What I mean is does driving 85-90 MPH cause a great deal more
stress on my car than driving 70 MPH? I recently had a heater hose
blow while on the interstate after travelling for 3 hrs. at 85+.
Does it stress the tranny more? Engine? Cooling system? I know
higher speed and RPM will cause more heat, vibration etc. But is
the difference between 70 and 90 significant? My car has been
reasonably well maintained but she is approaching 170K miles, am I
pushing my luck with higher hiway speeds? I will average a 1K mile
trip once a month. Balance of the driving is everyday stop/go small
amount of highway. I’ll put 25K on the car this year.–
Cal Genereux '92 XJ-6 BRG 168K mi. Summerville, SC USA
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Certainly running a car hard will uncover weaknesses quicker.
As you note more heat is being generated and has to be handled by the
cooling system. If the cooling system is not in top condition you can be
quickly in trouble. The same thing is true for the lubrication system of
both the engine and transmission. These cars are designed to cruise.
However like any car the stresses increase with speed or load and good
maintenance becomes even more important.----- Original Message -----
From: “Muleears” agenereux@sc.rr.com
To: xj40@jag-lovers.org
Sent: Tuesday, January 03, 2006 5:17 AM
Subject: [xj40] Does higher speed cause that much more stress on my XJ40?
What I mean is does driving 85-90 MPH cause a great deal more
stress on my car than driving 70 MPH? I recently had a heater hose
blow while on the interstate after travelling for 3 hrs. at 85+.
Does it stress the tranny more? Engine? Cooling system? I know
higher speed and RPM will cause more heat, vibration etc. But is
the difference between 70 and 90 significant? My car has been
reasonably well maintained but she is approaching 170K miles, am I
pushing my luck with higher hiway speeds? I will average a 1K mile
trip once a month. Balance of the driving is everyday stop/go small
amount of highway. I’ll put 25K on the car this year.
Cal Genereux '92 XJ-6 BRG 168K mi. Summerville, SC USA
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In reply to a message from Muleears sent Tue 3 Jan 2006:
dang I’d be happy to get 70 m.p.h. out of Layla … it seems like
I really have to push her to get it … 85 would be out of the
question &:-/)–
The original message included these comments:
What I mean is does driving 85-90 MPH cause a great deal more
stress on my car than driving 70 MPH? I recently had a heater hose
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In reply to a message from AttyDallas sent Tue 3 Jan 2006:
Paul, you’ve got to be kidding, right?
Your car should accelerate to and cruise happily at over 100
mph - in fact the 3.6 Litre engine produces its maximum
torque at around 4000 rpm which equates to about 113 mph in
top gear with a 3.54:1 back axle so cruising at 85 / 90
should be a breeze!
Or are you just obeying the speed limits, being a man of the
law, so to speak? :-)–
The original message included these comments:
dang I’d be happy to get 70 m.p.h. out of Layla … it seems like
I really have to push her to get it … 85 would be out of the
question &:-/)
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In reply to a message from AttyDallas sent Tue 3 Jan 2006:
My baby a 1990 has 156,000 miles on her and 70 is an easy task. I
often cruise at 70 and 85 isn’t very hard to do. In my area I don’
t do 85 because I would stick out like a rabbit in a den of wolves.
When I go to see friends that live around the US Capitol on I95, it
seems people cruise at 85 and my 1990 cruises very well at that
speed. I am guessing it would do well over 100 but I really don’t
want to test a 16 year old car that hard.–
The original message included these comments:
dang I’d be happy to get 70 m.p.h. out of Layla … it seems like
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Well when my foot “slipped” recently my 1990 4L, 170K, was still pulling
strong at 125mph. My guess is that the wear will be higher the faster
the speed (for most things). However, given that the car is designed for
running at high speed I would expect the difference to be less than for
a car designed for a lower top speed.
In reply to a message from AttyDallas sent Tue 3 Jan 2006:
My baby a 1990 has 156,000 miles on her and 70 is an easy task. I
often cruise at 70 and 85 isn’t very hard to do. In my area I don’ t do
85 because I would stick out like a rabbit in a den of wolves.
