XJ40 ( XJ81 ) 1986 - 1994

New shoes: 225/55 RZ16

 
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Old 02-27-2017, 08:34 PM
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Default New shoes: 225/55 ZR16

I 225/56ZR16
Well, Im moving along with making my car a nice canyon carver, so I mounted a nice set of BFGs on the car. Next is brake fluid flush, and rear suspension. The car has basically transformed with tyres alone. It commands the road again, feels planted, compared to the old P4000s of course. The most interesting part is that theres zero road noise. Its so smooth I can only hear my clunky suspension when it clunks but thats it. Soon, it will be ready for the canyon network that I often have to drive
 

Last edited by Brewtech; 02-27-2017 at 08:38 PM.
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Old 02-27-2017, 09:37 PM
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How does the GPS compare with the speedo reading now you're running smaller tires?
 
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Old 02-27-2017, 10:11 PM
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I'll do test run tonight, and post my findings
 
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Old 02-27-2017, 10:41 PM
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Okay did a street run an noticed a 2-3 mph discrepancy. Ill run more tests tomorrow on the fwy. Here are some pics using a pretty reliable app that Ive used to keep my speed in check while traveling.

One thing that stands out is that my needle is not exactly at zero when at a complete halt. So I wonder if the discrepancy is only off by 3 or less miles. Doesn't matter it'll keep me in either the speed limit or less.
 

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Old 02-28-2017, 08:42 AM
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Originally Posted by Brewtech View Post
Here are some pics using a pretty reliable app that Ive used to keep my speed in check while traveling.
That's a cool-looking app. What is it? I'd like to check it out.

My GPS and the Waze app on my phone also indicate actual speed vs. speed limit, but not in numbers that large on the display. The Torque Pro app indicates vehicle speed in cars with OBDII ports (no such luck on our OBDI XJ40s).

I do have a concern that the GPS and app designers are compiling secret databases of all the times we (unintentionally) exceed the speed limit so the information can be used against us, such as in the event of an accident, or to sell the information to insurance companies and consequently increase our premiums, or to simply blackmail us at some point in the future. One of the great things about driving cars from the '90s is that they are not connected to the cloud, but carrying our phones with us makes us nearly as vulnerable to spying as if we were driving modern connected cars.

Cheers,

Don
 
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Old 02-28-2017, 09:52 AM
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Hey Don! Its called speedometer and its free. You can also place it on your dash and it reflect your speed on to the windshield just like a Heads UP Display. So it displays the info backwards on your phone so that it displays correctly on your windshield. Its the information age so everything and anything can and will be used against us. I'll try not to speed just to be safe out there, even though just about every car out there now has more power than before
 
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Old 02-28-2017, 12:07 PM
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Old 03-01-2017, 05:58 PM
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It is a lovely looking car - I like the colour especially. What colour is it? And a Vanden Plas; I always get a twinge of spec-envy with the VDP and Daimler - mine's only the Sovereign! Those chrome plated Aero alloys must be very rare. I like that design - we didn't get it in the UK, our Daimler had version of the Aero without the exposed nuts.

The tread patten reminds me quite strongly of the Michelin Crossclimate tyres I have on my car. Your tyres look very similar. The Crossclimates are also really quiet and grip the road MUCH better than the old Pirelli P4000s I used to have on the car as well.

I switched to the 8J 16" forged Lattice alloys from 15" Teardrops since the tyres were older than I was happy with - and the 225/65 15 99W size isn't available any more. I went with the 225/60 16 size since I value ride comfort above absolute handling and haven't regretted it. These preferences in a car are personal of course - there is no right answer and Jaguar fitted 225/55 16 tyres to the same wheels on the XJ12 and also on the XJR in he UK - and the 225/60 16 tyres on the less sporting variants.

I find the car handles better with the new tyres feeling significantly more planted, is much quieter - indeed virtually no road noise at all at lower speeds on reasonable road surfaces, and after playing with the tyre pressures, also rides better too. The improved ride really surprises me, since the wheels have gained an inch in diameter and an inch in width. It demonstrated how far tyre technology has progressed.

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You can see the similar tread pattern here:

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Old 03-02-2017, 10:17 AM
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Originally Posted by db in uk View Post
It is a lovely looking car - I like the colour especially. What colour is it? And a Vanden Plas; I always get a twinge of spec-envy with the VDP and Daimler - mine's only the Sovereign! Those chrome plated Aero alloys must be very rare. I like that design - we didn't get it in the UK, our Daimler had version of the Aero without the exposed nuts.

The tread patten reminds me quite strongly of the Michelin Crossclimate tyres I have on my car. Your tyres look very similar. The Crossclimates are also really quiet and grip the road MUCH better than the old Pirelli P4000s I used to have on the car as well.

I switched to the 8J 16" forged Lattice alloys from 15" Teardrops since the tyres were older than I was happy with - and the 225/65 15 99W size isn't available any more. I went with the 225/60 16 size since I value ride comfort above absolute handling and haven't regretted it. These preferences in a car are personal of course - there is no right answer and Jaguar fitted 225/55 16 tyres to the same wheels on the XJ12 and also on the XJR in he UK - and the 225/60 16 tyres on the less sporting variants.

I find the car handles better with the new tyres feeling significantly more planted, is much quieter - indeed virtually no road noise at all at lower speeds on reasonable road surfaces, and after playing with the tyre pressures, also rides better too. The improved ride really surprises me, since the wheels have gained an inch in diameter and an inch in width. It demonstrated how far tyre technology has progressed.



You can see the similar tread pattern here:

Stunning car! I do like those wheels a lot! As for my Aeros I have looked for a trace of chrome plating but I can't. I do wonder if they're plated or polished since I can tell when aluminum start to have a bit of haze if not kept up, and these are have a light haze abou them. It is my understanding that Michelin and BFG are practically the same company under the same ownership
 
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Old 03-02-2017, 02:12 PM
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Originally Posted by Brewtech View Post
It is my understanding that Michelin and BFG are practically the same company under the same ownership

BFG acquired Uniroyal in 1986, and Michelin acquired BFG in 1988.
 
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Old 06-09-2017, 05:20 PM
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For DB in UK. I have a 1989 Daimler and am facing the problem of replacing the tires. Have concluded that I should change the rims -- currently metric 390 Teardrops. Were there any particular problems fitting the 16" rims on your vehicle -- which is in much better shape than mine!. If not, it would give me more options for finding replacements.
Thanks
 
 

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