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My 1987 3.6 Sovereign

xjr41
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Joined: Tue Jul 08, 2008 9:27 pm
Location: Swindon, England
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Re: My 1987 3.6 Sovereign

Postby xjr41 » Thu Jul 18, 2019 1:36 pm

Does removing cats make a noticeable difference?
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1993 XJR Westminster Blue - Second To Last RHD Manual Built - under restoration

pimgmx
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Location: South East of the Netherlands

Re: My 1987 3.6 Sovereign

Postby pimgmx » Thu Jul 18, 2019 1:45 pm

xjr41 wrote:Does removing cats make a noticeable difference?

Yes, on almost any car improved flow results in improved performance.
Old school cats are seriously restrictive and negatively impact exhaust flow, thus performance.

A free-flow exhaust on a 5.3 V12 can free up anything up to 30 additional horses, i.e. > 10%...

the daily: 01 S8 http://bit.ly/2kIwP4m
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stevemc
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Re: My 1987 3.6 Sovereign

Postby stevemc » Thu Jul 18, 2019 1:47 pm

xjr41 wrote:Does removing cats make a noticeable difference?


ohh yes a big differance thing is mine does not need cats fitted as was pre cat so will pass the MOT if your car had them fitted then to pass MOT you need to refit them everytime before the MOT
Jaguar xj40 1986 build D513 NBU vin number ends 504501
Audi A4 Sline 2016
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xjr41
Posts: 2055
Joined: Tue Jul 08, 2008 9:27 pm
Location: Swindon, England
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Re: My 1987 3.6 Sovereign

Postby xjr41 » Thu Jul 18, 2019 2:31 pm

Well the Jaguar sport XJR doesn't even have any emissions levels in the system, as far as I know they test under a standard XJ6. Now if you wanted to be really pedantic you could argue the case that those emission levels are wrong and as long as the car can pass some catch all emissions levels then you would be golden to not run any cats.
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Visit Jaguarsport-XJR.com - The home of the XJR.
1993 XJR Westminster Blue - Second To Last RHD Manual Built - under restoration

david
Posts: 6586
Joined: Wed Aug 06, 2008 8:09 pm
Location: Cheshire, UK

Re: My 1987 3.6 Sovereign

Postby david » Fri Jul 19, 2019 12:29 pm

stevemc wrote:
david wrote:What colour is it?


westminster blue one in signature



I should have remembered that - I have asked you about it before. IIRC, your VIN is a few hundred cars before the one my dad had.
Image 1992 Sovereign 3.2 diamond blue (1993 model)

xjr41
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Location: Swindon, England
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Re: My 1987 3.6 Sovereign

Postby xjr41 » Fri Jul 19, 2019 2:52 pm

xjr41 wrote:Well the Jaguar sport XJR doesn't even have any emissions levels in the system, as far as I know they test under a standard XJ6. Now if you wanted to be really pedantic you could argue the case that those emission levels are wrong and as long as the car can pass some catch all emissions levels then you would be golden to not run any cats.


Anyway this is all nonsense because the new MOT rules demand a visual inspection for a cat on all cars that were built with cats. So no way I've getting past that unless change the downpipe for every MOT.

Which is a bugger really as part of my mods that I had in mind was a pre cat downpipe and a custom stainless exhaust
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Visit Jaguarsport-XJR.com - The home of the XJR.
1993 XJR Westminster Blue - Second To Last RHD Manual Built - under restoration

Indiana_Jones
Posts: 79
Joined: Wed Sep 14, 2016 9:46 pm
Location: New Zealand

Re: My 1987 3.6 Sovereign

Postby Indiana_Jones » Sun Jul 21, 2019 12:35 pm

david wrote:It is good to see a nice early car on the forum - with the earlier style door mirrors, plenum cowling, early clock and Clarion Jaguar radio - and even the black sticker on the cam cover. They are rare cars now.

These very early cars had a loud 'fasten seatbelt' buzzer warning along with the light on the dash. My father had one of the early cars like this one (his was Feb '87 registered) - and the first thing he had done on the car was to have the seat belt warning disconnected. It was excessively loud and intrusive and removed from slightly later cars so it is likely he wasn't alone in this view. This could have been what has happened with your car.


Cheers for the post mate, yup, the early car has grown on me. Haven't posted lately, have been busy with work etc, but managed to do a bit of pordding about last weekend, trying to find rust. Have found some at the front of the sills and the bits around the rear window. Need to decide the next steps!

Also the seat belt buzzer has only ever come on once, have never heard it since lol
1987 3.6 Auto Sovereign 506111