[75TA]

I am new to drag racing and am going to take my car to the track for a test and tune soon and want to know how you launch the car with a Trans-brake? Do you set the Trans-brake with the car in 1st and floor the gas peddle and let the rpm go to where the torque converter allows or do you bring the rpm up to the stall speed of the torque converter and when you release the Trans-brake floor the gas peddle?

[fasteddy]

Normal procedure without a delay box is to have a 2 step rev limiter. When you activate the tranny brake, the low step RPM limiter is also activated. This allows you to floor the gas pedal on the top amber bulb and release the brake on the bottom amber bulb. When you release the brake, the engine is again on max rev limiter and off you go. This provides consistency in launch RPM and therefore ETs.

[johnta1]

Most brakes will have to be in 1st to work.

If you don't have a 2-step type set-up, I would probably go with the part throttle RPM launch.
You would have to still remember to nail it when appropriate.
That's one reason the 2-step is used with a brake. You floor it and let go of the button when appropriate.

[79TA455STROKED]

You can also just wait a little longer to floor it(secong light),then just let go of the button when it time since you dont have a 2 step.I used to do it.
The motor will go rite to the stall speed of your converter.

[Rob B]

Originally Posted by 79TA455STROKED

You can also just wait a little longer to floor it(secong light),then just let go of the button when it time since you dont have a 2 step.I used to do it.
The motor will go rite to the stall speed of your converter.

That's the safer idea if you don't have a 2 step but I would invest in the complete ignition package including the 2 step before actively racing with the brake. why put undo strain on the converter, motor, and trans.

[02Hawk]

I don't use a two step. I bump in and then take her up to 4K and then let go of the button. Not consistent yet but closing the gap

[Probird]

Like was said about the 2 step. It has an rpm chip that can be changed to leave at what ever rpm you want, it's activated with the transbrake button. You can also just set the transbrake with the car in first gear and floor it when the top bulb comes on. It will only go to the max stall of the convertor. Just wait to floor it until you see the top bulb. It will work fine that way.

[BVR421]

New to racing? new car? test and tune?
It sounds like maybe the first time for both car and driver?
Usually a few issues for both the first few times. I dont know maybe you've already been out a few times and have all your ducks in a row?
Regardless I suggest forget the transbrake and leave off idle for the first dozen or so runs until comfortable with the car.
With a 505 you are likely to have traction issues especially on a T&T prepped track. Just keeping the car straight might be a full time job
A brake and a delay box is great for consistant killer reaction times but the car wont be faster at all. I agree leaving on the transbrake is a lot of fun but so is footbraking.
My opinion is to learn to footbrake it first then go to the other deal when you get to seriously bracket racing.

[75TA]

Thanks for all the input. I do plan to start slow and get the hang of the car. I do have a two stage rev limiter (digital 6), but I do not have the second stage hooked up yet - should be easy enough. If I do set-up the second stage (or first which ever), what rpm would be the ideal setting - torque converter is a 4000 stall. My plan was to footbrake at first and if comfortable go to the trans-brake.

[johnta1]

I'd go with 3800/4000 RPM

[Probird]

I agree with John. I've found that 3800 works very well.

[70 lucerne lemans]

Originally Posted by 75TA

Thanks for all the input. I do plan to start slow and get the hang of the car. I do have a two stage rev limiter (digital 6), but I do not have the second stage hooked up yet - should be easy enough. If I do set-up the second stage (or first which ever), what rpm would be the ideal setting - torque converter is a 4000 stall. My plan was to footbrake at first and if comfortable go to the trans-brake.

Alot has to do with track prep and tire size.If it's a big tire back half car I agree with 3800,if its a stock type suspension with 28/10.5 tires,I'd start around 3200-3400 and go from there.No way will my car hook leaving at 3800 on a TNT prepped track.

[goatasaurus rex]

what i like to do even though i use a two step box and brake, is to roll into the throttle when the 1st yellow comes on having it on the floor by the time the 3rd yellow comes on. seems to reduce beat down on parts.fwiw

rex

[Thomasmoto]

Originally Posted by BVR421

New to racing? new car? test and tune?
It sounds like maybe the first time for both car and driver?
Usually a few issues for both the first few times. I dont know maybe you've already been out a few times and have all your ducks in a row?
Regardless I suggest forget the transbrake and leave off idle for the first dozen or so runs until comfortable with the car.
With a 505 you are likely to have traction issues especially on a T&T prepped track. Just keeping the car straight might be a full time job
A brake and a delay box is great for consistant killer reaction times but the car wont be faster at all. I agree leaving on the transbrake is a lot of fun but so is footbraking.
My opinion is to learn to footbrake it first then go to the other deal when you get to seriously bracket racing.

I TOTALLY AGREE!!
Get used to the set-up first.