Throttle Stopping

cdh124 · 10-11-2011, 10:43 AM

Quote:

Originally Posted by CUBEMAN

This will be my first venture into S/R racing and was kinda looking for pointers on the T/Stop settings. My car will be approx 1.75 sec under the index. I am looking at going on the stop at .2 or .3 and shifting at .6 and then being on the stop for 1.75 or the approx differance in et on a wide open run to a T/Stop run. Think I may be close or way off ?

My car will run 8.50 flat out and I am on the stop at .3, shift at .5 and am on the stop about 2.20 with air about 2500-3000ft and 4200 rpm while on the stop. Last year at Virginia in October I was on the stop about 2.5 seconds, hopes this helps.

Duane Dagostino · 10-11-2011, 10:47 AM

cdh124 is close if your "cruise " rpm's are about 4200. you'll be at 2.50 or so...good luck.

CUBEMAN · 10-11-2011, 12:09 PM

I will go to idle at .2 or .3 and shift @ .6 and thought that with a car that can run at least 1.75 under index that I would start by taking that amount (1.75) and stay on the stop that amount of time for starters. By running a Terminator I will go to idle quickly. I could be all wet here

jmcarter · 10-11-2011, 12:19 PM

Quote:

Originally Posted by CUBEMAN

I will go to idle at .2 or .3 and shift @ .6 and thought that with a car that can run at least 1.75 under index that I would start by taking that amount (1.75) and stay on the stop that amount of time for starters. By running a Terminator I will go to idle quickly. I could be all wet here

You're assuming a 1 to 1 ratio and that's incorrect...remember you're still covering ground while on the stop. And your RPM on the stop needs to be up in the ~4200 range. Think the others are right with 2.50 being close. Danny and his son can get you close too...better do the test and tune, you'll need 2-3 laps to even get close to your ratio.

CUBEMAN · 10-11-2011, 12:29 PM

Thanks for helping.

jmcarter · 10-11-2011, 01:19 PM

One of Biondo's excellent primers on stops, more on their site. They are great to deal with and one of ClassRacer's sponsors BTW.

http://www.biondoracing.com/manuals/...20Stops/TS.pdf

Duane Dagostino · 10-11-2011, 03:15 PM

Going to idle w/fi changes a lot from carbs...try to find a racer with the same set-up,you could wind up 1-1 or close

10-11-2011, 10:47 AM	#2
Duane Dagostino Junior Member Join Date: Aug 2005 Location: Fl. Posts: 74 Likes: 0 Liked 0 Times in 0 Posts	Re: Throttle Stopping cdh124 is close if your "cruise " rpm's are about 4200. you'll be at 2.50 or so...good luck. __________________ Duane Dagostino 1821 S/C, S/G

10-11-2011, 12:09 PM	#3
CUBEMAN Junior Member Join Date: Jul 2011 Posts: 7 Likes: 0 Liked 0 Times in 0 Posts	Re: Throttle Stopping I will go to idle at .2 or .3 and shift @ .6 and thought that with a car that can run at least 1.75 under index that I would start by taking that amount (1.75) and stay on the stop that amount of time for starters. By running a Terminator I will go to idle quickly. I could be all wet here

10-11-2011, 12:29 PM	#5
CUBEMAN Junior Member Join Date: Jul 2011 Posts: 7 Likes: 0 Liked 0 Times in 0 Posts	Re: Throttle Stopping Thanks for helping.

10-11-2011, 01:19 PM	#6
jmcarter VIP Member Join Date: Dec 2008 Location: Richmond Hill GA (and Port Ludlow WA) Posts: 4,310 Likes: 2,432 Liked 3,232 Times in 983 Posts	Re: Throttle Stopping One of Biondo's excellent primers on stops, more on their site. They are great to deal with and one of ClassRacer's sponsors BTW. http://www.biondoracing.com/manuals/...20Stops/TS.pdf __________________ Jim Carter 2340 Super Stock 2340 SST/2340 Stock Set another place at the table

10-11-2011, 03:15 PM	#7
Duane Dagostino Junior Member Join Date: Aug 2005 Location: Fl. Posts: 74 Likes: 0 Liked 0 Times in 0 Posts	Re: Throttle Stopping Going to idle w/fi changes a lot from carbs...try to find a racer with the same set-up,you could wind up 1-1 or close __________________ Duane Dagostino 1821 S/C, S/G