Why no launch control on 6mt???

[Kevin_russian]

Hello there folks!
I'm kind of a noob to tweaking BMW's but I was wondering why no tuner companies make a launch control for 6mt? I've previosly had an Eagle talon 96 tsi awd and the tune I ran offered a launch control for a manual transmission, which allowed me to launch the car with about 10-15 psi of boost off the line( when I was running about 27psi peak at 6500 rpm). I personally found it to be a handy feature.

Any ideas why no one does that to BMW's?

Once again, I apologize for a noob question

[Mr. Nasty]

You dont need a 2-step to properly launch these cars on street tires. On drag radials/slicks it would be useful, but on street tires it would probably just make things harder.

Im sure its on the "to-do" list for most of the companies that offer EM for the N54/N55, but they are working on other features that more people want currently. A lot of 335/135 owners dont even have MT cars. And the number of future MT owners will probably only get smaller with the DCT option in 2011+ cars (that has launch control from the factory).

[rader1]

You make a good point, but imo 6mt is the way to go if you want the funnest driving experience. So it would be nice to see some launch control loving for us with a clutch. Althought launching with street tires and a tune(400lbft or better) may be kinda pointless

[Diver]

6MT has launch control, it's in your feet.

[KingOfJericho]

funnest.

[ESC OFF]

Originally Posted by Diver

6MT has launch control, it's in your feet.

[rader1]

Originally Posted by Diver

6MT has launch control, it's in your feet.

Its not going to build 8 or 10psi just holding the clutch in and revving it

[BrokenVert]

Originally Posted by KingOfJericho

funnest.

Don't be a grammar Nazi because you're gooder than him at English

[mosx]

I can see the need to "build boost" on your Eagle talon because all you were probably running a huge turbo, so all your boost is up top. These engines make maximum torque at a very low RPM thanks to our super tiny turbo's.

[Kevin_russian]

Originally Posted by mosx

I can see the need to "build boost" on your Eagle talon because all you were probably running a huge turbo, so all your boost is up top. These engines make maximum torque at a very low RPM thanks to our super tiny turbo's.

Yep, I was running a 20g turbo on it from a straight truck
Ok, kinda makes sense now.
Just been curious about it. I don't think I would be using it much anyway. I can get my n55 to get off the line pretty quick as it is.
Thanks for all your comments ...

[baylor1er]

If your really worried about launch control, get yourself a line lock, rev in first/second (whatever floats your boat) to 2-3000, release lock, hear those tires squeel.

[RimasRS]

Wait Procede V5 offers 1st gear psi limiter... It's something like launch control, same thing. Again +1 for Procede.

[MrBlonde]

Originally Posted by baylor1er

If your really worried about launch control, get yourself a line lock, rev in first/second (whatever floats your boat) to 2-3000, release lock, hear those tires squeel.

There's no difference in using a line lock that way and just having your brakes on.

I think launch control for 6MT would be a great addition. There's limited understanding her for the difference between launch control, traction control, two step, antilag and it would seem a line locker.

[Freon]

There is plenty of power and torque off the line to spin almost any street tire you'll fit out back. I don't see the point. You do not need to build boost before the green.

If we had a 2.0T running 20psi I could see the need, but the 3.0 I6 TT pushing two wheels just doesn't need it. Or perhaps once you have an LSD and 12" drag slicks, but at that point you need to just buy a Mustang and stop kidding yourself that what you're doing is a good idea.

[Kevin_russian]

Well..., it's not as much about pre-boosting the car, as about just limiting revs at launch for a 6mt. It would be very convenient for 6mt users. Per say you could limit revs at the stand still to let's say 3500 -4000 rpm with pedal all the way down and clutch depressed, so you can just drop it and go IMO it would be very convenient.
I must agree with all of you that it can spin any tires with or without a tune. I currently have n55 jb3 installed and my stock 255 just keep on burning all the way to 4th gear
But still for launching it the right way all the time I think it would be nice to have a feature like that.....

[N55_NOLE]

Originally Posted by MrBlonde

There's no difference in using a line lock that way and just having your brakes on.

I think launch control for 6MT would be a great addition. There's limited understanding her for the difference between launch control, traction control, two step, antilag and it would seem a line locker.

