SR OS Giken Gear Set in CA Bell housing

[Asad.C]

Hi Guys,

I'm looking for a gearbox upgrade on the CA for when I chase some stupid power one day in the future. So just exploring my options.

So I have seen loads and loads of forum posts on the net saying the CA and SR gearboxes are identical and only the bell housing is different.

If that is the case then would the SR20 OS Giken Gear Set work with the CA Gearbox?

http://www.osgiken.net/products.php?product=gear

https://www.nengun.com/os-giken/close-gear-set

The alternative would be to go Z32 gearbox which would prob be a cheaper option too.

Thanks in advance.

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[green_rs13]

think I would spend my money on a rebuilt rb25 or z32 box.

the 350z guys seem to have their own troubles with the z33 box so they are priced high due to the demand.

[sparky_s13]

Depends what you call "stupid power"

Upto 500hp I would use a RB box but anything over you will be wanting a tidy Z33 box

[CNHSS1]

I have a Z32 gearbox and Mazworks CA adaptor plate for sale if you're interested?

[Asad.C]

I have a Z32 gearbox and Mazworks CA adaptor plate for sale if you're interested?

Just curious. How much you after?

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[skyshack]

Baulk ring clutches are different on SR box.

But with new gears in the box you would be wanting to fit all new selectors anyway.

[CNHSS1]

http://sxoc.com/vbb/showthread.php?5...ght=Z32+cnhss1

[Asad.C]

Baulk ring clutches are different on SR box.

But with new gears in the box you would be wanting to fit all new selectors anyway.

So does this mean that it would be possible to put the OS Giken Gear Set into the CA box?

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[user23456]

yep change the bellhousing and it will be a straight fit.

im not sure how much power the os kit can take tho. I know the gears are bigger, but they are still in the tiny ca box so oil could be an issue. Thats why I opted for the z32 conversion. the mazworx drag car was running stupid power through the z32 box

[user23456]

plus the cost of the z32 box conversion compared to the cost of the giken gear set - then having to fit it, the z32 option makes more sense.

also second hand giken boxes go for around the £1000 mark and CNHSS1 is selling his kit cheaper. all you would need to do is measure the prop and get it welded and balanced, better yet take it to garage D and let Julian do it. should'nt cost too much to do

only issue I have is the location of the gear stick, but im slowly getting used to it.

[Asad.C]

Thanks for the advice guys.

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[Asad.C]

yep change the bellhousing and it will be a straight fit.

im not sure how much power the os kit can take tho. I know the gears are bigger, but they are still in the tiny ca box so oil could be an issue. Thats why I opted for the z32 conversion. the mazworx drag car was running stupid power through the z32 box

Hi mate. Sorry but I don't no much on this so I'm learning everyday. So u said it will fit the CA18DET and box but change the bell housing? Bit confused.

Also I read that the OS Giken is rated around 600 bhp. I am thinking going Z32 but still want to know about the OS Giken. Thanks again.

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[zeppelin101]

Gear teeth are rated in terms of torque, not horsepower. 600hp could be any amount of torque, depending on what engine speed it's made at.

[Asad.C]

Gear teeth are rated in terms of torque, not horsepower. 600hp could be any amount of torque, depending on what engine speed it's made at.

Fair enough. I was only going off of what I read here.

https://www.nengun.com/os-giken/close-gear-set

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[zeppelin101]

I was just having a look to see if there were any torque figures any where and it looks like a bust, which is annoying. You would hope they might design it to be good for 50% over the original gear set in which case somewhere around 7-800 Nm mark is probably a reasonable guess.

Has anyone failed the actual gear teeth in an SR box? I know when mine went I had the remains of a selector fork and bits of brass in the oil so assumed the syncros were heavily worn. No tooth damage at 400 Nm in that instance.

[polcastrol]

The space inside the box is too small to transfer power. I had second gear, third gear and 2 output shafts on standard box + third gear on a PPG box(helical gear dog box).

[alanjuggler]

it depends on your use case.

If you're planning for pure track work - the OSG makes sense as the ratios are set up for that.

the RB25 ones are rather more road friendly (though I manage quite well with the OSG ratios, an RB25 and a 4.083 diff)

I've not stripped a gear on a CA box - I sheared the woodruff key off on the mainshaft (from memory, was a long time ago) so lost drive.

I did chip a tooth off the OSG layshaft (the tooth that runs third) - thought that was after many years of use - quite a lot of it by Richie with drag work and 600bhp+ - so I'm imagining metal fatigue was an issue with that.