18psi

iTrader: (76)

aww, that's just cute

Monk

iTrader: (3)

No, it uses the same transmission as the NC.

Leafy

iTrader: (1)

Which is similar to the rx8, miata 6 speed, brz, etc iirc.

Monk

iTrader: (3)

You're sorta correct, but to avoid confusion, and maximize our collective autism, I would like to add some clarification.
The first gen rx8 transmissions used the same case as the NB 6 speed.
Later RX8s (09-11) used an entirely different box, which is indeed similar to the NC 6 speed.
The NC 6 speed is nothing at all like the NB 6 speed.
I admittedly don't know much about the BRZ, but every image of the transmission I can find seems to be of the earlier, weaker AZ6, which is again similar to the NB, but not the NC.

Lokiel

Aisin 6-speed is shiite in the NB (MR long-angled SSK makes it almost bearable).
Aisin 6-speed in the NC has issues when cold getting into 2nd gear.
Aisin 6-speed in Toyburu has issues when cold getting into 2nd gear - I've heard that it may be as high as 25% of them have serious issues regarding this and personally know a guy who sold his within 9 months of ownership (I actually drove him to the dealer to pick up the car) because he had several close-calls in city traffic because of it, needing to use 3rd because 2nd wasn't accessible (all Toyota did was change his transmission fluid 3 times, different formula each time, to rectify the problem so he offloaded it at a loss and vowed NEVER to buy another Toyota again - unfortunately he then bought a VW Tiburon just before the VW scandal so considers himself cursed with regard to cars).

The Aisin 6-speed been around a long time now and is used by Mazda, Nissan, Toyota/Suburu and despite this it's STILL shiite.

I'm not surprised Mazda tried to make their own 6-speed for the ND, just wish it was made of sturdier stuff and hope they can iron out the bugs - there's no way I'm ever buying another car with an Aisin 6-speed unless I've got the $$$ for the BMW transplant.

Chilicharger665

iTrader: (2)

My Aisin in the Fiata is working just fine. It is clunky when cold. I will see if it will hold up to the much higher power soon enough.

sixshooter

iTrader: (12)

Shame there's no larger displacement bolt-in engine available in that family. That engine is a bored and stroked version of the 1986 Fiat Panda 750 or 800cc engine with a redesigned head. It's already the largest displacement in that engine family.

z31maniac

They seem to be breaking 4th around ~300-325wtq for the track guys. Less if you're an abusive driver.

Yes, it was 17 outside when I left for work today. Until the box is warm, it requires a double-clutch with a nice rev in neutral to get it to go into 2nd cold. Current trans fluid has approx 300 miles on it.

However, once warm, and using some rev's it's a pretty slick shifting transmission. It just doesn't really like being puttered around.

turbofan

iTrader: (1)

I've loved every NB 6-speed I've driven. I've owned 3 and driven quite a few more, no real complaints. They do suck when the shifter is worn out but with a rebuilt shifter I like them very much.

codrus

I've had 2 Mazdaspeed 6 speeds in my car (thanks for the second one, Ed!) and I agree with this. They've been fine. Not as smooth as the 5 speed, but still better than 80% of other non-Miata gearboxes I've driven.

--Ian

Midtenn

iTrader: (15)

I think that the NB2's change of moving the fore-aft detents from down in the gear box to the shifter rod in the tail shaft greatly improved the feel. At that point there is only the shifter ball and socket between you and the feel. On the NB1's there is a another ball and socket, a spring, and some other smaller rods.

ridethecliche

iTrader: (2)

So to get things straight... there were a bunch of 'upgrades' to the NB2 6 speed from the NB1 version which led to an overall improvement in shifting feel? Anyone used both and care to comment. Are they 'close enough' with a rebuild?

18psi

iTrader: (76)

Not a bunch. A couple. And then the msm got a couple more . Having owned several of each version the nb1/2 is very close, and msm noticeably smoother. Probably had way more to do with mileage and condition tho

Chilicharger665

iTrader: (2)

I agree with Vlad. I had a 6 speed in my 01 and my MSM. The 01 was really loose feeling, but the MR shifter made it awesome to shift. The MSM also got an MR shifter, but it was much, much tighter that the 01's.

turbofan

iTrader: (1)

Indeed, condition matters more than year. The wrecked 10AE I had for a few months had the standard NB1 6-speed and was slick and smooth. It was lovely. A later NB2 I drove was ok but very notchy. My MSM 6-speed with the MR shifter is a rifle bolt awesome piece of sweetness. My dad's MSM sucked ***** when we got it running because it was totally worn out -- loose, off center, notchy, hard to find the gears... 5Xracing shifter rebuild kit and it's also lovely.

So, unless you other folks going from one generation to another had fresh rebuild kits in all the trannies you shifted, it's not an appropriate comparison. Worn out **** sucks.

2slow

My 2001 SE NB2 6 speed was just OK as far as shifting feel (114K miles, fully rebuilt shifter) but the throws were nice and short, I always liked the 5 speed Miata gearbox/shifter that was not old and worn more than 6sp. I do want to try MiataRoasdster SS kit though.

concealer404

iTrader: (3)

Guys. The NC/Fiata 6spd has little to nothing in common with the 6spds that you are talking about other than number of forward gears.

Chilicharger665

iTrader: (2)

I am going to keep the ND and the 124. The ND will be the "race car" and the 124 will be my street car. I am crazy, but I have so many parts that I can mix and match already, that it will work out well.

concealer404

iTrader: (3)

Hrm.

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z31maniac

Just to say they can, the reason Edelbrock used the TVS 900 and now the 1300 because the stock injectors won't do anymore than that.

Same reason the BBR turbo is limited in power as well.