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Thread: Tracking

  1. #1
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    Sep 2014
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    Tracking

    Any idea as to how much toe in should be on a Cobra fitted with Jag XJS suspension and a Rover engine fitted. (the car's a Viper). I want to get the car checked over but it's guaranteed they won't know where the suspension set up should be.
    Thanks in advance
    Nige

  2. #2
    Join Date
    May 2004
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    Perth
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    4,543
    Hi Nige,
    That's the problem with most of the modern suspension "specialists". They simply put in the registration number of the car and it tells them what t he settings should be. That's all well and good for modern production cars, but not for ours. I had issues with my 289 since replacing the steering rack just before Silverstone this summer and the car didn't feel planted especially at motorway speeds. I finally managed to track down an older guy who, although using the most up to date laser equipment, really knew his stuff and entered my car's details into his system as a mk1 Ford Escort. He set up the toe in and camber to those specs and the transformation was fantastic! He did suggest if I had more time he would do the corner weights too and could set the car up for whatever track I was going to! Since then I have discovered that he is the guy who sets up 289 Register member Rob Bremner's racing Cobra and Lightweight E Type. Perhaps you could speak to someone who could try those settings or perhaps those of a Capri or other front engined, RWD car.
    Cheers, Clive

    (If I'm not here, I'm either in my new workshop or on the golf course!)

  3. #3
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    Sep 2014
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    I think you could be right Clive. The car drives beautifully and handles really well, I find that on ordinary roads there's no problem whatsoever, but if you get up to high speed on an undulating road or one that has quite an uneven surface, it tends to become very twitchy and feels too precise as it then only takes slight movement of the steering wheel to make it "move" unnecessarily. It has a Fiesta rack fitted, but haven't a clue what it's set to regarding geometry as I've never had it checked since I bought it.
    Cheers...NIge

  4. #4
    Join Date
    Oct 2006
    Location
    Toton, Nottinghamshire
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    Nige,

    I found an old document on a memory stick with suspension settings for Jag IRS reputed to have been defined by Adrian Cocking.

    Front Tracking

    ½ degree toe in
    ½ degree negative camber
    3 ½ degrees castor (i.e. top ball joint behind bottom ball joint)

    Rear Tracking

    ½ degree toe in, must not toe out or be more than parallel or car gets vague feel
    ½ degree negative camber

    Tyre pressures
    19psi front
    21 psi rear

    I've got the Dax specs somewhere on paper but that will require a rummage in the loft for the right folder.

    Cheers,
    Russ.
    Joint Area Rep - East Midlands Region
    1984 DAX Cobra
    Rover 3.5 V8 with Holley carburetor.

  5. #5
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    Sep 2014
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    Thanks Russ, that's appreciated. 19psi isn't very much for the fronts is it?? I've taken my 225-60-15's down to 20 psi and it didn't particularly like it. It seems happiest around 23psi. If you do come across the Dax settings that'd be good to compare them to Adrian Cockings, but don't bust a gut looking for them. The Vipers Jag front suspension looks very similar in design to the early Dax and AK's, maybe they copied each others set ups?
    cheers...NIge
    Last edited by Outcast; 20-10-18 at 10:33 AM.

  6. #6
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    Oct 2006
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    Toton, Nottinghamshire
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    Nige,

    I agree that I think 20psi is probably on the low side for 15" rims. They need a bit more pressure in my opinion because of the taller sidewall profile. Lower pressures probably would suit lower profile 17" rims etc. I tend to run 22.5psi at the front and 24psi on the rears with 15" rims. It's all personal preference and does depend also on how hard the dampers are set as well.

    I'll see what I can dig out for you on the Dax suspension settings.

    Russ.
    Last edited by Russ-Notts; 20-10-18 at 10:54 AM. Reason: spelling
    Joint Area Rep - East Midlands Region
    1984 DAX Cobra
    Rover 3.5 V8 with Holley carburetor.

  7. #7
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    Sep 2014
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    Wales
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    Thanks Russ, I'm running 295-50-15's on the rear and they seem happiest at 24 psi too.

  8. #8
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    Sep 2010
    Location
    Nova Scotia
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    Quote Originally Posted by Outcast View Post
    I find that on ordinary roads there's no problem whatsoever, but if you get up to high speed on an undulating road or one that has quite an uneven surface, it tends to become very twitchy and feels too precise as it then only takes slight movement of the steering wheel to make it "move" unnecessarily.
    Mine was like that for years until I made a more precise front toe-in adjustment. Even on a smooth road, it felt almost like wind buffeting except there was no wind. Specs for my car called for 1/16" to 1/8" front toe-in. I can't remember what it was before the adjustment, but I set it for 1/8" and the problem completely went away.

    Just for interest I'll post my specs here even though it's only the rear of my car that has Jaguar suspension:

    Front

    Camber 0 degrees +/- 1/4

    Castor 4.5 degrees +/- 1/2

    Toe-in 1/16" to 1/8"

    Rear (Jag)

    Camber -3/4 degree +/- 1/4

    Toe-in 0.0" +/- 1/16"
    John

    my world... my universe... my garage.

  9. #9
    Join Date
    May 2011
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    Flimwell
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    Here’s what Dax suggest.
    Attached Images Attached Images
    Colin
    Dax Standard Chassis. Ford 302, AOD auto, DB s/s sidepipes, 2017 T reg.

  10. #10
    Join Date
    Jan 2006
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    Chelmsford Essex
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    510
    Conversion chart might be helpful
    Attached Files Attached Files

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