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Tire PSI & MPG's

FL335i

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Crf450r420 Enthusiast

Crf450r420

Posted
Posted

Mine show within a pound or two of what I get at the valve. I was running 44 psi in the stock tires around town and dropped them to 40 before I went on a trip. They are good to 51 or 54 psi, so no worries there. I didn't care that they wear out faster as I hate them. I now have two Michelin on the back with 34 psi and stock on the front at 40 psi. I don't know about the rough ride part as these would need to be solid rubber tires to get close to my cars ride.

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FL335i Enthusiast

FL335i

Posted
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Posted

I've been running 35psi Front and 33psi Rear, Cold. The rear is spot on the money. runs 34-35 hot while running. The fronts jump up to 37-38 hot while running. I may try 36 cold up front, but the rear is spot on. I like the combo thus far....

redwngr Senior Enthusiast

redwngr

Posted
Posted

As far as accuracy, my dash readout says 32psi cold but if I use my pressure gauge, I get 34psi.

Could also be your pressure gauge that's out. Sounds like you've got 4 opinions (tire sensors) vs one (handheld gauge).

 

I know I've had to discard pressure gauges that have lost accuracy.

stevev Enthusiast

stevev

Posted
Posted

Could also be your pressure gauge that's out. Sounds like you've got 4 opinions (tire sensors) vs one (handheld gauge).

 

I know I've had to discard pressure gauges that have lost accuracy.

 

I actually tried a different gauge and it was reading 35 psi, and the sensors still said 32/33 psi. I have nitrogen in my tires (dealer add-on that I refused to pay for and they took it off the price - along with removing some cheesy pin stripes and door edge guards)

Crf450r420 Enthusiast

Crf450r420

Posted
Posted

The air you breathe is 78% nitrogen...for tires, its more of a gimmick.

For a street car you could call it a gimmick, but it was started by racers for a real purpose. The straight nitrogen gas is without water that you will get by compressing normal air without a drier. I believe the nitrogen also expands less than the other gases, but not 100% on that one. The water in the normal air will increase in volume faster than the gas, so as the level of water changes how much your pressure will increase when the tires gets hot. Race teams want to have exactly a certain pressure to make a tires surface temps equal all the way across so they are get equal contact with the entire surface and maximum traction. They will some times give up some of the grip to get other results in handling, but they want it to be by choice and not chance. On the street you are pissing away money as you can stop and make minor adjustment getting all equal with the water in there if you really want to, but it's a waist of time. However if you have OCD you might not be able to help yourself.

sdeeter19555 Senior Enthusiast

sdeeter19555

Posted
Posted

Most of them use it because they can have a portable cylinder for rapid inflation, 2000psi regulated to whatever psi wirh zero external power...if you want dry air, add a dryer to your compressor; its cheaper.

 

Again, what you're breathing is 78% Nitrogen...that last little bit doesn't mean a whole lot to a tire.

HondaHawkGT Senior Enthusiast

HondaHawkGT

Posted
Posted

what about Nitrogen filled tires anybody tried this Norm

 

Nitrogen really only pays off with exotic cars where the tires heat up as the laps add up.The big heat swings have less effect nitrogen so tire pressures stay very stable.

ToesonTheNose Enthusiast

ToesonTheNose

Posted
Posted

My tires dont seem to hold pressure at all. I picked my truck up 25 July they had 34 psi all around. 2 days ago at start up they showed 27 PSI all around. I live in FL temps range from 80-90 so its not getting cold. I got to work and after working all day I filled them back to 34 psi and drove home. this morning started truck tires are reading 30psi all 4. wtf is going on and how am I losing this much in all 4 tires evenly. I add air at the wawa with the gauge on the pump that shuts off at 34 psi. I dont ever remember adding air to any tires in the past except every other oil change during rotation. these seem to flucuate as much as 5 psi

FL335i Enthusiast

FL335i

Posted
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Posted

Toeson- I live in Tampa. I don't have those issues. You have something going on man. My hand held dial gauge shows 35 on the front, cold and the TPMS system will show 35 when I get rolling and within a few miles I'm up to 36, 37, 38 etc. The rear I set to 33 with the same dial gauge. TPMS shows it at 32 when first driving. So maybe my gauge is less accurate at the lower range. Starting to think the TPMS system is pretty accurate. I actually tossed another dial gauge I had that was reading 2psi high. TPMS, stick gauge and my 2nd dial gauge were all on 35. My 1st dial gauge was reading 37-38. So it went. So I'm down to 1x dial gauge now that matches the 35psi, but at 33psi the TPMS shows 32. Close enough for me. 35/33 cold on the gauge is what I use. very happy with it.

j-ten-ner Senior Enthusiast

j-ten-ner

Posted
Posted

My tires dont seem to hold pressure at all. I picked my truck up 25 July they had 34 psi all around. 2 days ago at start up they showed 27 PSI all around. I live in FL temps range from 80-90 so its not getting cold. I got to work and after working all day I filled them back to 34 psi and drove home. this morning started truck tires are reading 30psi all 4. wtf is going on and how am I losing this much in all 4 tires evenly. I add air at the wawa with the gauge on the pump that shuts off at 34 psi. I dont ever remember adding air to any tires in the past except every other oil change during rotation. these seem to flucuate as much as 5 psi

On tubeless tires you're supposed to check the pressure at least every 2 weeks.

 

I bet that the temperature in the evening was warmer than in the morning.

Maybe that's the reason for the 4 psi drop.

 

so long

j-ten-ner

14 Silverado Enthusiast

14 Silverado

Posted
Posted

I have to add about 4 pounds every couple of days to all of mine. These good years really suck. Today I ordered a set of BFG all terrain in 275/65/18. Hope they work out better. Also couldn't stand not having traction with the good years on the dirt roads.

seansharley Enthusiast

seansharley

Posted
Posted

Its my experience that psi in tires fluctuates approx 10% with temps. I'm in Fla also, my tires will read 32 cold in the AM, and rise to 36 while driving. I never have to add air, but if you want a constant psi I believe nitro will help

Magoomba Enthusiast

Magoomba

Posted
Posted

For those of you who have found the ideal tire pressure, are your trucks equipped with the standard suspension package or Z71 off road? The reason I ask is that, when test driving Sierra 1500s, I found the Z71 to be too harsh of a ride for my tastes. I found it so harsh that I asked the rep to check the PSI, but all 4 tires were in the range of 35-37 PSI. We switched to a truck with standard suspension and I liked it much better. That truck had all 4 between 36-37 PSI, so valid comparison, in my opinion.

 

Since I'm going to put lots of highway miles on my Denali (should be at the dealer next week!), I'm going to set my PSI based on your recommendations, but I'm wondering which suspension packages you all have.

 

Thanks.!

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