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  #11  
Old 12-14-2010, 08:31 PM
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Discount Tire has all sorts of strange ideas regarding tire inflation and lug nut torque which seem to go against Toyota recommendations. I say stick with what Toyota specs. 100 series tire pressure is weighted towards the rear of the truck - front 29 psi and rear 32 for regular loads and 32 front and 35 rear for towing according to the owner manual.
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Old 12-14-2010, 08:43 PM
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Quote:
Originally Posted by Crash View Post
Discount Tire has all sorts of strange ideas regarding tire inflation and lug nut torque.
I'll check that too. At least I did watch the guy us a torque wrench. Receipt says 115.
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  #13  
Old 12-14-2010, 09:02 PM
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Originally Posted by Inukshuk View Post
I'll check that too. At least I did watch the guy us a torque wrench. Receipt says 115.
Does your truck have steel wheels?
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  #14  
Old 12-15-2010, 06:13 AM
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Quote:
Originally Posted by Crash View Post
Does your truck have steel wheels?
No. 115 too much, aye? I have no idea how tight they really are.
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  #15  
Old 12-15-2010, 07:11 AM
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Aluminum rims should be around 76(I think I have always torqued to 80 ftlb). 115 is for the steel rim.
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Old 12-15-2010, 08:14 AM
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Every Subaru I've ever dealt with has a different front/rear pressure rating on the OEM door jab decal. They have one of the most sensitive AWD systems when it comes to mismatched tires. What's kind of odd is that our 05 Outback calls for 32 front and only 30 rear. You would think loaded the back would be heavier.

Anyway I would not hesitate putting more pressure in the rear when loaded. I do in my 80 and used to in my 40 too.
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Old 12-15-2010, 08:41 AM
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Quote:
Originally Posted by powderpig View Post
Aluminum rims should be around 76(I think I have always torqued to 80 ftlb). 115 is for the steel rim.
Will check.

What about the inflation difference for P metric vs. LT. Nitto says:

"Please note that size-for-size, LT-metric tires require higher air pressures to carry equivalent loads of P-metric tires, and that any failure to adjust air pressures to achieve the vehicles load requirement will result in tire fatigue and eventual tire failure due to excessive heat build-up. Due to the higher PSI requirements of LT-metric tires, they may not be suitable for replacing O.E. P-metric tires because of the ride harshness that results from higher PSI requirements.
P265/75R16 114 Max Load = 2,601 lbs @ 35 PSI. In order to carry the equivalent load, a LT265/75R16 Load Range C must be inflated to 50 PSI. Using this
example, even LT265/75R16 Load Range D, or E must be inflated to 50 PSI to carry the P-metric load at
35 PSI. LT tires do not offer any benefits of being "heavy duty" when under-inflated."

http://www.nittotire.com/assets/safe...t%20Trucks.pdf
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  #18  
Old 12-15-2010, 09:08 AM
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I can see difference of tire diameter mattering in a mini with a fully geared, non-differentiating t-case.

But with the 80, it shouldn't matter. The minimal tire diameter difference between the front and rear tires due to tire pressure would cause insignificant speed difference front to rear compared to the difference in speeds front to rear in a sharp turn or u turn on pavement. The center diff can compensate for an entire axle not moving, hence the need for a center diff lock.
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  #19  
Old 12-15-2010, 10:37 AM
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So what you are saying is that I can't convert my 80 into a funny car? Dang!

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  #20  
Old 12-15-2010, 11:24 AM
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Quote:
Originally Posted by DaveInDenver View Post
We couldn't keep our 4Runner long enough for me to figure out much about it, though I assumed that a Torsen type limited slip center diff like Toyota uses can obviously deal with it. What I don't know is if constant compensating will harm it long term. It seems like asking it to always be torque sensing would be just like running uneven diameter tires on an axle locking diff. These things are designed to intermittently decouple/lock on pavement, not be held in a state of constant partial decouple. Your point is totally valid, that if it couldn't then Toyota would say use the same inflation on all 4 tires, which they apparently do not.
If the center diff is like the locking axle diffs, then running constantly at different speeds won't hurt it. But, if its like you say, and it is a torsen style, then yeah, I imagine long term it could hurt it. However, I still maintain that the difference in tire diamether in the pressure differences we are talking about, is so small as to be fine even in the torsen style. Yes, if you were running 33's up front, and 35's out back, then yeah, but if you are running a 35 and a 35.2, due to pressure difference, no problems will crop up.
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