[xj40] Does higher speed cause that much more stress on my XJ40?

XJ40
21

In reply to a message from Muleears sent Tue 3 Jan 2006:

I just put tires on my 88 VDP, and when I asked one tire shop for a
guesstemate price, I gave him the reccommended # in the glove
compartment. He stated the V in the tire # was a speed rating and
highly recommended the 700 doller tires for safety and handling
purposes, (205/70 VR15) of coarse I bought the cheapo~s @347
dollors. He also stated the non rated tires were only good to 113
MPH, anything over that would be risky??? Dont know for sure but
it is worth a thougt.
Dan
west bend WI.
88 VDP 137,000 jade tope
74 Stingray Candyapple RED 127,000
68 Sporty slightly custom
90 Olds Supreme, rusty blue
4 snowblowers, and 3 10 speeds haha
KEEP CRUZIN IN STYLE BOYS AND GIRLS!!!–
dan peterson
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22

May be but mine will float along at 100 mph on cruise for hours. No
problem plenty of room let to get up to 5400 rpm
I run it not much like in the winter but on long 3-5 hour runs on the
interstate with 75 mph limits and traffic that cruise at 90 mph mostly.
We have tremendous wind here in the midwest, Blow you off the road if
you have a van. Hardly notice the wind in the XJ40 even at 100 mph.
Very stable car with good air flow. The only difference noted against a
head wind will be a reduction in gas mileage
Jay 90 Majestic

Brian Caro wrote:

In reply to a message from Muleears sent Tue 3 Jan 2006:

A big difference between 70 and 90 is the wind resistance. As this
pressure increases with the square of the velocity, there is much
greater resistance at 90 than at 70 which the drivetrain has to
overcome. A car that is not used at high outputs that suddenly has
to perform can have issues, such as injectors that are partially
plugged but work okay around town, but if pushed, will cause a lean
condition at higher throttle that will burn the valves (fairly
common). This goes for marginal radiators that cannot keep the
engine, power steering and tranny cool at high speeds, hoses that
cannot take the increased flow from the water pump at contiunued
high rpm, globs of abrasive carbon residue on intake valves that
let go at high rpm and get into the cylinder at speed, and so on.
If one wants to plow ahaead at speed, build up to it slowly and
keep an eye on things.

Brian Caro 96XJ6 4.0 63E-TypeS1FHC
Newport News, VA, United States
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23

In reply to a message from dan peterson sent Fri 6 Jan 2006:

I just put a set of Sumitomo HTR+ V rated tires on my car for $80
each including shipping from Tire Rack and mounting. If you shop
around, you can get top rated stuff for cheap. The Jag should
always have V rated or better on it, some tire shops will not even
install lower rated tires due to liability.–
Brian Caro 96XJ6 4.0 63E-TypeS1FHC
Newport News, VA, United States
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24

In reply to a message from Brian Caro sent Sat 7 Jan 2006:

a marketing ripoff, IMHO I think we’ve discussed this issue
before some time ago in the archives … the ‘‘V’’ rating is a speed
rating, not a weight rating … it is not necessary for safety that
our cats use a V rated tire, so long as you don’t drive them over
100 mph routinely …–
The original message included these comments:

around, you can get top rated stuff for cheap. The Jag should
always have V rated or better on it, some tire shops will not even
install lower rated tires due to liability.

–
&:-)) Paul '88 XJ6 VDP 130k & '88 XJ6 VDP 180k
Garland, Texas, United States
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25

Totally true. However most newer cars that don’t run speed rated tires now have computer based speed govenors to keep the speed below 103MPH. Cars that come equipped with V-rated tires from the factory rarely do. Some shops then won’t install less than V-rated tires on a car specifying V-rated tires because either they really think they might get sued if you go out and have a tire explode at 125MPH or they just want to sell you a more expensive tire.

Besides the obvious ability for higher speed driving V-rated tires often will offer better handling characteristics. Typically though they also wear out faster.

