Champagne

95 lbs/ft of torque

Paul

1slo928

Gee was my Mecanic wrong when he said tighten it till it strips and then back off a 1/4 turn? I am still trying to buy that can of compression any one have a spare? couldn't resist.

Chris

danglerb

You have no idea how much that gives me the urge to replace all my lug nuts with new ones.

UKKid35

I check lug nut torque almost as often as I check tyre pressures

danglerb

Me too, thats what worries me.

Running around checking DOT codes I checked the pressure on my other car and didn't find a single tire with more than 22 psi.

Jim bailey - 928 International

Tire pressure is so important yet so neglected..."When tire care is factored in, the rising fuel prices become even scarier.

"Running a tire 20 percent underinflated – only 5 to 7 pounds per square inch – can increase fuel consumption by 10 percent. That can easily cost motorists two or three miles per gallon. Not only that, but the tire’s tread life is reduced by 15 percent," said John Peer, director of retail operations for The Goodyear Tire & Rubber Company.

If that’s not enough, the Society of Automotive Engineers reports that 87 percent of all flat tires have a history of underinflation.

The Energy Department has reported that every pound per square inch of tire underinflation wastes 4 million gallons of gas daily in the U.S. At today’s prices and with more vehicles on the road, that’s a huge expense. An underinflated tire deflects more energy and increases rolling resistance, which robs the vehicle of fuel efficiency.

The escalating gasoline prices mirror the severity of tire underinflation. In the 1970s, the National Highway Traffic Safety Administration claimed that half the nation’s cars had underinflated tires. Other studies stated that 25 to 28 percent had at least one tire "seriously" under inflated. " The basic FACT is ALL tires leak ...

SteveG

I got a used van. For maintenance, first thing I do on any vehicle is re-torque nuts and add anti-seize. Didn't use impact wrench (maybe that would have prevented the prob) I twisted off two lugs. Maybe the impact wouldn't have mattered, b/c at least one other was cross threaded, so I'm thinking the shop just turned up the air, fast and dirty and they are on there permantly. Dealing with those kinds of shops is touchy.

the flyin' scotsman

Jim..........given the above are accurate statements (Goodyear and SAE) why is it so difficult for tyre manufacturers to recommend pressures for their given brands for a vehicle that did not have their tyres factory installed.

The 928 is a classic example where todays tyres far exceed what was available when our cars were new but try to find pressure specs other than what we banter about here or what Porsche recommended 20 years ago.

Too open for law suits down your way i guess.

Bill Ball

Even the 218 lb-ft for the crank bolt feels low when you use a torque wrench. Previously I would guestimate the 218 with my breaker bar. Also, I guestimated that most crank bolts where set at 300-400 lb-ft, based on the huge effort required to break them free. Now, after getting a 300 lb-ft torque wrench and finding out what 218 lb-ft is really like, I'd say most bolts I've dealt with were over 500 lb-ft and I was probably putting them back on at 300. On the last TB/WP job, a couple of gentle pulls on the torque wrench, and I was at 218, whereas I nearly broke my 5-ft breaker bar getting the bolt off beforehand. Nicole can testify to that.

Jim bailey - 928 International

Bill I think it is the same rattle gun problem that we have with lug nuts and some "Techs" use air tools to be sure that crank bolt is tight ! We often get calls for front pulley washer and bolt because they spun loose on the highway...sometimes because the washer was upside down but I believe more often because they never used a torque wrench the first time.

SteveG

As with the use of a torque wrench, there is a technique for the anti-seize. Someone correct me if wrong: It should not get onto the shoulder of the nut as that would affect the torque/friction. A small amount on the threads only is the proper use.

Dennis Wilson

Food for thought. When I did the tech inspections for the 928OC DE at Hallet a couple years ago, 25% if the vehicles (928's, 944's and 911's) had lugnuts torqued less than 95 ftlbs. I feel that most of these errors were from using an uncalibrated clicker type torque wrench. Two other observations. 1.) The only driver that asked me what I was doing was a 911 entry (guess he thought he didn't need inspected even though he had undertorqued lugnuts) and 2.) 23 vehicles X 4 wheels X 5 lugnuts X 95 ft lbs made this old fart a tired inspector.

Dennis

1slo928

you know tire presure was a big contributing factor in fords explorer mess with Firestone tires if you ever come across one look at the door sticker that tells the recomended tire pressure you will discover that Ford wanted you to practicaly run them loer than anyoter vehicle I have ever seen I amagen it was due to there high center of gravity and the investigations of roll overs in Suzuki Samaris at the time of the explorer introduction aroun 1990.

just a interesting tid bit from my wealth of useless information

Chris

dr bob

My 1992 Explorer came off the dealer lot new with 19 in front and 22 in the rear. Drove t home, put in the 26 PSI recommended on the door sticker. Rode like an ice wagon, so back to the dealer. they rediuced the tire pressure again to get the harshness out of the ride. I compromised at about 22 on the front and 25 on the rears. 75k miles on teh Firestones before I just couldn't keep them round anymore. Tons of towing and hauling, hot desert pulls with the boat trailer in the 125+ summer. It's amazing the tires didn't fail catastrophically, especially when you hear the horror stories about rollovers and such. Eventually, Ford replaced the tires with Michelins, upped the pressure recommendation from 26 to 28, and that made us all safer I guess.

danglerb

Tire pressure does make a WHALE of a difference in ride quality. I had to drive farther than I liked after checking my tires and finding them at 20 to 22 psi, so I figured them as "hot" and put in 35 psi intending to drop it down to the whatever its supposed to be later when cold. The road feel increased, with cobblestones giving the car a lot of harshness.

Dealers are notorious for lowering tire pressure. I finally told my Lincoln dealer to never touch my tire pressures again.