Question 911 front strut steering knuckle, bump steer Options

[Krieger]

I know there are shops out there that raise the spindle on bilstein struts then heat and bend the steering knuckle down to help with bump steer. I plan on lowering the front suspension about 1.5" by using the adjuster. I have boge struts and want to know if anyone has done just the heating and bending of the steering knuckle, does it work to counteract bump steer, is it hard to do acurately?

[charliew]

Ok the simple explanation is as Chris and Andy's nice art work states is that:
The tierod needs to be exactly the same length from it's inner ball joint to the end at the spindle arm as the a-arm from the inner bushings to the balljoint so that they stay parallel and swing in the exact same arc.
If the steering rack is two inches higher and three inches further rearward from the inner a-arm bushings the spindle arm end for the tierod needs to be 2 inches above the balljoint and three inches rearward of it. Actually a straight line at rest between the tierod ends. If this ain't so you gotta set it at ride heigth and limit the travel of the suspension so the bump steer is as little as you can get it. The limited travel is what makes it not keep the wheels on the ground under normal use. It seems that track cars may not need the extral travel that you need on a street car.

How much you lower the car seems to be relative to when the tire will touch the fender lip when it is turned and bottomed out.

If you are trying to keep the full motion of a strut insert on a lowered fat front tired 914, Can you make a piece that is the same length as a bottomed strut insert and put it in the strut and use that as the starting place with your chosen front wheel to see where to put the rack and spindle in relation to the strut?

It seems that when you bend the tierod end of the spindle arm down it gets shorter and that will quicken steering but will change the relationship of the arcs.

If you guys know a place to get this info for the 914 please enlighten me, I'm sure I'm not the first dummy to study this.