From: “AttyDallas” attydallas2@aol.com
Date: 2006/01/10 Tue AM 11:35:56 EST
To: xj40@jag-lovers.org
Subject: Re: [xj40] Does higher speed cause that much more stress on my XJ40?

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26

In reply to a message from dboarder@sympatico.ca sent Tue 10 Jan 2006:

I replaced mine at Discount Tire. They don’t even carry a V-rated
tire in this size in regular stock. It’s a special order only.
BUT, they have in stock and as a standard replacement, H-rated
tires. No questions or concerns at all in putting on H-rated tires
for my car. I asked about V-rated, and the tire guy told me not to
bother, unless I did a good bit of high speed cornering, because
it’s the sidewalls that are beefed up for the most part.–
WCManess - 1991 XJ40/6 - Black/Grey - 4.0 liter
Arlington/Texas, United States
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27

Hypothetical question here.
You buy an XJ40 from a dealer.
It has H rated (or lower) tyres fitted by the PO on the basis of ecomony.
You , as a driver don’t poodle about at 50mph but drive the car to its
maximum (but within legal limits).
You have an accident due to a blow out and your Ins Company refuse to pay
out as the tyres were incorrect for the vehicle.
I am sorry but the recommended tyres for any car ( any manufacturer) is not
quoted for fun but will have a factual basis.
We are talking here about a 2ton car (missile) that will exceed the speed
limit of probably any country in the world with ease .
Don’t forget, the rubber at each corner is the only thing between you and
the hard stuff.
Would you fit cheap brake pads/discs on the basis that you don’t drive fast
??
Would you fit the cheapest springs /dampers for the same reason ?

If the answer is yes, then I am sorry, you own the wrong car !

Phil (Tin Hat on)

Find us at
http://www.xjjaguar.co.uk/
Call (+44) 01323 740471 ( 0900-1800 GMT ONLY)

From: “wcmaness” wes@maness.cc
To: xj40@jag-lovers.org
Subject: Re: Re: [xj40] Does higher speed cause that much more stress on my
XJ40?
Date: Tue, 10 Jan 2006 22:29:48 +0100

In reply to a message from dboarder@sympatico.ca sent Tue 10 Jan 2006:

I replaced mine at Discount Tire. They don’t even carry a V-rated
tire in this size in regular stock. It’s a special order only.
BUT, they have in stock and as a standard replacement, H-rated
tires. No questions or concerns at all in putting on H-rated tires
for my car. I asked about V-rated, and the tire guy told me not to
bother, unless I did a good bit of high speed cornering, because
it’s the sidewalls that are beefed up for the most part.

WCManess - 1991 XJ40/6 - Black/Grey - 4.0 liter
Arlington/Texas, United States
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28

If someone lives in Canada where I live and obeys the speed limits he will
never ever be in a situation of having an H rated tire failure.
The V-rating of a tire is a speed rating, it has nothing to do with the
weight of the car. There are lot of vehicles out there much heavier than a
Jaguar that are doing just fine on H rated tires.

   I like V-rated tires on mine but I also see retired couples who

bought their car for comfort and elegance not for speed. To me putting
V-rated tires on a car thats going to the grocery store and church is quite
a waste.

On some North American cars it used to be possible to order them with or
without V rated tires. If you order them with H rated tires a speed govenor
was programmed into the CPU. Not sure if they still do that…----- Original Message -----
From: “Phil Parrington” pp221158@hotmail.com
To: wes@maness.cc; xj40@jag-lovers.org
Sent: Tuesday, January 10, 2006 6:12 PM
Subject: Re: Re: [xj40] Does higher speed cause that much more stress on my
XJ40?

Hypothetical question here.
You buy an XJ40 from a dealer.
It has H rated (or lower) tyres fitted by the PO on the basis of ecomony.
You , as a driver don’t poodle about at 50mph but drive the car to its
maximum (but within legal limits).
You have an accident due to a blow out and your Ins Company refuse to pay
out as the tyres were incorrect for the vehicle.
I am sorry but the recommended tyres for any car ( any manufacturer) is
not quoted for fun but will have a factual basis.
We are talking here about a 2ton car (missile) that will exceed the speed
limit of probably any country in the world with ease .
Don’t forget, the rubber at each corner is the only thing between you and
the hard stuff.
Would you fit cheap brake pads/discs on the basis that you don’t drive
fast ??
Would you fit the cheapest springs /dampers for the same reason ?

