[leftcoastman]

I was talking to another 6MT owner who swears by a brake torquing technique similar to what the Steptronic guys use.

He pulls the parking brake, slips the clutch and lets the turbos spool up before launching. Is this something that is commonplace in the 6MT drag racing world? Do you guys do it? Walked U?

[RRGOO7]

never heard of pulling the ebrake on launching a manual

[CASHBY]

NO!

here is the thing with turbo cars... if you just sit there and hold the throttle at lets say 3000 rpms... the turbo will stop spooling if it is not under load.

you have to blip the throtle back and forth to keep the turbo spooling for a good launch and then launch it on the upswing when its boosting... once we get launch control it will be great for us 6mt guys!

[musc]

Originally Posted by CEA 3

NO!

here is the thing with turbo cars... if you just sit there and hold the throttle at lets say 3000 rpms... the turbo will stop spooling if it is not under load.

you have to blip the throtle back and forth to keep the turbo spooling for a good launch and then launch it on the upswing when its boosting... once we get launch control it will be great for us 6mt guys!

+1

Thats the big advantage of the AT. I think maxboost got up to 2600 rpm with the tranny going into 2nd at 2700. I am not sure what his boost readings were at launch. 1.67 60fts are pretty good for a car like the 335i.

Like CEA said, If you blip the throttle with the MT it will help, otherwise you wont maintain the boost. The launch control will be a great add on for the MT guys. It should help the launch tremendously. Its not really necessary for the AT, nor do I see how its applicable, considering you'd really have to change out the valve body.

[A418t81]

Thats one of the worst ideas I've ever heard and a true sign of somebody who doesn't know what they are doing.

[Walked U]

Ya dont brake torque with a 6mt.

If your clutch is in all the way while hovering @ a certain rpm your making 0 boost.

Like charlie said you have to be under load to make boost.

You have to do an upswing launch to create boost on a launch with a turbo car.

A 2 step (launch control) should fix that problem if anyone offers it in the future.

I personally dont do upswing launches on the 335i since it hits max torque pretty quickly.

Holding the ebrake while putting the car under load would just put way too much stress on the car.

[3X5PSI]

Hey I use that technique & ran a 1.9 60ft like that. Clutch a bit out & rev to like 2700 with e-brake up. The car is almost "spring loaded" & when the light goes out I release the e-brake & feed the power in one fluid motion & the car jumps off the line like a scalded cat. If you get it wrong you do smell the clutch tho.

[BMWPower06]

How is the Launch Control going to work for 6MT 335s?

[RaptorKTM]

yea the best way is to just blip the throttle then drop the clutch while on the upswing. luckily you guys can mess up without much damage. i mean worst case senario is your burn out bad. unless you just launch completly wrong you could burn up the clutch. but i mean ive seen lots of crazy shit with rwd and the clutchs do just fine. but not like AWD audis that suffer from the fact that when rwd messes up all the wear goes on the tires, in AWD that wear goes straight to the clutch.

[leftcoastman]

Originally Posted by CEA 3

NO!

here is the thing with turbo cars... if you just sit there and hold the throttle at lets say 3000 rpms... the turbo will stop spooling if it is not under load.

you have to blip the throtle back and forth to keep the turbo spooling for a good launch and then launch it on the upswing when its boosting... once we get launch control it will be great for us 6mt guys!

I think you guys are misunderstanding me. If you ebrake and slip the clutch, you are actually putting a load on the engine.

That will mean that the turbos will spool up, just like in an auto.

The blipping throttle does not work well very well. You can verify that by looking at your MAP readings from the PROcede serial port.

I have never tried it but the guy who does it gets drag strip verified 1/4 mile times of 13.1 at around 109 mph with a stick......at over 5000 ft elevation. Bone stock with Procede. I looked at his PROcede data and while he shifts reasonably fast (0.25-0.4), he is absolutely kicking ass despite having density altitudes of over 7000-8000 ft.

[E90Russ]

What is this launch control thing you guys are talking about? Something BMW will offer on future models, or an aftermarket part?

[Coldintake]

Originally Posted by BMWPower06

How is the Launch Control going to work for 6MT 335s?

+1... I fail to see how it'll be done... Unless you swap your transmission for something SMG-esq.

[533ogetnom]

... you guys dont do this? pull the ebrake all the way out, press the regular brake really hard too and slowly let the clutch out while giving it about 3/4 gas

you should be able to sit there like that and hold the RPMs steady at ~3k then just let go off the brakes and you will fly



sound really retarded? thats because it is

[Sniz]

So you got the 3rd leg/foot mod as well

Originally Posted by 533ogetnom

... you guys dont do this? pull the ebrake all the way out, press the regular brake really hard too and slowly let the clutch out while giving it about 3/4 gas

you should be able to sit there like that and hold the RPMs steady at ~3k then just let go off the brakes and you will fly



sound really retarded? thats because it is

[leftcoastman]

You cannot argue with his ET and trap speed - with a 6MT at 7k-8k density altitude.

It's also exactly the same as brake torquing an auto. You prevent the car from moving and you spool up the turbos by applying load (slipping the torque converter in the the auto, the clutch in the MT).

It may sound retarded, but apparently it is effective. I'm no dragster, but I challenge any of you to head up to 7000-8000 density altitude and try to beat his time/trap. Takers?

[Ryan(e92)]

bone stock with procede is not bone stock. You see bone stock means you have NO mods. Bone stock is how it comes from the factory. ( I cant beleive I have to explain this)

[leftcoastman]

Originally Posted by Ryan(e92)

bone stock with procede is not bone stock. You see bone stock means you have NO mods. Bone stock is how it comes from the factory. ( I cant beleive I have to explain this)

Having a rough day?



Imprecise languaging is different than lack of understanding.

[Jean@ActiveAutowerke]

Having launch control on a 6MT will require a stationary rev limiter. So as long as the car is going 0 mph the rev limiter will be xxxx or 3k. But that is just used as launch control wont build boost. Because there is no load.

Then there is anti lag which will allow you to build boost at a complete stop. Very common on drag cars as well as rally cars. There are two different types of anti lag as well.
With other cars it can be had with just an after market EMS or with certain hardware that comes in certain stock cars. (none in the states that i know about)

[BMWPower06]

^^ ok cause i was wondering y people were saying u could build boost with LC, it wasnt making sense

[533ogetnom]

Originally Posted by Sniz

So you got the 3rd leg/foot mod as well

wow you lose 2 points:

1 because it was obviously a joke

and another because you dont realize that its possible to, and that any enthusiast does often; apply the same foot to both the brake and the gas