[mattsfeir]

Originally Posted by mykal335xi

2nd gear isn't a good idea for longevity on a stock trans with more than 370whp IMO, but every now and then it should handle it fine and if it isn't then something in the drivetrain is giving way.

I was thinking about it, and before I had the trans replaced I remember brake boost slipping and free revving also, so the component at fault must not be the trans or torque converter. The only other component would be the transfer case, I don't know a lot about them but does it make sense for a worn transfer case to slip like that?

Any updates on this? My car was doing this at the track this past weekend, now my 60's are in the 2.1-2.2 range instead of 1.7-1.8. Car drives fine on the street, checked the AT fluid level and it's fine, so I'm guessing transfer case also.

Car has seen less than 15 brake boost launches since I've had it, was stock when I bought it, so doubt prior owner had Procede launch control.

[amclint]

Originally Posted by mattsfeir

Any updates on this? My car was doing this at the track this past weekend, now my 60's are in the 2.1-2.2 range instead of 1.7-1.8. Car drives fine on the street, checked the AT fluid level and it's fine, so I'm guessing transfer case also.

Car has seen less than 15 brake boost launches since I've had it, was stock when I bought it, so doubt prior owner had Procede launch control.

I have no issues at all from first, even doing a low 1.6x 60' which felt really violent had no slipping. 2nd gear I don't try anymore as it's just not worth the trouble to me to gain .1 on ET.

Are you saying this happens to you in 1st gear? I personally think my issue is related to the transfer case, but if you're seeing it in 1st then it could be low fluid in the transfer case or diffs. Quick test is to pull the fuse and make it RWD, then see if it does it and that will isolate it a bit more.

[mattsfeir]

Yes, my car does this in M1, then it clunks and shifts into M2. I replaced both F&R diff fluid a few weeks ago, so I know that's not an issue. I haven't brake boosted since being at the track last August, so no idea when this issue started happening.

I do have replacement transfer case fluid, just haven't gotten around to changing it out. Will also try pulling the fuse and see what happens.

Is your car AT or MT?

[amclint]

Originally Posted by mattsfeir

Yes, my car does this in M1, then it clunks and shifts into M2. I replaced both F&R diff fluid a few weeks ago, so I know that's not an issue. I haven't brake boosted since being at the track last August, so no idea when this issue started happening.

I do have replacement transfer case fluid, just haven't gotten around to changing it out. Will also try pulling the fuse and see what happens.

Is your car AT or MT?

I'm an AT and no issues in M1 ever, but do get a slight clunk when taking off in M2 at full power.

[Quebequer]

Originally Posted by mykal335xi

Quick test is to pull the fuse and make it RWD, then see if it does it and that will isolate it a bit more.

Witch fuse is this?

No problem with mine yet, 50k miles, all fluids just changed for redline oil, car is FBO no meth and just runs smooth. I'd just be interested in that fuse cause I'd like to see what it is in RWD mode.
Also interested in this tread as I'm planning on going meth, so I'll keep you updated for any trouble with my drivetrain.

[runthis]

Originally Posted by Beemw335

Fbo is fine on x drive, add meth and your transfer case will blow, only a matter of time.

I have FBO+RB's and meth and I haven't had any issues at all...

[amclint]

Originally Posted by Quebequer

Witch fuse is this?

No problem with mine yet, 50k miles, all fluids just changed for redline oil, car is FBO no meth and just runs smooth. I'd just be interested in that fuse cause I'd like to see what it is in RWD mode.
Also interested in this tread as I'm planning on going meth, so I'll keep you updated for any trouble with my drivetrain.

There is a thread about it in the XI section, I think it's 26, I also pull the wiper block because the wipers going all the time is annoying.

[Quebequer]

Originally Posted by mykal335xi

There is a thread about it in the XI section, I think it's 26, I also pull the wiper block because the wipers going all the time is annoying.

Interesting, thanks

[Ferruccio]

An update,

I'm getting my xDrive the Vishnu/FFTEC e85 kit. Right now, we discovered that the fuel pump was getting pretty old, and cannot handle the e85 fuel flow, so I will be getting the LPFP replaced in a couple of days. Given the power and torque it's already measuring at the wheels, I will try to keep everyone updated with data points. I do not do hard launches from standstill, though. I will probably never be out to record a fast 0-60 time. I just don't like what it does to the drivetrain. I'm in it for those intense surges once I *am* in gear

I'm not giving any numbers, yet, until everything's all squared away. Right now, it's not really a controlled experiment, since it was done with worn out parts

[ManoB1]