If the answer is yes, then I am sorry, you own the wrong car !

Phil (Tin Hat on)

Find us at
http://www.xjjaguar.co.uk/
Call (+44) 01323 740471 ( 0900-1800 GMT ONLY)

From: “wcmaness” wes@maness.cc
To: xj40@jag-lovers.org
Subject: Re: Re: [xj40] Does higher speed cause that much more stress on
my XJ40?
Date: Tue, 10 Jan 2006 22:29:48 +0100

In reply to a message from @David_Boarder sent Tue 10 Jan 2006:

I replaced mine at Discount Tire. They don’t even carry a V-rated
tire in this size in regular stock. It’s a special order only.
BUT, they have in stock and as a standard replacement, H-rated
tires. No questions or concerns at all in putting on H-rated tires
for my car. I asked about V-rated, and the tire guy told me not to
bother, unless I did a good bit of high speed cornering, because
it’s the sidewalls that are beefed up for the most part.

WCManess - 1991 XJ40/6 - Black/Grey - 4.0 liter
Arlington/Texas, United States
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services and resources including Photo Albums, Event Diary / Calendar, On
Line Books and more !

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services and resources including Photo Albums, Event Diary / Calendar, On
Line Books and more !

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29

In reply to a message from Phil Parrington sent Wed 11 Jan 2006:

Utilization of H rated, instead of Z rated tires would not be a
valid legal reason to deny an insurance claim. The ratings are
based on optimal performance at the maximum end - not normal safety
operation levels. Such safety issues fall under an entirely
different set of federal regulations for motor vehicle safety
requirements. Otherwise - all cars would be required to have Z
rated tires - because it’s safer in case you decide to speed -
right?–
WCManess - 1991 XJ40/6 - Black/Grey - 4.0 liter
Arlington/Texas, United States
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30

Dave

The faster the tire rolls the more friction heat builds up inside it.
Heat is the enemy of tires. If the tire is designed to take the heat
generated by sustained driving at 130 mph its a better tire than one
rated to take the heat generated at 100 mph. Whether you drive those
speeds or not it irrelevant. You get a better more stable tire when you
use a W rated tire than when you use a V rated tire and so on.

The higher speed rated tire will also get better wear than the lower
speed rated tire if one can presume the same tread design, tire size and
durometer rating of the rubber. Wear is more a function of softness of
the rubber. Softer rubber grips the road better and gives better
handling but wont wear as well regardless of speed rating.

Some tires like the Pirelli P5 used a very soft durometer rubber go give
good handling but the softer rubber wore faster. The P4000 Super
Touring is W rated and I am not sure if it had the same durometer as the
P5 had but I suspect the rubber is a bit harder as I get much better
wear on the P4000 ST than I did with the P5 that came with the car.On thing to remember the Jag suspension was really designed around the Michelin and Pirelli tires and using other brands may not give the absolute best handling you will get with the P4000ST which is W rated. As for using H and S rated tires. I put a pair of Firestone S rated tires on my SIII and they blew belts like nothing. I couldn’t drive a week without blowing a belt. Went back to P5 and handled like a dream with no broken belt problems. Wouldn’t give me more than 25000 miles though due to the softer rubber. Jay dboarder@sympatico.ca wrote:

Totally true. However most newer cars that don’t run speed rated tires now have computer based speed govenors to keep the speed below 103MPH. Cars that come equipped with V-rated tires from the factory rarely do. Some shops then won’t install less than V-rated tires on a car specifying V-rated tires because either they really think they might get sued if you go out and have a tire explode at 125MPH or they just want to sell you a more expensive tire.

Besides the obvious ability for higher speed driving V-rated tires often will offer better handling characteristics. Typically though they also wear out faster.

