• Hi Guest!
    If you appreciate British Car Forum and our 25 years of supporting British car enthusiasts with technical and anicdotal information, collected from our thousands of great members, please support us with a low-cost subscription. You can become a supporting member for less than the dues of most car clubs.
    There are some perks with a member upgrade!
    **Upgrade Now**
    (PS: Subscribers don't see this gawd-aweful banner
Tips
Tips

TR6 A TR6 with Jag ball joints

Share this page

Re: A TR6 with Jag balls

You guys are right. But why does J.K. Jackson endorse the Jag ball joints and extra caster?, he is an expert at tr6 performance and has been more successful than most racing them. Im thinking that the design flaw and the inherent tire scrub (understeer) on sharp turns has something to do with the ackerman steering ---too much or not enough??
 
Re: A TR6 with Jag balls

Does J.K. Jackson suggest using these balljoints on a street car with no other suspension modifications or is he referring to race modified suspensions? They are two different worlds.

/ubbthreads/images/graemlins/cheers.gif
 
Re: A TR6 with Jag balls

This was a recomendation from a Grass Roots Motorsports article where he did a chassis and engine tuneup on a TR6 that was a street and autocross car, not unlike many of our improved tr6s with the standard upgrades. The front suspension had heavy duty springs and koni shocks. He recomends 3 degrees positive caster which you will get with the Jag ball joint and shims.---sometimes those two worlds are not that different.
 
Re: A TR6 with Jag balls

ok,
the problem with the front suspension is this:
the upper control arm is pointed down from the inner attachement to the outer attachement.what this does is, as the wheel moves up (as the outer front wheel does in a corner) the wheel LOSES camber until the upper arm is horizontal (this is a simplification) which is in the opposite direction required for traction. the jag ball joint raises the outer rotating point which is like angling the upper control rod up a slight bit. this helps the outer front wheel get to and past the zero camber point sooner. lowering the front end and jag ball joints all help to solve the camber problem. ideally the lower control arm would be slightly angle up and the upper angled up a little more than the bottom. if you look at your triumph, both are angled DOWN. the front ends need work but there are improvements.look for "goodparts" to improve your 6.
rob
 
Re: A TR6 with Jag balls

HI Rob, OK. that makes sense, they use to lower the upper control arm mounting point 1" on the early mustangs (originally shelby mustang)to come up with the same results. At the most I would say the Jag ball joint lifted my outer upper control arm up 1/4", in theory I guess that might help a little,J.K. Jackson never mentioned this part of it, where did you get your info about the Jag ball joint raising the control arm and any info on the caster part of it?
 
Re: A TR6 with Jag balls

Hello Allan,

I'm sure that the caster modification is only a small part of his racing car suspension alterations.

Alec
 
alan,
it does not raise the control arm itself, but the pivot point. the line from the inner pivot point to the outer pivot point is the mathematical line that is part of determining the true suspension geometry. this is not explicetly explained, but the info comes from kas kastners books. he personally signed mine when i ordered directly from him on his website.
rob
 
Re: A TR6 with Jag balls

Rob and Piman, I did understand about the piviot point---the ball joint slightly raised the pivot point line by raising the outside of the arm at the ball joint. Piman, as I had mentioned in a couple of post above the one project car that J.K. Jackson worked on in the GRMS Mag. article was mostly stock with heavy duty springs and koni shocks and Jackson recomended the Jag Joints at 3 degrees positive caster. Well, Im going to give it a try and report back on this later. Thanks for all the opinions/help.
 
Back
Top