Timer 2 caculation

[Straightliner]

Once I figure out my throttle stop factor/ratio. Where do I find how to do the actual math to know how much time to add or subtract from timer 2. I know you guys know how to do it but who taught you in the first place? I can't find it anywhere.

Thanks, I'm still learning!!!

[Rick Bailey]

Go to Biondo's web site, the is some great info there ! you'll learn all you need to know there.....

Rick

[Straightliner]

I have been there and read all of it. He tells you how to figure out your ratio. I'm asking where it's posted about the math to figure out how much time needed to run a 10.90 something. Example I had timer 2 set at .6 and I ran a 10.75, now I want to run a 10.90. my car has a ratio of 8:1. What's the math?

[Rick Bailey]

8 to 1..... ? wow ! you might check that. however,

you need 15 hun of et change..... so you would use your 8. 8 x 15 = 120 add the 120 to your .6 to slow the car.

Most ratios are .... 2.0 to 3.0 depending on combo.


tell us what you have maybe we can help....


Rick

[Bob Verwold]

Originally Posted by Straightliner

I have been there and read all of it. He tells you how to figure out your ratio. I'm asking where it's posted about the math to figure out how much time needed to run a 10.90 something. Example I had timer 2 set at .6 and I ran a 10.75, now I want to run a 10.90. my car has a ratio of 8:1. What's the math?

I'm with Rick, I think your a tad high on your number. The best thing is seat time and good records.
You won't be able to slap up 10.900's all the time.
Do you have a good weather station ?

[Straightliner]

Originally Posted by Rick Bailey

8 to 1..... ? wow ! you might check that. however,

you need 15 hun of et change..... so you would use your 8. 8 x 15 = 120 add the 120 to your .6 to slow the car.

Most ratios are .... 2.0 to 3.0 depending on combo.


tell us what you have maybe we can help....


Rick

I was getting help from some seasoned 10.90 racers. They came up with 8:1 after I made some passes with a little time then a lot of time in the box. I agree it sounds high and I may have to revisit that but the math was responding with that ratio for that weekend.

Rick who taught you the calculation to figure it out? Am I missing the fact that it's a standard math equation? Or is it customized for this application?

They used different math!! I have to wait 'til I get home and I will let you know his math. Bare with me.

Thank you in advance.

[RacingRicki]

Straightliner,

Post up your times and the weather conditions and I will enter it into my software. It will tell you the ratio.

[Rick Bailey]

Yes , as RR said I can do the same for you.

I also would like to know what your stop rpm is, this is where the big ratio number may be coming from, again depending on your combo this number will be in the range of 3800 - 4400

the math is , a standard equation, ratio number x et change, however you must have the correct ratio.

Then your next step is change in the air .... but we'll go one step at a time

Rick

[Straightliner]

Small problem, I didn't have a weather station yet. He was using his, I do have the DA from his notes.

Stop rpm- 4000, Ratio from notes is 8.7:1. I only have times using the stop. They were as follows:

10.993- 3400 DA- 1.860 timer 2
10.923- 2400 DA- 1.860 timer 2
10.877- 2400 DA- 1.460 timer 2
10.903- 2400 DA- 1.660 timer 2

His math was- 10.90-10.8777=.023. .023x8.7=2.00. Old timer 2 # of 1.460+.200=1.660 is new timer 2.

Thanks guys I purchased a weather station and Crew chief Pro for next season.

Brad

[Rick Bailey]

I see there was a thousand ft differance in air, did that also end up in your ratio ?