Visit The Dirt Forum for More Information

Author Topic:   upper a-frame swap?
DEEDDUDE
Dirt Maniac

Total posts: 111
posted November 18, 2001 05:45 PM
Has anyone ever swapped the stock upper a-arms from one side to the other on a small metric frame? Iíve been told that you lose all caster gain when running them as GM made them. This would involve running the upper mount parallel with the lower. Just wondering. I need to move the uppers anyway and this looked like it could work. Any thoughts?

KWTracer
Dirt Freak

Total posts: 233
posted November 19, 2001 07:17 PM
Yes, swap em.

DEEDDUDE
Dirt Maniac

Total posts: 111
posted November 19, 2001 08:38 PM
KW, did you run the upper mounts parallel to the lowers? Did this improve the handling? Thanks for the response. Deed

hughes
Dirt Maniac

Total posts: 141
posted November 21, 2001 08:23 PM
D-dude, what exactly are you trying to accomplish? more / less castor, I'm building a gran prix metric and take all the info I can get. Clear me up w/some detail.

DEEDDUDE
Dirt Maniac

Total posts: 111
posted November 21, 2001 08:39 PM
Hughes, Just trying to get the front end of thc car better. From what I'm told you loose caster as the right front goes into bump, and this takes weight off of the left rear making the car loose/looser. Most around here have moved the upper mount to correct this but they move them only close to parallel w/ the centerline of the car . Look at most race cars with tube uppers and the mounts run parallel to the lower mount pivot points. I was wondering if anyone has done this and if it is worth the trouble. I was also trying to find out if anyone would try to get zero-anti dive or whatever is need for a race car. Deed

hughes
Dirt Maniac

Total posts: 141
posted November 22, 2001 06:09 PM
D-dude, is that gonna get the castor close enough, so you don't have to move the upper A-arm mounts.

cut_n_up
Dirt Roller

Total posts: 20
posted November 26, 2001 10:46 PM
my ole man had a 80 olds and swapped his, he said he liked it better. but i dont know, i never drove his car.

CHAMP00
Dirt Full Roller

Total posts: 47
posted December 01, 2001 10:23 AM
So you guys are cutting the mountsw off the frame and movin the right to the left and the left to the right?? Champ

go4win
Dirt Full Roller

Total posts: 61
posted December 01, 2001 12:12 PM
one thing to think about on the castor
thing is that to actually get the car to
turn free the RF corner needs to drop .
once turned back towards the right, it should pick up and load
the left rear. this is done by the use of
positive castor on the RF . this can be
very effective on "point and shoot" racetracks( tight corners) . the wider radius
"sweeping" racetracks may require lesser amounts to keep the wieght from "laying down"
on the RF for too long during the corner.
Can those metric uppers just swap sides and
still clear ? I didn't realize that . Could you benefit from running both Left or Right side
A-arms instead of just swapping the set?

------------------
What next?

DEEDDUDE
Dirt Maniac

Total posts: 111
posted December 01, 2001 06:12 PM
Well guys since I couldn't get any advise on the swap I tried myself to see if it would work. It doesnít. It would work if the upper a-arm at the ball joint were parallel to the shaft. The ball joint keeps binding as if the car was going onto a turn. I could not get the mount parallel with the lowers either, kept binding at the front. I would have to raise the front of the mount. If you could run aftermarket mounts I believe it would work. Sorry but, I tried. Deed

Back to the Archives