I know the difference between a few of those, but I'm still unclear as to what a two step is or what an antilag does. Perhaps you could explain the differences for us, I'm sure I'm not the only one!

[MrBlonde]

Traction Control: System to detect a wheelspin situation and reduce power momentarily to return the car to improved traction (reduced wheelspin). The method of detecting wheelspin can vary (eg wheelspeed sensors, driveshaft speed). The method of reducing power can vary (eg ignition, fuel, etc). The target wheelspin can be varied too for different situations.

Launch Control: System to move the vehicle from a standstill to maximum acceleration with optimum wheelspin. At a certain point launch control deactivates and traction control kicks in. May use a twostep or secondary revlimiter as part of the syste,

Two Step: A secondary rev limiter used in drag racing. You use this to set a variable secondary RPM limit (not your usual redline or cutout). You can then floor the gas and the engine will sit on your twostep limit. This is used to achieve a consistent launch at your optimum RPM to get out of the hole.

Line Lock: A system that allows you to "pump up" your brakes to achieve a desired line pressure on your front brakes and then hold that pressure with a button or switch. This means you are free to take your right foot off the brake. It also means the rear brakes are not activated. You use a line locker in order to do two things. First to perform a burnout in a relatively low horsepower car by locking the front brakes and allowing the rears to spin in the waterbox. Secondly to bump in to pre-stage or full stage under a controlled situation (with a much lower line pressure).

Anti Lag: System to produce boost at standstill for use in launching at a drag strip.

The basic method of operation is to artificially lower the engine rev limiter to hold the engine at a speed where the turbo can produce useable boost, by altering the ignition. Because the ignition is alternately cut or retarded, there is similar noise and misfires associated with other anti-lag systems. Systems for Two Step launch designed to be fitted in addition to the existing engine management work by interrupting the crank position sensor signal, so that the engine develops a controlled misfire at a pre-determined RPM.

There are other useful tricks too like flat shift and gear dependent boost.

[MrBlonde]

Originally Posted by Mr. Nasty

You dont need a 2-step to properly launch these cars on street tires. On drag radials/slicks it would be useful, but on street tires it would probably just make things harder.

Im sure its on the "to-do" list for most of the companies that offer EM for the N54/N55, but they are working on other features that more people want currently. A lot of 335/135 owners dont even have MT cars. And the number of future MT owners will probably only get smaller with the DCT option in 2011+ cars (that has launch control from the factory).

A twostep would be a useful tool for drag racing even on OEM wheels/tires. It allows you to program in your launch RPMs in advance and know you can launch at exactly that RPM consistently time after time. It also means there is one less thing to think about and get right while you're staged.

There will always be people who want to drive their car through a manual tranny. I'm one of them!

[MrBlonde]

Originally Posted by Diver

6MT has launch control, it's in your feet.

Yes but there are electronic gadgets that can give you a performance advantage in drag racing.

[MrBlonde]

Originally Posted by mosx

I can see the need to "build boost" on your Eagle talon because all you were probably running a huge turbo, so all your boost is up top. These engines make maximum torque at a very low RPM thanks to our super tiny turbo's.

An anti lag setup would be a huge advantage on our cars for drag racing. Having positive boost out of the hole is great no matter what turbos you have.

[MrBlonde]

Originally Posted by baylor1er

If your really worried about launch control, get yourself a line lock, rev in first/second (whatever floats your boat) to 2-3000, release lock, hear those tires squeel.

You would never launch in second gear, that's terrible advice. A line lock does not give you advantages of a two step or anti lag. Or launch control.

[MrBlonde]

Originally Posted by Freon

There is plenty of power and torque off the line to spin almost any street tire you'll fit out back. I don't see the point. You do not need to build boost before the green.

If we had a 2.0T running 20psi I could see the need, but the 3.0 I6 TT pushing two wheels just doesn't need it. Or perhaps once you have an LSD and 12" drag slicks, but at that point you need to just buy a Mustang and stop kidding yourself that what you're doing is a good idea.

You're totally wrong! There is absolutely a need to build boost at a standstill.

If you use your method and I have the identical car, but setup with twostep, anti lag and launch control I will torch you every time. There is no halting the march of technology.

A BMW 135 is a fantastic car for drag racing! You don't know what you're talking about.