WTF why are these launches so different?

[ItsHectic]

Great launch:

Typical DCT launch:

Stock car beats the tuned car!!

That guy even manages a good LC launch without spinning up all of 1st.

[edisapimp]

Is this your car? What is the tune? What type of tires are both cars on? What track is the top car on and what track is the bottom car on? How was the lane prepped? What was the temperature of the surface? What was the temperature of the tires? What is the elevation?

EDIT: BMW PPK is not really a huge "tune."

The first video is really *not* a great launch, definitely much more than a 2 second 60'. And RS3 are not Drag radials.

[ItsHectic]

Not my car but my car and every other one in youtube spins up ALL of 1st no matter the launch.
The numbers are on the youtube page of the magic guy, and in the video of the normal guy. its ridiculous, the guy with the claimed "bone stock" 135i has some sort of magical DCT gearbox, the LC revs even sound to be at the same RPM. But his car drops the clutch differently it seems. And when he steps on it, it doesnt hesistate, he even manages a little burnout before lining up.

[edisapimp]

Tires. You can't seriously drag race on street tires.

[ItsHectic]

Originally Posted by edisapimp

Tires. You can't seriously drag race on street tires.

"Bone stock"

And how did he manage the rolling burnout???

Im being serious BTW I havent been to a strip.

[ItsHectic]

Okay well thanks I guess this explains a lot, the DCT is tuned for the strip not the road.

I saw a manual 135i on drag tyres manage 1.9 20' and someone here with a stock 1M managing 2.4 so didnt expect his 2.2 to not be on street tyres.

[edisapimp]

When you say 1.9 20' do you mean 60'?

20 feet in 1.9 seconds is... well, it's golf cart slow.

And I don't understand what you mean by "And how did he manage a rolling burnout?"

There is a waterbox at the drag strip, you drive through it, or more regularly you back up into it, and do your burnout in the water to get the tires to temperature, then you roll out of the box and dry. At least that's how it should work.. Honda owners rarely understand this (FWD means they have to drive through the water box, then get the line wet for the RWD cars - annoying.)

[barnsdale]

And this is why you don't buy DCT lol....just watching the video seemed so boring using the shifter paddles and no manual clutch.

Tires will make a huge difference though for sure.

[AYEDEE]

Steptronic ftw!

[killerhurtalot]

Originally Posted by AYEDEE

Steptronic ftw!

The DCT was better than the old 6 speed steptronic... but the new 8 speed steptronic is better than the DCT.

[Kdiddy007]

Originally Posted by killerhurtalot

The DCT was better than the old 6 speed steptronic... but the new 8 speed steptronic is better than the DCT.

You tripping holmes... DCT= faster shifts over any auto box although the 8 speed is fantastic still not on par with DCT

[MuNkY6913]

Supposedly were going to the strip on Saturday. If the weather works. I'll try to get a video of my launch. Finally going to get a chance to do it with the 2 step rev limiter. Using 255/35/18 federal high performance tires. Don't know if I'll be able to force myself to use the no lift shift. We'll see.

[edisapimp]

Originally Posted by MuNkY6913

Using 255/35/18 federal high performance tires.

You'll experience wheelspin.

[MuNkY6913]

Originally Posted by edisapimp

You'll experience wheelspin.

Falkens I had last year stuck pretty good. Those were 245's. As long as I did a little burn out in the box to get all the rocks and crap off them they seemed to work ok. Little to no wheel spin with those. We'll see how these go.

[brusk]

DCT can't match the 6sp Step at the strip due to the 2nd gear launches that the steps can get. I don't think a DCT has even seen low 11's yet where there have been several steps get under 11.5.

[MuNkY6913]

I don't like the idea of a second gear launch. I guess we'll see how first gear handles the 2-step and go from there.

[MuNkY6913]

Originally Posted by brusk

DCT can't match the 6sp Step at the strip due to the 2nd gear launches that the steps can get. I don't think a DCT has even seen low 11's yet where there have been several steps get under 11.5.

This isn't the first time someone has said about second gear launch. I guess I'd have to see someone else do it before I did.

[ItsHectic]

Originally Posted by MuNkY6913

I don't like the idea of a second gear launch. I guess we'll see how first gear handles the 2-step and go from there.

I honestly think the way to maximize DCT is to detune 1st gear and shift early in to 2nd.

But launching in 1st looks pretty good from the 1st video, seems launch control is tuned for drag radials, I cant see why you would need to take off in 2nd.

And besides 1st gear is just to take off isnt it, I thought all drag racers shift early in to 2nd, or atleast if wheel spin is a problem.

[brusk]

2nd gear launches is only for the 6AT Step trans. It limits the power just enough on take off and maximizes the enormous amounts of low end torque these little turbo's put out. So it ends up being similar to limiting 1st gear's power and no time delay or timing issues between shifts. 6MT guys recommend just launching and immediately shifting to 2nd. I need to start going to the track to try both. Same might work for DCT's. As for 60' times 6AT Steps can get it down to 1.9 pretty easily and consistently. I've only seen a few 6MT's under 1.9 and they are pretty inconsistent.

[ItsHectic]

I tried immediately shifting to 2nd I think and it was a much slower 0-100 time, I think it went from 5seconds to 6 seconds, I got my best time shifting at around 4k RPM.

[ItsHectic]

The guy from youtube got back to me, he is using Hankook Ventus V12 tyres, dont know how they compare to the PSS everyone uses?

Is the asphalt at the strip that much more sticky than on the street?

[MuNkY6913]

Originally Posted by ItsHectic

The guy from youtube got back to me, he is using Hankook Ventus V12 tyres, dont know how they compare to the PSS everyone uses?

Is the asphalt at the strip that much more sticky than on the street?

Hell yes it is. The track we go to is super sticky. They have Nhra dragsters there and a lot of the guys running in the street races use slicks too. They have all sorts of racing events and those big drag slicks those guys run put down some rubber. They do a really good job keeping the track up too.