From: “AttyDallas” attydallas2@aol.com
Date: 2006/01/10 Tue AM 11:35:56 EST
To: xj40@jag-lovers.org
Subject: Re: [xj40] Does higher speed cause that much more stress on my XJ40?

Visit the Jag Lovers homepage at http://www.jag-lovers.org for exciting services and resources including Photo Albums, Event Diary / Calendar, On Line Books and more !

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31

Obviously, regulations will vary across the world. I for one would not like
to test a UK Ins Co resolve on such an issue.
The bottom line is however, the XJ40 is an expensive car to run, doing it
on the cheap is one of the reasons we manage to keep plenty of stock :-))
You would be amazed at how many cars come to us with bald tyres and
countless ‘warnings’ on the dash .
Most are easily fixed but the owner ignores the little individual problems
that a 15yr old car can develope and suddenly there are dozens of problems
which appear major.
We even get asked for used brake components , hoses, pads etc !

‘I only paid peanuts for the car so I only want to pay peanuts for parts’

A common cry by owners.

Phil

Find us at
http://www.xjjaguar.co.uk/
Call (+44) 01323 740471 ( 0900-1800 GMT ONLY)

From: “wcmaness” wes@maness.cc
To: xj40@jag-lovers.org
Subject: Re: Re: [xj40] Does higher speed cause that much more stress on my
XJ40?
Date: Wed, 11 Jan 2006 01:02:28 +0100

In reply to a message from Phil Parrington sent Wed 11 Jan 2006:

Utilization of H rated, instead of Z rated tires would not be a
valid legal reason to deny an insurance claim. The ratings are
based on optimal performance at the maximum end - not normal safety
operation levels. Such safety issues fall under an entirely
different set of federal regulations for motor vehicle safety
requirements. Otherwise - all cars would be required to have Z
rated tires - because it’s safer in case you decide to speed -
right?

WCManess - 1991 XJ40/6 - Black/Grey - 4.0 liter
Arlington/Texas, United States
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services and resources including Photo Albums, Event Diary / Calendar, On
Line Books and more !

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32

Phil

They have an entirely (sorry about the pun) different philosophy in the
US to us here in the UK. Nobody seems to care about speed rating only cost.
I think my car was sold new with Z rated tyres and that is what is
recommended in the handbook. The special construction “Z” rated “J”
Pirellis that Jaguar uses must have been designed to give the best
performance and ride. These have now been replaced by “W” rated Pirelli
P6000s.
Reading this list it is also obvious that they don’t often drive above
about 70mph whereas I know that here the cars are often driven at
130mph. when conditions allow even tho’ it is illegal.

Norman watkins
'94 XJ6 4.0S

Phil Parrington wrote:

Hypothetical question here.
You buy an XJ40 from a dealer.
It has H rated (or lower) tyres fitted by the PO on the basis of ecomony.
You , as a driver don’t poodle about at 50mph but drive the car to its
maximum (but within legal limits).
You have an accident due to a blow out and your Ins Company refuse to
pay out as the tyres were incorrect for the vehicle.
I am sorry but the recommended tyres for any car ( any manufacturer)
is not quoted for fun but will have a factual basis.
We are talking here about a 2ton car (missile) that will exceed the
speed limit of probably any country in the world with ease .
Don’t forget, the rubber at each corner is the only thing between you
and the hard stuff.
Would you fit cheap brake pads/discs on the basis that you don’t drive
fast ??
Would you fit the cheapest springs /dampers for the same reason ?

Visit the Jag Lovers homepage at http://www.jag-lovers.org for exciting services and resources including Photo Albums, Event Diary / Calendar, On Line Books and more !

33

Exactly. The tire/car combinations was designed for sustainned speeds of
130mph. However in North America the speed limits are typically 70MPH or
less. (Ranging from 55 to 70 in most of Canada and U.S). To drivers who
intend to stay within the limit the V-rating seems to be overkill especially
when they see the price difference. I would suspect that we also tend to
drive a lot more annual miles. Even though I only drive the Jaguar in the
summer a set of tires will only last me about 2 seasons of moderate driving.
95% of my driving is to and from work where I am driving on paved country
roads with a limit of 60-80kms/hr (40-50mph).

