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Weighted Miata 6MT Shift Knob Mod

72934 Views 190 Replies 33 Participants Last post by  Teamspeedy
6
Before:

After:

I had the chance to test drive the NC shift knob earlier today. My throws are more confident, less effort and most noticeably...the downshifts from 5th to 4rth and from 3rd to 2nd, are more assuring (the stock knob seems "unsure" in feel when I engine brake, esp from sliding the shifter from 5th to 4rth notch...a feeling somewhat that it might go to 2nd). Essentially, throws overall are way smoother. Also, this solid aluminum/leather NC shift knob is more elegant and sportier in looks and feel in your hand (the buttery smooth semi-matte black leather blends very well to the leather steering wheel, etc and does not look "out of place" vs other shift knobs). It is also as I estimate, substantially 4-5X heavier than the cheaply light, hollow bodied, plastic stock shift knob.

Quality well Made in Japan (for $95, shipped to my door)..somewhat pricey for a shift knob, but well worth it. I am quite happy with this OEM mod. :)
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Guys, I noticed too that the "crunching" from 1st-2nd is nearly non-existent now, with this weighted NC knob. I tried to so some quick shifting without pausing (split sec in neutral) and I did not feel any crunchy sensation at all. Granted I did a few of those shifts when slowing down towards the garage earlier (it could be due to a hot syn transmission fluid)..however, I will do more observations on NC knob, by tomorrow.

But one thing is for sure..shifting is now effortless and smooth, as compared to the hollow, plastic light stock knob. Now, I just merely "flick" the shift knob using my index and middle finger with less force to slide it to the appropriate gear notch..and it goes in, the right and smooth way. The more I use this heavy alum/leather knob..the more I feel I made the right choice spending (the pricey) $95 dead presidents. :D
So ExB5, these knobs just unscrew off / screw on? That easy? How much effort? I'm wondering if with time one needs to be tightening them due to use.
So ExB5, these knobs just unscrew off / screw on? That easy? How much effort? I'm wondering if with time one needs to be tightening them due to use.
Yes Caliche...very straightforward in swapping (no need to read the 2 page included instructions). Counter clock unscrew the old, hollow plastic stock..clockwise screwing the NC knob = <1min. I tightened it to the max allowable and the shift pattern is precise..straight and true. This knob is elegant albeit sporty...is not out of place and coordinates very well to the black interior. Nice feel on your hands and the shifting...real sweet (compared to the cheaply light and hollow stock). :)
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Ah, the bushings...you beat me to it, Brandon. I was thinking of mentioning that mod as well earlier today.

JBR has these, albeit for the 2014 Sky-Activ M3 (I highly doubt it if these are any different to our M6 6MT shift assembly...you know, parts sharing). To replace the soft, rubber bushings for that responsive, improved shifts.

It's only $25/free shipping to your door.

"Details: JBR Solid Shifter Bushings replace the stock Mazda rubber grommets that hold the shifter cage to the floor board. The JBR Solid Shifter Bushings create more responsive shifts in your Mazda. Having solid spacers removes the sloppy feeling and greatly improves shifting accuracy and your driving experience.

Includes:Solid Shifter Base Bushings
NO CEL Guarantee
Installation instructions are available in our support section
Shipping is free in the US & our Hassle Free Lifetime Warranty is included"



Solid Shifter Bushings Mazda 3 2014+ [SKY-MZ3-SSB] - $25.00 : James Barone Racing, Custom Fabrication

Now if we have or anyone in the know to DIY dismantle the console to reach the shift assembly..we're golden. :)
Nice! Thanks, for the link @ExB5!

We have the FSM floating around now to help with the install.
Nice! Thanks, for the link @ExB5!

We have the FSM floating around now to help with the install.
You bet. :thumbup:

But wait...FSM?

You have that linky...
You bet. :thumbup:

But wait...FSM?

You have that linky...
Yep! Link

We can thank @Byakuya and @Atxyde for that one.
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I am seriously considering this. Could the extra weight cause issues over time?
I drove to work this morning using with my fingers at the base of the stock shifter. Doing that seem to improve how it finds the gates which surprised me though I wouldn't want to do that in traffic for long. With the new shifter being slightly lower and heaver, I can see it being similar. I am going to get one.
This will be next for me after the wheels. After grinding 2nd yesterday, I want this and the bushings.
Guys, you would be surprised how a simple and innocent as a weighted knob would do wonders to your 6MT.

