Alignment settings for street/track use - Page 22 - RX8Club.com



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Old 09-08-2017, 07:05 PM   #526
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Quote:
Originally Posted by Steve Dallas View Post
OK. I didn't realize that thread was talking about the lower upright. I was thinking the LCA bushings, but looking at how the LCA bushings are oriented, offset bushings wouldn't work, so the upright is the only candidate.

If I found the right part number on MMD's web site, they do show to be NLA. BUT... Ryan produced a pair from his mailbox Friday afternoon and said he got them from MMD, so...

(Maybe I should run in there and buy them Saturday, when I am back at the track.)

I'll ask him what he knows about it.

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Originally Posted by Steve Dallas View Post


He emailed me the part number this afternoon. It is 0000-04-5407. That part comes up for the MX-5, but the diameter is the same, so it works for RX-8s.


These aren't LCA bushings. They're metal offset bushings that replace the lower metal OE NC upright insert bushing where the LCA ball joint attaches to it. They're straight drilled for the tapered ball joint spindle too. I suppose it'll just center on it's own and not move around when tightened down. I'm not at the shop and can't recall if the RX8 front upright has the same ball joint attachment bushing or not. I know the rear uprights have bushings. Remains to be seen if they can be used or not.








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Last edited by TeamRX8; 09-09-2017 at 07:19 AM.
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Old 09-10-2017, 11:04 PM   #527
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Ok, well the RX8 upright does have a metal bushing insert for the LCA ball joint connection. Without actually pressing the bushing out of the upright I can't be 100% sure, but it appears to be the same size. However, there is one difference/hang up. It turns out the offset hole in the bushing is tapered to match the tapered LCA ball joint stud. I just couldn't tell the difference without a caliper to measure them.

When I pushed the MX5 offset bushing up on the RX8 ball joint stud it had the proper taper, but stopped short of fulling seating by 3/16" - 1/4 " of the stud length. The only reason I can see this ocurring is if the RX8 LCA ball joint stud is a larger diameter overall than the MX5 ball joint stud.

So my initial assessment is that these won't work on an RX8 without modification. They also might not be an allowable modification for some racing classes. Great idea conceptually though.
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Old 09-14-2017, 05:04 AM   #528
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So my latest settings are based on consideration of lots of feedback from the folks here on the forums and other folks at the track.


FRONT
13.5" ride height
-2.7 camber
Maximum caster
Zero toe


REAR
13.5" ride height
-2.3 camber
+1/16" total toe (1/32" per side)


Pyronometer indicates these are good settings for street tires and 100TW R-comps, but Hoosiers may need a smidge more camber (-3.0 / -2.5 ?). I like the balance of the car with that camber stagger and stock sways and 10k/7k springs. Very neutral.
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Old 09-20-2017, 10:21 AM   #529
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and just FYI that Mazdatrix still has some of the Drop Engineering delrin front UCA bushing kits in stock

Cart Price Check Part:B-RX8-03UCA
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Old 09-21-2017, 11:37 AM   #530
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Quote:
Originally Posted by hufflepuff View Post
So my latest settings are based on consideration of lots of feedback from the folks here on the forums and other folks at the track.


FRONT
13.5" ride height
-2.7 camber
Maximum caster
Zero toe


REAR
13.5" ride height
-2.3 camber
+1/16" total toe (1/32" per side)


Pyronometer indicates these are good settings for street tires and 100TW R-comps, but Hoosiers may need a smidge more camber (-3.0 / -2.5 ?). I like the balance of the car with that camber stagger and stock sways and 10k/7k springs. Very neutral.
Looks really good. I wonder if you mean minimum caster?
I've actually recently increased caster as I prefer it that way, at a similar ride height and toe, but not able to get that amount of camber in both front wheels (even if I went with minimum caster).

FRONT
13.5" ride height
-2.1L/-2.5R camber
-7.5 caster
Zero toe

REAR
13.5" ride height
-2.0L/2.1R camber
0.11 degrees total toe in (~0.06 degrees per side)
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Old 09-21-2017, 11:38 AM   #531
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Originally Posted by TeamRX8 View Post
and just FYI that Mazdatrix still has some of the Drop Engineering delrin front UCA bushing kits in stock

Cart Price Check Part:B-RX8-03UCA
Thanks... I assume these are straight, so no change to camber right?

Last edited by blu3dragon; 09-21-2017 at 11:40 AM.
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Old 09-21-2017, 11:43 AM   #532
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Originally Posted by blu3dragon View Post
Looks really good. I wonder if you mean minimum caster?
I've actually recently increased caster as I prefer it that way, at a similar ride height and toe, but not able to get that amount of camber in both front wheels (even if I went with minimum caster).

FRONT
13.5" ride height
-2.1L/-2.5R camber
-7.5 caster
Zero toe

REAR
13.5" ride height
-2.0L/2.1R camber
0.11 degrees total toe in (~0.06 degrees per side)
I'm running the maximum possible caster that allowed an even value side to side. I like the steering feel.
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Old 09-21-2017, 05:07 PM   #533
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Originally Posted by blu3dragon View Post
Thanks... I assume these are straight, so no change to camber right?
That's correct, I have a shop that will modify them to camber offset, but it costs as much as the bushing set. The design is superior to polyurethane though, very low stiction and no fore/aft or flexure movement at all.

I'm not sold on high camber settings. What feels good and what goes faster are not always mutual.


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