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Originally Posted by JustJeff
One question, are the Cosmo 13B-RE gears a direct swap? I'm still researching that one, but had been told they are hardened but a direct swap...but they also do NOT have the better bearings that the FD and RX-8 have.
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I can't confirm on the Cosmo stat gears...
The Cosmo (20B only?) runs a 3-window bearing on the stat gears.
The 3 windows are slotted.
Mazda Comp (now Mazdaspeed) used to sell them as "Mazda competition bearings" back in the day.
The FD3S 13B-REW runs a 9-window bearing - 9 drilled holes throughout the stat gear bearing.
It's arguable whether which is better, but the 13B-REW ones are the newest design and therefore arguably better.
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Just to complete the conversation for anyone who is searching for related info. I had read conflicting info about using RX8 gears. Some said they are a direct swap and other said you need to shave off like .001 on 13B e-shaft to accommodate the gear.
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Sorry, I can't confirm either.
I don't mess with RX-8 stuff.
For me, the RX-8 wasn't turbo'd so why try and use "NA" parts in our turbo'd application?
-Ted