Quaife or OSGiken for 400+ engine ?
#4
Senior Member
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Join Date: Jan 2011
Location: Chattanooga, Tn
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Good to know that the gearbox in my car that has lived behind a 400hp motor for 3 years of racing on 275 (now 295)mm wide slicks is no stronger than a stock 5 speed(That I killed 7 of in one season) ![Jerkit](https://www.miataturbo.net/images/smilies/jerkit.gif)
In Pro Solos we launch this thing at 5000 RPM and 21 PSI.
Most every issue I have seen with that gear-set is related to the instillation or build of the gearbox.
After 3 seasons I pulled mine apart for PM and found some spalling on the main shaft and lay shaft gears so I replaced them and the 2nd gear hub had some wear (I had forgotten that I reused an old used hub out of the donor box when I built it) so I ordered one of those from Mazda and threw new syncros in it and it's butter.
![Jerkit](https://www.miataturbo.net/images/smilies/jerkit.gif)
In Pro Solos we launch this thing at 5000 RPM and 21 PSI.
Most every issue I have seen with that gear-set is related to the instillation or build of the gearbox.
After 3 seasons I pulled mine apart for PM and found some spalling on the main shaft and lay shaft gears so I replaced them and the 2nd gear hub had some wear (I had forgotten that I reused an old used hub out of the donor box when I built it) so I ordered one of those from Mazda and threw new syncros in it and it's butter.
#6
Former Vendor
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Join Date: Nov 2006
Location: Sunnyvale, CA
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Total Cats: 2,102
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https://www.miataturbo.net/build-threads-57/i-give-up-93051/
https://www.miataturbo.net/suspension-brakes-drivetrain-49/death-quaife-79417/
Plus a third non-public failure that I know of and can't discuss further.
I don't recommend Quaife 5sp boxes to my customers.
https://www.miataturbo.net/suspension-brakes-drivetrain-49/death-quaife-79417/
Plus a third non-public failure that I know of and can't discuss further.
I don't recommend Quaife 5sp boxes to my customers.
#16
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Good to know that the gearbox in my car that has lived behind a 400hp motor for 3 years of racing on 275 (now 295)mm wide slicks is no stronger than a stock 5 speed(That I killed 7 of in one season) ![Jerkit](https://www.miataturbo.net/images/smilies/jerkit.gif)
In Pro Solos we launch this thing at 5000 RPM and 21 PSI.
Most every issue I have seen with that gear-set is related to the instillation or build of the gearbox.
After 3 seasons I pulled mine apart for PM and found some spalling on the main shaft and lay shaft gears so I replaced them and the 2nd gear hub had some wear (I had forgotten that I reused an old used hub out of the donor box when I built it) so I ordered one of those from Mazda and threw new syncros in it and it's butter.
![Jerkit](https://www.miataturbo.net/images/smilies/jerkit.gif)
In Pro Solos we launch this thing at 5000 RPM and 21 PSI.
Most every issue I have seen with that gear-set is related to the instillation or build of the gearbox.
After 3 seasons I pulled mine apart for PM and found some spalling on the main shaft and lay shaft gears so I replaced them and the 2nd gear hub had some wear (I had forgotten that I reused an old used hub out of the donor box when I built it) so I ordered one of those from Mazda and threw new syncros in it and it's butter.
#19
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The reason we created the BMW trans kits is because there was demand for something other than a Miata trans in these cars. We weren't seeing people overall very satisfied with the Quaife gears.
E46 6-speed kits are about to drop, as well as our bolt-in Torsen mount for an easy PPF delete. So that will be another option to consider as well.
E46 6-speed kits are about to drop, as well as our bolt-in Torsen mount for an easy PPF delete. So that will be another option to consider as well.
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KPower Industries
Home of the original KMiata Swap
![](https://www.miataturbo.net/signaturepics/sigpic27665_14.gif)
K24 NC swap is coming in 2024! Learn more
info@kpower.industries
Follow us on Facebook and Instagram
#20
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
The reason we created the BMW trans kits is because there was demand for something other than a Miata trans in these cars. We weren't seeing people overall very satisfied with the Quaife gears.
E46 6-speed kits are about to drop, as well as our bolt-in Torsen mount for an easy PPF delete. So that will be another option to consider as well.
E46 6-speed kits are about to drop, as well as our bolt-in Torsen mount for an easy PPF delete. So that will be another option to consider as well.