Clueless
 

Not sure this the right spot but question about E.T.
If a car makes a normal 1/8 mile pass scoreboard shows 5.50
Same car second pass when he nails the throttle is goes skyward above sixty timer above 330 timer traveling at the same rate of speed lands back down right and through mph and finish line cone what does the scoreboard read?
Terry

Re: Clueless
 

Terry

There is no way to know without more information. One would need data logging of the G's / acceleration through both runs.


Stan

Re: Clueless
 

If it all happened at same elapsed time would the scoreboard read same et with no 60 or 330?

Re: Clueless
 

even if it ran same ET and MPH the incrementals would be wrong...
(as in not the same as the pass before)
Other than that who knows...

Re: Clueless
 

Let me rephrase do any cones between start and fishline have any effect of final et and mph? So if you made two identical but the faster car in the other lane took out the 60 and 330 cones would the scoreboard still show the same et and mph?

Re: Clueless
 

I was thinking everything between start and finish line were just reference points but not need for scoreboard to read the et and mph. I know the time slip would be screwed up.

Re: Clueless
 

You can remove all reflectors except finishline and et will be the same. G Meter for sure or driveshaft counter would verify.

Re: Clueless
 

Thanks
So it doesn’t matter what the 60’ timers read from two identical passes are the same.
Terry

Re: Clueless
 

I didn’t think any of the middle timers mattered for et but my car has been parked several years so I thought I would check. This all sounded better in my head than when I reread it guess I’m going to need to stop listening to those sounds.

Re: Clueless
 

You must have never raced at some of the lower level tracks where timing system problems are common. Have raced where the middle timers and suck didn't work, we still bracket raced but it's tougher to dial the car. MPH is figured from the 594' to the 660' in 1/8mi timing, I don't remember the footage in 1/4.

Re: Clueless
 

I was interested in et at finish line only and if any of the timers from start to finish were needed for scoreboard to show it.
Terry

Re: Clueless
 

The intermediate timers have nothing to go with the finish line et timer. Does not matter if they work or not.

Re: Clueless
 

Thanks everyone
Terry

Re: Clueless
 

MPH in the quarter used to be 66' before and 66' after the 1/4 et stripe. They changed it years ago to only 66' before the stripe.

Re: Clueless
 

Speaking of the 594' mark, does anybody know why it's 66ft? If the only thing it does is serve as a reference time to calculate speed based on the time it takes to traverse that span, why is it 66 feet? Why not 10 or 20? Seems arbitrary to me.

66ft would be 1/10 of an 1/8th mile and 1/20 of a 1/4 mile, but you could easily use any increment you want. I don't know why the people who invented timing systems used that distance and I've never been able to see why in all my research.

Re: Clueless
 

Ya: So originally it was 132' which of course is 1/10th of the quater mile. Wally set all that up. Easier to calculate in the late 50's ?