If I wanted to install the spec’d tire on my car Pirelli 225/65VR15 I was
quoted at price of $400 each and they would be special order (this is not
from a dealer but a chain tire store). Thats a lot of money especially for
tires that I don’t even like much. They seemed to do terrible in the rain. I
ended up settling for a Yokohama P215/65VR15 tires which is priced in at
about $174 each(note they are still a V-rated tire) Note that most tire
shops when they use their computer to determine tire requirements come up
with a 205/70-15 tire size for my car.

Most of the cars in North America are running on less than V-rated tires.
Most of those cars are likely capable of speeds above 100MPH (many modern
cars are CPU speed limited for liability reasons).

Most of the safety concerns reguarding tire failure seems to be with
inflation. Studies have shown that many cars are 25% or more under inflated.
Its considered such an issue that tire pressure monitoring systems are being
mandated for new vehicles.----- Original Message -----
From: “Norman Watkins” norman@norman-watkins.fsnet.co.uk
To: xj40@jag-lovers.org
Sent: Wednesday, January 11, 2006 6:59 AM
Subject: Re: [xj40] Does higher speed cause that much more stress on my
XJ40?

Phil

They have an entirely (sorry about the pun) different philosophy in the US
to us here in the UK. Nobody seems to care about speed rating only cost.
I think my car was sold new with Z rated tyres and that is what is
recommended in the handbook. The special construction “Z” rated “J”
Pirellis that Jaguar uses must have been designed to give the best
performance and ride. These have now been replaced by “W” rated Pirelli
P6000s.
Reading this list it is also obvious that they don’t often drive above
about 70mph whereas I know that here the cars are often driven at 130mph.
when conditions allow even tho’ it is illegal.

Norman watkins
'94 XJ6 4.0S

Phil Parrington wrote:

Hypothetical question here.
You buy an XJ40 from a dealer.
It has H rated (or lower) tyres fitted by the PO on the basis of ecomony.
You , as a driver don’t poodle about at 50mph but drive the car to its
maximum (but within legal limits).
You have an accident due to a blow out and your Ins Company refuse to pay
out as the tyres were incorrect for the vehicle.
I am sorry but the recommended tyres for any car ( any manufacturer) is
not quoted for fun but will have a factual basis.
We are talking here about a 2ton car (missile) that will exceed the speed
limit of probably any country in the world with ease .
Don’t forget, the rubber at each corner is the only thing between you and
the hard stuff.
Would you fit cheap brake pads/discs on the basis that you don’t drive
fast ??
Would you fit the cheapest springs /dampers for the same reason ?

Visit the Jag Lovers homepage at http://www.jag-lovers.org for exciting
services and resources including Photo Albums, Event Diary / Calendar, On
Line Books and more !

Visit the Jag Lovers homepage at http://www.jag-lovers.org for exciting services and resources including Photo Albums, Event Diary / Calendar, On Line Books and more !

34

Dave

Cars here that are limiteed are limiteed to 155 mph!

NW

Dave wrote:

Most of the cars in North America are running on less than V-rated
tires. Most of those cars are likely capable of speeds above 100MPH
(many modern cars are CPU speed limited for liability reasons).

Visit the Jag Lovers homepage at http://www.jag-lovers.org for exciting services and resources including Photo Albums, Event Diary / Calendar, On Line Books and more !

35

I have to say, I don’t understand the big debate of using S versus V or Z
rated tires. The cost difference in general is a drop in the bucket compared
to the peace of mind the higher end tires provide with better quality
construction. The performance advantages of a high end, high speed rated
tire are everything we are looking for , for our special cars. These are not
Hondas or Chevys.

I am one who feels if you are looking to cheap out on the quality tire you
place on your car, the Jaguar is not the right car for you. A set of very
very good tires runs what, maybe $500, versus a set of mediocre tires at
$350? What in the world would anyone be thinking to cheat a little, and go S
rated just to save a measly two or three tanks of gas.

