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View Full Version : UMI G-Body Upper A-Arms w/ 1/2" Taller Ball Joints & Camber Curve Data



UMI Performance
11-15-2011, 02:09 PM
UMI Performance Upper A-Arms w/ ½” taller ball joints for 1978-1988 GM G-Body
P/N 3033-2
$439.99/set

UMI Performance is pleased to announce the availability of ½” taller heavy-duty ball joints loaded into our popular P/N 3033 upper a-arms. P/N 3033-2 a-arms combine the benefit of additional caster with increased negative camber potential throughout the suspension travel. The relocated ball joint plate offers up to six degrees positive caster without excessive shimming while the ½” taller ball joint creates up to one additional degree negative camber at full bump travel. Expect improved steering feel and an overall increase in lateral grip. Features include greaseable, low deflection UMI designed and manufactured Delrin bushings, chromoly cross shafts and polyurethane bump stops. These jig built DOM a-arms are supplied with a durable gloss red or black powder coat finish which guarantees your performance parts stay beautiful on your street car, drag car or Pro touring machine. Crafted with pride in Philipsburg, PA - USA.

Website Link Here- P/N 3033-2 (http://www.umiperformance.com/catalog/index.php?main_page=product_info&cPath=8_59_273&products_id=610)



https://static1.pt-content.com/images/pt/2011/11/30332a_LRG-1.jpg


The UMI upper a-arm with 1/2" taller ball joint...

...more than doubles the camber gain at 2.5" bump travel
...starts the camber gain during turn-in more quickly than stock
...has a linear camber tendency which improves camber performance on lightly loaded inside tire during cornering
...gives real handling improvement with no adjustment required to other parts of suspension (i.e. bumpsteer)
...gives the effect of a 1/2" taller spindle in an easy bolt-on part
...is a good building block for your Auto-x, street, or Pro-Tour suspension system

https://static1.pt-content.com/images/noimg.gif

exwestracer
11-15-2011, 02:12 PM
Glad you guys included the bump stops. Looks like a nice piece, and does what it's supposed to.

Bryce
11-15-2011, 02:53 PM
I like it when suspension companies post the resulting geometry! way to go UMI!

SLO_Z28
11-15-2011, 07:44 PM
I like it when suspension companies post the resulting geometry! way to go UMI!

https://static1.pt-content.com/images/pt/2011/11/th_agree-1.gif

I like that you guys used Delrin bushing that don't bind like the Poly ones do.

charlief1
11-15-2011, 08:27 PM
VEry nice. Glad to see a company that is doing testing on their parts instead of just saying they sell the best.:)

UMI Performance
11-16-2011, 10:44 AM
Thanks everyone. We will continue to supply data like this as we have it. We have a few other projects we are working on now.

The Delrin bushings are a very nice option and come standard in all our A-Arms (not an option that cost more). All Delrin bushings are manufactured by UMI as well :usa:

charlief1
11-16-2011, 11:09 AM
Just wondering if you're going to put a longer ball joint in the lower and see what it does then Ryan. That would be an interesting comparison to see what the benifits are, if any.:)

UMI Tech
11-16-2011, 01:19 PM
Hey Charlie. The next step will be to check the bumpsteer with the stock upper, then the UMI + 1/2" upper (they should be the same or at least very similar). Then check the camber curve with a taller lower ball joint then check bumpsteer again. Then fix the bumpsteer. That would give us the effect of a 1" taller spindle.

Lots of fun projects here at UMI.

ramey

charlief1
11-16-2011, 04:12 PM
Wish you guys were a little closer Ryan. I think helping on this would be really informative. I have a few interesting theories which I think your testing will prove out for me.

UMI Performance
11-17-2011, 04:17 PM
We will have some results posted shortly of both the G-Body and A-Body. So stay tuned. Thanks for looking

mc84_zz4
11-17-2011, 07:16 PM
Nice job guys! Really looking forward to later updates.
:cheers:

carguykeith
11-23-2011, 11:04 AM
I assume you'd sell these new uppers for tall balljoint without them installed right? I'm running circle track arms with PPM tall uppers now, but would like to pull some more camber out on track days and already have a healthy shim stack. Also going to lower an inch and my guess is that it will require more shims or a differnt arm too.

UMI Tech
11-23-2011, 11:53 AM
Hey Keith. We do indeed sell unloaded arms under P/N 3033: http://www.umiperformance.com/catalog/index.php?main_page=product_info&cPath=8_59_273&products_id=398

Happy Thanksgiving!

ramey