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#1 |
Like a Rock!
Join Date: May 2002
Location: USA
Posts: 1,092
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What tire pressure do you use??????
If a tire has a 44 psi max rating, what to do you generally fill it up to?. What about a tire with 35 psi max, what do you fill that up to?.
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69 LWB Runs great - work in progress Mess with me and you mess with the whole trailer park! ![]() |
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#2 |
Registered User
Join Date: Jul 2003
Location: Cypress, Tx
Posts: 4,005
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Re: What tire pressure do you use??????
Here is an awesome informational site about this very subject. I found myself reading every word. Essetially the rule of thumb for great MPG and tire wear is max pressure minus 10%. Read this and you will be a better person for it. It truly enlightened me! http://www.carbibles.com/tyre_bible.html
Hope this helps some! Shawn
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1972 C20 Suburban- Big Blue Betty '56 Chevy Bel Air Sedan- Frame up Restoration -What would you attempt to achieve if you knew you could not fail?- -I Refuse To Tiptoe Through Life, Only To Arrive Safely At Death's Door- R.I.P. EAST SIDE LOW LIFE |
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#3 |
Senior Member
![]() Join Date: Dec 2006
Location: Studio City, Calif.
Posts: 2,873
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Re: What tire pressure do you use??????
Mine are rated for 80 psi so if I have a load of sand etc. I pressure up to 80.Then when I'm going to be empty for a while I go down to 40 or so otherwise the rears skid real easy. I didn't read the article because right from what you said about 10% less than max,I could see that it was in error.If I ran around empty with 72 psi I would wear out the middle of the tread and be skidding around like crazy since there is insufficient contact area.
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'69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme. |
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#4 |
67-72 Addict!
Join Date: Feb 2002
Location: The TAX State!
Posts: 7,857
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Re: What tire pressure do you use??????
What kind of tires require 80 psi????. They must be real heavy duty!
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Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads |
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#5 | |
Registered User
Join Date: Jul 2003
Location: Cypress, Tx
Posts: 4,005
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Re: What tire pressure do you use??????
Quote:
Shawn
__________________
1972 C20 Suburban- Big Blue Betty '56 Chevy Bel Air Sedan- Frame up Restoration -What would you attempt to achieve if you knew you could not fail?- -I Refuse To Tiptoe Through Life, Only To Arrive Safely At Death's Door- R.I.P. EAST SIDE LOW LIFE |
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#6 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: What tire pressure do you use??????
I normally check the tread temperature to determine what pressure to run, and 99% of the time, i fined an even temp across the tread right at, or close to, max pressure.
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#7 | |
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,644
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![]() Quote:
I have a couple tread depth gauges and use 'em fairly regularly. Helps to determine correct pressure by measuring uneven wear patterns. jorgensensc, thanks for the link -- I'm gonna check that out soon.
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#8 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: What tire pressure do you use??????
it wasn't cheap, just under $100. But I use it at work for a lot of things, an infared, non contact thermometer.
The cats love it too, that little red dod is a thread to there happines, so they feel they have to kill it. ![]() |
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#9 |
Senior Member
![]() Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,234
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Re: What tire pressure do you use??????
i run mine at 35 then if i load up i inflat to 45
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
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#10 |
Registered User
Join Date: Sep 2004
Location: Pierre SD
Posts: 1,533
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Re: What tire pressure do you use??????
I have been told at training schools that the spec in the door post or owner manual is what to use. The spec on the tire is the max pressure that the tire can handle while driving wide open on the autobon. Don't know if thats the truth , but is what I was told at a chrysler training class.
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I think the world needs a drink... ![]() Help somebody...If you can....VanZant We're not wrong, we're not sorry, and its probably gonna happen again. That's the truth about men. Tracy Byrd ![]() Member# 13924 '70 c10, 350/350 '68 c10 250/4spd '68 c10 no eng/trans fac ps/pb/ac/at (future father/sons project) '48 Chevy Loadmaster |
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#11 | |
Registered User
Join Date: Jul 2003
Location: Cypress, Tx
Posts: 4,005
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Re: What tire pressure do you use??????
