Throttle Stop Help!!!

Floyd Gomez · 05-08-2009, 08:20 PM

Hey guys,
I have always raced bracket or stock/super stock and am now moving into super gas. I have never run a stop and am more confused than a fat man at a vegetarian resturant. So many choices and types. And then there is the shifting questions, stop on or off. Somebody help. PLEASE

S/G 386N · 05-08-2009, 09:48 PM

This should help you get started.

http://www.biondoracing.com/tips.shtml#throttle

It takes time though. Going to need quite a few runs to figure out your ratio. Then you have to figure out your ratio in relation to the weather as well. Everybody has their own opinion on how to tune the car to the throttle stop. I don't think there is a definate answer to how you should do it. I've always heard that you want to go on the throttle stop as early as possible, as this will bring your MPH up. I go on it at .1, but I know some that go on it as early as a few thousands. Shermon Adcock Jr. waits for closer to a second before going on, at least that's what I've heard. I ran against him in a time trial in Gainesville, and he was quite a ways ahead of me after launch, so I think it might be true. Either that, or he runs a much higher throttle stop RPM than I do. All you can do is make runs, and figure out what you are comfortable with.

Lou SG2340 · 05-09-2009, 05:14 AM

I have found 1Stop to be the best throttle stop. It is an under the carb stop that takes away the
linkage problems. Gary at 1Stop (319-277-5290) will spend as much time with you as necessary to help you with his stop.

I turn my stop on at .02 & shift at .40. I set the rpm at 4100. Every car is different. You have to test & see what works for you.

Floyd Gomez · 05-09-2009, 12:27 PM

Lou, Does the under carb stop cause a big load in fuel?

Lou SG2340 · 05-10-2009, 05:29 AM

No. I suggest you keep your stop speed over 4000 rpm. One of the hardest part of stop racing is to get a carb that does what you want it to while on the stop.
If shifting by time, which is the best way, you want to hold a constant rpm.

PM me your phone # if you want. I am leaving for Bristol Wed then going to Maple Grove. Lou

don R · 05-10-2009, 11:09 AM

We just went from a linkage type to an under carb type. I was having a problem keeping the stop RPM consistent. #1 got us one quick and we stayed close to our original set-up. The first pass was close and the second was 8.904 which got us the first round bye. We made it to the third round Saturday and Sunday. Not yet perfect but better than last season and early this year.

Chris Williams · 05-12-2009, 11:04 PM

We run a Dedenbear TS6 which is an under carb disc type. We love it. It has both on and off CO2 lines, meaning you can control both on and off speed precisely. It's also amazingly consistent.

We go on the stop immediately (0.00), run at 4000 on the stop, and shift on time (at 1 sec). Of course your mileage may vary. We run a dominator on a 565 BB. We go on the stop ASAP so that we can be the chaser, not the chasee, and run the max MPH.

We tried shifting on RPM and found it just couldn't stay at a consistent RPM on the stop. It would just climb. And that made it impossible to predict. We shifted back to shifting on time, and it's laser straight (on the graph data) at 4000 throughout the entire time on the stop.

Hope this helps,
Chris

S/G 386N · 05-13-2009, 10:33 AM

Quote:

Originally Posted by Chris Williams

We run a Dedenbear TS6 which is an under carb disc type. We love it. It has both on and off CO2 lines, meaning you can control both on and off speed precisely. It's also amazingly consistent.

We had one of those disc style throttle stops on my dragster. It might be consistant, but I know it isn't on an alcohol engine. Found the alcohol was pooling on top of the disk. This was a throttle stop rpm of 4200 IIRC. After changing to a blade type, because 100 x better.

Floyd Gomez · 05-13-2009, 07:11 PM

Hey Lou, I lost your number. Give me a call when you get a chance please.

Chris Williams · 05-14-2009, 09:50 PM

Quote:

Originally Posted by S/G 386N

We had one of those disc style throttle stops on my dragster. It might be consistant, but I know it isn't on an alcohol engine. Found the alcohol was pooling on top of the disk. This was a throttle stop rpm of 4200 IIRC. After changing to a blade type, because 100 x better.

