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Topic Review (Newest First)

  • 22-04-2010, 18:26

    Re: Pinion angle

    Well ive just measured my gearbox angle and where the rear seal is i have precisely 1.3% down bubble (from a spirit bubble not any angle on the suspension)

    I think i know the the problem with me having to much traction under torq and not enough under top end

    Diff angle around 9%

    The good thing was there was no vibration (well not noticeable)

    So when i re mount the rear end looks like ill be changing the angle

    Do you think that i should change both or just mount the rear to match the front
  • 06-04-2010, 11:08

    Re: Pinion angle

    Quote Originally Posted by Plumpcars View Post

    Vince, this is for a 4 link but it explains the relationships between instant centre/CofG/ neutral line.
    I have found this site that i was going to use the info for setting up the shackles but again they dont (not found yet) show the pinion angle, but im not to sure that the pinion angle in a race car would be of much use on roads (espeacially on a car that goes around in muddy circles)
  • 06-04-2010, 06:07

    Re: Pinion angle

    Vince, this is for a 4 link but it explains the relationships between instant centre/CofG/ neutral line.
  • 06-04-2010, 05:35

    Re: Pinion angle

    Vince I'm sure these days the information must be on the internet as well. Look for setting up/drag racing/instant centre. You can then draw yourself two rectangles, one with standard ride height and one moved up. See what it does to the lines through spring mounts. I bet you find you can work with stock mounts but have to play with the traction device to get things right.
    The most adjustable race set up is a 4 link and on that the IC can change but leaf springs can be set up to plant tyres...just make sure they don't unplant them! Also be totally honest with yourself about the intended use of the car.
    Andy Robinson? Don't forget what car he started with!

    PS. Dont forget that setting up a car for racing involves the front suspension as well. For the road that has to be set up to work in different situations so your rear set up has to work in conjunction with a road front set up.
  • 06-04-2010, 03:18

    Re: Pinion angle

    mines 5degrees as thats what the back of the gearbox flange was after leveling the carb base on the inlet ......Guy
  • 05-04-2010, 21:36

    Re: Pinion angle

    Vince give Andy Robinson a call, he will give u all the advice u need, he is a very approachable chap but dont call him b4 12 noon as he doesnt answer his fone, 01256 880589, but as far as i know the angle is 3 degree's

  • 05-04-2010, 21:14

    Re: Pinion angle

    May be worth an e mail. Also try a book on setting up doorslammers by Dave Morgan.
  • 05-04-2010, 21:01

    Re: Pinion angle

    Ive tried to find the book that has been recommended but all i can find is a website to chris alstons chassis works but no book
  • 05-04-2010, 20:43

    Re: Pinion angle

    No they don't pivot in the same way but the instant centre would work the same way ie: the front spring eye of the leaf would be the IC same as the front mount hole on the ladder bar. What you will probably have to do is experiment with the height that you mount the front spring eye to alter where your IC lies on a line in relation to the centre of gravity of your car. This is where my experience is lacking, I can't give you a start point.

    You might consider new tyres as well
  • 05-04-2010, 20:27

    Re: Pinion angle

    Quote Originally Posted by Plumpcars View Post
    Vince I don't have the experience to guide you as I said others on here know more than me. I think if it was me I would be looking at setting the pinion angle for street use when mounting the axle and then making plenty of calculations depending upon what traction device you end up using.
    Correct car geometry is thrown all over when you change ride height, both for steering and traction, so a degree of experimentation will probably be needed.
    with respect sir, everything you have stated so far has been pretty accurate
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