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Would WHP/tonne be more accurate when comparing acceleration??

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Old 24 June 2006, 05:12 PM
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Carl2
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Originally Posted by RB5_245
That's not the road that's lying though is it
The road doesn't do anything. It just sits there looking flat and black

It's the timing gear that does the lying. The Gtir times above are for a 1bar Gtir with about 280bhp that simply couldn't in this or any other world do a 1sec 60ft. The error is thought to be down to a very low car causing some part of the body other than the tyres to break the timing beam.

Originally Posted by York Raceway web site
Unless all of a sudden you're running an NHRA/IHRA spec Pro-Stock Car then I suggest that whoever is running the same spec as you is getting false 60ft times and thus false e/t's too.
A 1.08 60ft extrapolates to between a high 6 second to mid 7 second quarter mile.

Does he have a ridiculously low car or maybe something hanging down below the car that would stop the staging beams remaking? If so, does the track where the run in question was made use a "guard beam" in its timing system?
The guard beam is an extra sensor (emitter/reciever) which is around 16 inches after the "stage beam" which guards against excessive "rollout". What should happen when you stage is that you first break the "pre stage beam" and then about seven inches later you break the "stage beam". Because of the diameter of your tyre you will still be breaking the pre stage beam too. When the starter commences the start sequence, the timers start running as soon as the stage beam "remakes" its connection. The distance between you first breaking the stage beam and when it "remakes" (behind your front tyre) is known as your "rollout".
It may be that some cars have some excessively low bodywork or other obstruction underneath which stop the stage beam from remaking, maybe even until the rear wheel has gone through the beams, there are rules for minimum height behind the front wheel in place in drag racing to prevent this from happening. There are a few famous cases of this situation being used to cause false times in the past. A guard beam when used is placed 16 inches from the stage beam. If this beam is broken before the stage beam remakes the vehicle would be given a rollout foul and a red light (if the green is not already lit, otherwise it may just start the clocks). Of course if there is no guard beam it is difficult to know whether something has fouled the stage beam or not other than by comparing times of one particular vehicle with its other runs if only one run is suspected or with another similar vehicle if it is an ongoing problem. One tell tale would be an unusually high reaction time by an experienced driver. Although a driver who is racing in eliminations on a sportsman tree and uses the problem to his/her advantage (did I say cheats?) could just react earlier to the tree, maybe leaving on the second amber rather than the last, thus gaining possibly a car length on his/her opponent without pulling a cherry on the tree.
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