| [GMCnet] caster settings [message #138104] |
Mon, 08 August 2011 19:12  |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma:
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Senior Member |
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I am not sure we can be off enough to make it worth the time to measure...
I did a brief survey of the GMCnet, and seems like most don't care.... or
worry about difference in caster;>)
here are some of the comments:
--------------------------
When taken to alignment shop the camber has been within 1-2* sometimes
closer. The caster has always been more on the drivers side??
Usually
2 1/2 on Pass side and
3 1/2 on drivers side.
--
C. Boyd
On Double Trouble which was a Transmode manufactured in November of 1974
the
most caster Tom Hampton could get with offset bushings was 1.9 degrees on
both sides. After John Sharpe and I installed Dave Lenzi's offset upper
control arms the alignment shop got 5 degrees. Double Trouble drives like
it's on rails!
Even caster is not difficult to determine. The digital level can be
zero'd at one 20* turn angle and then read at the opposite 20*
position. That reading multiplied by 1.4 should give the caster.
And, as you suggested, since we're really only interested in getting
as much as possible, that value isn't really important -- what we
really want is to the get the caster close to the same on both sides.
Considering that most of our driving is usually on nearly-flat
highways, I'm not even very concerned about setting a road-crown bias.kenh
,
I believe that is just a starting point. The key is to max out caster
while still maintaining zero camber. You may have some adjustment left in
the rearmost adjuster but zero camber is the limiting factor.stevef
All the cams appear to be at about the same position front and back.
Certainly not
what I would have expected. The printout from their machine is not handy
but I
think it was as close to 0,0 as expected and caster was 3.0 and 3.4 .
I think there is room for more caster... what say yea? bruceh
Besides, on the GMC, I'm not sure it even makes sense to waste time
measuring caster -- I've never heard of anyone with too much. :-)
Ken H.
Usually my attitude toward things isn't very popular, but my belief is that
if the toe
& caster is right & the caster is sufficient that the vehicle drives well,
is within
specs & don't wear out tires, it ain't broke
daveB
Last time I spoke to Dave he noted that he was of the opinion that current
generation radial tires like to run flat on the road hence his
recommendation of a 0° camber setting.
I know Dave is constantly changing the settings he runs to see how they
affect the handling of the GMC. Dave's recommends 5° Caster, 0° Camber, and
0 Toe in/out when you install a pair of his offset upper control arms.
I have never heard or read of anyone with concentric or offset upper control
arm bushing ever getting anywhere near 5° caster. So if 5° caster was the
number that was proclaimed we’d have heaps of people saying there was NO
WAY the alignment shop could get that much caster. By saying as much caster
as
you can get it solves that problem.
Here's the settings on Double Trouble AFTER John Sharpe and I installed a
set of Dave's offset upper control arms.
Left:
Camber: 0.1 degrees
Caster: 5.2 degrees
Toe: 0.0 inches
Front Axle 1
Right
Camber: -0.2 degrees
Caster: 4.8 degrees
Toe: 0.0 inches
rob
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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