So in this months issue of Super Street they mention OS Giken has released a close ratio gear set for our gearbox. I've seen a bit about it around the forum but this seem like an official realease.

Any vendors have more info on it?

 

What is it that you want to know?

 

Price, gear ratios, is it a direct swap from the factory gear set, any special modifications that might be needed, is it a gearbox that could be used regularly or is it purely for the track?

 

Included Parts in the kit:

Countershaft, 1st main gear, 2nd main gear, 3rd main gear, 3rd counter gear, 4th main gear, 4th counter gear, 5th main gear with input shaft and 6th main gear

MSRP:

$4,190 as of 2010

gear ratio comparison:

OEM---1st 3.794, 2nd 2.324, 3rd 1.624, 4th 1.271, 5th 1, 6th 0.794
OS---1st 2.783, 2nd 1.961, 3rd 1.507, 4th 1.217, 5th 1, 6th 0.812

Construction is similar to their other gearsets, using steel alloy material, chemical heat treating, etc.

 

That's an interesting choice of gear ratios. The OEM box has closer ratios than the supposed "close ratio box" from OS.

Do you know why they would have chosen the longer gears?

I suppose for the big power FI guys it makes the lower gears more useable.

 

it doesnt support high hp, last i read it was for a sub 600hp setup.

 

Last time we spoke to O.S. we were told that it has an estimated power capacity of 700-1000hp depending on usage and related components. However, they also mentioned that it was designed for circuit competition on an NA platform.

 

Looks like it was being showcased at SEMA this past year...

http://www.youtube.com/watch?v=8RxaLNjkAss

 

Come to think of it it does actually make good sense. What they've done is make 1st a really long gear, and then just bunched the rest of them closer to each other.

 

Listening to the vid I think the guy says more single letters than actual words.

 

any idea if they'll fit the HR tranny?

 

I think HR tranny will fit fine as CD009(later model transmission) fits 03Z without any problem.

 

Sorry for digging up an old thread while searching.

Does anyone know whether the CD009 has the same gear ratios as the unit from a stock 03' 6MT Z33?

 

All 03 to 06 MT trans have the same ratio. Would love to get the OS gear set, 1st may actually be a usable gear with it.