Rear alignment - thrust measurement location
Thread Starter
Race Director
Joined: Apr 2011
Posts: 11,183
Likes: 3,335
From: North of Toronto - Ontario
I am always slightly different than the machine but consistently different by a little less than about 1/32 each time. When I was doing the front I kept moving the car out of the garage and back in. The caster on the passenger side wouldn't read the correct change even though it was on the greased pads I was using. I was using the laser off the rear to make sure the steering was centered. Each time I checked and to the bottom of my centers I could get the same distance basic ally within the width of the beam so like 15/16 plus or 1 minus
I re-did the shims yesterday moving only 1/32 on the passenger and 1/16 on the drivers buy I didn't put the wheels back on as I thought I should pull the pads while I have them off and give them the once over (Ibe got a slight squeak at parking lot speed that I think is a pad complaint ) tomorrow I'll put some goop on and put it back on and go around and try again to see where it is.
If I'm closer I can take it back to the machine for another baseline .
M
I re-did the shims yesterday moving only 1/32 on the passenger and 1/16 on the drivers buy I didn't put the wheels back on as I thought I should pull the pads while I have them off and give them the once over (Ibe got a slight squeak at parking lot speed that I think is a pad complaint ) tomorrow I'll put some goop on and put it back on and go around and try again to see where it is.
If I'm closer I can take it back to the machine for another baseline .
M
Last edited by Mooser; Jun 12, 2020 at 09:49 AM.
Thread Starter
Race Director
Joined: Apr 2011
Posts: 11,183
Likes: 3,335
From: North of Toronto - Ontario
frikken fracken fruckin
Got the rear toe at .156" in Good, happy with that
Both sides are at .5 ~ .6 deg camber with a full tank of fuel (drivers at .7 with my fat *** in the drivers seat)
Got the thrust at .156 off center (measured from each spindle is .3125 different) and I can move it from the drivers side to the passenger side but I can't make it get any better with the 1/32" shims I've got....
Now it's just pissing me off, I've got some stainless shim stock and tomorrow I'm making a couple of .01" shims
(I wonder how many years I drove it at 3/8"+ off center... 10??? 20???)
M
Got the rear toe at .156" in Good, happy with that
Both sides are at .5 ~ .6 deg camber with a full tank of fuel (drivers at .7 with my fat *** in the drivers seat)
Got the thrust at .156 off center (measured from each spindle is .3125 different) and I can move it from the drivers side to the passenger side but I can't make it get any better with the 1/32" shims I've got....
Now it's just pissing me off, I've got some stainless shim stock and tomorrow I'm making a couple of .01" shims
(I wonder how many years I drove it at 3/8"+ off center... 10??? 20???)
M
Thread Starter
Race Director
Joined: Apr 2011
Posts: 11,183
Likes: 3,335
From: North of Toronto - Ontario
Rear toe is .156 total
Thrust is .031" off center (a little less than 1/16" difference in reading from one side to the other)
Added a .006" shim to the one side but didn't bother re-checking, close enough for my old eyes. We'll see what the expensive machine say when it goes back in
For future reference, a 1/32" shim moved from one side of one arm to the other changes my readings at the front spindle by about .335 difference from one side to the other or about .167" from the centerline
M
Thrust is .031" off center (a little less than 1/16" difference in reading from one side to the other)
Added a .006" shim to the one side but didn't bother re-checking, close enough for my old eyes. We'll see what the expensive machine say when it goes back in
For future reference, a 1/32" shim moved from one side of one arm to the other changes my readings at the front spindle by about .335 difference from one side to the other or about .167" from the centerline
M
