throttl stop ratio?

[powerstrokeace]

Guy's kind o new to the stuff and have 2 dragsters for the kids. I'm having a hard time figuring out the throttl stop ratio's.
here's an example
Run number one have 2.00 in the timer and car runs a 9.321
Run number two we have 3.00 in the timer and the car runs a 9.488
we are on a 9.50 index. So I under stand that you divide the timer change by the et change and looks like this
1.0 Divided by .167 = 5.988 so would that be a 6 to one ratio?

Ace

[billy leber]

Yup. Im assuming your cruise rpm is fairly hi ?

[powerstrokeace]

I've only ran the car once and I think its some where between 4200-4600 rpm's

Ace

[Charlie Yannetti]

I think Billy hit on your possible problem.. try setting it at 4000.. and maybe have the first timer come on at .100 into the run.. then try your 2.00 and 3.00 runs..

Don't know where you have your first timer coming on, but that also makes a diffence..

[powerstrokeace]

first timer comes on .030 in the run and the shift timer shifts 1.50 in the run. I also have a #1 stop thats air and has both primary and secondary plates. I'm a little comfused as how to read the number of turns on this. I think the less turns out will drop the rpms

Ace

[billy leber]

I like to bring the stop on at .100 like Charlie said , I tried to bring it on at .030 , granted I only tried it for one run but im pretty sure the car didnt get out of the beams before the stop came on. I recall feeling like I hit it good and looked up to see an .040 light so I put it back to .100 and was .003 red next hit. If you are running a dominator carb with an under carb stop I wouldnt drop rpm below 4200 ,IMHO. The farther you screw the knob out the lower the rpm will drop, its easy to set by taking the air out of the stop cylinder and put a spring to hold stop blades shut, then put it against the trans brake. Your rpm will be 150-200 rpm higher when your rolling down the track than when on the break, so if you want 4200 set it at 4000 on the brake