DRAG RACERS - TWM CALCULATION

[Hammer]

This ones for hard core drag racers who want to see how far ahead or behind you were at the win stripe.

Car one RT + ET -DIAL = TRUE WIN MARGIN (TWM)
Car two - RT + ET - DIAL

TWM (1.47) WINNING MPH = DISTANCE WINNING CAR WAS AHEAD AT THE STRIPE

Try it when the NHRA races start again and you'll see it works perfect. Of course there won't be a dial in the pro ranks, so just use the ET and RT of the cars or bikes.

[flyin ryan]

I use that all the time. Can't believe how many people are shocked when I show them...just makes sense .

[Hammer]

Originally Posted by flyin ryan

I use that all the time. Can't believe how many people are shocked when I show them...just makes sense .

I'm not at all surprised you know this calc Ryan.

[4DSZR1]

Interesting

John could you please show an example?

Let me see if I get it. The first calc is to get a time. the second calc then turns it into feet?

(TVM 1.47) 135mph = 198.5

I don't think I'm getting it

Thanks

Rick

[Hammer]

You bet Rick. Below is a real example of a race I won in 2006 with #458. The round I am using is the last round. Long story why the dial in on the car doesn't match the dial-in I show below, well not that long. I'll save that for later though.

The formula actually should have been as below:

Car one RT + ET -DIAL = Losing Car
Car two - RT + ET - DIAL = Winning Car
= TRUE WIN MARGIN (TWM)

TWM (1.47) WINNING MPH = DISTANCE WINNING CAR WAS AHEAD AT THE STRIPE

Car 1-THEM .115+13.204-12.98 = .339
Car 2 - ME -.058+13.678-13.45 = .286
TWM = .339 -.286 = .053 (I went across .053 secs before the other guy)

CALC .053 (1.47) 106.43 = 8.29'

So I went across the finish line 8.29' ahead of the other car in that race. Most tracks show the TWM or MOV (Margin of Victory) at the bottom of the timeslip. You can take that and plug it into the formula. Margin of Victory shown on the slip of the race above was .0535, so the timers are showing the MOV/TWM to 4 places instead of the calculated 3 places I show in the formula.

If you were to race all the time, and used this formula, you would crap at how close races can be. I have won and lost races by less than an inch a number of times.

Hope this helps Rick. Let me know.

[4DSZR1]

Thanks John,

Makes sense now, 100% Cool stuff.

Hope you had a nice Christmas and wish you a Happy New Year

[Dynomite]

Originally Posted by Hammer

Below is a real example of a race I won in 2006 with #458.

So I went across the finish line 8.29' ahead of the other car in that race. Most tracks show the TWM or MOV (Margin of Victory) at the bottom of the timeslip. You can take that and plug it into the formula. Margin of Victory shown on the slip of the race above was .0535, so the timers are showing the MOV/TWM to 4 places instead of the calculated 3 places I show in the formula.

I have won and lost races by less than an inch a number of times.

I am not familiar with this calculation but if your top speed across finish line was 106.43 mph you were going 156.0973 ft in a second. Or in .0535 seconds you went 8.35 ft.

Now....does this not assume you were averaging 106.43 mph in that 8.35 ft when in fact your average speed in that increment of distance was a bit less

Again...I may be in way over my head here ....no do not say it Hammer ...I know what you are thinking

This would not make any difference here, but if you beat the guy by a second.....maybe it would Or if you are getting winning distance numbers within an inch...I would say you might be more than an inch off

Or your LT5 crapped out and you were no longer accelerating

[Hammer]

Originally Posted by Dynomite

I am not familiar with this calculation but if your top speed across finish line was 106.43 mph you were going 156.0973 ft in a second. Or in .0535 seconds you went 8.35 ft.

Now....does this not assume you were averaging 106.43 mph in that 8.35 ft when in fact your average speed in that increment of distance was a bit less

Again...I may be in way over my head here ....no do not say it Hammer ...I know what you are thinking

This would not make any difference here, but if you beat the guy by a second.....maybe it would Or if you are getting winning distance numbers within an inch...I would say you might be more than an inch off

Or your LT5 crapped out and you were no longer accelerating

What? Just kidding.

I think I might have been going a little faster than the 106.43, as that MPH is an average over the last 66' of the 1/4 mile, not the last 8.35'.

Great comments...but... this calc seems to be accurate...enough for the NHRA, plus I like it when I win by inches, or lose by inches.

[Dynomite]

Originally Posted by Hammer

What? Just kidding.

I think I might have been going a little faster than the 106.43, as that MPH is an average over the last 66' of the 1/4 mile, not the last 8.35'.

Great comments...but... this calc seems to be accurate...enough for the NHRA, plus I like it when I win by inches, or lose by inches.

See....I told you I was over my head ......I did not know the MPH was average over last 66 ft

[Hammer]

Originally Posted by Dynomite

See....I told you I was over my head ......I did not know the MPH was average over last 66 ft

No problem at all. You can actually place the blocks as far away as 132' (off road races) and as close as 6 feet and get a mph. We were using 6' at 330' street races in Winnemucca, Nevada. NHRA and all their tracks use the 66 foot placement. Don't ask me why though.

New Avatar just for you Dynoman...