Throttle Stop Ratios

reknapp52 · 03-06-2012, 03:28 PM

I have noticed that with my car, if I run quite a ways off the index (say 4 to 5 tenths), the ratio required is quite different to get on the index than what is required for a run that is pretty close ( a few hundredths). Any comments/similar findings??

Henry S · 03-06-2012, 05:50 PM

I would venture a guess that your stop RPM is creeping up when you are on the slow side and more stable when your on the quick side. that RPM creep will change your ratios. You will need to make sure you have the same stop RPM no matter what altitude you run at. I know in Div 5 that means constant adjustment for each track and conditions. getting a handle on that portion has helped my program in the past.

reknapp52 · 03-06-2012, 07:08 PM

Thanks for the input Henry, and I think that you're probably right--up until recently I was shifting out of low gear AFTER coming off the stop, and I imagine that would contribute to having a RPM creep problem. I learn a little more each year about this class, but still haven't learned enough! What's new with you--looks like you're running a Super Stocker these past couple seasons??

Leroy Duran 7118 · 03-07-2012, 10:28 PM

2 speed car or 3?

reknapp52 · 03-08-2012, 09:57 AM

It's a powerglide.

Henry S · 03-09-2012, 11:14 AM

Yeah, the superstock car is a blast to drive. love doing those wheelstands. it is so smooth. Superstock racing is the complete oposite of super class racing. In superstock, the car launches hard through the first part of the track and levels off at the end. in super class racing the first part of the track is slow(due to throttle stopping) and the back half comes on strong. I am contemplating bringing out the superstreet car again and maybe run both. of you need help looking at your data or ratios. come find me in the pits and i will help with what i can.

sst5167 · 03-10-2012, 09:29 AM

Quote:

Originally Posted by Henry S

Yeah, the superstock car is a blast to drive. love doing those wheelstands. it is so smooth. Superstock racing is the complete oposite of super class racing. In superstock, the car launches hard through the first part of the track and levels off at the end. in super class racing the first part of the track is slow(due to throttle stopping) and the back half comes on strong. I am contemplating bringing out the superstreet car again and maybe run both. of you need help looking at your data or ratios. come find me in the pits and i will help with what i can.

DO IT HENRY! I would love to see "Mr. Scary" out racing where it belongs again!

03-06-2012, 03:28 PM	#1
reknapp52 Junior Member Join Date: Nov 2008 Location: Cascade, CO Posts: 48 Likes: 22 Liked 7 Times in 5 Posts	Throttle Stop Ratios I have noticed that with my car, if I run quite a ways off the index (say 4 to 5 tenths), the ratio required is quite different to get on the index than what is required for a run that is pretty close ( a few hundredths). Any comments/similar findings??

03-06-2012, 05:50 PM	#2
Henry S Junior Member Join Date: Aug 2007 Posts: 83 Likes: 11 Liked 19 Times in 7 Posts	Re: Throttle Stop Ratios I would venture a guess that your stop RPM is creeping up when you are on the slow side and more stable when your on the quick side. that RPM creep will change your ratios. You will need to make sure you have the same stop RPM no matter what altitude you run at. I know in Div 5 that means constant adjustment for each track and conditions. getting a handle on that portion has helped my program in the past.

03-06-2012, 07:08 PM	#3
reknapp52 Junior Member Join Date: Nov 2008 Location: Cascade, CO Posts: 48 Likes: 22 Liked 7 Times in 5 Posts	Re: Throttle Stop Ratios Thanks for the input Henry, and I think that you're probably right--up until recently I was shifting out of low gear AFTER coming off the stop, and I imagine that would contribute to having a RPM creep problem. I learn a little more each year about this class, but still haven't learned enough! What's new with you--looks like you're running a Super Stocker these past couple seasons??

03-07-2012, 10:28 PM	#4
Leroy Duran 7118 Junior Member Join Date: Mar 2009 Posts: 33 Likes: 0 Liked 0 Times in 0 Posts	Re: Throttle Stop Ratios 2 speed car or 3? __________________ Leroy Duran 7118 STK, ST, SG

03-08-2012, 09:57 AM	#5
reknapp52 Junior Member Join Date: Nov 2008 Location: Cascade, CO Posts: 48 Likes: 22 Liked 7 Times in 5 Posts	Re: Throttle Stop Ratios It's a powerglide.

03-09-2012, 11:14 AM	#6
Henry S Junior Member Join Date: Aug 2007 Posts: 83 Likes: 11 Liked 19 Times in 7 Posts	Re: Throttle Stop Ratios Yeah, the superstock car is a blast to drive. love doing those wheelstands. it is so smooth. Superstock racing is the complete oposite of super class racing. In superstock, the car launches hard through the first part of the track and levels off at the end. in super class racing the first part of the track is slow(due to throttle stopping) and the back half comes on strong. I am contemplating bringing out the superstreet car again and maybe run both. of you need help looking at your data or ratios. come find me in the pits and i will help with what i can.