potential hazards by holding brake while gassing?, talking about an automatic Options

[daazndood]

hey guys. i was wondering if it would be bad for a car if i were to hold down the brake and gas at the same time , sorta like to launch the car by releasing the brake.

i noticed that i can go 0-60 in 10.2 seconds if i just step on the gas alone, but if i hold down the brake and rev the engine to about 2k(thats highest i can keep it before it starts moving) and release the brake i can hit 60 in 9.4. i was just wondering if i am hurting my car. i really dont do this that much and i dont try to race or speed anyways. thanks guys

[neKronos]

I believe this is referred to as break torquing?

"In general, automatic transmissions are known as being more useful for lazy commuters than for hardcore racers. But it may be surprising for some to know that many pro drag-racing cars have heavy-duty auto gearboxes. That's because the brake-torque launch is an automatic specialty. This launch involves keeping the car stationary by flooring the brakes with the left foot, while using the right foot to rev up the engine against the torque converter. In technical terms, this preloads the entire drivetrain with the stress of a launch, allowing the engine to rev closer to its power and torque peaks at the starting line. Brake-torquing is also beneficial for turbocharged engines as it allows boost to build up before the launch, reducing turbo lag. The only problem is that there is a lot of stress on the transmission, and the consequent heat build-up can destroy your automatic gearbox. Unless your car has too much power for the tires to handle, a brake-torque launch usually will not spin the wheels. This is because the automatic transmission absorbs the shock by design, and brake-torquing actually reduces stress on the rest of the drivetrain. Instead of a sudden massive load, the drivetrain has the torque applied slower instead of one huge jolt.

If your car has power brakes, you could apply the brake-torquing technique even better. At the starting line, shift your auto gearbox into neutral and floor the brake pedal with your left foot. Rev the engine once and quickly get off the throttle. You will feel the brake pedal sink further to the floor. This greatly increases the braking force. Now shift back into gear. You will now be able to rev up the engine even higher against the torque converter."
- http://www.modernracer.com/tips/dragracing...techniques.html