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tri-link rear suspension

Old 01-13-03, 07:31 PM
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Smile tri-link rear suspension

Does anyone out there have the dimensions for a tri-link 3rd member - being cheap, I want to build one rather than buy one.

I plan to turn my half built ita 7 into an EP car, and it currently has a stock rear set up - not good!

Dimensions such as overall length, bend angle, length of the member either side of the bend, tube diameter, wall thickness and heim joint size would be helpful.

I would also appreciate the skinny on the attachment in the tunnel area - pictures, photos, descriptions etc.

Second question - I have a couple of Leeson close ratio transmissions. Would this count as an alternate dog ring trans (ie. add weight), or is it counted as stock given that the gear kit is installed in a stock housing?

Appreciate any help you folks could offer
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Old 01-13-03, 08:55 PM
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If you're looking for info on Susko's tri-link setup, good luck! Everybody else had to pay $75 for the info and are not going to give it up freely.

We built our own tri-link and panhard for our ITA car. It seemed to work well, but I'm sure as we get faster, the limits of our design will start showing up. There may be some pics of it on our website, but the body mount "T" was made from 3/8" plate mounted just above the yoke, the axle was a plate shaped like a Z from above with adjustment holes. If I recall correctly, the longest we could get the bar was 9", center to center of the heim joints.

Hope that helped!

Now to send off for the Susko book....
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Old 01-18-03, 04:00 AM
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from what i've read and the set up that I have made for my rx3 there is some good starting points for rear geometry. the lower bars are set to whats in the car and the upper is 3/4 the length of the lower. also the lower bars are kept level and the upper are from 7 to 14 deg. down and ajusted to traction vers. push. panhard bars are as long as posible and have to be very strong and well ancord. I put both my upper arm and panhard on roll bars and used sliders for more ajustabilty. also used a dampend third link. Colman sells most of the parts to build a good set up and lots of circle track guy use this set up. good luck and ill try to get some picture scanned for you
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Old 01-21-03, 08:41 PM
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the trilink in my 81 rx7 is angled down 6 degrees and it is 19 inch long shaft plus the two heims. mounts to crossmember INSIDE the car which is legal for GT3. also stronger and better geometry than the S shaped tri-link that has to be run in ITA and EP since they can't have suspension inside the car. those S shaped ones have snapped under braking when the rear suspension gets light.

How do you adjust a tri-link for traction vs push? circle track guys put a spring in the middle of the tri link to change the pinion angle during acceleration, they say it gives more bite.

try to find one of those southwest touring cars, you know the big nascar type circle track car. they got lots of good stuff.

-bp-
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