Throttle Stop Baseline Setup

Pony Pilot · 01-25-2015, 07:10 AM

After four trips to the track resulting in three opportunities to remove my trusty C-4 to replace clutches and bands, I finally gave in and bought a Powerglide for my SST car. Needless to say, I'm back at square 1 as far as my throttle stop combination. I've had one opportunity to test so far, and discovered I have a fair learning curve in front of me as far as what the Powerglide wants in the way of going on the stop and when to shift it. My test was on a 1/8th mile track. I did two all out passes; one at 5.87/116 and the other at 5.88/116, so it appears to be very consistent. First try on the stop was having TS1 set to come on at 0.3 sec; TS2 set for 2.5 sec. My goal was simply to find what RPM it wanted to be at on the stop. My initial goal was to get to 4,000 RPM. Shift was set for 7,000 RPM. The car didn't like this, as RPM on the stop dipped sharply to 3,400, but then accelerated during the remaining time on the stop as seen on my Racepak graph. The best pass I had was going on the stop at 0.3, shifting on time at 0.7 and an RPM on the stop of 4,400. The only issue I saw was a 400 RPM drop at the shift, otherwise the RPM on the stop was pretty stable. TS2 was kept at 2.5 seconds for all test passes. I realize graphs don't win races, but I was wondering if that is typical of a Powerglide car, or if I need to keep tweaking something? I figure that as long as the car does the same thing consistently, I should be able to work with it. I just thought some of you guys who have run powerglides a lot longer had any additional advice the might shorten my learning curve. Thanks for any input.

C and W Racing · 01-26-2015, 01:48 PM

What type of stop is it? air or electric? How heavy is the car?
Chuck

Pony Pilot · 01-26-2015, 06:38 PM

It's a 4-blade #1 Stop electric. Car weight is ~2,850 lbs. Graph pasted in to better show what I'm talking about.

01-26-2015, 01:48 PM	#2
C and W Racing Senior Member Join Date: Jul 2007 Posts: 554 Likes: 5 Liked 10 Times in 1 Post	Re: Throttle Stop Baseline Setup What type of stop is it? air or electric? How heavy is the car? Chuck

01-26-2015, 06:38 PM	#3
Pony Pilot Junior Member Join Date: Aug 2012 Posts: 25 Likes: 0 Liked 0 Times in 0 Posts	Re: Throttle Stop Baseline Setup It's a 4-blade #1 Stop electric. Car weight is ~2,850 lbs. Graph pasted in to better show what I'm talking about. Attached Thumbnails Last edited by Pony Pilot; 01-27-2015 at 06:35 AM. Reason: Adding Graph

01-25-2015, 07:10 AM	#1
Pony Pilot Junior Member Join Date: Aug 2012 Posts: 25 Likes: 0 Liked 0 Times in 0 Posts	Throttle Stop Baseline Setup After four trips to the track resulting in three opportunities to remove my trusty C-4 to replace clutches and bands, I finally gave in and bought a Powerglide for my SST car. Needless to say, I'm back at square 1 as far as my throttle stop combination. I've had one opportunity to test so far, and discovered I have a fair learning curve in front of me as far as what the Powerglide wants in the way of going on the stop and when to shift it. My test was on a 1/8th mile track. I did two all out passes; one at 5.87/116 and the other at 5.88/116, so it appears to be very consistent. First try on the stop was having TS1 set to come on at 0.3 sec; TS2 set for 2.5 sec. My goal was simply to find what RPM it wanted to be at on the stop. My initial goal was to get to 4,000 RPM. Shift was set for 7,000 RPM. The car didn't like this, as RPM on the stop dipped sharply to 3,400, but then accelerated during the remaining time on the stop as seen on my Racepak graph. The best pass I had was going on the stop at 0.3, shifting on time at 0.7 and an RPM on the stop of 4,400. The only issue I saw was a 400 RPM drop at the shift, otherwise the RPM on the stop was pretty stable. TS2 was kept at 2.5 seconds for all test passes. I realize graphs don't win races, but I was wondering if that is typical of a Powerglide car, or if I need to keep tweaking something? I figure that as long as the car does the same thing consistently, I should be able to work with it. I just thought some of you guys who have run powerglides a lot longer had any additional advice the might shorten my learning curve. Thanks for any input.