usafstud

Hi,

I'm getting ready to install my coilover and wanted to purchase the supporting parts (front bump steer kit & axle spacers). If I already have a SPC upper camber kit, do I still need a roll center kit?

Thanks

thomsbrain

You don't need a front bump steer kit as the front doesn't have much bump steer to begin with and the OEM tie rod is already spherical.

You don't need a roll center adjuster unless you want to do that to try to limit front roll. Some roll center adjusters also include a static negative camber boost, but you probably won't need that either if you already have the SPC uppers.

s2000Junky

Agree, none of those things are really necessary to improve your handling or performance increase that stock wont do. Something that will though is a rear anti bump steer kit to dial out dynamic toe during rear suspension movement. If you want your car to handle more predictably and stay glued to the ground, this is the key, more so if you have an ap1. As far as bump steer spacers for under the steering rack, I am lowered 2" and really didn't perceive any different pre spacers, which surprised me a bit actually due to how swept the toe arms are without them, regardless it brought them closer to parallel and felt was appropriate to reduce the severe angle, if nothing else to help take the lateral loads better to increase their lifespan. So I did them.

usafstud

I have a AP1 an I'm putting on my ohlins. Usage of car will be 50% track duty. So just stick with my SPC camber kit and purchase/install rear bump steer kit and axle spacer?

s2000Junky

Well, you wont need an upper spc camber kit for the rear, because you can get more then enough negative camber then you will need -4+ The front I get -2.5 maxed out with stock adjusters at 13" wheel to hub/approx. 1.8" drop. So you may want the kit for the front if you plan on wanting more front camber then I have. But if its still a street car like mine, that sees some track days, you probably don't want more then -2.5 camber all around or you are going to be flipping tires and or re aligning the car every time you set up for a track day and then get back on the street. The rear bump steer kit is a great move.

Just because you lower the car doesn't mean you need axle spacers right now, these are not a preventative measure. They just solve the inevitable vibration from wear and tear by pulling the spider roller bearings out of the worn cup path. Lowering the car does this to a degree as well. If you plan on keeping the car for a wile and putting a lot of miles on it, you will need them eventually anyway, so up to you if you want to get them now or wait to see if you have any vibration after lowering, chances are you wont if the cups are currently in good shape/lower miles.

thomsbrain

It's only a little more work to just flip your CV cups from one side to the other, and that works just as well as the spacers, without needing to buy parts or add weight.

s2000Junky

That works too, although its a lot more work and messy. Assuming you are smart and get the 2 piece spacers for a 15min job rather then the single piece where you have to remove ball joints and shit. Eventually you will still need the spacers though if you plan on getting the full mileage out of the cups/axles. Just depends on which option you feel like doing first. Eventually you will employ all the methods. The spacers weigh in grams if even an OZ. Not even worth a consideration in my opinion.

thomsbrain

No ball joints for the CV swap, just unbolt the upper arm from the body and lean the hub outward. But yes, the grease is messy (stinky, too).

s2000Junky

Well we all have our preferred method, but point is, its more work! and yes I hate dealing with that greasy mess!

bgoetz

The key to the rear bump steer is setting it up, which involves a gauge and knowledge