear clutch engagement is programmed to do before you tear your auto up like that.
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      06-23-2017, 10:31 AM   #16
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Quote:
Originally Posted by NiNeTyOne View Post
If the CDV on the manual cars is any indication of how the BMW engineers are thinking about the cars, I'd be VERY reluctant to launch one of these without a remapped transmission.

You may want to talk to the guys playing with the transmission tunes to see what the 1st and 2nd gear clutch engagement is programmed to do before you tear your auto up like that.
CDV was designed to reduce drivetrain shock/smooth engagment at the sacrifice of premature clutch wear.
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      06-23-2017, 03:21 PM   #17
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Quote:
Originally Posted by Jeff@TopGearSolutions View Post
Do you have the Alpina Flash or XHP Trans Flash?

My 1-2 shift is lightning fast compared to stock, was on Alpina and now I'm using Stage 3 XHP.

If your tranny is slipping, I'd change the fluid and mechatronic sleeve ASAP & I wouldn't plan on doing any more launches if you want to extend the life of it.
Is this app only available for android? Im really interested in it.
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      06-23-2017, 11:31 PM   #18
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Pretty sure XHP is only Android.
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      07-04-2017, 12:32 PM   #19
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I'm glad I found this thread. Was actually about to post my own but searched a bit. I just ran my e90 X Drive 6AT a few weeks ago, and could not get a solid 60ft at all. I think my best 60ft was a 2.05 ish.

The car has a Dinan STG 3 tune, Alpina trans flash and BMS filters. I was pretty disappointed because I figured it had a 1.9 60 ft and low 13 second time-slip.

But, ended the night with a 13.6 @ 103 and that 2.05 60ft. I just did sport mode and brake boosted it a good bit. Maybe I was a bit overzealous with a low 13 sec time?
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      07-04-2017, 12:46 PM   #20
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All traction off completely, s1, brake boost at 2500,and take off, let transmission change into 2nd on its own and after that manual shift urself at 5700 2-5th.pulled multiple 1.7 60ft with this setup. Ran 12.2@110 with just jb4 and intakes
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      07-04-2017, 04:53 PM   #21
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Quote:
Originally Posted by Kaoshan View Post
But, ended the night with a 13.6 @ 103 and that 2.05 60ft. I just did sport mode and brake boosted it a good bit. Maybe I was a bit overzealous with a low 13 sec time?
Car should run that bone stock. Are you sure it actually has the Dinan tune?
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      07-10-2017, 01:57 AM   #22
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When i launch from sport mode @~2k rpm the torque dips hard at the end of 1st gear and 60 fts very slightly faster
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