OK, I guess I wouldn't know about alcohol... I just drink that

05-08-2009, 09:48 PM	#2
S/G 386N Member Join Date: Sep 2008 Location: Fishers, IN Posts: 103 Likes: 0 Liked 0 Times in 0 Posts	Re: Throttle Stop Help!!! This should help you get started. http://www.biondoracing.com/tips.shtml#throttle It takes time though. Going to need quite a few runs to figure out your ratio. Then you have to figure out your ratio in relation to the weather as well. Everybody has their own opinion on how to tune the car to the throttle stop. I don't think there is a definate answer to how you should do it. I've always heard that you want to go on the throttle stop as early as possible, as this will bring your MPH up. I go on it at .1, but I know some that go on it as early as a few thousands. Shermon Adcock Jr. waits for closer to a second before going on, at least that's what I've heard. I ran against him in a time trial in Gainesville, and he was quite a ways ahead of me after launch, so I think it might be true. Either that, or he runs a much higher throttle stop RPM than I do. All you can do is make runs, and figure out what you are comfortable with. __________________ JJ Nance '06 Don Davis C5 Corvette Last edited by S/G 386N; 05-08-2009 at 09:57 PM.

05-09-2009, 05:14 AM	#3
Lou SG2340 Member Join Date: May 2008 Location: Disputanta Va (30 minutes from VMP) Posts: 122 Likes: 0 Liked 0 Times in 0 Posts	Re: Throttle Stop Help!!! I have found 1Stop to be the best throttle stop. It is an under the carb stop that takes away the linkage problems. Gary at 1Stop (319-277-5290) will spend as much time with you as necessary to help you with his stop. I turn my stop on at .02 & shift at .40. I set the rpm at 4100. Every car is different. You have to test & see what works for you.

05-09-2009, 12:27 PM	#4
Floyd Gomez Member Join Date: May 2009 Location: South Carolina Posts: 275 Likes: 0 Liked 0 Times in 0 Posts	Re: Throttle Stop Help!!! Lou, Does the under carb stop cause a big load in fuel?

05-10-2009, 05:29 AM	#5
Lou SG2340 Member Join Date: May 2008 Location: Disputanta Va (30 minutes from VMP) Posts: 122 Likes: 0 Liked 0 Times in 0 Posts	Re: Throttle Stop Help!!! No. I suggest you keep your stop speed over 4000 rpm. One of the hardest part of stop racing is to get a carb that does what you want it to while on the stop. If shifting by time, which is the best way, you want to hold a constant rpm. PM me your phone # if you want. I am leaving for Bristol Wed then going to Maple Grove. Lou

05-10-2009, 11:09 AM	#6
don R Member Join Date: Dec 2005 Location: Illinois Posts: 109 Likes: 0 Liked 0 Times in 0 Posts	Re: Throttle Stop Help!!! We just went from a linkage type to an under carb type. I was having a problem keeping the stop RPM consistent. #1 got us one quick and we stayed close to our original set-up. The first pass was close and the second was 8.904 which got us the first round bye. We made it to the third round Saturday and Sunday. Not yet perfect but better than last season and early this year.

05-08-2009, 08:20 PM	#1
Floyd Gomez Member Join Date: May 2009 Location: South Carolina Posts: 275 Likes: 0 Liked 0 Times in 0 Posts	Throttle Stop Help!!! Hey guys, I have always raced bracket or stock/super stock and am now moving into super gas. I have never run a stop and am more confused than a fat man at a vegetarian resturant. So many choices and types. And then there is the shifting questions, stop on or off. Somebody help. PLEASE

05-12-2009, 11:04 PM	#7
Chris Williams Member Join Date: Mar 2009 Location: Woodinville, WA Posts: 401 Likes: 0 Liked 0 Times in 0 Posts	Re: Throttle Stop Help!!! We run a Dedenbear TS6 which is an under carb disc type. We love it. It has both on and off CO2 lines, meaning you can control both on and off speed precisely. It's also amazingly consistent. We go on the stop immediately (0.00), run at 4000 on the stop, and shift on time (at 1 sec). Of course your mileage may vary. We run a dominator on a 565 BB. We go on the stop ASAP so that we can be the chaser, not the chasee, and run the max MPH. We tried shifting on RPM and found it just couldn't stay at a consistent RPM on the stop. It would just climb. And that made it impossible to predict. We shifted back to shifting on time, and it's laser straight (on the graph data) at 4000 throughout the entire time on the stop. Hope this helps, Chris __________________ Chris Williams 6304 SC, TD, ET

05-13-2009, 07:11 PM	#9
Floyd Gomez Member Join Date: May 2009 Location: South Carolina Posts: 275 Likes: 0 Liked 0 Times in 0 Posts	Re: Throttle Stop Help!!! Hey Lou, I lost your number. Give me a call when you get a chance please.