Hey guys I swapped a BMW 5-speed transmission into my non-abs non-Hicas S13, now the final drive ratio is horrible I need a longer gear ratio. From what research I've done stock ring and pinion is 4.08... and I'm thinking I need closer to a 3.3 or 3.2 ballpark. Any suggestions on where I can find the right ring and pinion?
How do I make s13 gearing taller?
Calvitron42
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Hey guys I swapped a BMW 5-speed transmission into my non-abs non-Hicas S13, now the final drive ratio is horrible I need a longer gear ratio. From what research I've done stock ring and pinion is 4.08... and I'm thinking I need closer to a 3.3 or 3.2 ballpark. Any suggestions on where I can find the right ring and pinion?
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Check these two sites out
First link is wrong where you see the S15 6MT ratio, it is 3.692 NOT 3.392.
You wants that will fit an R200 unless you are implanting the entire diff into the subframe (involves cutting and welding)
.
Please do more research before you do anything else. You should know what's involved before you go down a path.
I'm sure the BMW trans was probably plentiful and cheap, but you should have talked to the other guys who did it and ran into the same exact problem as you.
Personally I would have done the Z32 trans. Same ratios as S13/S14 but stronger. I would have bought a crappy one to rebuild and installed that before the BMW trans but that's just me.
Let me know what you end up doing
First link is wrong where you see the S15 6MT ratio, it is 3.692 NOT 3.392.
You wants that will fit an R200 unless you are implanting the entire diff into the subframe (involves cutting and welding)
The low-down on S13 Diff options? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum
The low-down on S13 Diff options? Archive and FAQs
www.zilvia.net
Please do more research before you do anything else. You should know what's involved before you go down a path.
I'm sure the BMW trans was probably plentiful and cheap, but you should have talked to the other guys who did it and ran into the same exact problem as you.
Personally I would have done the Z32 trans. Same ratios as S13/S14 but stronger. I would have bought a crappy one to rebuild and installed that before the BMW trans but that's just me.
Let me know what you end up doing
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2 Posts
Well, research was not the issue here. However, thanks for the links unfortunately the simple answer to my question is there aren't any ring and pinion sets that will go into an S13 R200 and I had to go with a g37 3.357 diff swap. More work but pretty simple and I won't have to worry about shimming or tolerances in the gear set.
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2,218 Posts
This was another thread that I remember reading
Thought I saw something about the final drive from a Y34 or something that has an auto RB20/ RB25.
I browsed through this thread again and saw some stuff.
BMW Transmissions on SR20's - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum
BMW Transmissions on SR20's Tech Talk
zilvia.net
Thought I saw something about the final drive from a Y34 or something that has an auto RB20/ RB25.
I browsed through this thread again and saw some stuff.
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