When I go to see friends that live around the US Capitol on I95, it
seems people cruise at 85 and my 1990 cruises very well at that
speed. I am guessing it would do well over 100 but I really don’t
want to test a 16 year old car that hard.
–
The original message included these comments:
dang I’d be happy to get 70 m.p.h. out of Layla … it seems like
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Something seriously wrong with your car then. The XJ40 6 should cruise
effortlessly at 100 MPH. Do you have this issue with both cars? Ive had my
XJ12 to 125 MPH and it had a lot left, making me believe the advertsised 155
MPH top speed is achievable. I have had a 92 XJ6 to 95 plus and it didn’t
even break a sweat. At 18 years old at the time and driving my uncle’s car I
didn’t think it wise to go faster but clearly it was ready to do so.
Daniel
1994 XJ12
1995 XJS 4.0----- Original Message -----
From: “AttyDallas” attydallas2@aol.com
To: xj40@jag-lovers.org
Sent: Tuesday, January 03, 2006 3:02 AM
Subject: Re: [xj40] Does higher speed cause that much more stress on my
XJ40?
dang I’d be happy to get 70 m.p.h. out of Layla … it seems like
I really have to push her to get it … 85 would be out of the
question &:-/)
&:-)) Paul '88 XJ6 VDP 130k & '88 XJ6 VDP 180k
Garland, Texas, United States
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In reply to a message from Mark Webster sent Tue 3 Jan 2006:
I concurr with everyone who has no problem getting to 80 or 90 in
fact the car is at its best when crusing at 90 if I can ever find a
place to do it again. Our Hwy limit is now 60mph.John in Toronto.–
h s law
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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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Back about 4 years ago when my 93 was new to meat about 100k, my wife
got it up to 135mph before coming to her senses and slowing down. She
says that at that speed it still had more in it. I’ve had it up to
125mph on a nice, flat and deserted interstate in rural Texas and it was
just fine. Just make sure that your suspension is in good shape,
especially the various bushings. If all or most have never been changed,
take a close look to make sure they aren’t crumbling away.
Brian Welker
Dallas, TX
93 VDP
89 XJS convertible
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I don’t know what all the fuss is about! With 220+ HP 135mph is no
problem - I suspect the Europeans amongst us regularly achieve these
speeds without any bother.
NW
Brian Welker wrote:
Back about 4 years ago when my 93 was new to meat about 100k, my wife
got it up to 135mph before coming to her senses and slowing down. She
says that at that speed it still had more in it. I’ve had it up to
125mph on a nice, flat and deserted interstate in rural Texas and it
was just fine. Just make sure that your suspension is in good shape,
especially the various bushings. If all or most have never been
changed, take a close look to make sure they aren’t crumbling away.
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Even more important is tire condition and pressure as well as the condition of the wheel bearings. If any of these fail at speed the results can ruin your day.
Helps if you have good brakes to.
From: Brian Welker brian@fasterjags.com
Date: 2006/01/03 Tue AM 11:41:38 EST
To: xj40@jag-lovers.org
Subject: Re: [xj40] Does higher speed cause that much more stress on my XJ40?
Back about 4 years ago when my 93 was new to meat about 100k, my wife
got it up to 135mph before coming to her senses and slowing down. She
says that at that speed it still had more in it. I’ve had it up to
125mph on a nice, flat and deserted interstate in rural Texas and it was
just fine. Just make sure that your suspension is in good shape,
especially the various bushings. If all or most have never been changed,
take a close look to make sure they aren’t crumbling away.
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I have regularly seen 100 from my '94 3.2, and (briefly) an
indicated 130…on a German Autobahn of course, officer(!)
These cars were built for wafting along at very high speed,
cruising at 85 - 90 should be no problem. The manual states that
tyre pressures should be 34psi, but if running at speeds of less
than 100mph for much of the time, the pressures can be reduced. So
this should tell you how easy they are at the ‘‘ton’’.
Agree about the brakes, though. Two and a bit tons slowing from 100
has a lot more momentum to shed than from 70. Although I always
remember the Italian attitude to brakes…who needs them, they only
slow you down.
Regards,
Mark
'94 3.2 Auto–
The original message included these comments:
Even more important is tire condition and pressure as well as the condition of the wheel bearings. If any of these fail at speed the results can ruin your day.
