XJ6 & XJ12 Series I, II & III 1968-1992

Any Ideas how fast an XJ6 will go

 
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Old 11-25-2014, 06:20 AM
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Default Any Ideas how fast an XJ6 will go

Question: Is this car capable of 115-120 mph? That is what the speedo was swaying between at one point today. I have had around 100mph a number of times for short stretches of say 2-4 km of road, but today I found a long empty road(controlled environment and not a public road of course,just for any bureaucrats that may have snuck in with the humans).

The piece of tarmac was about 5-6 km long with no one in sight so I just floored the XJ6 for the full length, RPm was sitting around 4700-4800 and speed between 115-120mph.

Temp was normal the whole time ,even for a 37c day outside. Would you consider this a real speedo reading or not accurate?

I did not have a GPS with me to verify the speed, but it certainly felt like 200 kph.
 
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Old 11-25-2014, 06:38 AM
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About the mark for the revs you were pulling.

Late for beer o'clock again were we??????????.
 
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Old 11-25-2014, 06:48 AM
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Originally Posted by o1xjr View Post
Drove around 380km(256 miles on my speedo) round trip today to have a cold beer and steak sandwich with a mate during his lunch break in Kyogle.
Took the freeway there and the back roads home, handled great on the back roads between 40 and 80mph.

Attachment 101409
It may have been a 4 lane concrete freeway somewhere between Brisbane and Surfers Paradise. Got held up at a truck roll over for twenty minutes before they started letting cars through the two unblocked lanes!

Soon carved my way to the front and made up the lost time(yep late for lunch). Oil pressure was at about 15 psi, but the mechanical gauge I had on it a couple of weeks back said I have 50 psi at 3500 rpm, so just kept that peddle to the metal (or carpet)as they say.
 

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Old 11-25-2014, 09:21 AM
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Actually, Clarke, there is a metal stud to limit accelerator travel and keep one from literally sticking one's foot through the firewall. So you did indeed have the pedal to the metal.

My car is admittedly a bit different, but you do ask how fast an Xj6 will go not how fast an XK engine will go. I've had Nix at 135mph a time or two in search of top end (which I have yet to find as I ran out of road) with those new tires, and everything was smooth as silk.

It was exhilarating!

I do like to drive fast. I've even had Wart to 100mph when I'm in a big hurry but it isn't smooth.
(';')
 
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Old 11-25-2014, 09:31 AM
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Originally Posted by LnrB View Post
It was exhilarating!

I do like to drive fast. I've even had Wart to 100mph when I'm in a big hurry but it isn't smooth.
(';')
Exhilarating in a V8 Jaguar,yes.

But a hundred mph Ford Windstar is just plain scarey!
 
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Old 11-25-2014, 09:53 AM
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Originally Posted by o1xjr View Post
Exhilarating in a V8 Jaguar,yes.

But a hundred mph Ford Windstar is just plain scarey!
I don't do that if anyone is with me. Both cars handle completely differently with a load in the passenger seat. Wart has the most deterioration in performance, Of course, even with the new Michelins husband had me put on recently.
(';')
 
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Old 11-25-2014, 09:59 AM
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I can safely say here Bluey won't do 100mph. About 140 kph is the absolute limit.

Any Ideas how fast an XJ6 will go-dsc_0999.jpg
 
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Old 11-26-2014, 01:54 PM
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The speedo on both my 80s cars are accurate , what they read agrees with a GPS speed and agrees with a couple of roadside speed check displays we have in VIC. My wifes Subie gets increasingly optimistic with speed so to do 110kph you need to see 120 on the speedo.

If you know that you were doing 4700 RPM it should be possible to calculate road speed using that mathematical stuff if you can find enough beer and enough calculators.
 
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Old 11-26-2014, 09:46 PM
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i didnt hit 220 kmph in the xj a couple months back, it was the fastest it would go though
 
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Old 11-27-2014, 10:31 AM
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Steve:


Yeah, I composed a detailed posting on maths and more. IE11 ate it before posting.


LnrB:


The metal stud is there to prevent an over center. Not good, stuck "wide open". Been there, but with much less HP, so not as critical!!


Daughter comes later with thanksgiving lunch/dinner.


Happy thanksgiving from Coco and I.


He has had his breakfast and outing and I am sipping my AM coffee.


Jaguar 3/4 fixed. Football tonite. All is well in the Hutchins homestead.


Carl
 
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Old 11-28-2014, 12:19 AM
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How about an honest 120mph, four up, in a Datsn 510? They were only 1600cc.

