Will the 6 Speed hold up to....considered discussion - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Suspension, Brakes, Drivetrain discuss the wondrous effects of boost and your miata...

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Old 01-22-2016, 11:09 AM   #21
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Quote:
Originally Posted by Savington View Post
As a data point, I killed my 6-speed in the same way (4th gear pull through the torque peak).
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300 wheel torque 4th gear in the 6 speed will not like. been there done that multiple times over and over.
Just out of curiosity, are either of you guys using external trans fluid coolers?
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Old 01-22-2016, 12:28 PM   #22
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Kmiata... Calling Kmiata....
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Old 01-22-2016, 01:02 PM   #23
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Kmiata... Calling Kmiata....
That would probably be the best bet.
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Old 01-22-2016, 01:22 PM   #24
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its obvious 2jz is the answer to all things


jk its a heavy pig and does not belong on the track.

+1 for k miata
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Old 01-22-2016, 02:53 PM   #25
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yup agreed, Kmiata sounds like the better option here.
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Old 01-22-2016, 03:09 PM   #26
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yup agreed, Kmiata sounds like the better option here.
Is this a RHD car? If so, our swap still requires some fabrication. We don't have a full RHD swap kit (yet). It will happen eventually.

But a K is perfect for the 6 speed. 300whp is easy, and with 200-210wtq or so.
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Old 01-23-2016, 05:38 AM   #27
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we considered a K, but k's are $4k or more here....same old issue, kit costs....well whatever it is, double that for the exchange rate, add a few hundred for freight, then 15% sales tax and then another $200.00 or more for customs duty....just gets too expensive.

you guys just don't know how good you have it....9" 6uls cost $1500-$1700 to land here...makes me cry....

Then again we don't have guns so maybe not so bad


Interesting info on the altezza 6 speed, will look more in to that....thanks.
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Old 01-23-2016, 08:06 AM   #28
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So you can't even shoot somebody if they had all the parts you needed?

What a world.
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Old 01-23-2016, 02:45 PM   #29
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we considered a K, but k's are $4k or more here....same old issue, kit costs....well whatever it is, double that for the exchange rate, add a few hundred for freight, then 15% sales tax and then another $200.00 or more for customs duty....just gets too expensive.

you guys just don't know how good you have it....9" 6uls cost $1500-$1700 to land here...makes me cry....

Then again we don't have guns so maybe not so bad


Interesting info on the altezza 6 speed, will look more in to that....thanks.
Yeah, the import expense is really the issue.

This why we'll complete an LHD NC swap kit before we spend any time on the RHD kits. I think there is lots of interest, but its cost prohibitive in a lot of markets.
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Old 01-23-2016, 02:59 PM   #30
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Quote:
Originally Posted by mx5-kiwi View Post
we considered a K, but k's are $4k or more here....same old issue, kit costs....well whatever it is, double that for the exchange rate, add a few hundred for freight, then 15% sales tax and then another $200.00 or more for customs duty....just gets too expensive.

you guys just don't know how good you have it....9" 6uls cost $1500-$1700 to land here...makes me cry....

Then again we don't have guns so maybe not so bad


Interesting info on the altezza 6 speed, will look more in to that....thanks.
Sounds like your country hates my two favorite hobbies.
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Old 01-30-2016, 08:52 PM   #31
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Does anyone know anything about cyrogenic treatment? It sounds like a good system. I am going to call some places Monday and chat with them. It sounds like it might work even for rear hubs and brake rotors. The link below only shows up as" transportation" for whatever reason

Transportation

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Old 01-30-2016, 09:42 PM   #32
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Does anyone know anything about cyrogenic treatment?
Both cryo and REM-ISF treatments are aimed at getting the last few percentage points of life out of a trans/driveline. It's not going to make a huge difference.
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Old 01-30-2016, 09:59 PM   #33
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Sense torque seems to be the issue with the six speed, mainly 4th, I thought that the section at the bottom of that article was very interesting about that scraper diff. They are saying 7 times the longevity out of brake rotors, that is pretty significant.
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Old 02-01-2016, 06:30 AM   #34
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I wonder why we haven't just tried to target 4th and make a afterwork 4th gear set from like 300m or some other high strength gear steel. Shot peen,cryo,rem finish it and see if the trans will hold the 300 ftlbs.

There has been a lot of talk of full gear sets, but i only see the gear sets selling to a limited number of people. Most people don't wanna drop $4000 on gears and another $1000 on install.
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Old 02-01-2016, 12:50 PM   #35
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It always comes down to the overall package.

Sure its possible to make an AZ6 gear set in a Miata case that can handle 400 plus HP reliably. But it will cost as much as a T-56 or TR6060. At which point you just spent a big portion of a swap budget to build a driveline sitting behind a BP that has pretty massive reliability issues anywhere over 300HP. You either build it right with a lot of $$$ or you blow it up, or you only use it for street duty. And there are dozens of cars (including NCs) that will make for better high-HP street cars than an NA or NB. Almost nobody is interested in transmissions beyond 300WHP for a street driven BP car.

So lets swap some other trans in there and go for a cheap solution. As outlined in painful detail by Sav, that is really hard to do while retaining the kind of gearing that is exactly what guys with 300+ WHP NAs and NBs want on track. Thinking of the T5 here. And you still wind up spending at least another $1000 over the cost of another 6 speed to get inferior gearing.

You either spend a lot of cash to retain an inferior power plant, or you spend a moderate amount of cash to retain an inferior power plant with some customization hassles and inferior gearing.

The 4th only idea is interesting, but I really wonder what happens when you fix that one issue. Does that same trans fail 3 races later because XYZ? Does 3rd give up? The vast majority of 6 speeds that have failed have just been scrapped or lie in piles next to garages. Very few have had a new 4th thrown in to see what blows up next. 4th might be acting as a fuse and the other may not be far behind. Considering the ratios, that actually seems very plausible.

K swaps and brotrex's may well be the way to go if you want a 400WHP NA or NB that does not shatter 6 speeds all the time, because lower TQ, while retaining some pretty amazing real-world track performance.
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