R32 Gtr Gear Box

[UWISSH!]

ive got the box pulled apart and second gear in gone 2 selector forks, main shrift and synchro's..

from memory dont u have an os giken quad plate clutch???? not the most friendly clutch.

ive got the same box but use nismo coppermix comp clutch n have never had a problem, launched several times at 8000rpm +

still not a single problem, car is driven everyday

twoogle used same box to run 9s with 500kw n only using twin plate clutch.

my suggestion is to ditch your quad plate clutch

[T04GTR]

yes he did. and i could have a cup of coffee inbetween gear changes..

[Beer Baron]

yes there are upgraded synchro boxes available. I have one in my 32. made by auto gallery yokohama. it's a good box. i've used it for about 5 years with no drama.

[djr81]

yes there are upgraded synchro boxes available. I have one in my 32. made by auto gallery yokohama. it's a good box. i've used it for about 5 years with no drama.

What do they upgrade Baron & what ratios are in it?

[GTRAAH]

What if i have an os giken and later down the track i want to upgrade the synchros only is that possible?

[Beer Baron]

you can do a mix of the OS box and AGY bits.

DJR81, they have their own double cone synchros. they also do various different close ratio gear sets too just like OS Giken.

I have bought and sold a couple over the years. good boxes. they even make a clutch bearing and pivot oiling system too!

[Beer Baron]

they do a nice transfer case overhaul too.

[Beer Baron]

ratio choice:

version 1

１= ２,６１１　　　　　　　

２=１,７３３　　　　　　　　　

３=１,２８９　　　　　　　　　

４=１,０００　　　　　　　　

５ =０,７５２　　　　　　　　

OR (standard ratios I think?):

１　３,２１４　

２　１,９２5

３　１,３０２　

４　１,０００

5　０,７５２　

They have some optional 5th gear choices too:

5 ０，８４２

5 ０，８２６

5 ０，８００

version 2 close ratio box is:

１　１,９０３

２　１,４７６

３　１,１８６

４　１,０００

５ choice of the 3 above.

[PJ.]

Matty if you haven't already bought a PPG do it. I've had both the OS in my Silvia and PPG dog, I broke two selectors before I bought the PPG and it was the best thing I ever did.

The OS gears are strong but like everyone has mentioned here, rely on factory Nissan parts too, I think you and I have similar driving styles.

As for servicing them, once you get the hang of driving and not crunching them everywhere they are more reasonable than they myths that linger around them given what your use is, street/occasional track.

PJ

[bigmikespec]

^^^ That is some nice stuff Mr Baron!

Anyone got gear sets from Modena Engineering?

[Beer Baron]

i've not tried their skyline stuff. a mate had a modena gear set in another car and it seemed fine but my experience with them in skylines is zero.

the ppg is good but by the time you get new centre plate, billet shafts, billet selectors etc it becomes pretty expensive and of course it still has limitations of being in the factory casing with the factory layout and size limitations etc. my feeling these days is for a road car you either spend a little (good standard box or something like a OS set at most) or for a track car just got straight to the hollinger. it's a lot to cop in one hit but they are fantastic and have a lot of benefits. plus if you need to sell it one day the resale is pretty strong too!

[bigmikespec]

i've not tried their skyline stuff. a mate had a modena gear set in another car and it seemed fine but my experience with them in skylines is zero.

the ppg is good but by the time you get new centre plate, billet shafts, billet selectors etc it becomes pretty expensive and of course it still has limitations of being in the factory casing with the factory layout and size limitations etc. my feeling these days is for a road car you either spend a little (good standard box or something like a OS set at most) or for a track car just got straight to the hollinger. it's a lot to cop in one hit but they are fantastic and have a lot of benefits. plus if you need to sell it one day the resale is pretty strong too!

If I am reading it right the AGY "full monty" is 900,000 YEN?

