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Old 05-18-2014, 10:23 AM   #1
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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.
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Old 05-18-2014, 10:31 AM   #2
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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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Old 05-18-2014, 10:43 AM   #3
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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.
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Old 05-18-2014, 11:05 AM   #4
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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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Old 05-18-2014, 11:30 AM   #5
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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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Old 05-18-2014, 11:31 AM   #6
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Quote:
Originally Posted by ramblinboy View Post
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.
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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Old 05-19-2014, 10:45 AM   #7
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Quote:
IMO, the 100 PSI inflation of your new tires was purely a GUESS by the dealer,
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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Old 05-24-2014, 08:44 AM   #8
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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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Old 05-24-2014, 08:57 AM   #9
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Quote:
Originally Posted by ramblinboy View Post
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.
ramblinboy
What are the "advantages" of harder tires?
Wondering.
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Old 05-24-2014, 09:30 AM   #10
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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.
Can you actually adjust camber/caster with a solid I beam front axle?
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Old 05-24-2014, 10:02 AM   #11
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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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Old 05-24-2014, 10:14 AM   #12
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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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Old 05-24-2014, 10:22 AM   #13
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Originally Posted by Romeofrosty View Post
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.
Sounds pretty wild and bending the axle to proper specs, should be a real trick in itself.
Thanks for the info....
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Old 05-24-2014, 11:42 AM   #14
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Originally Posted by vsheetz View Post
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.
I agree
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