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05-18-2014, 09:23 AM
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#1
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Senior Member
Fleetwood Owners Club Workhorse Chassis Owner
Join Date: Mar 2013
Posts: 466
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Steering like a madman
Got my 6 new Toyos and an alignment in Helena MT. Dealer put 100lbs in all tires. I need to adjust constantly it goes left, right and rarely in between.
My rig calls for 95 front and 90 rear. My question is would reducing the front air pressure help it steer better bby squatting a bit more on the blacktop or live with the advantages of harder tires?
This is a Workhorse chassis.
__________________
2008 Fleetwood Southwind
W22 Workhorse Chassis 8.1L Chev Vortec
Allison 1000 transmission
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05-18-2014, 09:31 AM
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#2
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Senior Member
Gulf Streamers Club
Join Date: Jan 2012
Location: Cincinnati
Posts: 19,925
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The only way to determine tire pressure is to have the RV weighed. Once you know your axle weights, look up proper inflation here:
Load & Inflation Tables | Toyo Tires
I wouldn't just reduce pressure randomly, use the proper recommendations.
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Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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05-18-2014, 09:43 AM
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#3
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Senior Member
Fleetwood Owners Club Workhorse Chassis Owner
Join Date: Mar 2013
Posts: 466
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Thanks for the recommendation. I guess vague steering is a feature of the 06 and beyond in the Workhorse chassis. My alignment could have been adjusted to account for this as I understand.
__________________
2008 Fleetwood Southwind
W22 Workhorse Chassis 8.1L Chev Vortec
Allison 1000 transmission
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05-18-2014, 10:05 AM
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#4
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Senior Member
Join Date: Jun 2011
Posts: 287
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I have a 2008 Workhorse 38 ft MH you may want to look into a rear track bar to stop the tail wag. I have Steer Safe on my MH and am looking at getting rear track bar installed.
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Mody n Domy
full timing it
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05-18-2014, 10:30 AM
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#5
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Senior Member
Fleetwood Owners Club Ford Super Duty Owner
Join Date: Jun 2012
Location: SoCal
Posts: 15,749
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If it was driving straight before the new tires and alignment, I would be very suspect of the alignment or one of the new steer tires. Tire pressure 5-10 or so pounds one way or the other should not make a huge difference.
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Vince and Susan
2011 Tiffin Phaeton 40QTH (Cummins ISC/Freightliner)
Flat towing a modified 2005 Jeep (Rubicon Wrangler)
Previously a 2002 Fleetwood Pace Arrow 37A and a 1995 Safari Trek 2830.
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05-18-2014, 10:31 AM
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#6
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Senior Member
Join Date: Oct 2002
Location: Madison, MS
Posts: 10,527
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Quote:
Originally Posted by ramblinboy
Thanks for the recommendation. I guess vague steering is a feature of the 06 and beyond in the Workhorse chassis. My alignment could have been adjusted to account for this as I understand.
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NOPE. IMO, the 100 PSI inflation of your new tires was purely a GUESS by the dealer, and likely THAT is the cause of your issue. Was it wandering on the old tires at the lower pressure?
As suggested, get actual weight and adjust according to TOYO's pressure tables for the weight you are carrying.
There is a caster adjustment via adding wedges to the axle that others here claim has made a big difference for them in reducing steering wander. Search the Workhorse forum to read about increasing the caster angle. Apparently only a few degrees makes a big difference.
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05-19-2014, 09:45 AM
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#7
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Moderator Emeritus
Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 27,704
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Quote:
IMO, the 100 PSI inflation of your new tires was purely a GUESS by the dealer,
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It was a guess, and a poor one, since the factory recommended pressure is 95 front and 90 rear. Those pressures are always worst case (maximum axle load), so there is no reason to inflate higher yet. Odds are the front axle can be reduced, but that cannot be done without getting an actual scaled weight first. However, I would start by putting the tires at the factory setting rather than 100 all around.
Alignment could be a contributor too. The tolerances on Workhorse alignment are fairly broad and the shop may have end up at one extreme whereas you were previously at the other. A big change is toe-in could give your symptoms.
