baileyman wrote:Determined after much head scratching and wooden mockup modeling that neutral bumpsteer for a TTR setup was with the steering rod sloping 11 degrees down. Just under 1/2" of spacers under the rack would give that figure. Not having that, the full half inch gave nearly the same result. Then, thinking what the tire patch is doing in bump is more important than in droop, I moved the neutral point up another 1/8" of spacers, 10 degrees down. On measuring toe through full bump, it seems pretty flat in the range. So this will be my initial setting.
sounds quite a bit, I recall for my S4 it was less than 1/4" (possibly even closer to 1/8") but all cars are a bit different on a sensitive issue like that steering rack holder plate I guess... I checked the actual bump steer using a laser pointer attached to the hub which I would take up and down around the operating point by a hydraulic jack, and I recall the sensitivity of shim thickness was quite high (had to make specific thickness shims combination to get to the sweet spot, which was within a few tenth of a mm), but was very pleased with the outcome.