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  Mustangsandmore Forum Archive
  '64 1/2 to '68 1/2 -- The Classic Mustang
  Spring Rubber experiment

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Author Topic:   Spring Rubber experiment
SugarlandStang
Journeyman

Posts: 98
From: Sugar Land, TX
Registered: Dec 2005

posted 05-13-2006 02:46 PM     Click Here to See the Profile for SugarlandStang        Reply w/Quote
I needed to get my front springs a little stiffer (mainly because of a tire rub when I hit big bumps). So instead of using smaller tires or buying stiffer springs or shocks, I tried the old NASCAR trick of adding a spring rubber. Two of them cost me $27 incl. shipping. Though I didn't notice a stiffer ride, I did notice that the rub (bump steer effect) went away. So, mission accomplished. The spring rubber I bought was too thick to fit in my 67 spring, so I had to shave it down a little with a circular saw. What a mess! I do love the smell of burning rubber. Essentially, doing this takes 1 of 8-10 coil turns out of service. So, a 10-12% stiffer spring...?

Aussie XAXB
Gearhead

Posts: 131
From: North Olmsted, Ohio
Registered: Jan 2006

posted 05-15-2006 05:22 PM     Click Here to See the Profile for Aussie XAXB        Reply w/Quote
Essentially you made a bumper stop, eliminating where the spring can travel. This is what is keeping the tire from rubbing. Your car may still experience a "bottoming out" of the spring condition in the amount of force applied to the shock tower.

A tire rub and "bump steer" are two entirely different things. Bump steer is when your tires hit a bump and causes your wheels to change direction from where you were holding them with the wheel. It is turning of the direction of the front wheels without using the steering wheel but rather bumps in the road that cause the change.

SugarlandStang
Journeyman

Posts: 98
From: Sugar Land, TX
Registered: Dec 2005

posted 05-15-2006 08:12 PM     Click Here to See the Profile for SugarlandStang        Reply w/Quote
Yes, you are correct. Bump steer and tire rub are two different things. However, if your tire rubs when you hit a bump, it will have the same effect as bump steer. I don't think I'm bottoming out the shocks. The tires rubbed because the tires I have on it are taller and wider than stock.

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