Jump to content
SAU Community

Recommended Posts

OS Giken cross mission gearset, or a PPG straight cut dogbox. The stock box can even last for a 1000HP, but is all a question on how you load up the gearset, do you launch big at the lights, or do some engine breakin. if you could apply load steadily, id sya it would hold a 1000HP. I broke mine with a little more than stock power ( about 350-370HP), sinc ei have built my car i have the cross mission gearset, and redline oil in it, and hast complained yet (and i abuse my car). I also run a EXEDY tripple plate clutch with full face sprung hub plates and a heavy clamp load Pressure plate.

Link to comment
https://www.sau.com.au/forums/topic/139583-stock-gtr-box/#findComment-2602601
Share on other sites

This is great timing cause im looking at doing my gearbox aswel

OSGiken retails for 3k for the 1,2,3 set, plus fitting etc

PAR want $5500 for them to supply and fit their 1,2,3 set into my current box

Havnt got a price from PPG, but would really like to know if they're pricing is competitive or not

The OSGiken seems the way to go so far pricewise, but are they straight cut or helical like the OEM gears?

There's another thread un this same section about stock boxes being rebuilt and the prices for them are around $1200 even with some work done by the owners, so at a guess with labour included, it could be almost $2k, which to me, it a waste as it will just be a freshened up box, not a newer, tougher box, and id just spend the extra bit and go OSGiken :)

Link to comment
https://www.sau.com.au/forums/topic/139583-stock-gtr-box/#findComment-2602646
Share on other sites

I've just rebuilt my box with an OSG cros mission set. I'm seeing around 550 awhp through a 2.8L. I won't have the chance to judge for myself until I'm back in Oz early next year.

I made the choice after speaking to Leewah who runs a hell of a lot power than I ever will. He told me a while back that so far his gearbox has lived up to the abuse he has dealt it.

Dog engagement (helical or straight cut) gears will in theory take more power as the gear face can be widened to take up the space that the syncros once occupied. This comes at a price of increased noise and vibration and an alternative gear changing style, however.

Edited by Gav
Link to comment
https://www.sau.com.au/forums/topic/139583-stock-gtr-box/#findComment-2603532
Share on other sites

And ready for more HP.....correct?

Otherwise, why would OS make them?

......unless they're solely for changing ratios - but even if thats the case, why not upgrade at the same time ? :)

Yeah, i've heard of figures around 800hp. I the Racepace GTR has around that power and runs the OS gearset...

Link to comment
https://www.sau.com.au/forums/topic/139583-stock-gtr-box/#findComment-2605446
Share on other sites

Going through this now and im 99% set on a PPG box.

5 speed dog box with 1000hp mainshaft and they give you the option of the standard input shaft or upgraded hollinger style for the same price. Around $9000 but will hold the power.

Only downside is the noise they make.

Link to comment
https://www.sau.com.au/forums/topic/139583-stock-gtr-box/#findComment-2605893
Share on other sites

Is $9000 what thwey quote for the PPG straight cut? i had imagined it would be like 15k. I am currently building a full drag spec engine, but i thought that a straight cut dog box would be out of the question due to the wads of cash they ask for it. I would just be using my crossmission gearbox and propbly bloow it to bits, mow i just might look into buying that gearset

Link to comment
https://www.sau.com.au/forums/topic/139583-stock-gtr-box/#findComment-2606226
Share on other sites

My mate has a dogbox in his gtr and it sounds mean similer to a electric toy car actually i havnt herd alot about the giken stuff

just to clear one thing up. its the straight cut gears that make the whining noise not the dog engagement. they are only responsible for the 'cha-chunk-crash' as you change gears. i make this distinction as people often assume all dog engagement boxes are straight cut (not the case) or vice versa that all straight cut gearsets run dog rings (also not the case). you can occaisionaly see straight cut/syncrho boxes and some times helical cut dog engagement boxes.

for a car that does street driving an upgraded synchro/helical box is the way to go.

Link to comment
https://www.sau.com.au/forums/topic/139583-stock-gtr-box/#findComment-2606365
Share on other sites

I've got the PAR gearset in mine, with what i believe is a very practical street option, by way of having a straight cut 1st, 2nd & third to handle the punishment & a beefed up Helical 4th but still with Synchro Engagement, they make & supply their own upgraded 1-2 synchro hub, for 3-4 the stocker is oK.

That way you have the strength but still the smooth drivability. uses your stock 5th & reverse gear.

i think he said it will handle 1000hp

sounds awesome too!! (like driving through three gears in reverse), then pull 4th & back to quiet cruising

cost was $5,600

Link to comment
https://www.sau.com.au/forums/topic/139583-stock-gtr-box/#findComment-2607427
Share on other sites

  • 2 weeks later...

just one question:

how hard is it to go into gears in low revs for a dog box?? i do a bit of street driving, so i dont really want a harsh box...noise is fine with me as the car is loud any way....

also, is there any options for street/circuit car which only has around 400awhp?? there is a thing called budget for me,lol..

Link to comment
https://www.sau.com.au/forums/topic/139583-stock-gtr-box/#findComment-2640955
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • So the clockspring is responsible for the indicators cancelling on their own? I thought that was the function of that white thing in the center (any idea what it's called?)
    • Can you log IAT? Whilst WTA coolers have their place, doing any sort of sustained run is not one of them There are fixes that slow down the heat soak, like ice boxes, which don't last that long, and interchillers, which are fairly expensive, up grades to the WTA cooling radiator, which may require a bigger pump, and upgrades to the reservoir size,  and upgrades to the cooling fans, but, it all still heat soaks, and takes ages to come down in hot weather  For a turbo, that isn't locked into WTA like my PD blower is, can you not possibly swap to a nice air to air intercooler????, it would be better for sustained runs then, and have alot less things that could go wrong in my opinion 
    • So, the other thing I've sorted is a baseline dyno run up at Unigroup's new location. The auto trans was a little unco-operative by both shifting down when the throttle was floored on the dyno (so Mark had to ramp it up more slowly than in a manual) and also by shifting up at 6,000 even in sports mode instead of the indicated redline of 7,000 Still, on a hot day it made 240rwkw at 16psi which seems about right for 300kw (400hp) through an auto at the wheels.  The shape of the curve is not quite right because it was not full throttle to about 4,500 to stop it kicking down, but until I can get a tune on the auto trans control this was the best we could do.....full boost will be well below 5,000 once that is sorted, I'll get some data logs when I can to confirm For comparison, the R32 made 255 at 12psi (at 4,500) on the same dyno with tune, n1 turbos, cam gears, big exhaust but otherwise all standard so the v37 is likely a little better out of the box. One thing that is very clear is that the standard water to air intercoolers are not up to sustained use at full throttle in warm ambient temps. After about 5 runs (so only a few minutes full throttle), it was pulling boost and timing and dropping 10-15% power. Unfortunately I didn't get that printout and the Unigroup guys are away at the moment, will try and get hold of it on their return. So, looks like a healthy engine to start modifying and the only real area of concern is the w2a heat exchangers which the aftermarket has plenty of solutions for    
    • I maintain it actually looked really nice in person. So much so that I thought "No, this is illegal" but there it was, clear as day. I think we can easily call the wing and wheels/height to be transformative. Not saying it's better than the GR Whatever, or the 86, or the WRX STI or anything of that sort (the internet says it all bolts up so you can buy best of all worlds?) but it's still at least a thing and not nearly AS bad as people say.
    • That's less offensive than the previous gen.....except for all that ugly black tupperware around the edges. Blerck!
×
×
  • Create New...