Timer 2 caculation
 

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!!!

Re: Timer 2 caculation
 

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

Rick

Re: Timer 2 caculation
 

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?

Re: Timer 2 caculation
 

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

Re: Timer 2 caculation
 

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 ?

Re: Timer 2 caculation
 

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.

Re: Timer 2 caculation
 

Straightliner,

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

Re: Timer 2 calculation
 

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

Re: Timer 2 caculation
 

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

Re: Timer 2 caculation
 

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

Re: Timer 2 caculation
 

As far as I know it was .067 per 1000 feet.

Re: Timer 2 caculation
 

Could you define a "tad" high? Rick and I both run super comp and I know my ratio is around 2.8 to 1. I would consider 8 to 1 to be excessively high, but maybe in a heavier SST car the ratio will be higher considering the weight of the car and the HP of the car. What kind of ratio, and what kind of MPH do you run with your car? The car in question ran a 10.75 with only .6 in the timer 2 so it doesnt appear to have a lot of extra HP. Maybe it needs that much ratio to work. According to his posted numbers, the ratio he came up with appears to work. What does the car in question weigh and what does it run full out? I was looking at some of your posts in other topics and should ask you are you using the 3 speed or glide and are you shifting on time or by rpm?Also, what is your first timer?

Re: Timer 2 caculation
 

3500lbs, 3 speed turbo 400, so far it has gone 10.42 there is a bit more there but I need to get out to a test and tune day to find out.

540 bbc 700 hp crate engine. stop on @.300. Shifts into 2nd by time and into 3rd by rpm.