Wasnt that flexing that the cage does when the swing arm goes up and down a form of passive 4 wheel steering? Its not a bug its a feature! I can see why you would want to get rid of it for racing though.
As you suggest, Lister used precisely that, a rubber bush where your forward rose joint is for their 7 liter road/track use cars: www.kwecars.com/wp-content/uploads/2013/11/PA260003-XL.jpg
Yet another view of the same thing here: www.jaguarforums.com/forum/xj6-xj12-series-i-ii-iii-16/poly-bushings-my-radius-arms-polybush-superpro-120164/#post998260 And an entirely different take on the same basic concept here: forums.jag-lovers.com/t/xj-s-irs-cage-motion-rear-wheel-steering/334682/17
Wow!!! That set-up is massive. It looks like they sacrificed another control arm for the forward pivot and used the rubber bushing only for isolation and not rotation.
Interesting. They use the stock trailing arm as well. Group 44 eliminated them altogether. When we raced the E Type at Monterey in 2011, the group 44 cars were on display and I took my video camera and waved it around underneath the rear end of the first XJS they ran. Their set-up was much lighter than mine and they won two a Trans-Am championships with it. But street use is more rigorous than track use in the long run.
The word that comes to mind is the rubber mounts provide "compliance." Not lecturing here just sharing a word that took a few days of reaching deep into the dusty recesses of my mind before finally popping up.
This guy is wise and correctly details a smart street setup and a race setup.
Great work
Thanks Bob for the explanation. I was fuzzy after the first introduction, but this cleared it up the bulk of the questions.
So I continued watching video and then saw the word "compliance" mentioned. I'll hush up now...lol Great video!
Wasnt that flexing that the cage does when the swing arm goes up and down a form of passive 4 wheel steering? Its not a bug its a feature! I can see why you would want to get rid of it for racing though.
That's what bump steer is. Not a problem on the street.
As you suggest, Lister used precisely that, a rubber bush where your forward rose joint is for their 7 liter road/track use cars: www.kwecars.com/wp-content/uploads/2013/11/PA260003-XL.jpg
Yet another view of the same thing here:
www.jaguarforums.com/forum/xj6-xj12-series-i-ii-iii-16/poly-bushings-my-radius-arms-polybush-superpro-120164/#post998260
And an entirely different take on the same basic concept here:
forums.jag-lovers.com/t/xj-s-irs-cage-motion-rear-wheel-steering/334682/17
Wow!!! That set-up is massive. It looks like they sacrificed another control arm for the forward pivot and used the rubber bushing only for isolation and not rotation.
Interesting. They use the stock trailing arm as well. Group 44 eliminated them altogether. When we raced the E Type at Monterey in 2011, the group 44 cars were on display and I took my video camera and waved it around underneath the rear end of the first XJS they ran. Their set-up was much lighter than mine and they won two a Trans-Am championships with it. But street use is more rigorous than track use in the long run.
Thanks for the links!
@@ferrariguy8278 Thank you Paul!
The word that comes to mind is the rubber mounts provide "compliance." Not lecturing here just sharing a word that took a few days of reaching deep into the dusty recesses of my mind before finally popping up.
How would this setup ruin the IRS for street driving?
Very increased NVH due to the rigid subframe mount directly to the chassis and spherical bearings.
“NVH”?