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Old 05-17-2018, 09:08 AM   #1
Eric Merryfield
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Default Re: Front tire pressure adjustments

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Originally Posted by Kdw1403 View Post
Thanks Ryan. I think you are correct. I’ll check into hooking up that switch.
You have some good suggestions here.

Just to complete the logic circle, you do have a brake pressure gauge in the car and know what brake pressure you are staging at correct? Don't have time to look, etc, get a go pro and video the gauge. If your not consistent with that then there you go.

Two step, could help, depends on your carb and how it works when floored, you may also want to upgrade to a brake pressure switch, instead of the brake pedal piece.

Log books should give you a clue too. Time trials versus competition etc.

Change one thing at a time.

Eric
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Old 05-17-2018, 09:30 AM   #2
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Default Re: Front tire pressure adjustments

What’s the best source for a brake pressure switch? I’ve also avoided a button on the brake petal, just another thing to put in the starting line procedure.
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Old 05-17-2018, 11:16 AM   #3
tony wood
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Default Re: Front tire pressure adjustments

ok this is gonna sound stupid but try ankle weights used them on my stick super stocker was going 10-15 red try 5pd weight
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Old 05-17-2018, 02:44 PM   #4
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Default Re: Front tire pressure adjustments

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ok this is gonna sound stupid but try ankle weights used them on my stick super stocker was going 10-15 red try 5pd weight
I think that would be taken as loose ballast (illegal).You would need a MD's cert.calling it some form of prosthetic...lol
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Old 05-18-2018, 05:00 PM   #5
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Default Re: Front tire pressure adjustments

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I think that would be taken as loose ballast (illegal).You would need a MD's cert.calling it some form of prosthetic...lol
would it be any different if it was 5lbs of lead in a shoe?
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Old 05-18-2018, 06:03 PM   #6
Jim Caughlin
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Default Re: Front tire pressure adjustments

I would think there is grounds to consider that the whole front tire pressure affecting RT's might be somewhat of an urban legend. As a test, I put my car on a flat floor in the shop and put a 3" block in front and behind the front tire at the 40PSI that I normally run and measured the distance between the blocks. I then started lowering the pressure in increments and remeasured the distance. I got all the way down to 15 PSI (which I thought was probably an unsafe pressure to actually race at) and the distance between the block had barely changed. Maybe the 3" height wasn't quite right but it has to be pretty close to the correct height for the photocell. Based on that, I kind of wonder if the real life change in RT is in the drivers head and not a result of the rollout. If you doubt my test, try it yourself.

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Old 05-18-2018, 06:08 PM   #7
Dave Muller
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Default Re: Front tire pressure adjustments

Someone has a detailed mathematical analysis of this online that reached the same conclusion. I think you need to focus on other parameters rather than tire pressure.
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Old 05-19-2018, 10:32 AM   #8
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Default Re: Front tire pressure adjustments

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I think that would be taken as loose ballast (illegal).You would need a MD's cert.calling it some form of prosthetic...lol
Was told to do this many many years ago by Tony Cowell.
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Old 05-19-2018, 11:16 AM   #9
Ed Wright
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Default Re: Front tire pressure adjustments

Wish I could remember who, but a fast stick shift guy once showed me weights he bolted to his clutch pedal.
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Old 05-18-2018, 04:55 PM   #10
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Default Re: Front tire pressure adjustments

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Originally Posted by tony wood View Post
ok this is gonna sound stupid but try ankle weights used them on my stick super stocker was going 10-15 red try 5pd weight

damn! never thought of that!


I gotta try it
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