Bracket Talk
Reaction time question
June 12, 2018, 07:47 PM
KWigReaction time question
Have any of you ever measured RT differences by rear tire pressure ? As in, 1/4 lb=.002 or ?
Maybe it’s more toward cars with solid front suspension. Does quicker ET make a bigger difference?
Thanks !
You have to put in the effort, to get anything out of it.
June 12, 2018, 07:54 PM
442OLDSJust my opinion,but I think the driver's reaction time will vary at least .002 to ever prove that the tire pressure was worth .002.
I'm sure some will chime in that their personal reaction times are always within .001,but certainly not mine.
June 12, 2018, 08:12 PM
racerdude2054Agreed, unless you can hit 20 reaction times in a row within .002 then there is no way to tell a difference in reaction time based on rear air pressure.
You can change front tire air pressure in a door car enough to see a difference, but if you can tell anything less than .010 consistently then bravo
June 12, 2018, 08:46 PM
Curly1.002 is out of my margin of error. lol.
https://postimg.cc/gallery/np3zpruo/"Dunning-Kruger Effect"
-a type of Cognitive bias where people with little expertise or ability assume they have superior expertise or ability. This overestimation occurs as a result of the fact that they do not have enough knowledge to know they don't have enough knowledge.
Before you argue with someone ask yourself, "Is this person mentally mature enough to grasp the concept of a different perspective?" If not there is no point to argue.
4X NE2 CHAMPION. 2020 TDRA NE2 Champion
June 12, 2018, 09:07 PM
TORQINIf I set up 010..i can be 000 to 020...just me...the lower the tire the slower the reaction will be is my thought. I can not tell how much per psi with accuracy.
June 12, 2018, 09:10 PM
smokinjeffFront tires yes. Rear tires yes. But measuring to .002 with so many variables then it is just if you think it does then you have peace of mind and are a badazz On the starting line.
Jeff McClure
June 13, 2018, 07:16 AM
KWigSorry, I used that 002 just for an example. I was wondering if anyone had any correlation for pressure adjustments, and saw a difference in RT, by the rear tires wrapping up.
My wording things, on forums, has never been as elequent as most of you.
You have to put in the effort, to get anything out of it.
June 13, 2018, 09:46 AM
Lenny5160I think we can safely say that more pressure will react more quickly given equal traction, but there are way too many variables for there to be a rule of thumb. Wheel size, tire size, sidewall construction, rim screws, beadlocks, etc. Then there are the human variances of staging and reaction.
Tony Leonard
June 13, 2018, 11:08 AM
Boucher Jrna it dont change a thing. unless you run helium in your slicks like the hitters did back in the day...
June 13, 2018, 11:30 AM
Curly1Lowering the pressure does slow reaction time some but I could not tell you exactly how much.
I always keep my slicks the same and work with front tire pressure and RPM.
https://postimg.cc/gallery/np3zpruo/"Dunning-Kruger Effect"
-a type of Cognitive bias where people with little expertise or ability assume they have superior expertise or ability. This overestimation occurs as a result of the fact that they do not have enough knowledge to know they don't have enough knowledge.
Before you argue with someone ask yourself, "Is this person mentally mature enough to grasp the concept of a different perspective?" If not there is no point to argue.
4X NE2 CHAMPION. 2020 TDRA NE2 Champion
June 14, 2018, 10:42 PM
BrktracerYes, it makes a difference. I've never done enough testing to know how much. Usually, just set the rears for the best traction and adjust the front for r/t. I don't think .01 to .02 difference is impossible, but at some point loss of traction negates r/t advantage.
Matt Ward
June 15, 2018, 08:37 AM
BuckyOn both jr's and big cars rear tire pressure changes can make a significant rt difference.
however, you have to change pressure enough that generally the suspension isn't working correctly. Choose rear tire pressure to keep the suspension happy. But obviously if you run them low enough to wad them up, it lengthens the rt.
Foxtrot Juliet Bravo
June 15, 2018, 11:20 AM
Rob7181I have been footbraking for nearly 30 years, and can tell you that rears make a huge difference. It comes down to physics. If a tire wrinkles, then it takes time before it moves (delay) the more it has to wrinkle from having less air, the longer it will sit still before moving.
Rob Robertson
June 15, 2018, 12:33 PM
FootbrakeJimquote:
Originally posted by Brktracer:
Yes, it makes a difference. I've never done enough testing to know how much. Usually, just set the rears for the best traction and adjust the front for r/t. I don't think .01 to .02 difference is impossible, but at some point loss of traction negates r/t advantage.
^^^ THIS.
Dan "Jim" Moore
Much too young to feel this damn old!!