spinning tires on launch. BAD?

[alex027]

The other day on my way home from work I stop at this stop sign with no one around and decide to practice my launch. I revved to about 5 grand and slipped the clutch nice. My tires spun for about 3 to 4 seconds then ripped off. It was an awesome launch. I know how to launch, and i did it right. Im just wondering if this is bad for the drivetrain. I told my friend about it and he said it was really bad for the car. ANy thoughts?

 

[leet]

Yes, AWD burnouts are a rather quick way to wear/break things.

 

[Defiant]

Launching is bad. The car will explain this to you in short order.

 

[alex027]

Im not trying to argue with anyone, and i believe you are right. My thoughts on it would be that if there is too much power on a launch wouldn't it be better for the extra power to get sent through tires spinning rather than getting choked up in the driveline somewhere? If you could a brief explanation would be good. Just so i understand. Thanks.

 

[Defiant]

_Something_ is going to break loose. Usually, it's the contact patch of the tire against the pavement. Next choice is the clutch disk. Those are the only two places it can slip. After that, things bend and break. Trouble with the tires is that they're still trying to grab, and when they finally do- such as, you've moved enough away from the grit and crap at the stop sign and have hit the first stretch of crossroad where the passing tires keep it nice and clean -it'll try again to break free. Sometimes it just breaks.

A gallon of gasoline has the energy to move a ton a hundred miles. An economy car will get a third that after friction, air resistance, engine cooling/inefficiency and other losses are done. A full-tilt DSM motor is putting out around 200 pound-feet of torque, and it's doing so after loading up the flywheel and other rotating parts with momentum. Bring that chain to a stop quickly enough, and you're going to be posting in the gearbox forum about rebuilding questions.

 

[Damn 2nd Gear]

defiant you never cease to amaze me. you are by far one of the smartest people ive ever heard. in bother knowledge and humor.

 

[Defiant]

Originally posted by Damn 2nd Gear
ive ever heard. in bother knowledge and humor.

Thank you. Some find me quite bothersome.

 

[layzie12g]

Hmm I just got my launch control set up and it spins like hell on the street. I cant even grab 2nd with out it bogging or with out me hitting the rev limiter in first sounding like a honda. Maybe i should stop.

 

[TunaTalon]

Thank you. Some find me quite bothersome.

When your tires are spinning they are operating on dynamic friction and, without down force, the maximum acceleration rate is 1G no matter how much power the engine is capable of. To accelerate faster the tires should be short of breaking loose. Until the tires break loose they are operating on static friction which is higher than dynamic friction. Friction - Wikipedia, the free encyclopedia

The difference between static friction and dynamic friction is why the top fuel dragster that smokes his tires loses.

Of course with a DSM something in the drive line will break anyway. Oh and it’s possible to be both knowledgeable and bothersome. At least that’s my theory, never having been told so myself.

 

[crimsondragon]

Talk about bringing back an almost 4 year old dead thread.

 

[TunaTalon]

Talk about bringing back an almost 4 year old dead thread.

Dang, you’re right. I didn’t even notice the date of the OP.
Four years and nothing has changed. Ok, now I’m bothered.

 

[crimsondragon]

Dang, you're right. I didn't even notice the date of the OP.
Four years and nothing has changed. Ok, now I'm bothered.

Not your fault. Layzie12g did it first

 

[Defiant]

Don't do this on the street. It's bad.