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Re: [Fot] LSD

To: "MadMarx" <tr4racing@googlemail.com>, <fot@autox.team.net>
Subject: Re: [Fot] LSD
From: "Charly Mitchel" <charly@mitchelplumbing.com>
Date: Fri, 1 Jun 2012 07:35:34 -0700
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You say this happened when you went from a welded diff to a LSD. Could this be caused by the way the torque is delivered to the wheels? On a welded diff, the wheels get exactly the same amount of torque with no split between the sides. With a LSD, there is the possibility that one wheel may get more torque than the other. At this point I think that all the items mentioned before also come into play. I would believe the only way to remedy this would be to put on the torque rods (traction bars) to positively locate the rear axel, and keep from having spring wind up. Make sure you make the mounting fairly stout, as I witnessed a TR4 have one break several weeks ago.
and BTW, torque steer is fairly common in TR6's.

Charly Mitchel


Marks comment did lead me to an theory:

If the force of the prop shaft makes that the rear axle press the left wheel
on the ground and pulls the right wheel slightly up this would cause the
axle to steer because the leaf springs are higher mounted at the rear than
in front.
If the right wheel goes up and the left goes down the rear axle would change
direction to the left.....which make the car going to the right "on
throttle" - opposite "off throttle"

As I change axle ratio from 4.1 to 4.55 the engine force is greatly
increased which might result in more steer from the axle.
Could this be?
If so, then torque rods are now mandatory.

Chris

-----Urspr|ngliche Nachricht-----
Von: fot-bounces@autox.team.net [mailto:fot-bounces@autox.team.net] Im
Auftrag von Mark J Bradakis
Gesendet: Freitag, 1. Juni 2012 04:27
An: fot@autox.team.net
Betreff: Re: [Fot] LSD

There is also the reaction of the axle housing against the propshaft.
The shaft turns one way, the axle reacts in the opposite direction.
One wheel is pushed a bit harder into the rollers, one lifted a bit
up.

mjb.
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