[xboxgod]

Am I the only one that has a hard time launching this car at the drag strip? What is the secret?!

-Traction control completely off
-Transmission in M2
-Rev to 2000(ish) RPM

This doesn't work for me. After 2-3 seconds, the RPM's fall and my launch is ruined.

[DieselRacer]

Mine takes off like a rocket, 2nd gear manual, I floor it and let it shift from there...

[xboxgod]

Can you hold it at a certain RPM for more than a couple seconds?

[DieselRacer]

Originally Posted by xboxgod

Can you hold it at a certain RPM for more than a couple seconds?

I never tried that...do you have all traction controls off or on... I leave mine on...

[DieselRacer]

TDIwyse would know better he is in the 11's...

[xboxgod]

Originally Posted by DieselRacer

I never tried that...do you have all traction controls off or on... I leave mine on...

What is your 60' when you launch like that?

[dixy2k]

This car does not have a launch control feature.

[TDIwyse]

Originally Posted by xboxgod

Am I the only one that has a hard time launching this car at the drag strip? What is the secret?!

-Traction control completely off
-Transmission in M2
-Rev to 2000(ish) RPM

This doesn't work for me. After 2-3 seconds, the RPM's fall and my launch is ruined.

Uhm ... why are you holding the car for that long at that high of an rpm? That would generate HUGE amounts of heat in your transmission and it may be sending a "panic" warning to the DDE to defuel. I've never wanted to hold the rpm's elevated pre-launch. I try to raise them and launch in one motion to reduce heat buildup.

I've found 2000 rpm is too aggressive for a launch and causes spinning of the tires. Something closer to ~1400-1500 and then easing into the skinny pedal (how soon you can push full fuel will depend on your mods and tires). Some really sticky tires help a lot.

My best 60' time so far was actually using the traction control to help control the torque to the ground. This was in 2nd gear. I haven't fully mastered this yet though ... there's a lot of things going on there at the launch.

[xboxgod]

Originally Posted by TDIwyse

Uhm ... why are you holding the car for that long at that high of an rpm? That would generate HUGE amounts of heat in your transmission and it may be sending a "panic" warning to the DDE to defuel. I've never wanted to hold the rpm's elevated pre-launch. I try to raise them and launch in one motion to reduce heat buildup.

I've found 2000 rpm is too aggressive for a launch and causes spinning of the tires. Something closer to ~1400-1500 and then easing into the skinny pedal (how soon you can push full fuel will depend on your mods and tires). Some really sticky tires help a lot.

My best 60' time so far was actually using the traction control to help control the torque to the ground. This was in 2nd gear. I haven't fully mastered this yet though ... there's a lot of things going on there at the launch.

Ok. That makes sense. I posted when I first got the car and everyone said to launch at 2200 RPM in M2. I believe it was on HotRod's post.

My 60' times are usually from 2.0-2.3 seconds. I don't think a better 60' will get me from 13.9 to 12.9 though. Does meth make that big of a difference?

[DieselRacer]

Originally Posted by xboxgod

Ok. That makes sense. I posted when I first got the car and everyone said to launch at 2200 RPM in M2. I believe it was on HotRod's post.

My 60' times are usually from 2.0-2.3 seconds. I don't think a better 60' will get me from 13.9 to 12.9 though. Does meth make that big of a difference?

Meth for your car, YES, it helps a lot...

[TDIwyse]

So when analyzing data on my car I noticed it will protect itself if temps get too hot (EGT's for example can cause de-fueling... and EGT's can get really hot on a 1/4 mile run). You should really be monitoring how your car behaves under different circumstances to learn how to optimize its performance.

Also, the condition of your DPF and how long its been since its last regen can also significantly impact EGT's on the 1/4 mile pull.

Another thing ... and this one is big ... watch your EGT's at full fueling vs rpm vs hp. The hp curve is pretty flat for a lot of rpm range. Even though you can make nearly the same hp at ~4400 rpms ... the EGT penalty is much higher up there than at the same hp level at ~4000 rpms. You likely won't see this on a quick dyno pull, but on a long 1/4 mile run the impact is big. Monitor what your car does if the EGT's get too high...

Data, data, data...

[TDIwyse]

Originally Posted by DieselRacer

Meth for your car, YES, it helps a lot...

So does the water component. The water can really help control your EGT's.

[DieselRacer]

Originally Posted by TDIwyse

So when analyzing data on my car I noticed it will protect itself if temps get too hot (EGT's for example can cause de-fueling... and EGT's can get really hot on a 1/4 mile run). You should really be monitoring how your car behaves under different circumstances to learn how to optimize its performance.

