How long are you on the stop?

[Regan Wilson]

Originally Posted by sst7250

A 2.325 60'...Boy you must really kill it hard. I am typically at 1.8x and I leave on the stop at 3800.

I kill it hard but the 60 is usually 215 to 220 , I just had it chipped down real low on that pass trying to sort out the new combo . Its so heavy I have to have more track to get it rolling ....lol

[sst7250]

I found issues trying to be consistent at 2.00 or above. So we settled on 1.8x. I have been on the stop as long as 4.98 seconds. Would love to be able to drop that T Stop number and get back some MPH. I am usually 10+ MPH down from my all out numbers. Just cant seem to find a consistent way to do it.

Best of luck and thanks for the info, you must make some steam to get those numbers. Must be a LOT of motor in that hot rod truck of yours. Some day I will build a big motor. I feel so inadequate with only 500 cubes these days.

Here is one of my slips from Phoenix this past year, one of the times I actually got down the track. Think I managed to make a clean pass twice. Timer was at 4.79, a bit to long but you get the idea. 7250 of course

[RacingRicki]

Originally Posted by sst7250

I found issues trying to be consistent at 2.00 or above. So we settled on 1.8x. I have been on the stop as long as 4.98 seconds. Would love to be able to drop that T Stop number and get back some MPH. I am usually 10+ MPH down from my all out numbers. Just cant seem to find a consistent way to do it.

What rpm do you lay it down to on the stop? Do you shift while on the stop or after? Just trying to figure out how you needed to be on it for nearly 5 sec.

[sst7250]

Leave at 3800 and my first timer number is .000. I am at 4000 on the down power, does creep to 4150 or so and shift at .5. This engine is not really ever in its power band on the stop. It is not the typical Super Class motor.

My only reply as to why it is on the stop so long would be the car will run 8.0's wide open has been 8.02 at 168 and change best. I am using a Dedenbear big bore blade style stop on both primary and secodnary side. We have tried a few different things over the last couple of years and so far this set up seems to work best and keeps the car the most consistent. Any less RPM and the car is inconsistent. I am all ears if folks have suggestions on how I can spend less time on the stop. I have asked some of the fast guys in other classes but most run a different stop than I do, also seem to be "staged" set ups. As it is I think I could make a sandwich on the stop now. Either that or maybe I need to a radio so I have something to do while I wait

This is a "small" hp motor, not a ton of torque here. Big bore, small stroke deal. Used to be in the True 10.5" heads up car(replaced by Hemi 99). I used to have a 572" motor in the Cuda and went 150-1 on the stop for 3ish seconds. One day I guess I will build a big 600"+ motor but this one seems to be doing well. We are only crossing the stripe at 7200ish RPM stop racing which is well below the engines HP peak. Not the best set up for a S/ST car but hey it's what I had.

[RacingRicki]

We can take this to another thread if needed.

You should probably be using a multi-stage stop. It would allow you to not be on the first stage so long because the second stage would be engaged after the first stage shuts off.

Also, your rpm on the stop starts out at 3800 and creeps up to 4150. It is going to be tough to be predictable. I think you should lay it down to 3600 or more. If you have a recordable tach you should be able to see how steady it is. If its not steady at 3600 then some carburetor work is in order. It might be as simple as leaning out your intermediate air bleeds.

Another thing to think about is your torque converter. I have tried numerous different converters and have found that they can make a huge difference in how steady the rpm is on the stop.

#1 Stop makes a really good 2-staged stop.

[sst7250]

I just use the 3800 chip to leave(found this was bets place for RT consistency for me). Once I let go the car immediately goes to 4000. It will climb/creep to 4150 before it comes off. At least that is what the data recorder says. Car has been very predictable and repeatable this way. I agree a multi stage deal woudl be great, but I am a newbie at this and have no idea how to set one up really.

I have tried a few converters and the current one, once again has been the most consistent. Kills the car when we run it all out. I have a converter that is .15 better all out than this one which is WAY tight. But it is not happy on the stop at all. BTW I did just have another converter built for the car that we will get in it later this year to see what it does.

I dont have a lot of time on the stop with the car and this combination. Only a handful of S/ST races, by handful I mean 4, well 5 counting Phoenix last year.I was felling pretty good and thought we could do well til I had a cam fail(LSM lost it's heat treat) this past June that sidelined me. Just did not want to put the other motor in it as the info would be useless as it is an 800hp deal. A good bit less than my current set up. But once we settled on this tune I have been happy with the results. Made it to a Divisional final and Open final and an Open down to three cars. The .94 slip was my first pass on new tires with more rollout. Previous pass was an .899 at 155.03

Sorry dont mean to clog up this post. I have asked some of the faster guys about this stuff but most have been tight lipped really. I have learned a LOT from a couple of guys and appreciate thier help. But honestly neither had cars almost three seconds under the index either.

[Maverick]

I am sorry, but I was trying to use words that don,t sound right when used in a sentence. But you answered the question. A throttle stop is the bolt under the pedal. I just think the term throttle stop should be just that, the bolt under the pedal, and you should call the device that modulates the engine when you foot is against the bolt on the floor for what it really is. That way people will appreciate the type of racing so many do in the super classes, I try to call it for what it is. I have different names for this type of racing and none of them are boring. Just confused sometimes on how the car will run, or if it is actually having problems. I use the term CAT cars, don't take me wrong but it stands for computer assisted throttle. I look at the cars this way and it makes a lot more sense to me, and I appreciate them more for what people are trying to do with them. The more time you have to slow down the car at the very start of the race, the faster the MPH is at the end and you get there at the very last second to be a big surprise at the finish line. I hope to see a super gas car go 180 or 190 soon. I Think it wil be cool. I hope I get to race one. Oh, I just read yesterday that Jeggie is coming back to super gas with a new roadster, I thing he will be one of the faster cars, 175+.