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The Miata Bushing MEGAthread: Heirarchy, DIY delrin dimensions, info and discussion

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The Miata Bushing MEGAthread: Heirarchy, DIY delrin dimensions, info and discussion

 
Old 05-08-2016, 11:49 PM
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Originally Posted by Arca_ex View Post
Hey speak for yourself mine is only like 86dB at 50ft wide open throttle lol.
Originally Posted by Arca_ex View Post
my car is a purpose built race car and NVH is already abysmal
o'rly?
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Old 05-09-2016, 12:00 AM
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Originally Posted by aidandj View Post
Hopefully thumpetto will give us a good idea of them in a fully loaded car.
I'll try my best!

Fully loaded it is!!! 2445 pounds without the hardtop, or rollbar, or supercharger/piping, or driver Although, I have been talking with carbon miata...

I'm so jealous of the 2000 pound miatas out there
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Old 05-09-2016, 12:34 AM
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These will be going in with 10kg front and 6kg rear MCA XR with dampers set pretty stiff. And I use a bucket seat. So comfort isn't a huge concern for me, mind you I think the sparco sprint series is actually better than the factory seat for comfort 😕.
Besides, second car on the way for daily duties. Any one got comments on wear? Not that I'm worried. More curious what to budget for for replacement.
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Old 05-09-2016, 01:50 AM
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Originally Posted by aidandj View Post
o'rly?
Yeah.

Vibration/Harshness is pretty bad but it's not anywhere near as loud and obnoxious as most Miata track cars.
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Old 05-16-2016, 01:02 PM
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My wife has said that I can have xidas once the car is running. The car is still running the OEM bushings from 1997. Should I upgrade to these fancy bushings at the same time since I'll have the car up on jackstands anyway? Also, how DIYable is this? I have hand tools, air tools but that's about it.

This is mostly a street car with occasional track.
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Old 05-16-2016, 01:04 PM
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You should upgrade bushings at the same time, there are a variety of good choices out on the market that will perform significantly better than your OEM rubbers.

A press is a godsend with delrin bushings, not sure I would try it without one.

Otherwise all you need is a 1/2 chuck corded drill, the right size drill bit for boring out the bushings, and a 1/4-28 tap.

I would not hesitate to run delrin bushings on a street car.

Last edited by aidandj; 05-16-2016 at 02:26 PM.
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Old 05-16-2016, 02:02 PM
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Originally Posted by aidandj View Post
You should upgrade bushings at the same time, there are a variety of good choices out on the market that will perform significantly better than your OEM rubbers.

A press is a godsend with delrin bushings, not sure I would try it without one.

Otherwise all you need is a 1/2 chuck corded drill and a 1/4-20 tap.

I would not hesitate to run delrin bushings on a street car.
1/4-28

And you will need a press
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Old 05-16-2016, 02:51 PM
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Well the wife handed me a pile of harbor freight coupons this morning, it must be a sign from god to buy a press.
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Old 05-16-2016, 03:01 PM
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Old 05-17-2016, 05:22 AM
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Originally Posted by aidandj View Post
A press is a godsend with delrin bushings, not sure I would try it without one.
Originally Posted by hi_im_sean View Post
And you will need a press
I did my SADFAB ones with a vice, easy peasy. YMMV.
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Old 05-20-2016, 02:55 PM
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I have a pretty big vice which looks like it could function in place of a press.

Does the sadfab Full Enchilada kit include everything one one would need to go from OEM to completely optimal?

Cut and paste from sadfab:
Full Enchilada
Delrin + LCA bronze + Spherical + LCA poly Kit
$610
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Old 05-20-2016, 03:10 PM
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Yes. A few tools will also be needed.

1/4-28 tap and matching drill bit.
1/2" chuck corded drill
7/8" drill bit.

Last edited by aidandj; 05-20-2016 at 03:38 PM.
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Old 05-20-2016, 04:43 PM
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Originally Posted by AlwaysBroken View Post
I have a pretty big vice which looks like it could function in place of a press.
I found my vice (6" wide jaws) to be faster and easier to install the Delrins, even though I have this guy to use:



Big pic, but the press won't fit in fewer pixels.
Attached Thumbnails The Miata Bushing MEGAthread: Heirarchy, DIY delrin dimensions, info and discussion-80-img_1143_2a8d438ef3c176751085c9c2b5248823ad47d9d7.jpg  
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Old 05-26-2016, 08:52 PM
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Quick question for you guys. How tight should the rear knuckle be against the lower delrin bushings? The bushings are pressed in all the way but the knuckle would not go on.

*This is after I realized that I had pressed one side in wrong by installing the bushings from the outside in instead of inside out. I was pressing in the other side and started thinking, "what the hell is retaining the bushing with this arrangement?" Yes, I went full retard*

After taking care of that little mishap I went to get the knuckle in and it was filing off the delrin from the face of the bushings. I took a block sander and shaved off some material from both sides. It went in without too much grief but it is still rather tight. You have to really manipulate the knuckle in order for it to move. How much stiction should this thing have? I stopped sanding it thinking it would wear in and of course since I can still take more material off but not put it back on. Duh!

BTW, I bought this to replace my Prothane kit. Which after three years, no maintenance, but only 12k miles or so, it did not bind or squeak or deteriorate. Maybe sub-tropical weather conditions are kind to polyurethane.

And thanks for taking the time to put this kit together. While my experience with poly was not negative, I can definitely see the new bushings being superior. And of course, having a thousand zerk fittings for maintenance will make them superior for longer.
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Old 05-26-2016, 09:20 PM
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Default The Miata Bushing MEGAthread: Heirarchy, DIY delrin dimensions, info and discussion

Having recently done my third install, Im noticing there is variation of up to a mm, in spacing between the bushing bores of the RLCA-O. I have recently relaxed the flange size a little because a few people, including me on 1 car, have had the issue you describe. The fix is to do exactly what you did, I used an 80 grit block on the last car i installed these in. They should be tight in any case, and they will wear in, so I wouldnt be to worried about the current level of stiction.

Edit- did you check for burs and weld blobs on the edge of the bushing bore where the flange seats? Every other rlca I've done needed some file work there.

Last edited by hi_im_sean; 05-26-2016 at 09:36 PM.
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Old 05-26-2016, 09:39 PM
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Yes the bushing bore edges were flat. Something tells me I took care of this when I swapped in poly many moons ago.
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Old 06-01-2016, 02:26 PM
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We are now a supporting vendor of Miataturbo! Contact us for any information about the bushing kits. We can help you figure out how to make your own, or build something for you if you don't have the means yourself.
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Old 06-19-2016, 08:26 PM
  #178  
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How tight should the inner steel bushings in the Energy urethanes be? I went to re-lube for the first time and had to drive the inner sleeve out with a sledge and steel pin. Cleaned out all the old lube, polished the steel sleeve to a mirror finish, lubed it and reinstalled. It still required a hammer and drift, but not quite as bad as removing. This normal, or can you guys finger press the sleeves in after re-lubing?
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Old 06-19-2016, 11:42 PM
  #179  
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Yes its normal, but not desirable. That issue is the basis of this thread, did you read it at all?
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Old 06-20-2016, 01:33 AM
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Ummm, I have now, and thanks for answering. The bronze over steel conversion kits -- did you ever start doing the exchange thing for the front bushings that needed drilling? Also, do you only sell the entire package, or can we buy piecemeal?
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