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Old 08-01-2010, 07:00 PM   #1
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Default Front tire size vers reaction time

I need to get a faster car reaction time for my driver. We currently have a 4.5" x 28" tall front tire and was thinking of going to a 26 " tall and then go from there to fine tune it with the t-brake button or tire air pressure. Our car just runs bottom 10's on a full tree no box.
What would I typically expect to see in time reduction from the reduced roll out?
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Old 08-01-2010, 07:04 PM   #2
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Default Re: Front tire size vers reaction time

How much are you looking to gain ?
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Old 08-01-2010, 07:19 PM   #3
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Default Re: Front tire size vers reaction time

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What would I typically expect to see in time reduction from the reduced roll out?
you will see your RT decrease exactly the amount that you ET will increase.... My guess is a few hundreths, if you get .03 then thats a nice chunk of RT. I've always run a 25 - 25 1/2 inch tire just to have that few hundreths already. It's easier to slow a RT down then to get it faster....
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Old 08-01-2010, 07:40 PM   #4
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Default Re: Front tire size vers reaction time

It is hard to tell how much we need but I think my son over compensates with the bad reaction times. He has no red lights, just shitty lights and I was thinking that a shorter tire would get him closer to his eye to t-brake release.
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Old 08-01-2010, 10:31 PM   #5
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Default Re: Front tire size vers reaction time

Limiting front end travel also quikens car reaction time.
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Old 08-01-2010, 10:42 PM   #6
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Default Re: Front tire size vers reaction time

If the driver is not staging consistently every time, changing the front tires will not help.
The driver must be consistent first.
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Old 08-01-2010, 10:54 PM   #7
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Default Re: Front tire size vers reaction time

how much time per week does he spend on a practice tree? If the driver isn't consistant, no sense in spending money trying to fix the car...
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Old 08-01-2010, 10:58 PM   #8
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Default Re: Front tire size vers reaction time

im in the same boat. im on a protree though. doing .05 to .07's now. need to get a little quicker.
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Old 08-01-2010, 11:04 PM   #9
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Default Re: Front tire size vers reaction time

Rember with a practice tree look for cosistant numbers not fast numbers.Bring the car to him not the other way around.You can try a lot of things before buying new tires.Most have already been said.
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Old 08-02-2010, 07:33 AM   #10
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Default Re: Front tire size vers reaction time

He stages the car pretty slowly to just light the second bulb and be in the same spot.

The car has 5 1/2 inches of travel at the front bumper. I think if I limet it more it will hurt the launch.
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Old 08-02-2010, 07:39 AM   #11
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Default Re: Front tire size vers reaction time

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how much time per week does he spend on a practice tree? If the driver isn't consistant, no sense in spending money trying to fix the car...
BINGO
I have a cable from the trans brake button under the hood that plugs into our pratice tree. It reaches our work bench in the garage so that you can put the tree out in front of the car. Only thing I cant do is hook it to his I POD.
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Old 08-02-2010, 10:15 AM   #12
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Default Re: Front tire size vers reaction time

I'm on the other end of the chain. I have the M/T 29" front tire and wish I could get a 30"

I even added front suspension travel to slow the car down more.

Had a racer years ago ask me why I would be taking air out of the front tires before a round. He'd never seen anyone ever do it. I told him I was too close to red, so was "flattening" the front tire to give me "more". We're only talking a couple pounds, but "just enough".
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Old 08-02-2010, 12:31 PM   #13
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Default Re: Front tire size vers reaction time

Quote:
Originally Posted by 69427 View Post
BINGO
I have a cable from the trans brake button under the hood that plugs into our pratice tree. It reaches our work bench in the garage so that you can put the tree out in front of the car. Only thing I cant do is hook it to his I POD.
Well since you mention iPod, Jegs has a free practice tree app for the iPhone and iPod touch. I use it a few times a day. I take 5 hits and put it away. Pretty good way to see how tight a spread you can get in a few hits.
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Old 08-02-2010, 09:08 PM   #14
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Default Re: Front tire size vers reaction time

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Originally Posted by Honk if parts fall off View Post
Well since you mention iPod, Jegs has a free practice tree app for the iPhone and iPod touch. I use it a few times a day. I take 5 hits and put it away. Pretty good way to see how tight a spread you can get in a few hits.


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Old 08-02-2010, 09:35 PM   #15
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Default Re: Front tire size vers reaction time

You got a lot of front end travel, take a couple inches out.
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