Reaction time?

Rev · 02-14-2003, 09:34 PM

At Houston Raceway Park, with the sportsman tree, .5000 is a perfect RT. Some other tracks call a .000 a perfect RT. How is the .5000 second RT measured? Thanks for any info.

Rev

GoPed2009 · 02-15-2003, 01:03 AM

hope it helps, dont kno if its all right but its stuff ive learned here and there

Once both vehicles are staged, the "tree" is activated and the first amber colored bulbs on both sides of the tree light up. Then ½ second later the next amber bulb lights up while the first amber bulb goes out. Another ½ second later the last amber bulb lights up. And one-half second later the green bulb lights up signaling the drivers to start the race.

the tree counts down at .500 second (five tenths) intervals. The reaction time announced is the time that the vehicle took to move off of the starting line compared to when the last amber bulb lit up.

Rev · 02-16-2003, 11:21 PM

That's what I thought, but couldn't figure out why it didn't go from green on for the time?. I guess they need a positive number, right?

Rev

Joel 98 GT · 02-20-2003, 12:07 AM

Actually, reaction time is measured from the green light. The reaction timer starts when the green light comes on and stops when the car leaves the starting line. Nhra started using a new system this year that still measures reaction time in the same manner, it just uses .000 as a perfect light.

Miss Mischief · 02-24-2003, 07:46 AM

The Tree was a Mistery Too

But what I was Told was that from the Red "Holding stage" after the "Lights Drop" from .750-.250 The .250 Is Old school Because its a 1/4 second Like 1/4 Mile.

Make sure you Listen to the car Next to you if you Didnt Look at Her Tail Skirt For Duals and Listen for the loop at Idle and the Rev You May Be playing with Fire. Low 12's Consistent, Badge's Dont mean anything.

Miss Mischief · 02-24-2003, 07:55 AM

Quote:

Originally posted by Joel 98 GT
Actually, reaction time is measured from the green light. The reaction timer starts when the green light comes on and stops when the car leaves the starting line. Nhra started using a new system this year that still measures reaction time in the same manner, it just uses .000 as a perfect light.

A perfect tree Is .000 Only when the Green has Landed However this Can be Offset for Mix Matched races IE. Nitrous Blown short block VRS Natural Asperation Big Block, a Handicap.

I Only Know One thing for sure I dont Know Sh it I will Never Know Sh it So I can defently Be wrong.

02-14-2003, 09:34 PM	#1
Rev Registered Member Join Date: Nov 1998 Location: Houston, Tx. Posts: 3,887	Reaction time? At Houston Raceway Park, with the sportsman tree, .5000 is a perfect RT. Some other tracks call a .000 a perfect RT. How is the .5000 second RT measured? Thanks for any info. Rev __________________ '66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi. O.B.C. #2 '66 coupe

02-15-2003, 01:03 AM	#2
GoPed2009 Registered Member Join Date: Sep 2002 Location: Bradenton, Fl Posts: 9	hope this helps hope it helps, dont kno if its all right but its stuff ive learned here and there Once both vehicles are staged, the "tree" is activated and the first amber colored bulbs on both sides of the tree light up. Then ½ second later the next amber bulb lights up while the first amber bulb goes out. Another ½ second later the last amber bulb lights up. And one-half second later the green bulb lights up signaling the drivers to start the race. the tree counts down at .500 second (five tenths) intervals. The reaction time announced is the time that the vehicle took to move off of the starting line compared to when the last amber bulb lit up. __________________ Ben Renner

02-16-2003, 11:21 PM	#3
Rev Registered Member Join Date: Nov 1998 Location: Houston, Tx. Posts: 3,887	Thanks GoPed2009 That's what I thought, but couldn't figure out why it didn't go from green on for the time?. I guess they need a positive number, right? Rev __________________ '66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi. O.B.C. #2 '66 coupe

02-20-2003, 12:07 AM	#4
Joel 98 GT Registered Member Join Date: Nov 1999 Location: Jacksonville,Florida,USA Posts: 13	Actually, reaction time is measured from the green light. The reaction timer starts when the green light comes on and stops when the car leaves the starting line. Nhra started using a new system this year that still measures reaction time in the same manner, it just uses .000 as a perfect light. __________________ Joel Mackenzie 98 GT N/A"With a Few Bolt on's" M/M # A263

02-24-2003, 07:46 AM	#5
Miss Mischief Registered Member Join Date: Feb 2003 Location: Still Ugly as ever Posts: 111	Maybe Im right Maybe Im wrong The Tree was a Mistery Too But what I was Told was that from the Red "Holding stage" after the "Lights Drop" from .750-.250 The .250 Is Old school Because its a 1/4 second Like 1/4 Mile. Make sure you Listen to the car Next to you if you Didnt Look at Her Tail Skirt For Duals and Listen for the loop at Idle and the Rev You May Be playing with Fire. Low 12's Consistent, Badge's Dont mean anything. __________________ Miss Mischief RHC#153 Proud to carry the Card 2000 V-6 5 speed Frame Braces [Steeda] [Wanna be Cobra] 17" Rims with Kuhmo 245's 5 Spoke Gunmetal finish [Power Dyne] Blower Unpolished 6 psi {Mods to Come} [Steeda] Springs slightly lower then stock [Steeda] Anti sway bars front and rear. 1999 Jeep Cherokee Big six 5 speed Infinty Bose steroe Lots of Creatures Comforts [Mods] Brush/ Push bar Full length Welded and Bolted , Tow Hook Front and Rear 30" Goodyear AT's .

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