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Old 02-23-2014, 10:59 PM   #11
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I used to teach photography.
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Old 02-23-2014, 11:32 PM   #12
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There you go. Locally I'm considered an expert in photography but dislike the term because of the proliferation of "experts" that frankly don't know a thing about the subject, no matter the subject.

Is what it is I'm afraid.
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Old 02-23-2014, 11:44 PM   #13
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Enjoy Scott's seminar!
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Old 02-24-2014, 12:22 AM   #14
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I'm just hoping I can keep up with him! I'm just now breaking through into the pro world and every step forward comes with two back.
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Old 02-24-2014, 05:37 AM   #15
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You can use my multilingual MotorhomeRV-tire-pressure-calculator, wich can be found in next map on my One-drive ( former skydrive) that belongs to my hotmail adress with same username as in this forum ( so combine yourselves if you want to contact me by mail, spamm machines cant)
https://onedrive.live.com/?cid=a526e...E092E6DC%21793

First download the american version ( tire instead of tyre) to your computer by RIGHTCLICKING and then choose Download from the dropdownbox.
Other means go wrong like leftclicking or choosing open in Web-app or Excell.
After download and eventual virus check ( you never know what those Dutch put in to it) open it in Excel programm on your computer. But Open Office CALC can handle it too.

The calculator calculates the needed pressure with my own formula wich is better then the American used formula and even better then the European one wich I once got hold of and my tire pressure story began with.
It also takes a reserve for overloading and unequall loading, and shows what is used and the reserves , but you can chanche it to your own ideas.
So if real seperate wheel weights are known , use part 3 for it . if only GAWR's are known it uses that in part 2 .
Also usefull information about loads and reserves, so you dont have to calculate that yourselfes.

It calculates same pressure R/L because car- and tire-makers advice that.
But using different R/L per axle is not that bad to my opinion.
Reasons for same pressure could be , that the mass on an axle gives same sideward forces on Right and left wheel so sideward stifnes of tire should be the same.
Mayby something in the middle would be best.

If you cant work with my calculator , give the weighs ( weighed or GAWR's) and the exact tire data ( maximum load or loadindex, Loadkind ( C to H -load) or AT-pressure ( reference-pressure, wich is not the maximum pressure) and the maximum speed of tire( mostly N speedrated is max speed of tire 140km/87m/h) )
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Old 02-24-2014, 07:31 AM   #16
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Quote:
Originally Posted by jadatis View Post
You can use my multilingual MotorhomeRV-tire-pressure-calculator, wich can be found in next map on my One-drive ( former skydrive) that belongs to my hotmail adress with same username as in this forum ( so combine yourselves if you want to contact me by mail, spamm machines cant)
https://onedrive.live.com/?cid=a526e...E092E6DC%21793

First download the american version ( tire instead of tyre) to your computer by RIGHTCLICKING and then choose Download from the dropdownbox.
Other means go wrong like leftclicking or choosing open in Web-app or Excell.
After download and eventual virus check ( you never know what those Dutch put in to it) open it in Excel programm on your computer. But Open Office CALC can handle it too.

The calculator calculates the needed pressure with my own formula wich is better then the American used formula and even better then the European one wich I once got hold of and my tire pressure story began with.
It also takes a reserve for overloading and unequall loading, and shows what is used and the reserves , but you can chanche it to your own ideas.
So if real seperate wheel weights are known , use part 3 for it . if only GAWR's are known it uses that in part 2 .
Also usefull information about loads and reserves, so you dont have to calculate that yourselfes.

It calculates same pressure R/L because car- and tire-makers advice that.
But using different R/L per axle is not that bad to my opinion.
Reasons for same pressure could be , that the mass on an axle gives same sideward forces on Right and left wheel so sideward stifnes of tire should be the same.
Mayby something in the middle would be best.

If you cant work with my calculator , give the weighs ( weighed or GAWR's) and the exact tire data ( maximum load or loadindex, Loadkind ( C to H -load) or AT-pressure ( reference-pressure, wich is not the maximum pressure) and the maximum speed of tire( mostly N speedrated is max speed of tire 140km/87m/h) )
ummm, what!
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Old 02-24-2014, 08:47 AM   #17
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On our 5er and also on the truck, I pump all tires to 65# which is what the ST tire max sidewall pressure. Truck tires are supposed to be at 85#, but only inflate them to 65#.

Individual pressures for different wts on each tire would be a PITA and IMO is beyond ridiculous.
That might be fine for ST and truck tires, its NOT fine for RV and big rig tires. Those pressures are load based, unlike most common light truck tires which only list max pressures, i.e. load range E tires.

Max pressure for the Goodyear's FR supplies is 110psi IIRC. The PROPER pressure for the FR3 is between 80-85 psi depending on how its loaded from what I remember. FR supplies load range G tires, which at max pressures will best the axle rating in front by almost 2000 pounds, and by over 4000 pounds in the rear. Running over pressure in tires like these is just as bad as being underinflated.

The real solution is a four corner weight. Axle weight (like a CAT) scale is close enough for government work. But my guess is that you'll find the magic number between 80-84 psi.

As far as the drift, is it actual drift? What were your alignment specs? Could it just be that you're not used to the type of steering box on a heavy duty chassis?
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Old 02-24-2014, 09:08 AM   #18
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I used to drive full sized dump and jetter trucks, but this has a real drift. I am getting used to it and compensating. For my wife it's a whole new experience.

I never saw the alignment numbers. The RV dealer sent it out to the company they use.

Finding scales around here is a problem. The nearest ones I have found are well over an hour from home.
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Old 02-24-2014, 09:34 AM   #19
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My FR3 30DS has the often mentioned RV Drift issue and I have had the front end aligned. At the latest RV show we went to one of the seminars and spoke with the expert (Dave Solberg - Author of "the RV handbook". We were talking about tire pressure and it's effect on steering softness. We purchased his book and it talks about having each tire at a different pressure, due to different weight on each tire.

What does the average RV user do for setting tire pressures. I always thought looking at the tire and keeping the pressure between the high and the low pressures was the answer. Apparently I am way inexperienced on this topic.
Any help would be appreciated. I did do a search of the site and found no answers.
Ask for your money back on the book.
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Old 02-24-2014, 09:43 AM   #20
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Ditto Old Coot! I run mine at max psi while towing - 5er also, since that too is so close to GVWR.
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