Does anyone still sell delrin bushings? Especially an offset upper control arm set to gain more camber adjustability?
I have stretched out multiple powerflex purple bushings, trying their "race" version now however ultimately delrin is optimal.

Cheers

 

Don't know of any FD specific providers but... These guys just released a similar bushing for Spec Miata. Maybe contact them and see if they can do one for the FD?
https://www.racebushings.com/product...r-mazda-miata/

 

As another optionHard Race makes push in spherical bearings for FD.

IDK if that will beat up your chassis more than you want going over thr rumblies and off the edge of track.

 

Hardrace has a full camber adjustable upper control arm available. They make them with hardened rubber and spherical so you have a choice. I have a set on my personal car and I like them.

https://hardraceshop.com/products/ha...-rx-7-fd-91-02

And I am just now seeing they released a new version

https://hardraceshop.com/products/ha...ball-2pcs-set#

 

I emailed racebushings and they are interested in creating FD products. They would need a group buy to kickstart it however.
I do believe spherical bushings may be too harsh for the average street/track FD. Those hardraceshop arms are nice however a replacement bushing would be ideal to keep the stock arms. I am just nervous about welded aftermarket arms, just me.

 

I wonder how the bushing size on the FD upper arms compares to the upper arms in the NC MX5 and RX8. Those chassis also need more camber.

 

Find a friend with a lathe? Delrin is cake to machine.

 

The Hardrace ones look nice, but the cars already have camber adjustment. Maybe these are for the ridiculous amount of camber stanced look?

 

That ^^^ Find a local small machine shop who can work this kind of job in between larger ones. They usually are happy to do so especially if you aren't in a tearing rush and they can fill some dead time in the next week or two.

I had some custom brackets made for a power steering add-on to my old Land-Rover and iirc the guy charged me around $100 to machine the main bracket plus a couple of reinforcing ears (material and welding was separate)

 

if one looked hard enough someone has probably even posted drawings or measurements.

 

This is a race car / heavy track only kinda mod. It's difficult to get around -3* or more camber on the front of the FD - and the RX8, MX5, NA/NB Miata.

 

not at all actually... i didn't ask when my car was on the alignment rack but I'm pretty sure they only have a 6* swing. 3+ and 3-. so you can install them on a stock height car and still maintain factory stance.

 

Putting eccentric bushes in is appealing for simplicity - and superpro sells urethane ones - which I assume have the same longevity as powerflex, really only addresses camber though. Short of making/buying arms, modification to the subframes is another route you might consider.....and improve castor range at the same time.

If still keen on the original idea, there's a few other plastics that cost a little more than acetal and might perform marginally better.

 

Does an FD track car actually need -3 degrees static on the front? Other than for tire fitment?

If all else fails, they still make eccentric pillowball bushings in Japan... A full set is $$$$, though.

 

YMMV as they say. Pyrometer is your friend to determine that.
More than 3 is definitely needed for NA and NB Miatas. We generally run -3.5*. Some more; some less.
The scenarios I'm referring to are not for tire fitment.

 

Hmm. Fair enough. I think I have around -2 in the front, and my pyrometer readings seem reasonable, though honestly they probably aren't that reliable since I am the one taking them! Haha.

In the rear I've probably only got -1 or -1.5, and it's clearly not enough, since the outsides of the tires are turning a different color than the rest.

Not being street legal makes aligning my car a massive hassle, unfortunately... Don't even get me started on corner weighting!

 

Do a search for Kevin Doe offset bushings. Kevin made a drawing of an offset upper control arm bushings for an FD and he posted it to this forum. I used his drawings and I had a shop fabricated some bushings for me. With this offset bushing, I can get up to -3.7 or more of camber in the front.

 

Yeah, you definitely need a buddy in order to take more accurate tire temps.

I feel your pain on alignment and cb. I wound up getting my own equipment used a few years ago. Paid for itself quickly.