Throttle stop help
 

First time stop user here. 3100lbs ,496bbc , 1.80 glide. Has electric Dedenbear under carb stop. Truck runs 6.15 with 1.37 60ft in the eighth have never even run it in the quarter yet. Was wondering about where to start and stop the stop and where to shift at and what RPM for a rough idea.

Re: Throttle stop help
 

Shift on time, not on RPM. Trust me, been there, done that, got the scars. Try something like 1.5 seconds out. You're looking for a time that makes the car run really stable on the stop -- the RPMs on the stop don't vary. Once you find a time that works, never touch it again. Makes for too many variables.

Lots of ideas on what the best "dead stall" (RPM when on the stop) is. I think you should pick a number that gets you to a time on the stop of between 1.5 and 2.5 seconds. If you're on it less than that, it'll be hard to find enough variability for all conditions. If you're on it longer than three seconds, you'll find it hard to be consistent. I think higher RPMs are better, but that's just a preference to not drop the engine way out of its power band. Here again, once you find a dead stall, stick with it. In fact, check it at the beginning of each weekend to be sure it's set the same.

As for what start/stop, there are a lot of opinions on this, but I'm a start at 0.00 guy. Then take a stab at an end time, work from there. First time, it's a total crap shoot (esp. with the dead stall discussion above). Once you have a run, swing the time wildly (like add/subtract a second) and run again. That'll give you a ratio, and you're good to go from there.

HTH,
Chris

Re: Throttle stop help
 

Yeah I ordered a Pro Cube with the three timers so i could shift on time. Thanks for the advice.

Re: Throttle stop help
 

What class are you going to try and run? S/G or S/ST?

Re: Throttle stop help
 

S/ST guess i kinda shoulda added that . lol

Re: Throttle stop help
 

For RPM on the stop the consensus from most are approx. 4100rpm...seems to be where most of us are. I would go on the stop somewhere around .1 to .3 seconds....with slower cars .2 to .3 works great. Dragsters/roadsters like .1 From there like Chris said you need to make a full run to see what your car actually does to know how much to slow it down. My guess is that you are going to run about 9.75 so you need to kill about 1.15 seconds. You'll just have to throw some time at it and see how it responds....you will probably be around 2 to 1 on ratio. So I'm guessing that you will put about 2 seconds in the stop.

While it is trial and error, it usually comes around pretty quickly...you will get a ratio within a few runs.

Welcome to the Super Classes!!

Ron & Meridee
33 S/C

Re: Throttle stop help
 

Aren't you guys going to discuss the Weather Station he needs. I made that mistake when I first started running on the TS 2 years ago. I had the TS but didn't know to buy a Weather Station. Man, what a learning curve that was...:( Of course once I got the weather station I had to get a generator etc. I'm finally set up and things are becoming clearer now. Last weekend I finally got around to using my beeper.

Re: Throttle stop help
 

Although I have a full setup from Family Software and highly recommend it, I know lots of folks who win with just a portable unit like the Performaire or even the Krestrel.

Re: Throttle stop help
 

Chris, I've got the Alta Lab II unit. The unit is much smarter than I am:(( But I'm beginning to understand more each time out.
Bill

Re: Throttle stop help
 

Good Advice you need the weather....but not totally convinced you can't do it with a hand held. Maybe 'cause that's what I use (cheap). But then again, I am the only guy in Super Comp that still shifts his car by hand (stubborn). Definitely doesn't hurt to get the best data you can... If bucks aren't an issue go with the good stuff suggested, 'cause even the handhelds have a learning curve.

Ron & Meridee

33 S/C
'09 Jeg's Allstar