I have an 08 335xi sedan 6mt with 37,000 miles and has been FBO since 5k miles....I have heard alot of talk about launching the xi and chirping the tires.....I have never been able to launch and chirp anything. There is never an tire slippage...so i tried dumping the clutch from high rpm ranges like 4-5k rpms and when doing so it doesnt even catch gear....itll just rev at 4k and ill let go of the clutch and the car wont move and the rev will stay at 4k....i guess this means the clutch is slipping but i have no problem shifting quickly or any other type of clutch problems....any ideas why i cant launmch like everyone else says they can??


the other question i had was about the transfer case....what is it ....where is it....last time i checked i was putting down 380-390 at the wheels on a mustang dyno....this is before rev.2.5 and E85...so i would assume im in the 420-430 range...do i have any worries....i have had lots of issues with bushing replacements....

[Carl Morris]

You need a stronger clutch. Mine used to spin the tires at the track, but now does the same thing yours does. I'll get a new one next spring assuming my stock one makes it through the winter OK.

I don't know about the transfer case. Mine has been fine so far.

[Slops]

We are looking to rebuild the TC with stronger parts if we can get enough interest.

Please contribute to the good cause.
http://www.e90post.com/forums/showthread.php?t=727970&page=4

[DarkAsNight]

Originally Posted by Slopp

We are looking to rebuild the TC with stronger parts if we can get enough interest.

Please contribute to the good cause.
http://www.e90post.com/forums/showth...=727970&page=4

I'm interested I am now getting nervous about the power levels I am looking to achieve in this car.

[whiteCanadian335xi]

So I plan to get FBO with Meth but I don't track my car as is and I wont launch would my TC or anything else in the car be safe?? I currently have Jb4+DCI and Ordering DP this week then FMIC and then Meth. I just want to be safe and blow nothing im already pretty high though about 55,000K I have a 08 335xi E92 AT.

[bmwm3redblack]

I've got 2008 335xi coupe 6spm and i'm fbo+e85. Once after 3 hard launches from 4000rpm my flywheel beagan to chunk, so i stopped the car turned of the ignition waited for 30 min, and then started the car and it was allright again.
So my point is you shouldn't launcg the car violently for 3-4 times in a row. You can do it 1-2 times then you need to make the things cool down

[nailer335]

Originally Posted by whiteCanadian335xi

So I plan to get FBO with Meth but I don't track my car as is and I wont launch would my TC or anything else in the car be safe?? I currently have Jb4+DCI and Ordering DP this week then FMIC and then Meth. I just want to be safe and blow nothing im already pretty high though about 55,000K I have a 08 335xi E92 AT.

Safe is a conservative flash and FBO at moderate boost levels. I don't know that many would consider meth "safe". Many have used meth aggressively without breaking things... Sometimes things break, sometimes they don't. "YMMV" applies well here. Understand what you're doing, understand the risks and make choices and be prepared for possible consequences. Do research. Log lots, specifically more aggressive settings. Have fun

[jpsimon]

I've put 104k miles and counting on my XI, never had to change any AWD components

[whiteCanadian335xi]

Originally Posted by nailer335

Safe is a conservative flash and FBO at moderate boost levels. I don't know that many would consider meth "safe". Many have used meth aggressively without breaking things... Sometimes things break, sometimes they don't. "YMMV" applies well here. Understand what you're doing, understand the risks and make choices and be prepared for possible consequences. Do research. Log lots, specifically more aggressive settings. Have fun

I don't know how to log yet I might just stick with the DP and FMIC and see how that goes... But meth gives soooo much more power I don't plan to track or launch my car or anything just DD.

[WedgePerformance]

Originally Posted by jpsimon

I've put 104k miles and counting on my XI, never had to change any AWD components

Need to drive it harder.

[135Pats]

Originally Posted by whiteCanadian335xi

I don't know how to log yet I might just stick with the DP and FMIC and see how that goes... But meth gives soooo much more power I don't plan to track or launch my car or anything just DD.

Logging via Cobb is easy, no biggie at all.


If you're concerned about meth run some corn fuel. "Safer" and still provides a really efficient and cool burn. Won't help you on the IAT side but you can hush the IAT comp tables.

[whiteCanadian335xi]

Originally Posted by 135Pats

Logging via Cobb is easy, no biggie at all.


If you're concerned about meth run some corn fuel. "Safer" and still provides a really efficient and cool burn. Won't help you on the IAT side but you can hush the IAT comp tables.

Yeah my buddy has his Evo cobbed and it seems easy enough most likely the same process im guessing. But I have a JB4 though.. LOL corn fuel might work... hahahahaha jkjk.