Transmission Swaps
Hello Guys:
I have been reading and searching a lot about Miatas in general and there seems to be a general rule regarding transmissions, or more exactly, the 5 speed transmission: "After 230-250 hp, the tranny life expectancy is uncertain, some last some dont, with the average Joe breaking 5 speeds left and right" Anyway, there seem 4 options: 1-Reinforcing the stock 5 speed (cryo, micropolishing, shot peening, Carbonizing the gears) 2-Upgrading to a Quaiffe gearbox or complete tranny. 3- Make a 6 speed swap and be safe at least until 400whp 4- Make a 5 speed RX7 transmission swap. To do a 6 speed swap, and I quote from Solomiata: "The 99+ Miata 6-speed is made by Aisin and is not related to the Type II 5-speed (it is listed below for reference ony). Will the 6-speed bolt in a 5-speed Miata? Yes, make sure to get the trans plate and shifter from the 6-speed donor since they are unique to it. You will have to use only two of the three 5-speed starter bolts but that shouldn't be an issue, otherwise it bolts in (same PPF mount, etc). Keep in mind the 6-speed is combined with a 3.909:1 rear in the USA (3.636:1 other markets) since the tranny gearing is much steeper so your '90-93 or 99+ 4.30:1 5-speed rear should also be changed to the 3.909 or at least the more common 4.10:1 otherwise you'll have a nice tree stump puller" My questions: What about the RX7 tranny swap? What does it envolve? Anything else needed for the 6 speed swap? Any personal advice on transmissions for the Miata and BP platform? My goal is 400 whp. Thanks, Roger BTW We should make more stickies!!!:) |
btw you should search...there are a shit ton of tranny threads here...no pun intended
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Search.
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I like bananas
I say do the 6 speed swap, its the easiest. I wouldnt want to undertake an RX7 swap unless it was a track only car and I had plenty of time and money, and skills and tools. |
search, this is beaten to death. Enjoy cryo treating and polishing powdered steel.
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OK OK I will search more. But it seems like the RX7 swap is difficult, the 6 speed is. Roger
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yep
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if you get 3 more people to agree to it, we can get some dog cut PPG gears for the 5 speed :naughty:
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details on "ppg gears?"
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Originally Posted by hustler
(Post 374367)
details on "ppg gears?"
When I inquired about the gears We are nil-stock on this product and will not be putting it back into production until we receive orders for 5 or more sets which may be mid this year. The cost was approximately $7800aud https://www.miataturbo.net/forum/t29169-2/ |
lol, 1:1 5th. 5000rpm on the highway, anyone? I would also max 5th on three different tracks in California.
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Originally Posted by Savington
(Post 374379)
lol, 1:1 5th. 5000rpm on the highway, anyone? I would also max 5th on three different tracks in California.
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nice, sequential boxes are great because they last a few hundred miles and are so expensive. Also, I had spur gears in the corrado...I do not miss them.
btw, 3rd gear gets louder every time I drive my car...and I've driven in fear since I put it back on the road. |
Quaife has the upgraded gear set for the miata for about $1k cheaper than FM, and they also have "universal" 6 speed sequential transmission with helical cut gears or straight cut. Although I'm not too sure how much the shipping is from the UK.
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