Seems silly to me, there should be no debate. Its Z rated for me all the
way. The performance and handling alone are worth the extra expense.

Daniel
1994 XJ12
1995 XJS 4.0----- Original Message -----
From: “Norman Watkins” norman@norman-watkins.fsnet.co.uk
To: xj40@jag-lovers.org
Sent: Wednesday, January 11, 2006 8:57 AM
Subject: Re: [xj40] Does higher speed cause that much more stress on my
XJ40?

Dave

Cars here that are limiteed are limiteed to 155 mph!

NW

Dave wrote:

Most of the cars in North America are running on less than V-rated
tires. Most of those cars are likely capable of speeds above 100MPH
(many modern cars are CPU speed limited for liability reasons).

Visit the Jag Lovers homepage at http://www.jag-lovers.org for exciting
services and resources including Photo Albums, Event Diary / Calendar, On
Line Books and more !

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36

Daniel
Hear Hear !

Phil

Find us at
http://www.xjjaguar.co.uk/
Call (+44) 01323 740471 ( 0900-1800 GMT ONLY)

From: “Daniel Arsenault” arsenaultd@earthlink.net
Reply-To: “Daniel Arsenault” arsenaultd@earthlink.net
To: xj40@jag-lovers.org
Subject: Re: [xj40] Does higher speed cause that much more stress on my
XJ40?
Date: Wed, 11 Jan 2006 09:09:55 -0800

I have to say, I don’t understand the big debate of using S versus V or Z
rated tires. The cost difference in general is a drop in the bucket
compared
to the peace of mind the higher end tires provide with better quality
construction. The performance advantages of a high end, high speed rated
tire are everything we are looking for , for our special cars. These are
not
Hondas or Chevys.

I am one who feels if you are looking to cheap out on the quality tire you
place on your car, the Jaguar is not the right car for you. A set of very
very good tires runs what, maybe $500, versus a set of mediocre tires at
$350? What in the world would anyone be thinking to cheat a little, and go
S
rated just to save a measly two or three tanks of gas.

Seems silly to me, there should be no debate. Its Z rated for me all the
way. The performance and handling alone are worth the extra expense.

Daniel
1994 XJ12
1995 XJS 4.0

----- Original Message -----
From: “Norman Watkins” norman@norman-watkins.fsnet.co.uk
To: xj40@jag-lovers.org
Sent: Wednesday, January 11, 2006 8:57 AM
Subject: Re: [xj40] Does higher speed cause that much more stress on my
XJ40?

Dave

Cars here that are limiteed are limiteed to 155 mph!

NW

Dave wrote:

Most of the cars in North America are running on less than V-rated
tires. Most of those cars are likely capable of speeds above 100MPH
(many modern cars are CPU speed limited for liability reasons).

Visit the Jag Lovers homepage at http://www.jag-lovers.org for exciting
services and resources including Photo Albums, Event Diary / Calendar, On
Line Books and more !

Visit the Jag Lovers homepage at http://www.jag-lovers.org for exciting
services and resources including Photo Albums, Event Diary / Calendar, On
Line Books and more !

Visit the Jag Lovers homepage at http://www.jag-lovers.org for exciting services and resources including Photo Albums, Event Diary / Calendar, On Line Books and more !

37

In reply to a message from Daniel Arsenault sent Wed 11 Jan 2006:

I think that confuses the real issue. The speed rating isn’t a
quality issue. The speed rating boils down to sidewall thickness
(for the most part) - not quality of tire construction. You can
spend $350.00 on a cheap set of Z rated tires, that aren’t nearly
the quality of a well made H- rated tire.–
WCManess - 1991 XJ40/6 - Black/Grey - 4.0 liter
Arlington/Texas, United States
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38

Limited by what? The CPU or the Ocean?
Does that mean all your cars that can do more than 100MPH must have V-rated tires?

From: Norman Watkins norman@norman-watkins.fsnet.co.uk
Date: 2006/01/11 Wed AM 11:57:10 EST
To: xj40@jag-lovers.org
Subject: Re: [xj40] Does higher speed cause that much more stress on my XJ40?

