Another 6 speed bites the dust. - 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 10-14-2013, 08:13 PM   #21
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Hell, $5500 buys you 10 running beater Miatas to steal transmissions from...

The only reasonable solutions are Shadowconspiracy's T2 adapter plates and the Quicktime bell housing.
are the T2 trans really stronger? pretty sure I want something with an overdrive. what about a TKO Hurst Driveline Conversions TCET4618 Hurst Driveline TKO 500/600 5-Speed Transmissions
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Old 10-14-2013, 08:30 PM   #22
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Originally Posted by vehicular View Post
Hell, $5500 buys you 10 running beater Miatas to steal transmissions from...

The only reasonable solutions are Shadowconspiracy's T2 adapter plates and the Quicktime bell housing.
Trailer park post.
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Old 10-14-2013, 09:12 PM   #23
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are the T2 trans really stronger? pretty sure I want something with an overdrive. what about a TKO Hurst Driveline Conversions TCET4618 Hurst Driveline TKO 500/600 5-Speed Transmissions
The T2 trans is commonly drag raced over 500whp. TKOs are tough as nails, but expensive. The Mustang guys abuse the **** out of them.

If I were building a no-holds-barred Miata track day/ autocross car (and didn't want to go broke), I think I'd build a Tex T101/ Jericho/ etc NASCAR trans from parts on ebay with a 1:1 top gear and a REALLY short first gear, and put a 3.08 geared Ford 8.8 in the back. You'd never break it, and I think it's the cheapest way into a bulletproof drive train. The ex NASCAR parts can be had for next to nothing if you're willing to buy everything piecemeal and put the trans together yourself, and an 8.8 from an IRS Mustang Cobra or possibly a 4.6L Thunderbird wouldn't set you back too much either.

If you wanted to street drive it at all a T2 trans is probably your best bet, but if you don't break transmissions I'd be afraid of stripping teeth off the ring gear in the toy rear end, instead.
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Old 10-14-2013, 09:12 PM   #24
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Trailer park post.
Roll tide.
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Old 10-14-2013, 09:22 PM   #25
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How about using a AVCR boost controller to tone down peak torque a bit? If 4th is the only problem you can detune peak torque only in that gear. Kinda simple solution that will allow you to stick with the 6 speed.

The AVCR allows control of boost by RPM and boost by gear.
baby != bathwater
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Old 10-15-2013, 01:36 PM   #26
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Roll tide.
Hook em gays!
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Old 10-15-2013, 05:10 PM   #27
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An RX7 gearbox seems to be the next logical step, before going full out crazy on a Jerico box or on a Quaife gear-set.

Luckily, the rx7 gearboxes are pretty cheap. Heck, the bellhousing adapter plate is 2-3x the cost of the gearbox itself. You only have to buy the adapter plate once, and you can probably pick up 3 rx7 gearboxes for the price of one six speed...
A certain SSM RX7 got a Jericho box after mulching transmissions for several years. If you are going to upgrade, do it so you never worry about it again. I just need to find that money tree. The XP car really needs a used roundy roundy transmission.
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Old 10-15-2013, 05:48 PM   #28
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lol at guys saying "just buy more trannies"... what about the financial losses by paying for track time but pissing it away because you had to do a tranny swap at the track - if you can. You'll lose a good day especially if you're instructing as you're obligated to coach and wrench on your car when you can. It's a big headache for one, second is you get tired of doing it where it makes your time NOT having to swap out trannies even more valuable.

At a projected 400+ rwhp, and reading Bundys problems... I really am leaning toward saving my 6spd for the DD and doing something better for the track car... so I'm watching you Bob, I'm watching you
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Old 10-15-2013, 11:16 PM   #29
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lol at guys saying "just buy more trannies"... what about the financial losses by paying for track time but pissing it away because you had to do a tranny swap at the track - if you can. You'll lose a good day especially if you're instructing as you're obligated to coach and wrench on your car when you can. It's a big headache for one, second is you get tired of doing it where it makes your time NOT having to swap out trannies even more valuable.

At a projected 400+ rwhp, and reading Bundys problems... I really am leaning toward saving my 6spd for the DD and doing something better for the track car... so I'm watching you Bob, I'm watching you
LOL this one was one I bought at Laguna Seca earlier this year and swapped in during the middle of the track day and managed to run sessions 1, 2, part of 3 and 5. it was really expensive to buy a Mazdaspeed tranny at the track and my wife took my credit card away after that one and gave me a card with a lower limit.

