Transbrake launch rpm? - Page 2

L79racer · 05-06-2010, 04:45 PM

Quote:

Originally Posted by Bob Verwold

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

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

Mike Pearson · 05-07-2010, 06:35 AM

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

Darrin Christen · 05-07-2010, 08:43 AM

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.

L79racer · 05-08-2010, 08:21 AM

Quote:

Originally Posted by Darrin Christen

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.

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.

Darrin Christen · 05-08-2010, 08:49 AM

Quote:

Originally Posted by L79racer

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.

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

L79racer · 05-08-2010, 09:32 AM

Quote:

Originally Posted by Darrin Christen

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

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

Darrin Christen · 05-08-2010, 09:51 AM

Quote:

Originally Posted by L79racer

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

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

L79racer · 05-08-2010, 12:43 PM

Quote:

Originally Posted by Darrin Christen

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

Yup, 7200-7400

05-07-2010, 06:35 AM	#12
Mike Pearson VIP Member Join Date: Mar 2007 Posts: 2,321 Likes: 546 Liked 1,629 Times in 502 Posts	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 __________________ Mike Pearson 2485 SS

05-07-2010, 08:43 AM	#13
Darrin Christen Member Join Date: Mar 2007 Location: Des Allemands, LA Posts: 365 Likes: 8 Liked 1 Time in 1 Post	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. __________________ 4878 SS/GA 66CHEVY II