Dave

Cars here that are limiteed are limiteed to 155 mph!

NW

Dave wrote:

Most of the cars in North America are running on less than V-rated
tires. Most of those cars are likely capable of speeds above 100MPH
(many modern cars are CPU speed limited for liability reasons).

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39

Its hardly a drop in the bucket. It depends a lot on where you live and how much you drive.

I was quoted by a Canadian Tire chain.

The spec’d tire Pirelli 225/65-VR15 $400each = $1600.00 (special order)
What I have on my car Yokohama 215/65-VR15 $178 each = $712.00
Just an estimate but I am sure a good none V-rated tire would be less than $100 = $400.00

Now my Jaguar is in storage during the winter months but with the V-rated tires they only last about 2 seasons. During the winter months I run a Ford Taurus.

If I wanted to use the “correct” tire for my car the difference versus a good H rated tire is $1200 over a 2 year period. I compromised and used different V-rated tire. That cost difference is probably significant more for someone using the H rated tires because in my experience they tend to have a longer life.

My point is that I am not going to get all hot and bothered if someone decides that a good H-rated tire will serve their needs when their needs are dictated by a 55-70mph speed limit which they intend to adhere to. Not all people who buy these cars are looking to push them to their limits. Often they are looking for a comfortable ride with some elegance. The reality of the situation is that often because of their low value these cars are often bought by people who especially rich. After all thats one reason this list exists.

I am sure someone in the US will point out how the tires can be bought much cheaper off some place like tirerack.com. However by the time I include the exchange rate, shipping, duty, taxes and installation the pricing is not that far off.

From: “Daniel Arsenault” arsenaultd@earthlink.net
Date: 2006/01/11 Wed PM 12:09:55 EST
To: xj40@jag-lovers.org
Subject: Re: [xj40] Does higher speed cause that much more stress on my XJ40?

I have to say, I don’t understand the big debate of using S versus V or Z
rated tires. The cost difference in general is a drop in the bucket compared
to the peace of mind the higher end tires provide with better quality
construction. The performance advantages of a high end, high speed rated
tire are everything we are looking for , for our special cars. These are not
Hondas or Chevys.

I am one who feels if you are looking to cheap out on the quality tire you
place on your car, the Jaguar is not the right car for you. A set of very
very good tires runs what, maybe $500, versus a set of mediocre tires at
$350? What in the world would anyone be thinking to cheat a little, and go S
rated just to save a measly two or three tanks of gas.

Seems silly to me, there should be no debate. Its Z rated for me all the
way. The performance and handling alone are worth the extra expense.

Daniel
1994 XJ12
1995 XJS 4.0

----- Original Message -----
From: “Norman Watkins” norman@norman-watkins.fsnet.co.uk
To: xj40@jag-lovers.org
Sent: Wednesday, January 11, 2006 8:57 AM
Subject: Re: [xj40] Does higher speed cause that much more stress on my
XJ40?

Dave

Cars here that are limiteed are limiteed to 155 mph!

NW

Dave wrote:

Most of the cars in North America are running on less than V-rated
tires. Most of those cars are likely capable of speeds above 100MPH
(many modern cars are CPU speed limited for liability reasons).

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services and resources including Photo Albums, Event Diary / Calendar, On
Line Books and more !

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40

Thats true although its not likely that you can get a “cheap” V-rated tire as it has to be designed to not come apart at 130MPH. Certainly that means it has to seriously reduce sidewall flex and thus heat generated. It also has to be well balanced etc. That implies certain level of quality control

I certainly think its possible to buy a perforance non V-rated tire which will provide compariable handling to a low end V-rated tire(assuming you keep to the speed rating). Of course the price might not be that much different either.

From: “wcmaness” wes@maness.cc
Date: 2006/01/11 Wed PM 12:57:45 EST
To: xj40@jag-lovers.org
Subject: Re: [xj40] Does higher speed cause that much more stress on my XJ40?

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