I have a mustang that runs 7.23 in the 1/8 mile and I want to slow it down to run a class that has a index of 7.75 I have a dedenbear stop and would like to know what I should set the 1st and 2nd settings at on the delay box for the stop for a start. Thanks

With a car that speed, your going need to go out .40 or .50 in order to have a decent reaction time. It should need to be 1.85 or so in the second timer if running about 4300 rpm while the stop is on.

Mark

Ditto; those numbers will get you very close.

Do I put .400 in the first timer

This message has been edited. Last edited by: p7050,

quote:

Originally posted by p7050:
Do I put .400 in the first timer

Yes .400 1st 1.850 second. If .400 lets you have decent reaction times, the the only # you change to adjust your et will be the second #..

Most "slow" cars have a VRT of about .27-.30 (time from transbrake release to front tires clearing the beams). This is the minimum amount of time you would want in the first timer. I went on the stop at .27 with my Nova, which ran 6.50s all out.

Human reaction time (top bulb on to button release) is typically .18-.24 depending on all those wonderful factors that trip us up - button, which finger, what time of day, sun/shade, etc. You add HRT and VRT and then put in enough delay to hit the tree. So a typical slow door car situation would be .20 HRT + .28 VRT + .02 delay = .500 which gives you a .000 reaction time on a .500 pro tree.

Of course, you have to figure in how "tight" you want to set up, which depends not only on the average but the variability of HRT and VRT, as well as your race strategy (how often you are willing to go red, and what you expect your "good hit" RT to be).

2bbl and short-shift.

Thanks

Not trying to high jack your post buddy, but there a lot of good help on this subject. My car runs 5.90 wide open 1/8 mile. How much 1st timer and 2nd timer would get me close to 7.oo H/R ?? Also how much reaction time delay due the average race run on a 500 pro tree ?? Thanks for the help

the hot rod car i drive runs 6.0s in my 1st timer i have 0.250 and my 2nd timer i think bout 1.65 and thats riding on the stop about 4100 rpms as far as ur r/t whatever u run in bracket racing jus take the first digit outta the box ex. for delay if u run 1080 take out the 1st number u wuld put 0080

Should I add the primary kit or just run with the secondary kit. Thanks

Probably going to need the primary kit to slow down as much as you want to.

My estimates were base on a 4 blade or linkage style stop.

What is the best way to set the stop up