Before anyone says anything, it had a ported head and triple-S intake with huge upsized
SU carbs from a junkyard Rover.
 
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Old 11-28-2014, 04:04 AM
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Originally Posted by o1xjr View Post
Question: Is this car capable of 115-120 mph? That is what the speedo was swaying between at one point today. ..........
YES - but not for sustained periods!

I owned both Series I and II when they were current models and have a history of dropped valves, cooked pistons and failed big ends on a number of XK straight six 4.2 litre engines.

Graham
 
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Old 11-28-2014, 04:49 AM
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Originally Posted by GGG View Post
YES - but not for sustained periods!
It was probably for a total of 1 1/2 - 2 minutes.
 
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Old 11-28-2014, 09:46 AM
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Originally Posted by o1xjr View Post
I can safely say here Bluey won't do 100mph. About 140 kph is the absolute limit.

Attachment 101425
Clarke, you need a couple more cars. I see there are still parking spaces on the street in front of your house.
(';')
 
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Old 11-28-2014, 10:02 AM
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I once met an older Lady from South Dakota. She had once owned a Series I XJ12. She no longer owned it as she received a speeding ticket of over 120mph in the Jag. Her husband sold it because of the ticket, as she would not slow down. This meeting was in the middle 90s and the Lady was in her 80s. Yes a Series 1,2, or 3 can sustain speeds over 100 mph for long periods if properly tuned and maintained. Why else would the XK120 with the XK engine have set 5 world endurance records? I ran my Series 1 and 2 XJ6s hard to work as daily drivers for more than 10 years. Hard to maintain these speeds today with the congestion and the US drivers that cannot fathom driving without distractions.
 

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Old 11-28-2014, 11:55 AM
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Originally Posted by Jagfixer View Post
I once met an older Lady from South Dakota. She had once owned a Series I XJ12. She no longer owned it as she received a speeding ticket of over 120mph in the Jag. Her husband sold it because of the ticket, as she would not slow down. This meeting was in the middle 90s and the Lady was in her 80s.
Good for her!! Too bad she was married to such a wus.

If you've ever been to South Dakota you know there's basically NOTHING for mile after mile after mile; not unlike Montana. If you want to get anywhere, you have to drive to Get There.
[...] Hard to maintain these speeds today with the congestion and the US drivers that cannot fathom driving without distractions.
No one pays attention to their driving, on the street or on the open road. California has strict laws about texting while driving yet at least once a week I find myself behind a less than stellar driver, wandering between the ditches, who, when I finally get around, is fooling with a phone.

I actually called in and reported one of them once, who was crossing a double line on a blind curve, forcing oncoming traffic to take evasive action, scaring the **** out of everyone on the road. CHP rounded him up and threw the book at him as he was known to them for other infractions.

That felt Good!
(';')
 
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Old 11-28-2014, 02:54 PM
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my car has NEVER been over the posted limit!!!! just in case anyone important is reading this!!! LMAO
 
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Old 11-28-2014, 03:21 PM
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Originally Posted by Darrenmb View Post
my car has NEVER been over the posted limit!!!! just in case anyone important is reading this!!! LMAO


(';')
 
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Old 11-28-2014, 08:34 PM
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Originally Posted by GGG View Post
YES - but not for sustained periods!

I owned both Series I and II when they were current models and have a history of dropped valves, cooked pistons and failed big ends on a number of XK straight six 4.2 litre engines.

Graham
That's a bit delicate.

The Datsun above, before the triple-s intake, used to be held at 5K rpm in fourth gear
for hours. The trick was to feather out the manual choke a touch to run it richer,
and run the tires on the white lines to avoid the hot asphalt. Alternating from side to
side of course. Little 165x13 78 series belted snows run at 40psi in summer
 
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Old 11-29-2014, 05:28 AM
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Originally Posted by LnrB View Post
Clarke, you need a couple more cars. I see there are still parking spaces on the street in front of your house.
(';')
We have
1.Mazda 3
2.Honda Jazz
3.KK Cherokee
4.XJ6
5. Vectra
6. Bonneville
7.Camper
8.Box trailer and bike trailer.

I don't need more, I need to offload.

Any Ideas how fast an XJ6 will go-dsc_0999.jpgAny Ideas how fast an XJ6 will go-dsc_0209.jpgAny Ideas how fast an XJ6 will go-dsc_0208.jpg

Looks like "Paulyling" lost his signature picture space to Bluey.
 
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