t stop thoughts/debate

[Barney B]

Originally Posted by sc7667

When starting out I was told and tried to set up the stop RPM so that you have a 2 to 2.5:1 ratio. even the stop manufacturers recommend this. I have had cars that it is 4000rpm and cars that that is closer to 5,000. I was told by Sherman Adcock once that you never want to go below 4000. I think it is because the convertor makes the car inconsistant.

Roy

Told by who?

[sc7667]

Originally Posted by Barney B

Told by who?

This was suggested to me by Sherman Adcock about 10 years ago. I trusted what he said as he had won a supergas championship. One of my cars is a 160mph car but the other I drove for a few years is a 175mph car and it is set at 4000rpm and I only have 2-2.5 in the timer. I do know a couple of high mph cars that set their stops at 4000 and have about 3 seconds, these are 180+ mph cars that have tried lower without success. There are always acceptions to the rule. There are also other factors in your setup that can effect this working or not like shift time, tire and gears.

[sst7250]

You can count me in the 5 seconds of stop time group too

[EricArrow]

I was at 4500 with the small motor....on for anywhere from .75- 1.75 depending on the weather......It would .90 pretty consistantly....So far with the bigger motor going down to 3800 with roughly the same..maybe a little more in the timer it seems to have worked decent....I'm still getting use to it ..and I'm sure I'll figure it out but I would have say at this point the higher rpm worked a tad better.

[sst7250]

FWIW I am at 4000 downpower. I cannot go any lower and maintain consistency with my set up. Timer one is set at .000, I shift at .5-.75 depending on the track and timer two is typically 4.85-5.00 depending on weather etc. With this set up I typically go 10.90 at 157 or so.

[CBS jr]

Originally Posted by sst7250

FWIW I am at 4000 downpower. I cannot go any lower and maintain consistency with my set up. Timer one is set at .000, I shift at .5-.75 depending on the track and timer two is typically 4.85-5.00 depending on weather etc. With this set up I typically go 10.90 at 157 or so.

Shyt you can't keep the car running that long. 157 maybe... with tailwind at infineon....LOL

[JJ3159]

157 at 10.90 got to be pretty serious motor ,i'll run 4 seconds and go 10.90 at 150 151,same rpm set up its 9.90 156 with 2.4 timer shifting on time 1 second in for both set ups
,

[Barney B]

Originally Posted by sc7667

This was suggested to me by Sherman Adcock about 10 years ago. I trusted what he said as he had won a supergas championship. One of my cars is a 160mph car but the other I drove for a few years is a 175mph car and it is set at 4000rpm and I only have 2-2.5 in the timer. I do know a couple of high mph cars that set their stops at 4000 and have about 3 seconds, these are 180+ mph cars that have tried lower without success. There are always acceptions to the rule. There are also other factors in your setup that can effect this working or not like shift time, tire and gears.

I was joking he is a friend and team mate. My combo is; .10 first timer and anywhere from 1.6 to 1.9 on the second timer, shift at .70 out. I play back ever run and my dead stall is 4100 rpm give or take 50 rpm's.
I go anywhere between 168 to 171 @ 8.90 on the stop.
BB

[sc7667]

Originally Posted by Barney B

I was joking he is a friend and team mate. My combo is; .10 first timer and anywhere from 1.6 to 1.9 on the second timer, shift at .70 out. I play back ever run and my dead stall is 4100 rpm give or take 50 rpm's.
I go anywhere between 168 to 171 @ 8.90 on the stop.
BB

Cool, he really set me on the right path. I was young, dumb and struggling to get my car to work on a t-stop. He was at a George Howard big money race in Tucson as a guest speaker and came to my pit and talked to me for a good half hour about throttle stop theory.

My uncle's car, that I drove for a couple of years, is very similar to that setup. Same RPM similar shift and on tmer for 2.25 to 2.5 depending on track elevation 171-175mph. One of the most cosntent cars i have seen, but liked to throw out a 4 hundredths slow run once a weekend, usually in eliminations.

[Ed Swearingen]

Y'all know my thoughts on the subject! Get rid of all those big motors and get "Adjustaflows". It's been working for me since '84.