retro-fit cruise control

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    • #3481
      Trevor Kent
      Participant

      Hi,

      Thought I’d posted this query yesterday but clearly my IT skills are not up to it! Can I have advice from anyone who has fitted cruise control please. Mine is a 1987 XJ.SC 3.6 auto. Trevor Kent

    • #3485

      Hi Trevor have never seen a 3.6 with Cruise Control I would have thought the car would need to be Automatic to start with,
      The V12’s all had it but initially it was proven to be lethal. I was coming off a motor way in the early days 1986/7 and it would not cut out when I hit the brakes quite hair raising & frightening, Jaguar all but called me a liar and said it was not possible. Just a few months later there was a re-call after someone had been killed.
      There is nothing in the parts book re parts for 3.6 cruise control.
      Pleased to see you are still with us Trevor from around 2011.

      • #3533
        Trevor Kent
        Participant

        Hello Bleasie,

        I am delighted you’re still about too!! I well remember meeting you at Silverstone and my son winning a Jaguar holdall at your raffle!

        I don’t seem too confident that my need for cruise control (bad right knee!) will be satisfied but I shall continue my search!

        All the best,

        Trevor

    • #3492
      Laurence Jones
      Keymaster

      The facelift 4.0 litre models do have Cruise Control as an option< so you might be able to retro fit one to your 3.6 Automatic Trevor. I have a donor 1995 4.0litre XJS auto, with Cruise Control, which at some point in the future I'm hoping to dismantle and reassemble in either my 1994 Couple or possibly the 1993 Convertible - all something for the future at the moment I'm afraid. Laurence

    • #3535
      Trevor Kent
      Participant

      Thanks Laurence, I hope I’ll find something soon as right knee now giving me considerable gip on long runs!!

      Cheers,

      Trevor

    • #3605
      Robin
      Participant

      Hi Trevor, Cruise was indeed an option on 3.6l XJS both cabriolet and coupe. The earlier system was AE Econocruise but in Feb 1987 was replaced with the more sophisticated Hella ‘computer’ cruise. (Source Skilleter – says vin 108285 roughly)
      Same 1987.5 model year revamp they introduced wood veneered ski-slope.

      If yours is a 1987 it might be quite straightforward..

      The system is however a little more complex than you might think at first sight but I believe should be retrofitable to cars post Feb 1987. I don’t think anyone would recommend the Econocruise version but the Hella by all accounts is a reliable and sophisticated system.

      Components:
      Ski-slope switch & mounting, ECU which fits under passenger foot board next to main 3.6l engine ECU, brake pedal actuating double switch (and single clutch switch on manual cars), solenoid vacuum valve fits on N/S inside engine bulkhead, Actuator bellows, tubing and linkage to throttle.
      I haven’t mentioned wiring or relays either but I think will be already in harness on post 1987 cars. I cannot confirm that but my Sept 1987 certainly has an extra plug in footwell next to location for the cruise ECU.

      The 3.6l (& 4.0l) models use a totally different system to that on the V12 cars so no major components are the same (happy to be corrected)

      My own cab does not have cruise but I have slowly been gathering the required components myself for future fitting. The ECU latest version is cheap enough at circa £20 brand new off eBay, console switches quite costly as are the bellows as often second hand ones look poor. Double brake pedal switches (cruise and brake light) are more difficult to find but I’m sure if you approached one of the known Jag breakers like ‘JustXJS’ at Derby they could source all the necessary parts.
      The parts aren’t really that costly.
      The missing ingredient is whether the existing wiring loom has the connections already there and I cannot confirm that myself yet..

      If anyone has actually done the modification on a post 1987 I would also be most interested to hear of any pitfalls..

      Regards, Robin

    • #3608
      Robin
      Participant

      Parts References for 3.6l Cruise Control – poor pics but shows where to get the info!

      Photo 510

      Photo 509

      Photo 508

    • #3626
      Trevor Kent
      Participant

      Hello Robin,

      Thanks for your detailed and thoughtful reply. I am positively NOT a bonnet-lifter I’m embarrassed to admit. I’ve come across http://www.bridgwater-electronics.co.uk who say they have a unit which will do the job. My local Classic Jag garage think it will work and have suggested just today that I buy the kit! What do you think?

      Cheers,

      Trevor

    • #3628
      Robin
      Participant

      If it works well then could be a good option. I imagine will be similar to the Jag ‘Econocruise’ early system which was also an aftermarket fitment originally, before being offered by Jaguar as an option in production.

      Modern electronics might have benefits too.

      Let us know how you get on if you go that route, be most interested.

      Regards, Robin

    • #3681
      Trevor Kent
      Participant

      Shall buy kit on Monday and drop it and SC to Powerbell Maidenhead to do the magic bits! Will let you know! Trevor

    • #3897
      Laurence Jones
      Keymaster

      Hi Trevor

      Any update to share on your Cruise Control install ?