Helps if you have good brakes to.
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What I meant by ensuring that the tires are good and tire pressure is goood is that there is a lot of cars running around in North America with grossly under inflated tires. You can get away with that if running at our rather low speed limits. However if you push the car hard tire temperatures rise dramatically and is probably the number one cause for blow outs.
In North America it varies a lot but mechanical inspection is often not a yearly requirement. In Ontario Canada where I live the only enforced vehicle certification is during ownership transfers. Often people use the “drive it until it breaks” method of maintenance.
From: “bonehead” mark.stott@tiscali.co.uk
Date: 2006/01/03 Tue PM 02:18:09 EST
To: xj40@jag-lovers.org
Subject: Re: Re: [xj40] Does higher speed cause that much more stress on my XJ40?
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John: as a denizen of the DC area, you’re right: the area between
Fredricksburg, Va., and just south of Springfield on I-95 is a race course.
you’ll get run over if you aren’t doing 85, which my '89 is very comfortable
doing. About 3-4 times a year, as large gaps in traffic permit, I take “Gud
KIty” up to 105-110 for short periods on our Beltway, I-495 … but only if
I’ve got the room to run between two “slugs” of cars and have the room to
back off and come up gradually on the back of the group running up ahead of
me. Gud Kity handles the excursion – or has so far – with good nature.
When I make family runs to Georgia and back on I-95 and I-20, there are long
stretches where 85 and 90 are the norm, typically in northeastern S.C.
Eliot Brenner
Annandale, Va.
89 xj40 at 131.5k
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In reply to a message from Eliot Brenner sent Wed 4 Jan 2006:
Speaking of tire condition and pressures versus high speeds.
Should I use the pressure recommended in the manual or that printed
on the tire itself? I beleive in my case they are considerably
different. Maybe 10+ PSI.–
Cal Genereux '92 XJ-6 BRG 169K mi. Summerville, SC USA
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Cal
The pressure printed on the tyre is the MAX pressure that the tyre should be
pumped up to, not the working pressure.
Those tyres will fit and will be fitted to a multitude of different vehicles
all needing different tyre pressures.
You need to use the pressures shown in the manuals specific to your model
and driving conditions
I suspect an XJ40 running at around 45psi ( or higher) would make for some
very interesting, and very dangerous handling conditions
Phil
From: “Muleears” agenereux@sc.rr.com
To: xj40@jag-lovers.org
Subject: Re: [xj40] Does higher speed cause that much more stress on my
XJ40?
Date: Wed, 4 Jan 2006 20:04:26 +0100
In reply to a message from Eliot Brenner sent Wed 4 Jan 2006:
Speaking of tire condition and pressures versus high speeds.
Should I use the pressure recommended in the manual or that printed
on the tire itself? I beleive in my case they are considerably
different. Maybe 10+ PSI.
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The correct tire pressure is dependent on vehicle weight. Therefore the same tire used on different weight vehicles will have different tire pressures specified by the vehicle manufacturer. The tire pressure printed on the side of the tire indicates the maximum pressure at the maximum rated load of the tire.
Sometimes an increase in tire pressure is indicated in owners manual for higher speed driving or for better handling. If so I would use those pressures.
In summary you should use what the manufacturer of the car indicates not the maximum tire pressure on the tire. (Unless you have a Ford Bronco with Firestone Tires, then you should probably walk).
From: “Muleears” agenereux@sc.rr.com
Date: 2006/01/04 Wed PM 02:04:26 EST
To: xj40@jag-lovers.org
Subject: Re: [xj40] Does higher speed cause that much more stress on my XJ40?
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that’s assuming the correct size of tire is used…–
The original message included these comments:
The correct tire pressure is dependent on vehicle weight. Therefore the same tire used on different weight vehicles will have different tire pressures specified by the vehicle manufacturer. The tire pressure printed on the side of the tire indicates the maximum pressure at the maximum rated load of the tire.
Sometimes an increase in tire pressure is indicated in owners manual for higher speed driving or for better handling. If so I would use those pressures.
In summary you should use what the manufacturer of the car indicates not the maximum tire pressure on the tire. (Unless you have a Ford Bronco with Firestone Tires, then you should probably walk).
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