Also, the condition of your DPF and how long its been since its last regen can also significantly impact EGT's on the 1/4 mile pull.

Another thing ... and this one is big ... watch your EGT's at full fueling vs rpm vs hp. The hp curve is pretty flat for a lot of rpm range. Even though you can make nearly the same hp at ~4400 rpms ... the EGT penalty is much higher up there than at the same hp level at ~4000 rpms. You likely won't see this on a quick dyno pull, but on a long 1/4 mile run the impact is big. Monitor what your car does if the EGT's get too high...

Data, data, data...

What is the egt temp when the computer will cut off Fuel, in my TDI I believe it was 1365 degrees and my tune would shut down fuel and then add again...

[xboxgod]

Originally Posted by DieselRacer

Meth for your car, YES, it helps a lot...

Is there a standard size nozzle for our cars? I got a meth kit from a member here (well parts of one) and I need to get a nozzle. My buddy has 3 different sizes and asked me what size. I have no clue.

[TDIwyse]

Originally Posted by DieselRacer

What is the egt temp when the computer will cut off Fuel, in my TDI I believe it was 1365 degrees and my tune would shut down fuel and then add again...

Was that pre or post turbo EGT's? I see it happening much lower than that on my car. But the EGT information is coming from the post turbo probes.

[Hoooper]

I launched around 2200-2400 rpm on stock runflats, did not hold the rpm there for long I just flashed it there after maybe the first yellow light. 1.9xx 60'.

[DieselRacer]

Originally Posted by TDIwyse

Was that pre or post turbo EGT's? I see it happening much lower than that on my car. But the EGT information is coming from the post turbo probes.

I believe it was pre turbo, I had a PC3 gauge and If I remember right on the TDI, it was a pre turbo sensor...Ill check, Im always interested in EGT temps...

[DieselRacer]

Originally Posted by TDIwyse

Was that pre or post turbo EGT's? I see it happening much lower than that on my car. But the EGT information is coming from the post turbo probes.

I believe it was pre turbo, I had a PC3 gauge and If I remember right on the TDI, it was a pre turbo sensor...Ill check, Im always interested in EGT temps...YES, IT WAS A PRE TURBO SENSOR...JUST CHECKED...

[Mark M]

In a recent autocross I toyed with a couple methods for launching. I got 13 runs that day on the course. On two runs I disabled traction control fully, M2, revved to 2k power braking. On both runs they were slower than my other runs. Sure it may look impressive with engine revs and wheel spin, but the lack of traction seems to kill the times.

My best lap times were traction control disabled, DS, then promptly ease into the throttle so as to minimize wheel spin until you have it floor and traction hooked up.

[Hoooper]

Originally Posted by Mark M

In a recent autocross I toyed with a couple methods for launching. I got 13 runs that day on the course. On two runs I disabled traction control fully, M2, revved to 2k power braking. On both runs they were slower than my other runs. Sure it may look impressive with engine revs and wheel spin, but the lack of traction seems to kill the times.

My best lap times were traction control disabled, DS, then promptly ease into the throttle so as to minimize wheel spin until you have it floor and traction hooked up.

If your autocross was like all the others I've seen, it was done in an empty parking lot and if you're lucky it had been swept clean. There's a wide canyon between that and a prepped dragstrip. Obviously if you're getting spin that's not the solution you're looking for. I guess the best launch technique is going to depend on your track and its going to take trial and error to feel it out. Personally I had no traction loss brake boosting to 2400 rpm and immediately going wide open, and there was more traction available that I didn't use in order to spare my tranny.

[Ryebread]

Originally Posted by DieselRacer

Mine takes off like a rocket, 2nd gear manual, I floor it and let it shift from there...

I do this as well.
I don't need to tell the D owners here.

but for you lurkers...

If is a guy in the next lane, who has a decent car with respectable or more power... and he was expecting to go WITH ME - or RUN ME. . . . they are usually embarrassed. Not saying my car is faster than everything that pulls up to me. But especially if the other car is a stick, sorry dude. the 335D launches like a boss. you just got embarrassed.

[DieselRacer]

Originally Posted by Ryebread

I do this as well.
I don't need to tell the D owners here.

but for you lurkers...

If is a guy in the next lane, who has a decent car with respectable or more power... and he was expecting to go WITH ME - or RUN ME. . . . they are usually embarrassed. Not saying my car is faster than everything that pulls up to me. But especially if the other car is a stick, sorry dude. the 335D launches like a boss. you just got embarrassed.

The mustang I raced you should have seen his face when he was trying to shift, and the 335i he was trying to hit buttons and flip switches and I was 4 cars ahead by then... I get yelled at a lot...