Last edited by bbundy; 10-15-2013 at 11:27 PM.
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Old 10-15-2013, 11:31 PM   #30
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Anybody actually buy parts and rebuild a 6 speed? I got two of them with broken 4th gears and another one that has some sort of bearing issue.
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Old 10-15-2013, 11:57 PM   #31
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Why not look at a shop that makes hardened gears and have them make you new set of gears?
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Old 10-16-2013, 02:35 AM   #32
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Originally Posted by bbundy View Post
LOL this one was one I bought at Laguna Seca earlier this year and swapped in during the middle of the track day and managed to run sessions 1, 2, part of 3 and 5. it was really expensive to buy a Mazdaspeed tranny at the track and my wife took my credit card away after that one and gave me a card with a lower limit.
Yeah, the guy with the Spec Miata shop in Salinas made a bundle that day. I think he sold 3 transmissions, 2 6-speeds and a 5-speed.

How many track days did you get on the MSM box? Were they all at the same reduced boost level? Breaking it at 280 ft-lbs has me a bit worried, I'm not far below that even though I've got a teeny weeny turbo.

--Ian
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Old 10-16-2013, 03:56 AM   #33
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Why not look at a shop that makes hardened gears and have them make you new set of gears?
Team up with TSE and design a new gear set that might be available to the public in 2016 or so
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Old 10-16-2013, 06:28 AM   #34
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Anybody actually buy parts and rebuild a 6 speed? I got two of them with broken 4th gears and another one that has some sort of bearing issue.
They use the same guts as the RX8 transmission with a slightly different case. ISC Racing has rebuilt a bunch of them and claims it isn't a very reliable transmission in racing for the RX8s. But he can definitely rebuild them.
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Old 10-16-2013, 11:55 AM   #35
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Team up with TSE and design a new gear set

Why doesn't 949 or TSE sell gear sets? There's obviously a need for them. Somebody page Emilio.
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Old 10-16-2013, 12:05 PM   #36
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Can someone not cryo-treat the gears?
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Old 10-16-2013, 12:09 PM   #37
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TNTUBA cryo treated, shot peened, and possibly WPC treated the gearset in his five speed, and it made it most of an autocross season. He's doing a Jericho over the winter.
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Old 10-16-2013, 12:15 PM   #38
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At Bundy's power levels I would not be wasting my time with half measures. He just needs a beefier solution. Guys like Genesplicer and Savington are facing the same problem. If they all get together and work on a solution the cost of development can be shared.
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Old 10-16-2013, 12:30 PM   #39
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Originally Posted by Efini~FC3S View Post
Why not RX-7 5-speed?

An RX7 gearbox seems to be the next logical step, before going full out crazy on a Jerico box or on a Quaife gear-set.

Luckily, the rx7 gearboxes are pretty cheap. Heck, the bellhousing adapter plate is 2-3x the cost of the gearbox itself. You only have to buy the adapter plate once, and you can probably pick up 3 rx7 gearboxes for the price of one six speed...
Is this not a good idea?
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Old 10-16-2013, 12:47 PM   #40
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Quote:
Originally Posted by bbundy View Post
LOL this one was one I bought at Laguna Seca earlier this year and swapped in during the middle of the track day and managed to run sessions 1, 2, part of 3 and 5. it was really expensive to buy a Mazdaspeed tranny at the track and my wife took my credit card away after that one and gave me a card with a lower limit.
Jesus Bob, sorry to hear about that. I wish I had known/been there. I have a 6 speed sitting in my garage waiting for me to get my act together and I'm about 7 minutes from MRLS.

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Yeah, the guy with the Spec Miata shop in Salinas made a bundle that day. I think he sold 3 transmissions, 2 6-speeds and a 5-speed.
There is a Spec Miata shop in Salinas? O.o I thought Hartzel was the only one playing with these things in Monterey County. I've called Hartzel twice about work and he managed to shoo me away both times like he didn't want my business.

Sorry for the derail, but seriously guys, if you break **** at MRLS and you need tools/parts/extra hands with something, PM me and I'll get you my cell number if I'm around.
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