The syncromesh helical PPG gearset is reasonable at $5-6k but then add billet selectors, bigger input shaft... labour. You are close to $10k already!

[Beer Baron]

yeah it's around $10K but you get full 5 gear close ratio box (version 2) with choice of 5th gear ratio from 3 options, ALL gears come with the upgraded dual cone synchros and you also get an upgraded input shaft (can even get it with the hollinger type spline if you want) and the upgraded billet centre plate is included too. and that price is fully built and installed in casing. for other options like ppg and os etc you need to budget at least $1000 for assembley and that's assuming all the other bits in your box (bearings etc) don't need replacing too.

for a full dual synchro box, with full 5 speed close ratio, upgraded gears and upgraded input shaft all assembled ready to go it's not too bad. still not cheap by any means but it's probably the nicest box option for a road car that does just the odd track day.

you can get the basic version 1 dual cone synchro set with close ratio gears in 1-3 (standard 4th and 5th gear) for half that, but then if you want the optional 5th gear that's another $1,000, billet centre plate, another $1,000, and upgraded input shaft is another $1,000 too. so by the time you buy it and upgrade those 3 bits it's more like $8K. their prices are full installed though too (you exchange your old box).

their stuff is very nice though.

[elrodeo666]

Input shaft is only good for 800hp max if your lucky and if you dont baby it, it will snap !

I know of quite a few street and race cars that have had this and have snapped the input shaft launching it.

It is not designed for drag launches but strictly circuit and street driving!! It is definitely not a drag option box.

But it shifts smooth as silk on the track or street compared to a box with just an OS set.

I have a combo box of the OS gearsets, OS uprated input shaft and AGY double con still sitting in my house in Japan and another box getting built as a spare.

AGY have designed an uprated input shaft but still OS is stronger.

[bigmikespec]

Can you use their syncros with any gear set?

[Beer Baron]

yeah i've had one mix and match with SS690 synchros and the OS 1-3 gearset.

for sure it's not a drag box and not really drag suitable ratios (except maybe the newer v2 ratios) but as I said I'd recommend it for the average 95% street car with the odd 'fun' track day thrown in. not for a competition car. for comp circuit or drag car you may as well go dog box like PJ has or step up again to the hollinger. or hell for a drag car get a 2speed powerglide or a liberty airshifted auto box.

[elrodeo666]

Can you use their syncros with any gear set?

I doubt it more so that the owner Koizumi is a bit of a grump at the best of times and wouldnt want to stuff around with anything thats not in Japan.

yeah i've had one mix and match with SS690 synchros and the OS 1-3 gearset.

for sure it's not a drag box and not really drag suitable ratios (except maybe the newer v2 ratios) but as I said I'd recommend it for the average 95% street car with the odd 'fun' track day thrown in. not for a competition car. for comp circuit or drag car you may as well go dog box like PJ has or step up again to the hollinger. or hell for a drag car get a 2speed powerglide or a liberty airshifted auto box.

Richard these have lunched in high power street / circuit cars in Japan launching hard. One was just over 680hp.

I've personally seen 2 shafts snapped thats why went the OS shaft.

Most people in the know in Japan wont use the shaft if chasing over 650 at atw and go uprated OS shaft.

Costs a lot less to build new box when your earning yen.

By the way where did you get your AGY/OS box from ?

[T04GTR]

correct me if im wrong, nut isnt the series 3 gtr gearbox have double sychros 2,3rd anyway?

[Beer Baron]

yep, you're right dave. S3 boxes have double synchros on 2/3. the AGY kit adds it to 1st, 4th and 5th as well.

Mark, my AGY box was bought from...... AGY. long time ago. maybe 2004.

[elrodeo666]

Good you sold it as the old boxes input shaft was pretty fragile.

Still ok for general street and track but hard launches they snapped fairly easily.

Uprated ones he does now handle more power but still best is the OS/AGY combo.

I love driving the AGY boxes just they just shift so nice.