Adjustable Upper Control Arms Yes or No (Page 1/1) Larryinkc JUN 29, 11:46 AM I have a pair of West Coast Fiero adjustable upper control arms and need some help with deciding if installing them is a good idea or not. Let me know what you think. THANKS in advance. olejoedad JUN 29, 01:28 PM Other than the bling factor, if you're not racing your car and fine tuning the alignment.....is there any point in it? You would likely need to remove the wheel for anyone to see them. In case of an accident ( even if it's not your fault), would your insurance coverage be denied? pmbrunelle JUN 29, 06:17 PM I think it's a good idea to fine-tune and figure out what you want. Once you know what you want, then it's probably ideal to build a fixed set of arms for service, that cannot become de-adjusted. fieroguru JUN 29, 10:13 PM Adjustable upper control arms are great, if you only look at what you are trying to accomplish with them. More caster, easy. More camber, easy. The challenge comes in what else changes with the suspension geometry as a result of the upper a-arm adjustment. Rock the knuckle back to dial in more caster - raises the outer tie rods vs the rack and upper/lower ball joints and makes bump steer worse. Shorten the a-arm to dial in more camber, now the relationship between the pivot points of the bushings, tie rods and ball joints change. This can cause bump steer as well as changes with the roll center. Knuckles, A-arms and steering rack all have to be designed or modified to work together. sleek fiero JUN 29, 11:13 PM Larry give them a try. You will never know whether they are anything you want unless you try them . I have the fiero store anti bump steer a arms on mine and I would not trade them for anything..Always there are new upgrades coming on and the only wa you will know if the are good is if someone tries them. sleek Wererabbit91 JUL 30, 12:41 PM quote Originally posted by fieroguru: Adjustable upper control arms are great, if you only look at what you are trying to accomplish with them. More caster, easy. More camber, easy. The challenge comes in what else changes with the suspension geometry as a result of the upper a-arm adjustment. Rock the knuckle back to dial in more caster - raises the outer tie rods vs the rack and upper/lower ball joints and makes bump steer worse. Shorten the a-arm to dial in more camber, now the relationship between the pivot points of the bushings, tie rods and ball joints change. This can cause bump steer as well as changes with the roll center. Knuckles, A-arms and steering rack all have to be designed or modified to work together. I agree with fieroguru and what olejoedad said. I recently installed a set of these on my Fiero. https://www.fiero.nl/forum/Forum1/HTML/100494.html My car is designed to be a track capable car and I wanted to be able to increase the camber and caster on it to correct for lowering it 1.5inches. So far I have settled on settings close to stock for the exact reasons Guru said. Driving around on Michigan roads the car is darty going over bumps and with no bushing material in the upper mounts now, you feel everything! Every joint, crack, or tar sealant strip. On nice smooth roads and tracks it handles great now, but normal roads the ride is significantly harsher. I'm okay with this for now, but I'm already thinking of how to redesign it with some bushing material between the upper arm and chassis. So I only recommend this modification for those who know exactly what they want to gain from it, and are ready to accept the increased ride harshness and resist the temptation to constantly try to fine tune them. I hope this helps!