| [GMCnet] Over steer [message #303791] |
Mon, 18 July 2016 19:07  |
glwgmc
Messages: 1014
Registered: June 2004
Karma:
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Senior Member |
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Hi Kieth,
Oversteer is not a common malady with our coaches. Check to see that all six wheels are running frame parallel. If they are, then you want 1 to 2 degrees of tire in at the top camber on the rear wheels to keep the back end in place during a turn. If you have tire out at the top camber, then the only way to get those 1 to 2 degrees is to shim the boggie mount or by twisting the boggie arm if only one is tire out at the top and the other is tire in at the top. That can happen by hitting a curb and it usually is found on the middle passenger side. The proper front spec for radial ply tires on our coaches is zero toe (tires frame parallel), zero camber (tire straight up and down) and as much caster as you can get (up to 5 degrees) so long as both sides are equal. Usually you will only be able to get around three or maybe four degrees. The factory spec of 2 degrees static was for bias ply tires and is too little static caster for radials which behave differently under speed. If you have stock single bag rear suspension there will be some wallow, but not excessive. If you have bag risers there will be a bit more wallow but still not excessive in normal driving. Check also the condition of the front sway bar bushings. If they are really loose or missing then the whole coach will feel loose in a corner.
Jerry
Jerry Work
The Dovetail Joint
Fine furniture designed and hand crafted in the 1907 former Masonic Temple building in historic Kerby, OR
glwork@mac.com
http://jerrywork.com
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Message: 12
Date: Mon, 18 Jul 2016 14:51:15 -0500
From: Keith V
To: "gmclist@list.gmcnet.org"
Subject: [GMCnet] Over steer
Message-ID:
Content-Type: text/plain; charset="iso-8859-1"
So I am extremely picky about steering and suspension, too much time pretending to be a race car driver I guess.
My coach drives straight as an arrow, very nice and predictable.
That is until you go into a turn, like a cloverleaf, then it feels like the rear wants to come around on me. I feel like it should be better.
I've checked the ride height, it's within spec.
I've checked the front and rear alignment, also within spec.
Checked the bogie play, and it seems to be within spec, but spec seemed pretty loose to me
Shocks are good.
So for those of you that can feel such things, are these machines naturally loose?
Or do I have some rear suspension work to do?
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Jerry & Sharon Work
78 Royale
Kerby, OR
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