Make some test laps with the throttle stop last night

[HR 9505]

I got a chance to finally test out the throttle stop last night for the first time. I made a flat out pass and went 6.48 at 105 mph, I then set the timers up as follows - on at .300 off at 1.70 shift at .5 and the car ran a 7.23. I go back and make another pass with the following - on at .300 off at 1.2 shift at .5 and ran a 7.14. I then did some crude math and came up with about a 5.5 to 1 ratio. I then moved my timer one to .2 and timer 2 to .5, shift at .4 and ran a 6.999. I left everything alone for the next pass to check consistancy but they sprayed the track on me and it picked up .06 in the 60' and ran a 6.94.

My question is.......am I ok with not being on the stop all that long? I have a heavy car (3500#) so shifting it on the stop really knocks the breath out of it.

By the way.....all these runs were set at 4500 rpm cruise

What are everyone's thoughts? I feel like I'm close but I'm new to this and want some opinions.

Thanks,
Jason McLawhorn

[Ken MacNicol]

I would lower the stop RPM a little, so you can put some more time in it.

[Bob Verwold]

My coast rpm is about 4300 but my car isn't that heavy. Also I don't have the HP to shift on the stop so I come off in first gear and deal with it.
You'll find that there a million things that you'll need to change numbers ( weather, track prep, two hrs in lanes and on and on) but you only want to change the "off the timer number" after you get the other numbers and coast set.

[Ron Finney]

Don't get caught up in the "have to have a lot of time in the stop" game. Just because many people do, it isn't necessary if you are set up right. I run as little as 2 tenths to as much as 8 tenths of a second in the stop and have for years in Super Comp. Running the number is not the problem (most of the time). They told me being a slow car to go on the stop at .3 which is what I did for a few years, and it worked great. I now go on the stop at .15 just to get the front wheels out of the air. My altered gets squirrely if it comes up to high. The sooner you go on the stop, the sooner you are off and can run more MPH. That is what most people are after. Stop RPM should be around 4100 to 4200. The rest is just adding/subtracting time to get your number right. I think you will probably find that your ratio will be about 2:1. Meaning two hundreths in the timer will get you 1 hundreth on the track. I actually won the Divisional in Stanton with .05 in the stop. The weather station was predicting negative numbers.....oh yeah, I also got the perfectly strange award in the 4th round of that race.


Good Luck!

Ron

[HR9121]

Originally Posted by Ron Finney

Don't get caught up in the "have to have a lot of time in the stop" game. Just because many people do, it isn't necessary if you are set up right. I run as little as 2 tenths to as much as 8 tenths of a second in the stop and have for years in Super Comp. Running the number is not the problem (most of the time). They told me being a slow car to go on the stop at .3 which is what I did for a few years, and it worked great. I now go on the stop at .15 just to get the front wheels out of the air. My altered gets squirrely if it comes up to high. The sooner you go on the stop, the sooner you are off and can run more MPH. That is what most people are after. Stop RPM should be around 4100 to 4200. The rest is just adding/subtracting time to get your number right. I think you will probably find that your ratio will be about 2:1. Meaning two hundreths in the timer will get you 1 hundreth on the track. I actually won the Divisional in Stanton with .05 in the stop. The weather station was predicting negative numbers.....oh yeah, I also got the perfectly strange award in the 4th round of that race.


Good Luck!

Ron

Couldn't agree more on this one, most of the time I'm only on the stop .4 to .6 the only thing that matters is getting it to be consistent. Sounds easy but it takes time to get the data you need, I'm still trying to figure it out some days. Just when I think I got it, it will throw some stupid number in the board but that's throttle stop for you.