I've seen other RV owners report that their new Toyos took some time, maybe 1000 miles, to "wear in" and track better.
Question: are the Toyos the same size and load range as the tires they replaced? If not, the required pressure could be different than the factory sticker recommends.
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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05-24-2014, 07:44 AM
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#8
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Senior Member
Join Date: Nov 2013
Location: Calgary AB
Posts: 160
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Lower the air preasure my 22.5's I run 80 in the front and 75 rear. I still added handling fixes but air pressure was the one rcomended here and seemed to work and helped a lot with steering.
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05-24-2014, 07:57 AM
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#9
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Registered User
Join Date: Mar 2010
Posts: 8,777
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Quote:
Originally Posted by ramblinboy
Got my 6 new Toyos and an alignment in Helena MT. Dealer put 100lbs in all tires. I need to adjust constantly it goes left, right and rarely in between.
My rig calls for 95 front and 90 rear. My question is would reducing the front air pressure help it steer better by squatting a bit more on the blacktop or live with the advantages of harder tires?
This is a Workhorse chassis.
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ramblinboy
What are the "advantages" of harder tires?
Wondering.
Mel
'96 Safari
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05-24-2014, 08:30 AM
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#10
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Senior Member
American Coach Owners Club
Join Date: Jul 2007
Location: SW Florida
Posts: 2,971
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Quote:
edgray
There is a caster adjustment via adding wedges to the axle that others here claim has made a big difference for them in reducing steering wander. Search the Workhorse forum to read about increasing the caster angle. Apparently only a few degrees makes a big difference.
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Can you actually adjust camber/caster with a solid I beam front axle?
__________________
07 Revolution LE 40E_1 1/2 Baths_Spartan MM Chassis_06 400HP C9 CAT_ Allison 3000
Dinghy_2010 Jeep Wrangler JKU ISLANDER
1998 36ft. National Tropi-Cal Chevy Model 6350 (SOLD)
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05-24-2014, 09:02 AM
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#11
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Junior Member
Join Date: Mar 2014
Posts: 10
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Caster on a solid axle is adjusted by installing tapered wedges in between the front spring and the axle this tilts the axle either forwards or backwards, depending on the desired effect. Camber on a solid axle can usually only be adjusted by bending the axle.
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05-24-2014, 09:14 AM
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#12
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Junior Member
Monaco Owners Club
Join Date: Jul 2012
Location: NW Oregon
Posts: 16
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For what it's worth, after I had six new tires installed it took about 300 miles for them to "break in" and settle down. I adjusted the tire pressures according to my rig's weight after I left the tire shop because as someone already pointed out they were aired-up according to the sidewall by the install folks.
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2002 Monaco Diplomat 38PBD
Being chased by a 2006 PT Cruiser
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05-24-2014, 09:22 AM
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#13
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Senior Member
American Coach Owners Club
Join Date: Jul 2007
Location: SW Florida
Posts: 2,971
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Quote:
Originally Posted by Romeofrosty
Caster on a solid axle is adjusted by installing tapered wedges in between the front spring and the axle this tilts the axle either forwards or backwards, depending on the desired effect. Camber on a solid axle can usually only be adjusted by bending the axle.
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Sounds pretty wild and bending the axle to proper specs, should be a real trick in itself.
Thanks for the info....
__________________
07 Revolution LE 40E_1 1/2 Baths_Spartan MM Chassis_06 400HP C9 CAT_ Allison 3000
Dinghy_2010 Jeep Wrangler JKU ISLANDER
1998 36ft. National Tropi-Cal Chevy Model 6350 (SOLD)
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05-24-2014, 10:42 AM
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#14
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Senior Member
Join Date: Feb 2012
Location: Aiken,SC
Posts: 1,025
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Quote:
Originally Posted by vsheetz
If it was driving straight before the new tires and alignment, I would be very suspect of the alignment or one of the new steer tires. Tire pressure 5-10 or so pounds one way or the other should not make a huge difference.
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I agree
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Good Sam Life Members
Served in U.S.A.F.
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