Wheel alignment and tyre pressures
#1
Join Date: Nov 2009
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Wheel alignment and tyre pressures
Prior to fitting 4 new tyres I noticed that one of the rear tyres was wearing badly on
the inside edge so I took it to a recommended suspension specialist.
Really pleased I did,he gave me a master class!
We had a look at the suspension underneath and he said it was very much a
Ford set up which I was not aware of to be honest and he confirmed that the
camber cannot be adjusted although after adjusting the rear toe that
improved the camber somewhat.
He found that one side was +4mm and t'other +14mm!! No wonder the tyre
was wearing badly.
He adjusted the front wheels and showed me where the adjustment was ie two
eccentric bolts on the straight and curved control arms.
I have been running the tyres at 30 psi for years but he recommend 44psi!
The tyres are good for 50 psi max and 44 will reduce tyre wear and reduce
petrol consumption.
The ride is harder but I am giving it a go.
I think I got my $100 worth!
The moral of the story: Choose carefully who you let loose on your Jag!
the inside edge so I took it to a recommended suspension specialist.
Really pleased I did,he gave me a master class!
We had a look at the suspension underneath and he said it was very much a
Ford set up which I was not aware of to be honest and he confirmed that the
camber cannot be adjusted although after adjusting the rear toe that
improved the camber somewhat.
He found that one side was +4mm and t'other +14mm!! No wonder the tyre
was wearing badly.
He adjusted the front wheels and showed me where the adjustment was ie two
eccentric bolts on the straight and curved control arms.
I have been running the tyres at 30 psi for years but he recommend 44psi!
The tyres are good for 50 psi max and 44 will reduce tyre wear and reduce
petrol consumption.
The ride is harder but I am giving it a go.
I think I got my $100 worth!
The moral of the story: Choose carefully who you let loose on your Jag!
Last edited by meirion1; 09-23-2013 at 06:05 PM.
#2
#4
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Location: Damon /Houston, Texas
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44psi is on the tyre sidewall and only recommended for "max"payload. Of which you wont ever hit unless you have some really big people in the car and fully loaded. Follow reyes post. Better ride and normal wear. Now if youre gonna leave the car parked for any length of time then air to 60psi so the tyres don't flat spot
#5
If you ran with 44psi in the UK, and had an accident, and your insurance company found out you could find they'd refuse to meet your claim as you had significantly departed from manufacturer's recommended pressures.
I don't know insurance companies are like in Aus, but here these days they will latch onto any reason they can find to refuse a claim.
In fact, even if you didn't have an accident but the Police stopped you for some reason, and tested the pressure of your tyres, you could end up with points on your license.
I don't know insurance companies are like in Aus, but here these days they will latch onto any reason they can find to refuse a claim.
In fact, even if you didn't have an accident but the Police stopped you for some reason, and tested the pressure of your tyres, you could end up with points on your license.
Last edited by Partick the Cat; 09-24-2013 at 09:29 AM.
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#6
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#7
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#8
I am with you on the pressure. Are you running Michelins? My first set of Pilot Sports wore out on the outside edges in 10k miles using the Jag recommended pressures. I, like you, noticed the max pressure is rated at 50 psi, so I tried running 45 psi on my second set. They run great and I am passing 20 k miles with no uneven treadware. The downside, as you noticed, is the stiffer ride.
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meirion1 (09-28-2013)
#10
Oh my, he must hate Jaguar? Jaguar is actually doing the best they can in fuel mileage and tire wear.
Most of my driving is under 50 mph on country roads and I average about 40 mpg on Cooper's Zeon RS3-A on all 4 Paws. Oh, and I keep my 4 paws inflated to 32 psi.
#12
#13
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Looks like there are shims on the rear.
Loads of info here and expert info from Brutal too!
https://www.jaguarforums.com/forum/x...-camber-48316/
Loads of info here and expert info from Brutal too!
https://www.jaguarforums.com/forum/x...-camber-48316/
#14
At 50psi, you'd need to keep an eye on suspension components like bushes and rear wheel bearings. You may soon need to replace them because of the accelerated wear induced by higher than "normal" tyre pressure.
I kept my tyre pressure between 34 and 35psi for a long while to avoid rim damage caused by the many potholes on our roads. It didn't take long before I had to replace the rear bearings. The control arms also started leaking or became wobbly. I'm not suggesting that the bearings or control arms could have been affected by the tyre pressure, but it was too much of a coincidence that these problems emerged after maintaining tyre pressure at that level for about a year.
Perhaps if your roads are smoother than ours, 50psi isn't such a bad idea, but even still, you may as well get closer to recommended tyre pressure levels.
The best thing to do to keep tyre costs down, would be to check your wheel alignment settings every 6200miles or when you hit a serious bump or after driving on untarred road surfaces. It could save you lots of cash on tyres.
I kept my tyre pressure between 34 and 35psi for a long while to avoid rim damage caused by the many potholes on our roads. It didn't take long before I had to replace the rear bearings. The control arms also started leaking or became wobbly. I'm not suggesting that the bearings or control arms could have been affected by the tyre pressure, but it was too much of a coincidence that these problems emerged after maintaining tyre pressure at that level for about a year.
Perhaps if your roads are smoother than ours, 50psi isn't such a bad idea, but even still, you may as well get closer to recommended tyre pressure levels.
The best thing to do to keep tyre costs down, would be to check your wheel alignment settings every 6200miles or when you hit a serious bump or after driving on untarred road surfaces. It could save you lots of cash on tyres.
#15
At 50psi, you'd need to keep an eye on suspension components like bushes and rear wheel bearings. You may soon need to replace them because of the accelerated wear induced by higher than "normal" tyre pressure.
I kept my tyre pressure between 34 and 35psi for a long while to avoid rim damage caused by the many potholes on our roads. It didn't take long before I had to replace the rear bearings. The control arms also started leaking or became wobbly. I'm not suggesting that the bearings or control arms could have been affected by the tyre pressure, but it was too much of a coincidence that these problems emerged after maintaining tyre pressure at that level for about a year.
Perhaps if your roads are smoother than ours, 50psi isn't such a bad idea, but even still, you may as well get closer to recommended tyre pressure levels.
The best thing to do to keep tyre costs down, would be to check your wheel alignment settings every 6200miles or when you hit a serious bump or after driving on untarred road surfaces. It could save you lots of cash on tyres.
I kept my tyre pressure between 34 and 35psi for a long while to avoid rim damage caused by the many potholes on our roads. It didn't take long before I had to replace the rear bearings. The control arms also started leaking or became wobbly. I'm not suggesting that the bearings or control arms could have been affected by the tyre pressure, but it was too much of a coincidence that these problems emerged after maintaining tyre pressure at that level for about a year.
Perhaps if your roads are smoother than ours, 50psi isn't such a bad idea, but even still, you may as well get closer to recommended tyre pressure levels.
The best thing to do to keep tyre costs down, would be to check your wheel alignment settings every 6200miles or when you hit a serious bump or after driving on untarred road surfaces. It could save you lots of cash on tyres.
I am surprised to learn that accelerated wear of rear bearings already took place at 34-35 psi (50 psi I would understand). Are you sure that was the cause?
35 psi is not an uncommon recommendation for X350 tyres pressure, even more when driving under load and at speed.
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