Raised Strut Spindle vs ERP Bump Steer Kit, same cost which is more useful? Options

[kdfoust]

So I'm already hemoraging money all over the suspension bits of my car. Why stop the bleeding so soon when there are so many parts to buy... (IMG:style_emoticons/default/happy11.gif)

When the car goes back together I'm lowering it as far as practical for an AX/street ride (my driveway may be the ultimate constraint). I've already experienced the near complete elimination of bump steer by installing washers under the steering rack so I never want to put up with bump steer again. So I'm looking at my options and see two. The first is to install a ERP bump steer kit (hit page down a couple of times to find it) so I can dial out the bump steer no matter where the ride height is set. The second option is to go to the Tangerine racing raised strut spindleswhich appear, looking at the digipic, to have the control arm bent to a corrected position to eliminate bump steer while resetting the ride height via the relocated spindle. I suppose the raised spindle also has the advantage of not using any of your suspension travel to achieve the lower chassis height.

Whata ya think? The price is a wash. Anybody done both or one or the other to provide and comparison/comments? Oh this all assumes that the dreaded bump steer will show up with a vengance as I crank the car lower...

Thanks,
Kevin

[kdfoust]

That answer is why this board is the best thing going...makes a lot of sense!

The front RC can be found by (this is a question): projecting a line from the inside edge of the front tire through the a-arm pivot axis? The intersection formed by lines projected in similar fashion from each front tire->a-arm defines the front RC?

The rear RC can be found by: ? The fact that the suspension pivots roughly perpendicular to the car CL makes rear roll center less intuitive to me. How does one define the rear RC?

With those two definitions I'll be happy to measure my car and put some data into the thread.

QUOTING from Hayden
"The migration of the RC height will be more than the ride height change - by some significant factor. This means that in bump (same as lowering) the distance between the height of the Center of Gravity (CofG) and the front RC will increase, making the kinetic roll stiffness softer."
That begins to explain shifts in a car's handling behavior; car understeers at low speeds then transitions to oversteer at higher speeds as the suspension gets compressed due to cornering/braking loads.

Good stuff.

Thanks,
Kevin