Transbrake launch rpm?
 

I was wondering what rpm's to launch off a transbrake. High or low? ATI states to go as low as possible without the car hesitating and that will produce the best times. Just curious to know what you guys have found. Maybe post some stall speeds and launch rpms.

Re: Transbrake launch rpm?
 

5200 converter leaving at 4700. Max tq at 5900. Works on my 3020lb pig.

Re: Transbrake launch rpm?
 

Have you ever tried a 2500 or so launch?

Re: Transbrake launch rpm?
 

Hell, mine idles at 1600RPM. No never tried that.........Also I'm leaving off a .500 pro tree.

Re: Transbrake launch rpm?
 

Anywhere between 3500 and 4500 with a converter that would "flash" to between 6700-7000 depending on air.

Car would always 60' about the same whether it was 3500 or 4500. Just a lot more violent the higher you leave on the chip.

Re: Transbrake launch rpm?
 

Wow thats a lot of stall. How high are you shifting that thing?

Re: Transbrake launch rpm?
 

The reason I'm asking is because I've been foot braking it at 2500 and it has run a best of 10.05@134 with a ****ty 1.44 60'. Wondering what to expect or work to get once I start leaving off the trans brake at around 4000. I have a 5500 stall converter. I think it should be going a 1.38 60'. It two weeks I have a track rental and I'll be able to try different launch rpms and shock settings. Should a 1.38 be hard to get?

http://i43.tinypic.com/24onf9j.jpg

Re: Transbrake launch rpm?
 

Oh hell! short story.....a buddy had a Pinto "bracket" car...would footbrake run 7.70's 1/8 mile....the brake for bracket 1 was 7.50 & he wanted to run bracket 1. Sooo he was having a new engine built (he wanted to run 7.30's ) he got his new trans with a brake so put it in with the "old" engine....car went 7.48 first pass! He said "hell all I needed was the trans!" with the "new engine" the car ran 6.80's!!!

Re: Transbrake launch rpm?
 

If I pick up 2 tenths on the brake, I'll have one big smile. Anything into the 9's and I'm happy.

Re: Transbrake launch rpm?
 

L79 ,you know when ya get into the 9.s the rules change!!!

Re: Transbrake launch rpm?
 

Yea I know, I dont have a license yet and car isnt certified but, I still want the slip baby!! LOL!!

Re: Transbrake launch rpm?
 

On my car the leave RPM more affects the reaction time than the ET. I would start out about 3800. Then bump up or down to find a comfortable spot on the tree

Re: Transbrake launch rpm?
 

2850# car with 355" sbc, glide with 1.76 low gear, 5,800 stahl, 33" tall tire, 5.43 rear gear, leaving with trans brake at 4,000-4,600 it will 60' in the low 1.30's and run 9.80's-9.90's at 132-134mph crossing at 8,000rpm. I have only foot braked the car once in the last couple of years and it ran 10.20 leaving at about 1,800 rpm in the middle of the summer. On my car I think the brake is worth about a .10-.15. Hope this helps.

Re: Transbrake launch rpm?
 

Yes this is exactly what I was looking for. Now if you can go a low 1.30
should I be able to do the same because my mph matches yours? I have 4.56 gears with a 29" slick with a 1.80 first gear and 5500 stall.

Re: Transbrake launch rpm?
 

I would think so. How much does your car weigh and what size is your engine?

Re: Transbrake launch rpm?
 

Its a pump gas 383 weighing in at 2870 with me in it.

Re: Transbrake launch rpm?
 

I'm guessing it crosses at about 7,000 rpm?

Re: Transbrake launch rpm?
 

Yup, 7200-7400