Hello All you suspension Gurus,
UPDATE (1) 7/24 - Left Front alignment nut side cams had the little nubs worn off and were not rotating with the alignment bolt leading to inconsistent readings, I replaced the nut side cams and all seems well, I am working on the right side front now and think I may have a bent upper control arm (the bolt is bent by about 1 mm). I am going to compare the upper arm and spindle to my spares. How common is it to bend the lower? I have lower control arm spares as well but not sure the spare is good.
UPDATE (2) 7/25 - Confirmed bent RF upper control arm, slightly bent upper control arm bolt, spindle seems to be OK; the bearings roll free and measurements and angles match my spare. I will now be checking the lower A arm.
UPDATE (3) 7/26 - Lower 'A' arms OK, I don't have jigs, but do have several spares and anything that did not match the others was considered bent, I also did a 'mirror' comparison of left to right pieces and Dave's 'feel test' from another thread. Both subframes are checked and match my spares. I also found a lengthy thread where Dave and Keith (and others) were helping Flyintgr and found a lot of good info there. As well I also realized there is a Version 2 of Jim's suspension set up.
Proposed set up (or as close as I can get to it), is this a good novice, general set-up?:
toe - total toe out 1/8 as measured at 21" on the toe plate
toe - total toe in 1/16 as measured at 21" on the toe plate
Fatcats and offset bushings will be installed over the winter, but I am on a mission to learn how to set up in it's current state prior to 8/5 hip surgery.
>>>What have I overlooked or what are your suggestions at this point?
***You have all been very helpful, I cannot imagine any other sport where your competitors are so willing to help!
After being hit in my last race I am using this opportunity to give my suspension a thorough once over. It's a '99 SM, I have the car on scales at 50%, front shock travel is 5/8 front and rear is 3/4. No Fatcat mounts. Experience wise, I am a novice.
I have Dave's book and used it, I have read Jim's upload as well and used that to get the car 'square' at 2.8Â°. I have a few Q's about set up and am looking for good base line numbers.
I have replaced any bent parts with know good ones, here's my dilemma and questions...
>> The most camber in the rear I can get equally is about 2.8Â°, the least camber I can get in the front equally is 2.8Â°, this is all at 0 toe. RF caster is 8.5 Â°, and LF caster is 5.5Â°. (I maxed the RF caster to get to 2.8Â°). The numbers are correct, my neighbor is an ex NASCAR crew chief and he assisted. Jim's upload says go for 2Â° on all corners, other conventional wisdom says give the front +.5Â° of camber over the rear. At the track I see many Miata with a lot more than 2Â° camber all around and more camber in front than rear.
Given these numbers, can anyone recommend a course of action to set up my car. I was thinking 2.7Â° rear w/ 1/16 toe in per side, and front at 3.2Â° camber w/ 1/16 toe out per side and 4.5Â°caster and leave the ride height as-is. Rear sway set to full soft.
or.. do I max out camber and call it good?
Another option is to install a spare set of front spindles or get the offset bushings to reduce front (or increase rear camber) but I would rather not if it is not needed.
I just need a good baseline setting so I can improve myself and get back to a neutral setting if needed. I doubt I will be making on-track adjustments.