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Old 04-29-2014, 11:55 PM   #1
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Default 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?



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



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).
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BeatRush PPF brace: Idea-beatrush_miata_ppf.jpg   BeatRush PPF brace: Idea-ppfbrace.png  
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Old 04-30-2014, 01:41 AM   #2
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It would be way easier to just use '4-bar' bushings at the subframe attachment points.

--Ferdi
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Old 04-30-2014, 03:09 AM   #3
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That's another option I was thinking about, can't seem to find an appropriate one though..
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Old 04-30-2014, 03:52 AM   #4
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Were you thinking of modifying the Beatrush brace or making a whole new one?

--Ferdi
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Old 04-30-2014, 03:58 AM   #5
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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?
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Old 04-30-2014, 04:08 AM   #6
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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
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Old 05-01-2014, 08:37 PM   #7
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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
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