[alextremo]

Question for Shiv - How do 6AT launch control and progressive methanol mapping work together?

Do you build enough boost using launch control that meth starts spraying and you're transitioned to map 2 before launch?

[OpenFlash]

Originally Posted by alextremo

Question for Shiv - How do 6AT launch control and progressive methanol mapping work together?

Do you build enough boost using launch control that meth starts spraying and you're transitioned to map 2 before launch?

They work completely independent of each other. Usually, the start psi on the meth controller (10-11psi) is higher than the boost you build during 6AT procede launch (6-7psi). If you built more boost for some reason or have your max psi on your meth controller (or injection mode setting) set low enough, meth can start flowing during launch as well. Which means you could certainly transition towards map2. No issuye either way.

Shiv

[Sniz]

has anyone looked into a higher stall converter for these cars? Possible? Is there even one used lol.

could make for some serious axle bustings launches.

[OpenFlash]

Originally Posted by Sniz

has anyone looked into a higher stall converter for these cars? Possible? Is there even one used lol.

could make for some serious axle bustings launches.

If you tried our 6AT launch control function with fully warm slicks, you wouldn't want a higher stall converter. It will already cut 1.5-1.6s 60' times with the two foot to the floor method

[Bimmer This]

I gotta try this launch control thing out! I usually averaged a 2.0.

[jpsimon]

How exactly does the 6AT launch control work? Hold down on the brake, floor it for 2 seconds then take your foot off the brake?

[OpenFlash]

Originally Posted by Bimmer This

I gotta try this launch control thing out! I usually averaged a 2.0.

You'll need drag radials/slicks to take advantage of it though. Without them, you'll just spin your tires and cut a slow 60'.

[Irishace]

This is a nifty feature indeed.

[Sniz]

Originally Posted by shiv@vishnu

If you tried our 6AT launch control function with fully warm slicks, you wouldn't want a higher stall converter. It will already cut 1.5-1.6s 60' times with the two foot to the floor method

couldnt hurt!! a 4,000rpm launch w heated slicks and LSD would be amazing. The 6MT gang COULD make that happen once in a blue moon, but the AT guys could nail a fast 1.4 or something crazy like that.

what rpms will the AT launch at anyway?

example of high RPM turbo launch w a AT...filmed this at MIR last year.

[jpsimon]

Originally Posted by Sniz

couldnt hurt!! a 4,000rpm launch w heated slicks and LSD would be amazing. The 6MT gang COULD make that happen once in a blue moon, but the AT guys could nail a fast 1.4 or something crazy like that.

what rpms will the AT launch at anyway?

I can launch at 5000 rpms with no issues

[OpenFlash]

Originally Posted by Sniz

couldnt hurt!! a 4,000rpm launch w heated slicks and LSD would be amazing. The 6MT gang COULD make that happen once in a blue moon, but the AT guys could nail a fast 1.4 or something crazy like that.

what rpms will the AT launch at anyway?

Somewhere around 2700rpm, give or take. It's been a while since I used the feature myself, being a 6MT owner

[timtech]

Originally Posted by shiv@vishnu

You'll need drag radials/slicks to take advantage of it though. Without them, you'll just spin your tires and cut a slow 60'.

I haven't tried launch control on my XI yet. I'm assuming you turn off all traction control, put the shifter in DS, pump and hold the brake, then put the gas to the floor. Does it build to a certain boost point at that time?

I usually turn off DTC, pump brake and move gas pedal down to ~3,500 rpms. Even at my 1.8 second launches, it gets you pretty light headed.

[Sniz]

Originally Posted by jpsimon

I can launch at 5000 rpms with no issues

oh yeah?? Video

Id like to see a xi cut a 1.5 or under at the strip.


I want to see a n54 powered car launch like this one day.....Donovan is the man. You can see a typical 335 launch in the other lane, at least for a split second then its out of the frame.

[OpenFlash]

Originally Posted by timtech

I haven't tried launch control on my XI yet. I'm assuming you turn off all traction control, put the shifter in DS, pump and hold the brake, then put the gas to the floor. Does it build to a certain boost point at that time?

That is exactly the procedure. You do this once you see the first yellow light light up. When the green light turns on, you let go of the brake and the car goes like stink.

Again, you need FULLY WARM drag tires to be able to put all that power to the ground. For those who haven't used this feature, you'll be shocked at how much power your car can make right off the line.

Shiv

[jpsimon]

I launched around 5k in that video I posted the other day:

Originally Posted by Sniz

oh yeah?? Video

[Belarus]

Originally Posted by shiv@vishnu

Somewhere around 2700rpm, give or take. It's been a while since I used the feature myself, being a 6MT owner

Is it preset or can it be adjusted, e.g. 2,000 or 2,400 RPM ?

[alextremo]

Originally Posted by shiv@vishnu

They work completely independent of each other. Usually, the start psi on the meth controller (10-11psi) is higher than the boost you build during 6AT procede launch (6-7psi). If you built more boost for some reason or have your max psi on your meth controller (or injection mode setting) set low enough, meth can start flowing during launch as well. Which means you could certainly transition towards map2. No issuye either way.

Shiv

My controller is set to start spraying ~7psi and I think I remember datalogging almost 10psi using boost control at launch, so I should be transitioned to map 2 at or soon after launch. Looking forward to trying this again in the fall!

[hun77777]

Originally Posted by shiv@vishnu

You'll need drag radials/slicks to take advantage of it though. Without them, you'll just spin your tires and cut a slow 60'.

exactly. i tried launch control with street tires, it was uber fail, even slower than 2000 rpm launch. with proper tire setup, it will be worth it i guess...

[alextremo]

Originally Posted by hun77777

exactly. i tried launch control with street tires, it was uber fail, even slower than 2000 rpm launch. with proper tire setup, it will be worth it i guess...

or AWD

[OpenFlash]

Originally Posted by Belarus

Is it preset or can it be adjusted, e.g. 2,000 or 2,400 RPM ?

Not yet. But you will soon be able to adjust torque (through timing retard and boost target) at launch.

[Bimmer This]

Originally Posted by shiv@vishnu

You'll need drag radials/slicks to take advantage of it though. Without them, you'll just spin your tires and cut a slow 60'.

Shiv, you don't even think it would hook up with nitto nt555R's on the sticky track?