"Driving an Expedition with extremely over-inflated tires at 100mph is NOT what I consider a slight risk."
42 psi in 44 maximum pressure is over-inflated? 100 mph for short distances does not increase the pressure much. After delivery I took pressures on both front tires. 43 psi. (Digital readout pressure tester.)
What does ‘maximum pressure 44 psi’ mean?
Why is Ford’s Expedition’s governed speed 105 mph?
Why do some police departments install “chips” which allow higher speeds on their Expeditions?
(One Ford dealer said they refused to do it.)
When the vehicle calls for 35psi…YES IT IS OVER INFLATED.
What does 'maximum pressure 44 psi' mean?
It does NOT say Maximum pressure of 44psi…instead it says Maximum pressure of 44psi @ (some weight). I suggest you go back to your tire and re-read it.
That weight is very important. You don’t just read the MAX pressure. Plus when you drive at 100mph…tire gets hotter and increases the tire pressure more.
Why is Ford's Expedition's governed speed 105 mph?
My 69 bug had a speedometer that would go to 90mph…that vehicle was unsafe at 70.
@MikeInNH, we’ve explained all this to Robert before, that the sidewall rating is the maximum for the tire, but not for a particular vehicle application, but the amount recommended by the car manufacturer is the one you should use with that vehicle. He thinks he knows better than the team of engineers that designed his vehicle, so you’re wasting your time trying to talk sense into him.
For anyone out there thinking of following Robert Gift’s bad advice and bad example, The sidewall number is the maximum pressure, and the figures in the owner’s manual and on the door jam are the recommended pressure. Tire manufacturers only put the maximum pressure on the sidewall so you don’t buy a tire with a maximum rating of 35 PSI for a truck that uses 40 PSI tires. In other words, if Ford calls for 35 PSI in the tires on your Expedition, you want to make sure you buy tires with a maximum pressure rating of 35 PSI or more. Inflating your tires to the maximum rating on the tire sidewall can often lead to unintended consequences like premature tire wear, premature wear of expensive suspension components, and avoidable accidents. So far, Robert has been lucky, but that luck will run out some day.
Maximum 44 psi @ max load of 2600 lbs - I recall.
Weight is <1,500/tire. Unknown front vs rear weights. Placcard 35 psi
Am over pressure for the weight. Tire company says 42psi is “perfect”.
Speedometer goes to 120 but governed at 105 mph I discovered.
Robert, you said early in the thread that you were doing 120 mph on T-rated tire inflated to 42psi. I replied that what you were doing was extremely dangerous. That’s how this whole thing started.
I still maintain that you’re combining three extremely dangerous behaviors:
(1) extreme speed
(2) exceeding the maximum speed rating of your tires
(3) driving on tires inflated to essentially their maximum pressure ratings.
The ratings on the tires represent the very edge of catastrophic failure. You’re pushing the envelope on both critical ratings.
The speed speaks for itself. It completely eliminates any margin for error, and pushes the operating envelopes of the vehicle and of its tires.
You may not like hearing it, but what you’re doing is crazy. I hope you reconsider.
That means you should be inflating your tires to 44 IF your vehicle weighs 10,400lbs. Your vehicle weighs half that.
Real example…Back in the 80’s I owned a GMC S-15. I put a larger set of tires (without doing a lift) on the truck when the OEM tires wore out. I put on 31x10.5. My brother-in-law owned a Full Size Ford F-150…He had the same tires and size (31x10.5). So according to YOU…as long as we don’t go above MAX we’re fine! If we both run at 42psi…it’s fine??? The F-150 weighed about double what my S-15 weighed.
Am over pressure for the weight. Tire company says 42psi is "perfect".
Who said that?? I know the manufacturer never said that…no way no how. The place you bought the tires from??? If so…find another tire shop…they have no idea what they’re talking about.
^ Discount Tire manager.
He agrees that the tire should flex less at higher speeds.
He is also from Germany and says they keep at maximum for their autobauns.
He also agrees with my suspicion that car manufacturers make softer for a better ride.
7 lbs over 35 placcard is too much?
What do you recommend?
Of course any person with any fear of recourse would recommend using the tire pressures recommended by the manufacturer. Why? Because you would potentially be opening up yourself to liability clams. More tire failures occur from under inflation than over inflation, but following the mfgr recommendation is the only advice that is reasonable. Sure the psi is based on a tradeoff of ride, tire wear and mileage maximization, but at the end of the day say deal with 1 or 2 mpg loss and go with vehicle mfgr recomendation.
"There is no restriction for emergency vehicles for emergency vehicles on emergency runs. "
There is nothing written in state ordinances excusing you from going faster then the speed limit routinely when not in life saving situations which you are engaged in all of the time. You are an unqualified volunteer making routine deliveries, no more no less. Next, you are going to tell me with a light bar you can make arrests and carry a gun.
Has what rights…speed in an emergency situation ? You still pull them over. If it’s legit, you transfer occupants into the cruiser. You don’t allow civilians to speed 25 mph over the speed limit. You do not have the right to carry a concealed weapon in most states nor do you have the right to carry a gun and make choices only police can at your discretion. His isn’t Dodge City in the 1880s. You have the right to apply for a permit to carry a concealed weapon as prescribed in most states and under their restrictions. Your blanket statements can get you in big trouble. You want to make a citizens arrest and deny some one their civil rights ? You had better be damn careful because you are not protected from liability suits like a police officer is when they detain some one for a variety of reasons. You are conflating situations.