Front Suspension Shimming
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Thread: Front Suspension Shimming

  1. #1
    Just Some Dude in Jersey My location The Scifi Guy's Avatar
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    Front Suspension Shimming

    I read a post by Frozen Tundra a while back where he said something about shimming the front suspension. I don't know what he did and I could just ask him, but I figured that maybe this deserved a thread.

    I had to put a stack of shims on the right side of my Red Baron car because the frame rail that the suspension bolts to was inaccurately repaired by the PO of that car. But I'm suspecting that Jimmy shimmed his for a different reason.

    My thinking is that we could get more caster adjustment if we shimmed the front mounting bolts on each side with a washer or plate between the frame rail and the suspension. Just shimming the front bolting area would tilt the front suspension backwards a little. The only oem adjustment is the lame washer swap at the A-arms.

    I'm curious about this as an experiment to see if it would help my steering return to center after a sharp turn better. My negative offset wheels have a tendency to want to oversteer on sharp turns and you have to fight them a little bit to get them to return to center.

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    2000 Post Club Site Supporter My location P.J. Romano's Avatar
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    Interesting idea but there is easier way to increase the caster over Opel's pretty limited adjustment range. First, move all caster shims to the rear. You may go even further and shorten the pivot tube at the front and add the same amount of shims at the rear. Every 3 mm (1/8") will give you approx. 2 degrees of caster.
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    Old racers never die. They just go bench racing.

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    Just Some Dude in Jersey My location The Scifi Guy's Avatar
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    Oh, I can do all that stuff? Excellent!



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    Caster

    Yes,it works.A friend who races in Germany uses a wedge shim to adjust caster.He said it works great very hard for tech to find.
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    Tennessean Site Supporter My location hrcollinsjr's Avatar
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    I did this with my first GT. Get a caster reading and have custom wedges/shims made to get the caster you want. My caster was different from left to right so my two shims were different thicknesses.

    Harold
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    Just Some Dude in Jersey My location The Scifi Guy's Avatar
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    I've seen those long, slight tapering, wood wedges that carpenters use to get doors and windows just right and I have access to short, inch or so, metal wedges for mounting electric motors and such, but where can I get longish(6") very shallow rising metal wedges appropriate for shimming our from suspensions?

    Yeah, it's actually wouldn't be too much trouble for me to make my own metal wedges by sanding down some bars/strips of aluminum I have on my belt sander, but it would be nicer if I could find pre-fabbed metal ones.

    This looks like a job for Lindsay. He always comes through when I pose a question like this.



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    Tennessean Site Supporter My location hrcollinsjr's Avatar
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    Quote Originally Posted by The Scifi Guy View Post
    ....where can I get longish(6") very shallow rising metal wedges appropriate for shimming our from suspensions?
    At the time I shared a few students with a machine shop class. The drafting teacher down the hall drew up the dimensions. Ahh, times were good back then.

    Harold
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