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Old 06-27-2013, 06:33 PM   #1
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Default Gearbox options/experiences

So we were at the dyno last week with the new turbo/engine setup and things were looking good. map was just starting to get there but still really rich and we were just about to start turning the boost up a little when BANG!! stripped 4th on the 6 speed box. had just made 373bhp and around 330fl/lb an the previous run and this run was looking a lot better with some of the fuel pulled out.

With a test day booked for a few days later and no spare 6 speed we threw a 5 speed in knowing it probably wouldn't last the day. took the first few sessions really easy just giving the car a good run down as it was the first time out this year. decided it was time to start pushing on a bit and after 16 laps of medium to hard driving it striped 3rd.

so my question is... should i just keep throwing 6 speeds at it, go down the 5 speed Quaife gear set route or something different?? i would imagine the car should be well over 400bhp after it has been back to the dyno to have the mapping finished. a 6 speed lasted all last season at 355bhp but how will it cope at 400+bhp and whatever torque it makes?
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Old 06-27-2013, 06:48 PM   #2
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Maybe i don't know anything, but aren't the MSM 6 speeds shot peened or something? Or there is something done to them to make them stronger than a regular 6 speed.

Then again, i don't know. I thought i read that somewhere.
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Old 06-27-2013, 08:47 PM   #3
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MSM 6 speed supposedly can take a little bit more torque than the normal 6 speed because of the shot peening. Other straight up bolt on option is the 5 speed with quaife gears.

TII tranny with the adapter plate, I like the gearing on those kind of. Need to figure out a PPF adapter.

T5z with 0.83 5th swap. Seems like decent ratios will either take the power or can be built to. BEGI is supposed to have a cast bell hosing adapter almost ready to go. Needs a shifter re-locator and some sort of PPF adapter.

Lakewood bellhousing adapter options
TKO500, 5 speed, a few gear ratio options can be built for the powah. Needs a shifter re-locator and some sort of PPF adapter.

T101a, this is the NASCAR 4 speed more or less, can be had with an assortment of ~2000 gear ratio options, easy to rebuild, can take 700hp, 4 speed and 4th is a direct drive (1:1) so it will require a ring gear in the 3.3ish range to be useable which means ford 7.5 or 8.8 rear or using a quick change rear like this one. Also needs a shifter re-locator and some sort of PPF adapter, but the shifter re-locate is super easy because its designed for it.

Jericos and other options I didnt look into as much

Texa$ or fab
Tractive sequential
Quaife sequential
etc

Did I miss anything?
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Old 06-27-2013, 09:05 PM   #4
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What about WPC treating the 6spd? The folks over at MotoIQ rave about it.
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Old 06-27-2013, 10:06 PM   #5
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Spend a bunch of money swapping an alternate OEM box with shitty gear ratios into the car, or $$buy$$ a Quaife 5sp with gear ratios similar to the 6-speed (i.e. good for road racing). I did the latter and don't regret it yet.
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Old 06-27-2013, 10:17 PM   #6
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The Quaife setup isnt even Big money. Its only 2ish grand and the labor to pay someone to rebuild it. Its actually probably the cheapest option besides another 6 speed that I mentioned when you dig down into real cost.
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Old 06-27-2013, 10:26 PM   #7
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I want a dog box, and here's where I'm going just as soon as I win the lottery:
Bogger :: Barrington Performance
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Old 06-28-2013, 04:31 PM   #8
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Quaife. Get the short ratio 1-3, long 5. That gives you a 1st gear you can actually use.

Use a low milage NB donor and pay a good gearhead to make things fit. You will have the best shifting 5-speed in a Miata and good ratios. The Quaife kit is not bolt-in.

The only other option is forking out big dollars for a sequential box, which means bell housing, box, mounts, drive shaft, etc.
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Old 06-28-2013, 04:37 PM   #9
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Is there even a North American dealer for Quaife that still has these in stock that will swap out the gears?
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Old 06-28-2013, 05:02 PM   #10
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Quote:
Originally Posted by Ski_Lover View Post
I want a dog box, and here's where I'm going just as soon as I win the lottery:
Bogger :: Barrington Performance
We sent him a pile of dead AZ-6's recently. They're developing a sequential conversion for the AZ-6 6 speed (90-05 Miata). Ron tells me it'll cost a lot more than a Quaife gearset for the 5 speed but a lot less than a Quaife QBE60G sequential. Anxious to see how this turns out. Most of his customers are EP and a few GT3/STL guys so it might not be optimized for big power. We'll see. The thought of sub $9k custom ratio 6spd sequential in a 350whp track Miata is..
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Old 06-28-2013, 05:50 PM   #11
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We are a Quaife dealer, and the parts are still listed on their website. I'd be happy to inquire about having a set sent over in any specific ratios, and we could build the 'box for you as well.

Jack's Transmissions
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Old 06-28-2013, 06:28 PM   #12
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Quote:
Originally Posted by emilio700 View Post
We sent him a pile of dead AZ-6's recently. They're developing a sequential conversion for the AZ-6 6 speed (90-05 Miata). Ron tells me it'll cost a lot more than a Quaife gearset for the 5 speed but a lot less than a Quaife QBE60G sequential. Anxious to see how this turns out. Most of his customers are EP and a few GT3/STL guys so it might not be optimized for big power. We'll see. The thought of sub $9k custom ratio 6spd sequential in a 350whp track Miata is..
I'll stop fantasizing about the ~$20k hewland sequential boxes then for now
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Old 06-28-2013, 07:34 PM   #13
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Quote:
Originally Posted by emilio700 View Post
The thought of sub $9k custom ratio 6spd sequential in a 350whp track Miata is..
Win - I'll play test mule
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Old 06-29-2013, 10:01 PM   #14
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Quote:
Originally Posted by emilio700 View Post
We sent him a pile of dead AZ-6's recently. They're developing a sequential conversion for the AZ-6 6 speed (90-05 Miata). Ron tells me it'll cost a lot more than a Quaife gearset for the 5 speed but a lot less than a Quaife QBE60G sequential. Anxious to see how this turns out. Most of his customers are EP and a few GT3/STL guys so it might not be optimized for big power. We'll see. The thought of sub $9k custom ratio 6spd sequential in a 350whp track Miata is..
So what you're saying is that I should just suffer though only having 200 ftlbs of torque for an extra season and buy the lights out ultimate tranny. It will still have reverse right?
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Old 06-30-2013, 02:22 AM   #15
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Quote:
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What about WPC treating the 6spd? The folks over at MotoIQ rave about it.
Btw, don't think WPC is cheap. Doing tranny internals is over $1000 for sure
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Old 06-30-2013, 01:50 PM   #16
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Quote:
Originally Posted by Leafy View Post
So what you're saying is that I should just suffer though only having 200 ftlbs of torque for an extra season and buy the lights out ultimate tranny. It will still have reverse right?
I won't be selling these things if Barrington successfully develops them. Contact them to find out more.
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Old 07-01-2013, 06:32 PM   #17
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The Barrington sequential (if it comes to light) will only hold 250lbs of tq. Not gonna be a option for the high torque turbo guys but us lowly rotrex guys are gonna love it!
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Old 07-01-2013, 09:50 PM   #18
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And... how exactly do you know this? Just saying, if true, this sucks - out for being test mule...
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Old 07-01-2013, 11:19 PM   #19
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I heard this from Ron at Barrington. I guess there are limits if you are using the stock case.
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Old 07-02-2013, 10:57 AM   #20
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soo.... don't use the stock case!
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