Posted By: John Burdine
difference in 60 ft tripping clocks w/front or back - 06/12/09 04:28 PM
how much difference have you seen between tripping the 60 ft clocks on the back tires opposed to tripping with the front.
difference in 60 ft tripping clocks w/front or back
Posted By: B3422W5
Re: difference in 60 ft tripping clocks w/front or back - 06/12/09 04:56 PM
usually about a 1/10
Posted By: Dale
Re: difference in 60 ft tripping clocks w/front or back - 06/12/09 05:35 PM
My car normally would go 1.27 and on a long wheel stand will 1.40.
Posted By: B3422W5
Re: difference in 60 ft tripping clocks w/front or back - 06/12/09 05:48 PM
Quote:
My car normally would go 1.27 and on a long wheel stand will 1.40.
i have seen close to that a few times as well....
the last time i did it, the car went 1.341 the previous pass,not tripping with the backs
on the next pass the car only ran a hundredth different(9.86/9.85) and went 1.459 on the back tires.
Most often a 1/10 but i have had it like the above as well also, almost .12
Posted By: 440Jim
Re: difference in 60 ft tripping clocks w/front or back - 06/12/09 07:28 PM
I have done it more times than I care to admit. It tends to be 0.10 second on my car. The wheel base (front to back) and the tire diameters (front and back) will make a difference. And of course if it stands straight up, that will effect things more than just carrying the front tires that distance.
Posted By: Al_Alguire
Re: difference in 60 ft tripping clocks w/front or back - 06/13/09 12:42 AM
Well for me it is about a .07 difference. But then again it is arguable as to what is tripping the beams. My best with wheels up, as in the photo I posted a few days ago is 1.27 and without is 1.20. Still a turd in the 60 for a 8teen car. Hope to help that out soon with a gear change.
Posted By: nhramark
Re: difference in 60 ft tripping clocks w/front or back - 06/13/09 03:18 AM
Right at a tenth for me too.
Posted By: SB412DUSTER
Re: difference in 60 ft tripping clocks w/front or back - 06/13/09 03:22 AM
Quote:
Right at a tenth for me too.
Me too
Posted By: Cudafied
Re: difference in 60 ft tripping clocks w/front or back - 06/13/09 03:53 AM
Quote:Quote:
Right at a tenth for me too.
Me too
Me three
Posted By: Al_Alguire
Re: difference in 60 ft tripping clocks w/front or back - 06/13/09 04:30 AM
I wish it was a tenth for me. Something other than the front tires nets me high 1.20's everytime.
Posted By: MR_P_BODY
Re: difference in 60 ft tripping clocks w/front or back - 06/13/09 05:05 AM
440Jim and myself figured mine one time and on my
short wheel base it was something like .05(I believe)
short wheel base it was something like .05(I believe)
Posted By: 69CHARGERMD
Re: difference in 60 ft tripping clocks w/front or back - 06/13/09 10:02 AM
I wish i had this problem.........ie, tripping the light with the rear tire... 
Posted By: 440Jim
Re: difference in 60 ft tripping clocks w/front or back - 06/13/09 12:52 PM
Quote:
I have done it more times than I care to admit. It tends to be 0.10 second on my car. The wheel base (front to back) and the tire diameters (front and back) will make a difference. And of course if it stands straight up, that will effect things more than just carrying the front tires that distance.
This attachment show one way to estimate the effect due to distance change from the front to the back tire. The distance "d" is needed, not the wheelbase "w". The beam height "b" and the tire diameters "r1" and "r2" make "d" less than "w". This assumes the same mph at the sixty foot mark. And the car may slow down more if the wheel stand is very high.
But I can't find the details of how we estimated "d". You can estimate the mph from your normal sixty foot time:
mph = 2 x 60/time x3600/5280
Ex:
2 x 60/1.25 x 3600/5280 = 65 mph
This assumes the acceleration is constant (which it is not), and the speed at the mark is twice the average speed (which is what this calculates).
Posted By: 451Guy
Re: difference in 60 ft tripping clocks w/front or back - 06/13/09 07:55 PM
Jim,
No offense but I think you are just way to smart for the rest of us!!! If I ever tripped the 60' clock with the back tires I would not be able to talk due to the joker type smile on my face!
No offense but I think you are just way to smart for the rest of us!!! If I ever tripped the 60' clock with the back tires I would not be able to talk due to the joker type smile on my face!