      Laurence

      • #3910
        Trevor Kent
        Participant

        In classic TK style I haven’t done a thing. One reason – I’ve no idea whether my accelerator linkage is ‘wire’ or ‘electronic’ as there appears to be a different ‘kit’ for each. All I know is, on a short run into London yesterday my right knee hurt like a ……. so I must get round to doing something before the touring season, Southern Ireland and France already planned!! Cheers, Trevor

    • #3960
      Trevor Kent
      Participant

      Bridgwater Electronics kit for cable accelerator version purchased. Powerbell booked to fit next week – fingers crossed. Bleasie tells me a faulty Cruise Control nearly killed him once – but it was standard not retro-fit, so hope I shall be able to post here for many more years!!!

    • #4421
      Trevor Kent
      Participant

      Only partial success – gizmo fitted close to accelerator cable in engine bay (as you can tell, I’m no bonnet-lifter sadly) but then discovered another bit needed to be fitted to speedometer, ordered from Bridgwater (shame they didn’t tell me about this extra) now awaiting further fix at Powerbell.

    • #4427
      Jon Scales
      Participant

      Interesting about the Cruise Control not fitted on the 3.6 Auto, as posted by Bleasie further up. Ours has it!!!!

    • #4431

      Well Jon you know what they say you learn something every day.

    • #4833
      Trevor Kent
      Participant

      Well it’s finally been completed. Despite parts supplier assuring me and Powerbell (Taplow) that the first delivery contained everything needed to fit a 1987 XJ-SC 3.6 Auto RHD this turned out not to be so, and a further bit had to be purchased! Total cost about £750 and full marks to the patience shown by Powerbell doing a job they had never done before (and I doubt anyone else has either). Doing JEC Ireland Rally soon – that should give the system a good test!!

    • #4845
      Laurence Jones
      Keymaster

      Hi Trevor,

      If it means you can be comfortable driving your Cabriolet the distances you do, then it will be a great success.

      Enjoy your tour around Ireland

      Laurence

    • #4955
      Richard Salt
      Participant

      Just as an aside to all this, the 85 Cab has a crude mechanical/vacuum system. I scrapped mine long ago, its ok when new, but not good as it ages.
      The tiny brass strip flap valves don’t seal any more and speed can’t be held.
      Of course these tiny bits can’t be bought so you’re faced with buying the complete unit – if you can find one.
      Anyway, taking the big vacuum cylinder out means more airflow across the engine which is good.

    • #5307
      Trevor Kent
      Participant

      1250 miles in under a week on the JEC Ireland rally and the cruise control worked flawlessly. Shortly another 1500 or so in France and Belgium – what a delight to give the right leg and knee a rest every so often! Have a great summer all softies!

    • #5327
      Laurence Jones
      Keymaster

      That’s great news Trevor, really pleased about that news.

      Wish I had time to go on a few day/week tour in one of our XJS, but have to restrict it to annaul holidays or long bank holiday weekends for now.

      Laurence

    • #7036
      Trevor Kent
      Participant

      In the end 1300 miles in France and Belguim, CC still working perfectly! Local village Classic Car show today but seemingly 2″ rain already fallen this morning so doubt I or anyone else will risk it, shame!!

      • #7177

        Well Trevor Kent you certainly proved me wrong glad to hear not only did the conversion go well but that the trips went well.
        Why not put the story of the conversion together and get Laurence to post it will save future owners having to start from square one Just a thought.

        BLEASIE

    • #13465
      Trevor Kent
      Participant

      Another 1100 miles on JEC Ireland tour (10 XJS’s this year, 50 cars in all, one XK120, 2 Mk 11’s, 2 E-Types et al) just completed. Retro cruise control still 100% !

      However lost headlight flasher and horn during trip – not being a bonnet-lifter as I’ve always embarrassingly admitted to all, I can only assume a fuse problem. Next problem – what’s a fuse and where is it!!

       

      Happy Softing !

       

      Trevor

    • #13477
      eddiepanton
      Participant

      many moons ago i test drove a 3.6 manual coupe (complete shed) and im sure it had cruise control. there was a stalk on the left side of the steering column, didnt think to see if it was cruise but cant think what else it could have been. As soon as i saw the car I wasnt interested as in my opinion it was a parts car

    • #14637
      Geoff Pedlar
      Member

      Interested in what Richard Salt refers to as “the crude mechanical/vacuum system”, are you refering to the V12 ?

      Do we mind if we expand the discussion to the V12 vacuum system ? My CC doesn’t function but its not important to me so I haven’t looked at it yet. On the other hand I do like all parts of a car to function properly so maybe this will trigger me to action ! I am hands on.

      So Richard please let me/us in to the secret, where are these “tiny brass strip flap valves” and the “big vacuum cylinder” too please.

      Many thanks

       

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