Moonface Racing Roll Center Adjuster 350Z???
There's a reason why the Moonface parts are twice as much. They actually get the job done. The megan roll center adjusters are just expensive ball joints, they leave the same pivot point which means no change in geometry.
Originally Posted by kuah@splparts.com
The longer (or shorter) shank does not matter in this case because it will not alter the roll center. To change the roll center, the pivot point has to be moved relative to the upright/wheel hub. In other applications where the ball joint is on the control arm, having a longer or shorter shank will change the roll center because you are shifting the pivot relative to the upright. However in this application, the ball joint itself is pressed into the upright. Therefore to modify roll center, the pivot (ie. center of the spherical bearing) has to be pressed into a different spot within the upright. Based on the stock upright, to improve the roll center on a lowered car the ball joint would have to be sticking out under the bottom of the upright.
We have seen many "roll center" adjuster ball joints on the market for the 240SX that alter the physical angle of the lower arm, but do not actually modify roll center because the pivot point is not actually moved. MFR themselves sell some roll center adjuster ball joints for the 240SX that are that way, though their "race" version does in fact change the roll center. It is not clear, based on the product picture, whether these do alter the roll center on the 350Z/G35; I admit I am skeptical but I am open to the possibility that these do move the roll center a little. To demonstrate that these ball joints do change the roll center, you just need to press them into the upright, take a picture, compare that to a picture of the stock upright and show that the MFR pivot/ball is moved relative to the stock ball joint.
We have seen many "roll center" adjuster ball joints on the market for the 240SX that alter the physical angle of the lower arm, but do not actually modify roll center because the pivot point is not actually moved. MFR themselves sell some roll center adjuster ball joints for the 240SX that are that way, though their "race" version does in fact change the roll center. It is not clear, based on the product picture, whether these do alter the roll center on the 350Z/G35; I admit I am skeptical but I am open to the possibility that these do move the roll center a little. To demonstrate that these ball joints do change the roll center, you just need to press them into the upright, take a picture, compare that to a picture of the stock upright and show that the MFR pivot/ball is moved relative to the stock ball joint.
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