kimeran

It is true.

I don't know the physics behind it, but it has happened to me on several occasions.
Not so much on the C63 for some reason. Whether I spun or not, my trap speeds would be the same.

On a bunch of other cars, excessive spinning off the line resulted in higher traps and lower ETs.

13pp63

Traction off brake gas launch is what worked best for me and drag radial of course 11.80 is my best with a custom tune at 118 1.8 60 foot

Jasonoff

LOL did you read any of that? It's ratio of ET vs trap not overall trap.

If you have a 1000hp car up against a 200hp car and they both get the same ET. It's because the 1000hp car couldn't hook up right away but once it did, it made up for in speed.

If you spin your tires off the line you're not going to get a better Trap than if you didn't which is what Shmenge said a few posts back...

EDIT: forgot to quote 6ml

6ml500

My guess is that traction control was robbing power for the first couple of gears and reduced my trap speed a bit. I'm also thinking my car could be underpowered.

Maybe the traction control was interfering with my 1-2, 2-3 shift points as well. I will try traction control off next time around and see how the timeslips read.

I was in S+ for all 4 runs. Didn't try S or M.

Jasonoff

And why was your traction control stepping in?

Celicasaur

Yes and can somebody pleaseee explain why the hell the car does this? It's so ****ing annoying when you want to race someone and it short shifts at the end of 2nd and leaves you at like 4800rpm (on the tacho, which is probably around 4300-4500rpm at the crack) and then you're right out of the powerband in that long 3rd gear, fruitlessly staring at the speedo as it slowly climbs 60-80mph and then gets into the powerband. Is this because traction is on? Will sport mode make it shift at fuel cut? I've been too scared to try that on the street.

I have a feeling that this might just be the 'issue'. Similarly to my rant above, by having a 'shorter' suite of gears and being out of the powerband for more of the track than it should have been, that could well explain the low trap speed.

6ml500

I had Michelin PSS on my last car. There isn't a world of difference between the two in straight line racing. Please look at reviews for the Michelin AS3+ before bashing all seasons. It was my technique. I know this. I blame the tires maybe 5-10%.

Jasonoff

Can you point out where I bashed all seasons? No? It's because I didn't...

They're just not designed for what you're doing. Doesn't matter how good your technique is. You can't hammer in nails with a shoe very well can you?

PSS still isn't a tire for the job either. Just sayin'

6ml500

Fair enough. I may have taken that out of context. At the end of the day I was really more concerned with my lower trap speed than I expected. I've read posts with sub 2.0 60 foot times on worn out all seasons. I know the trap speed is largely unaffected by this until you throw in other issues from the traction control kicking in and short shifting.

I have recently tried my launch on the street and cannot seem to get off that quickly. Traction off - I'm launching way too soft, or it spins the tires, or shifts early. I tried brake torquing, but the car won't allow it. It just won't get the revs up and it feels like I'm going to brake something. I tried race mode launch and it felt quick with little drama, but I know it's different at the track. Btw I have the lsd and MCT transmission Not sure if that impacts brake torquing.

AMGonFire

drag radials will compleatly change how your car launches trust me. Zero wheel spin and you can brake torque as hard as you want.