See, I wasn't expecting too much from it at first (mod knobs on prior rides were not that heavy, more analogous in wt and material vis-a-vis origs)..but now, I cannot imagine how would I do without.

The hollow neck of the OEM GJ shift knob is one likely culprit for the "crunchy" vibration to resonate altroughout the whole knob...and to you rt hand. The weight and heft of this NC knob helps alot in engaging to the right gear gate. Btw, I did a few more swift 1st-2nd shifting yesterday and earlier today...all smooth and no crunchies. :)
Ok, so I got the knob. And it doesn't screw on quite as far as the stock one -- by about 1/2" or so.

Out come the digital calipers, measurements taken, and in the next few days I'm going to take a rod of brass I happen to have laying around, cut a piece off, chuck it in the lathe and turn me a nice spacer that will go between the bottom of the knob and the top of the boot. Shouldn't take more than an hour including drilling the center hole for the shaft.

It'll add a nice little brass accent to the shift lever; brass is pretty heavy as well so I'll gain a bit more mass, and it will look VERY custom-ish.

The only problem is that brass WILL tarnish and I have no real good way to lacquer it to prevent that from happening -- at least I don't THINK I do (might have to see if I can find some spray lacquer that will adhere to it.)

Pics when I'm done, I think it's going to look VERY classy.
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In for pics!

Oh, and feel free to make another one of those spacers for me. ;)
ROFL (on the spare)!

Got it turned; need a 10mm drill bit to drill the center hole before I cut it off.

Off to go get one.

This is gonna be purdy; the correct size, by the way, appears to be right around .270" plus or minus a bit. There's a surprising amount of movement (up or down) with one rotation on the knob, so you gotta be pretty much spot-on with the length or you're hosed.

Pics tonight or tomorrow.... whenever I get it finished.
I adjusted the boot and reconfigured the folds to limit the gap between the bottom chrome of shift knob and top of boot. When I push the knob down, it stops to the top of boot.

But frankly, the gap never really bothered me (to be too anal about it). If fact, the bright side..it prevents my fingers from gripping or touching the top of boot, when I'm about to shift. If I want to get rid of it (the gap)..I'm thinking of slapping a good, grippy HD type round velcro (with a hole for the shift lever rod to pass through) to pull the boot taut (at every boot movement). One side, on top of boot..the other, just below the chrome bottom trim.

Sidebar: I am REALLY loving and enjoying the :drive: now...with this weighted NC knob, the more often I use it. The much improved shifting makes me :D from ear to ear.
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NOW the shift knob installation is done.... :D

The OD of the bushing was cut to match the bottom of the tapered portion of the knob. I considered going ~.100" larger in diameter BUT then I would have had to machine a "cup" to fit the knob bottom and there would be the risk for snags and cuts; as it was I chamfered the corners a bit to take the edge off. It leaves just a bit of a side gap on the boot but there is no play in the bushing or boot with it installed. Looks very, very close to being factory.

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Not bad. Though your console looks grubby though. :lol:

Joking aside, won't that cut slice to the top boot (through time, due to repeated push to reverse, shifting)..
No. It is not any sharper than the factory plastic knob; I deburred the edges and polished the surfaces with 600 grit before cutting it off, then deburred the cut edge (although it is at the top inside the knob where it is not visible.) There is also no motion at all; the bushing does not move in any plane; the spindle is .400 (10mm) and the hole is .407, just large enough for the bushing to drop over it, and when the knob is installed it is held firmly in place.

If I cut another one (and I might) the only thing I would change would be to relieve the center section of the bottom (which is a bit tricky as you have to run the lathe with the tailstock removed; there is a significant risk of the workpiece binding and if it grabs while removing that material you're screwed) so as to allow the bushing itself to drop down over the plastic retention piece that the top of the boot is attached to. That's why the gap is there on the bottom; the bottom of the bushing itself is flat. I do not have a chuck with a large enough center section to allow a full-length feed-through of the workpiece which greatly reduces that risk while doing that sort of "bowl" cut on the face of the work.
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Wow, that's alot of work for that piece. Well, it does look good. Nice craftsmanship, ticker. Congrats. As long as you're happy with the overall shift knob mod results...that's what really matters.
Looks good either way, but the brass does give it a nice extra touch. I'll be picking one up after the wheels are on.

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