BeatRush PPF brace: Idea
 

I just read the review on mnet for this thing, sounds like it makes the rear end extremely stable and planted. So I had a thought: If the brace creates lots of NVH, could we make the two legs from the PPF bolts two-part and have a chunk of poly between each to absorb the NVH like shock absorbers?

https://www.miataturbo.net/attachmen...ine=1398826557

Here's an idea I was throwing around in my head, since poly bushings are so damn rigid, you make a cup and sleeve type setup and slide the diff end into form-fit poly sleeves to absorb the NVH.

Of course, I made this as gay as I could :makeout: :dancegay:

https://www.miataturbo.net/attachmen...ine=1398826557

The problem many might see is if it shifts left/right or even forward, what's to stop it from pulling out? I was thinking it could also bolt to the bolts adjacent to the PPF attachment bolts as well, assuming NVH wasn't too harsh (or worse than the original design).

It would be way easier to just use '4-bar' bushings at the subframe attachment points.

--Ferdi

That's another option I was thinking about, can't seem to find an appropriate one though..

Were you thinking of modifying the Beatrush brace or making a whole new one?

--Ferdi

A whole new one originally, I like your idea better though. I'm just trying to figure out what size bushings I would need that would fit a 14mm bolt and if you can't get them thin enough, grind off the extra thickness..

The top one under 4-bar shows what seems close. Anyone have one of these braces on hand that can caliper the inside diameter of the bolt mounting area (and take a picture if you could) and thickness?

I don't think the bolts at the subframe mount are 14mm, I think they're 12mm. I, too, was thinking you were making a whole new one, so size wasn't that important. But, I've modified these 4-bar bushings on a lathe before.

Another option is to make some bushings out of delrin, but that probably wont reduce NVH by much, if at all.

--Ferdi

The subframe attachment points already have some sort of non-metallic bushing.

Look at one of the close-up pics here: Beatrush Rear P.P.F. Bar For Miata MX5 MX-5 ALL YEARS JDM Roadster : REV9 Autosport