Supermiata Forged Front End Components
#41
I ordered some genuine r-pkg ball joints and put them on the car. I measured the bumpsteer both before and after, but only on one side. The measurement below is per side, not total.
Pertinent car info
Caveats... This was measured with a string alignment kit setup at ride height, ie at large displacements from ride height, the toe will be slightly under-reported since I'm not measuring across the total diameter of the wheel. Also, it's pretty tricky to do this accurately by yourself, but every point should be at least within 1mm of toe and 1mm of vertical travel...
I went back to standard after this measurement, and am now strongly contemplating an NB subframe swap before this car does a trackday at the 'Ring this coming May.... 20mm total bumpsteer would be pretty interesting during some parts of the track, especially the 140mph huge compression that is the Foxhole....
Pertinent car info
- Complete NA front suspension (subframe, knuckles etc)
- 1/2" garagestar rack spacers
- Bauer ELBJs (changing inner to outer pivot distance on the arm will slightly affect bumpsteer)
- Generic parts store standard NA tie rods and genuine r-pkg ball joints
- Only measured the range of travel I get for my ride height with my dampers (Xida race) - at 74mm compression the 195/50R15 tyre was scrubbing the top of the arch.
Caveats... This was measured with a string alignment kit setup at ride height, ie at large displacements from ride height, the toe will be slightly under-reported since I'm not measuring across the total diameter of the wheel. Also, it's pretty tricky to do this accurately by yourself, but every point should be at least within 1mm of toe and 1mm of vertical travel...
I went back to standard after this measurement, and am now strongly contemplating an NB subframe swap before this car does a trackday at the 'Ring this coming May.... 20mm total bumpsteer would be pretty interesting during some parts of the track, especially the 140mph huge compression that is the Foxhole....
#43
Cpt. Slow
iTrader: (25)
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 14,206
Total Cats: 1,139
I measured bump steer on an NA with v8r’s subframe, customer wanted rack spacers installed. Measured a little toe out with compression, put a 1/8” spacer in which made it worse. If anything I wanted less space. You might try the same.
Im 90% certain this was stock ‘90 knuckles, don’t remember if he had different outer tie rods.
Im 90% certain this was stock ‘90 knuckles, don’t remember if he had different outer tie rods.
#44
I measured bump steer on an NA with v8r’s subframe, customer wanted rack spacers installed. Measured a little toe out with compression, put a 1/8” spacer in which made it worse. If anything I wanted less space. You might try the same.
Im 90% certain this was stock ‘90 knuckles, don’t remember if he had different outer tie rods.
Im 90% certain this was stock ‘90 knuckles, don’t remember if he had different outer tie rods.
But overall, it would be more useful to the community to start a new thread with bumpsteer data.
__________________
Thread
Thread Starter
Forum
Replies
Last Post
MuchoBoosto
Suspension, Brakes, Drivetrain
10
02-13-2019 06:57 PM
bbundy
Suspension, Brakes, Drivetrain
76
01-07-2018 12:34 PM