Alignment settings for street/track use - Page 21 - RX8Club.com



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Old 04-14-2017, 02:43 PM   #501
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hm, when I think more about it looks like whiteline UCA bushings would add more static negative camber, however as suspension compress eccentric sleeve rotates and you actually loose some camber unless you set its resting position so it achieves max negative camber as UCA moves to the upper most position when suspension is compressed - essentially helping you with camber gain under compression rather then with static camber. maybe installing them to help with camber gain is more preferred for track use as suspension is mostly compressed when you need most negative camber - in corners?

On the other side eccentric bushings with regular sleeve would keep the negative camber gain permanent in resting and in compressed suspension position, but then there is an issue of keeping them in place like you mentioned.

does this make any sense to you guys?

Last edited by Nadrealista; 04-14-2017 at 02:48 PM.
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Old 04-17-2017, 07:21 PM   #502
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Nadrealista - no clue on that, but I'm interested and trying to follow...
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Old 04-28-2017, 03:23 PM   #503
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Just came across this: https://propartsusa.com/blogs/how-to...l-arm-bushings

I searched their site, but did not find the bushings, have not tried calling...
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Old 04-29-2017, 01:13 PM   #504
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That post is from October 2016 - I didn't see anything on their website for an rx8 or a Miata. Haven't driven with my new alignment settings yet, but if i need further neg camber, will look into this - though I'm also trying to figure out what sort of nasa classing the car falls into before I do anything additional =P
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Old 05-08-2017, 06:06 PM   #505
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Quote:
Originally Posted by blu3dragon View Post
Just came across this: https://propartsusa.com/blogs/how-to...l-arm-bushings

I searched their site, but did not find the bushings, have not tried calling...
These are available from MazdaMotorsports only - ProParts is Mazdacomp's manufacturer.
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Old 05-10-2017, 01:14 PM   #506
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On the MM parts store page, click competiton parts link, change vehicle pull down menu to RX8 and then submit, it will pull up most of the RX8 comp parts and the bushings are listed there; about $86 as I recall

So cheaper than the speedsource and other company that duplicated the ss design, but not nearly as good IMO because they don't have the inner sleeve and also have to glued and pinned as a result. It will basically still work though. The earlier designs were't offset though. I had several sets modified to achieve the same thing with the offset in the sleeve though.


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Old 06-02-2017, 05:13 AM   #507
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Hey guys, I have the whiteline eccentric UCA bushings. The metal sleeve is wider than the poly bushing, and when you torque the upper bolt it is locked in place (pinched by the frame pieces). the poly bushing rotates around the static inner sleeve. This is nice because then you can torque the upper bolt at full droop and it does not bind like the stock bushing.
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Old 06-03-2017, 01:12 PM   #508
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Being able to torque it at full droop is not a good reason to make that choice. Just out of curiosity, what limits it from moving side-side as easily as it does about the axis?

The OE bushing has that characteristic, but it's accounted for in the overall suspension design and compressing the suspension to torque is no bfd. Poly moves around more than the OE bushing, especially in time, because the OE RX8 design is superior in minimizing defection even though it has softer rubber. Recommend in this order; new OE, sleeved Delrin, spherical. Poly should be avoided imo ... but 10+ years later it still gets ignored

If you cut or burn apart that same OE bushing you'll find that it actually has a lot of metal hidden inside to limit deflection. At least the non-sleeved delrin bushing is cheap enough that you can swap them out without a big hit. The general issue is that most people throw in poly etc and then just forget about ever doing anything more likely like they're a lifetime product. Not so ... same for spherical, most people let them get too sloppy due to the high replacement cost. Sleeved delrin have the longest service with good maintenance lubing if you can find or make them, but they only work in single axis rotation. Multi-axis rotation should stick with OE or spherical. Well that's my sermon for the day ...
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Old 06-19-2017, 03:04 PM   #509
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I spent some time with Ryan at MER Friday afternoon, once it was too hot to be on the track, and he showed me how they are getting extra camber in RX-8s. Apparently, MMD sells an aluminum offset bushing for the lower control arm upright that introduces at least 1.5* of negative camber, similarly to the way offset ball joints work in NA and NB Miatas. Installation is not trivial, and he quoted me around $500 for the job. He had an RX-8 up in the air with them installed, so I was able to check it out. Should work, and should be solid. I doubt I will do it at this point in my RX-8 ownership, but I wish I had known about it 3 years ago.

I'll ask him for the part number, if anyone is interested.
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Old 06-19-2017, 03:36 PM   #510
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Someone has said that those were no longer available.....So I'm not sure what's up with that

There was another thread that we were discussing this a month or so ago
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Old 06-19-2017, 03:54 PM   #511
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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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Old 06-19-2017, 03:57 PM   #512
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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.

I think there are a few people that would like them...so if you find out anything let us know
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Old 06-19-2017, 07:30 PM   #513
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I've modified several sets of the SpeedSource front UCA delrin bushings to be offset and could probably get you a set made. The bushings Motorsport sells now aren't as desirable imo as previously discussed earlier in the thread.
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Old 06-21-2017, 08:54 PM   #514
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Quote:
Originally Posted by dannobre View Post
I think there are a few people that would like them...so if you find out anything let us know
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.
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