Quote:
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1972 C20 Suburban- Big Blue Betty '56 Chevy Bel Air Sedan- Frame up Restoration -What would you attempt to achieve if you knew you could not fail?- -I Refuse To Tiptoe Through Life, Only To Arrive Safely At Death's Door- R.I.P. EAST SIDE LOW LIFE |
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#12 |
Registered User
Join Date: Sep 2004
Location: Pierre SD
Posts: 1,533
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Re: What tire pressure do you use??????
No offence. Like I said, just what i was told. I was getting more at the max pressure spec on the tire. I've never heard of lhm's method for auto tires. I do however use a similar method to adjust the rubber tracks on caterpillar rubber track tractors.
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I think the world needs a drink... ![]() Help somebody...If you can....VanZant We're not wrong, we're not sorry, and its probably gonna happen again. That's the truth about men. Tracy Byrd ![]() Member# 13924 '70 c10, 350/350 '68 c10 250/4spd '68 c10 no eng/trans fac ps/pb/ac/at (future father/sons project) '48 Chevy Loadmaster |
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#13 |
Registered User
Join Date: Sep 2007
Location: jackson MO
Posts: 143
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Re: What tire pressure do you use??????
Every situation is different. The 80 psi tires are probably 10 ply 1 ton tires. When I had 35 12.50's on a 10" rim, I had to run 20 psi in the back (not loaded of coarse) to keep it from wearing the center of the tread out. I followed the truck down the road one day with 35 psi in the tires, and you could see air on the outer 3" of tread on both sides.
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#14 | ||||
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: What tire pressure do you use??????
Quote:
Quote:
My argument normally goes like this; If your tires aren't OE, same make/model/size/on the same width rim... then that sticker is crap. An exadurated example is my truck... whie granted, there is no sticker, everyone agrees that tire technology is light years ahead of what it was back then. Well, it has increased a whole lot just in 10 years, you just don't know about it. Does anyone want to argue that a tire ment to have 80 PSI will work better at 32 PSI becouse the truck that's bolted to it? My observations have noticed, that if the tire is the right width for the rim, then max press usually ends up with good temerature across the tread, and best possible MPG. Tread wear is kept even like this too. I got this info when i was in highschool, I had to do a report (I went to tech school, so the report had to be tech related) This was worth 3/4 of our final grade, so I went all out. I was in contact with the upper level R&D guys at good year, BF-G, and Michilin. I asked them about my temperature idea, which I saw pit crews in both nascar and F-1 checking the tire temp acros the width right after the tires went over the wall after putting new ones on. They all agreed that this is the absoulte best way, hands down, no question asked. The ONLY exception to this rule, is the corvair. Quote:
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#15 |
67-72 Addict!
Join Date: Feb 2002
Location: The TAX State!
Posts: 7,857
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Re: What tire pressure do you use??????
Well I went out last night and checked the tires on my ZR2 and was suprised the max pressure stated was 65 psi. I checked them with my little tire gauge and they all read 32psi. I don't know how accurate my gauge is but that's like half of the max and way less than the 10% rule that was posted earlier. Maybe I should be running more psi?????????
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Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads |
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#16 |
Senior Member
![]() Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,234
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Re: What tire pressure do you use??????
when i worked for sam's club most passager cars we set at 35 big trucks we runabout 65 then dualies we ran the rear at 80 and the fronts at 65. i was trained by michelin and am certified as a master tire techican though them. i've seen car where people wanted us to run the pressure up to 45 when the car calls for 35 then come back to us and wants to know why there tire only lasted 20,000 miles instaead of the 80,000 it was designed for. only thing we didn;t go by the door panel was the ford explorer which called for 26 psi we set then at 35 psi
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube Last edited by truckdude239; 09-20-2007 at 07:41 AM. |
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#17 | |
Senior Member
![]() Join Date: Dec 2006
Location: Studio City, Calif.
Posts: 2,873
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Re: What tire pressure do you use??????
Quote:
__________________
'69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme. |
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