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R32 Box In R33 Is It Wise

FATO33
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FATO33 Apprentice

FATO33

Posted
Posted

hi there getting a manual conversion done on my r33 but shop wants to put a 32 box in cause alot cheaper or they said can have r33 box for $1000 more should i pay the extra and get r33 box or just get r32 box. can the gearbox be strenghtened at all so it will cop the hp. will have around 370 hp

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Ryanrb25 Grand Master

Ryanrb25

Posted
Posted

i wouldnt push any more than 200rwkw from an rb25det through an rb20det box, i had one behind my 205rwkw rb25det in an R31, i was surprised it handled it quite well. all depends how you drive i suppose. If your going to bang gears with an on off clutch it wont last 5 minutes with 370hp which is around 270kw. no way. definetly go for the rb25det box. it wont be long before changing the box anyways....

philta Community Regular

philta

Posted
Posted

ull save the labour cost, in replacing gearbox in the future.

may i ask how will it be strengthend? wont taking the gearbox and getting heat/cryo treated ending up costing u similar anyways? i was going to do this as well since my mate has a r32 wreck, his gearbox is in good nick but i knew if ill go manual i would have bigger plans for what the box can handle.

dont think about the initial cost, something that may seem cheap isint cheap in the long run.

BHDave Grand Master

BHDave

Posted
Posted

You're better off getting a 25 box purely for ease of fitting.

I don't know which work shop you are going to but the extra cost of the 25 box should be partially offset by being able to use standard tailshaft, crossmember and speed sensor. Id have thought the difference would be closer to 500 to be honest, considering the difference in purchase price of the boxes is only around $900.

An rb20 box will require custom tailshaft and crossmember but an sr20 speed sensor should fit in and work properly.

Oh and my 20 box is holding up to 288rwkw behind a 25 now :laugh: I doubt it will last though.

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