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Thread: P11 Auto-X Setup help

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Posts: 171-180 of 220
2017-03-16 13:19:55
Oh man that's awesome! So your goal is to stretch the LCA out more for more negative camber? Only downside to that is increased KPI & scrub radius, but with your 255 tires you might actually benefit from increased KPI and might reduce the positive scrub.
2017-03-19 21:45:58
I will still plan on a "stock" length but use the adjustment to correct any camber difference left to right. Lowering the control arm with the RCA will increase the track width somewhat. My motor had some rocker arms fail so I am now in the middle of sorting that out as well so progress with these arms will be a tad slow and results even slower until the motor is fixed
2017-04-03 14:06:46
All welded up and painted. Just need to fit the OEM bushings and drill out the hub to fit 3/4" bolt. Cant wait to get the car running on these!
Should firm up and reduce the body roll. Will be lowering the car a bit more as well to take advantage of the corrected roll centre.

Last edited by cayman_primera on 2017-04-03 at 15-40-04.
2017-04-03 15:58:49
Good job on those, that looks awesome! So I've been thinking about doing the same with something like offset bushings. From what I'm seeing though, if you increase neg camber this way, you loose a good amount of caster.

What's your caster like right now?
2017-04-03 18:16:50
Yes you would lose caster by dialing in more neg. camber from the LCA. IMy caster should be stockish as I ahvent changed anything that would affect it other than lowering the car. The good news is that at stock length these should add a bit more camber gain as the suspension travels up. Because the LCA will be at a downward angle pointing towards the wheel and the UCA will be at a upper angle pointing up towards the wheel.

So the UCA will be pulling at the same time the LCA is pushing out. I will try and put these on with out the shock and video the compression. would be cool to see the difference.
2017-04-04 03:30:45
I would be curious to see how much camber gain and caster loss you experience, sadly that's really hard to measure at home. Miata's have adjustable front and rear LCA arms via camed bolts:

Basically turning the front bushing changes caster by 0.37*, and camber by 0.42*. While turning the rear bushing changed caster caster and 0.03* camber. So for them, you loose caster pretty quickly by messing with the front bushing. Though I wonder if you can mostly make it up by pushing the rear bushing out more (and you gain more track width!)

What kind of camber gain are you looking to get on compression? 1.5-2* per inch? My current one, with lowered rear UCA mounts, is 0.5* and it's not enough. I think 1 to 1.5* per inch, but I have more travel then you do.
Last edited by Vadim on 2017-04-04 at 03-32-40.
2017-04-04 21:56:14
My goal was to actually just correct the Roll Centre and did not give much thought to camber gain. By the looks of other RCA kits, increase neg. camber is a given since the arm is now more horizontal which will put it to it's furthest position in the range of motion. I will try and get something done tonight and take some more pics.
2017-04-05 13:35:49
I hope these images work, Test fitted the arms last night which took some time removing hub etc. and drilling them out for the 3/4" bolt. overall very happy with the results but have a few snags with the spacers and clearance(was expected) and will need to sort it out. The first pic is with minimal spacer and adding another 1/2" or so hits the rotor. so will need to grind down the arm to clear. The front heim bushing with spacers fits perfectly and should give good turning response. will try to keep the updates coming!

2017-04-05 13:43:39
Pics work good! Looks good .

I noticed you have heim endlinks, how are you connecting the top eye to the 3rd link? I thought about doing heim bottom mount (to the swaybar) and just a straight rod to the 3rd link.
2017-04-05 14:01:54
I made a a sort of U bracket that bolts to the original spot on the third link then the heim link connect to it.
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