Jump to content
SAU Community

Piglet's Rebuild Of His Busted Tomei 2.8

Piggaz
 Share

Recommended Posts

Piggaz Grand Master

Piggaz

Posted
  • Author
Posted

http://www.rhdjapan.com/os-giken-6-speed-sequential-transmission-rb26dett.html

Brand: OS Giken
Product: 6-Speed Sequential Transmission RB26DETT
Torque Capacity: 120kgs
Engagement Type (Synchro/Dog): Dog

  • Replies 3.8k
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Popular Posts

Piggaz
Piggaz

Car is finally booked into Insight on the 19th of April for the ECU, fuel system and sensor wire in plus the tune. Thats the good news. The bad news is that V-cam aint gonna fit with my pistons and ho

Piggaz
Piggaz

Small update.... ITS RUNNING. Fired first go! Smells like burnt dust apparently .

Piggaz
Piggaz

A 9174 would just make the EGP pressure issue worse and in my mind it seems like a bit of a GT RS shit going on. Not that it's horrendously bad (It wouldn't be no twin buttplug pressures), That's NOT

Posted Images

Piggaz Grand Master

Piggaz

Posted
  • Author
Posted

Yeah, I've thought about that. Realistically, I'd need both cars at the same time, not to mention the space to do it. I will own a white R34 GTR one day Marko. The whale needs a play mate ;).

  • 2 months later...
Piggaz Grand Master

Piggaz

Posted
  • Author
Posted

Update?

No update. Car is still at my best mates workshop getting the boot seam welded and a few little bits repainted. OS88 should be ordered towards the end of the year. 3-4 month lead time with that though :(.
r33_racer Grand Master

r33_racer

Posted
Posted

We have a Modena in our r33 gtst track car(rb34 680rwhp/1600kg w/driver & fuel). My god it is one of hell of an amazing box. The shifts are quick and positive, up and down with no clutch. 1 year in worth of racing and its still working like brand new. It seems to be handling the power and weight of the car well. Cant say the same for the 3.69 r200 diff though. We have broken one already, stripped teeth off crown wheel.

FYI Modena top gear (6th) ratio is 1:1. The box is also a fair amount lighter then a standard rb25 box. From memory the difference was about 9-10kg.

They can supply input shaft to suit whatever spline you want also, we were already running the chevy spline from the bigger PPG input shaft so they made it the same so we can reuse the clutch.

Also we switched to the Modena from a PPG which we killed several times over. Just couldn't handle the load.

I know not a lot of that is totally relevant to your build thread mate but thought it might be useful for others who are searching for info on potential gearboxes.

Also this is based on racing experience, nothing on the street so I cant comment on how streetable the box may or may not be. The only downside is there is custom mounts to be made, and you need to knock up a shifter mount in the car as its a remote mounted shifter that is independent to the box. It is attached to the box via a short linkage. Then there is the pull cable/lever for the reverse/neutral lock out.

Think I have covered everything that is worth knowing, hopefully it may help someone.

I might have missed in the last few pages but what is an OS88 box worth?

XKLABA Grand Master

XKLABA

Posted
Posted

The Modena box is awesome but I don't think it can be mated to the 4WD transfer case :(

I also think it is straight cut, so it will have the whine to it :(

And a fair bit dearer then the OS88, from memory the Modena was $20k + get stuffed tax :(

r33_racer Grand Master

r33_racer

Posted
Posted

Yeh it does have straight cut gears which do whine abit, but not much worse then a loud exhaust system. But for street driving it wouldn't be the most aurally friendly for sure.

The other issue is the top 1:1 for a street car as you said. We had to find a r200 diff that had a ratio so we could get a reasonable top speed, a s15 diff was used with a 3.69 ratio.

NismoSTune Community Regular

NismoSTune

Posted
Posted

Man..... So nerve racking. I just bought a PPG 1-5 dog box last year and are about to install it this year but when I read stuff like "PPG don't hold up" I get bent out of shape. I dunno what power I'll put down but a guy in the USA with the same head and turbos/intake/exhaust but a 2.6 unlike my 2.8 put down 840whp on e85 (which doesnt sell in this country). Soooo im potentially pooched.

NismoSTune Community Regular

NismoSTune

Posted
Posted

Man..... So nerve racking. I just bought a PPG 1-5 dog box last year and are about to install it this year but when I read stuff like "PPG don't hold up" I get bent out of shape. I dunno what power I'll put down but a guy in the USA with the same head and turbos/intake/exhaust but a 2.6 unlike my 2.8 put down 840whp on e85 (which doesnt sell in this country). Soooo im potentially pooched.

  • 2 months later...
Piggaz Grand Master

Piggaz

Posted
  • Author
Posted

Little bit of an update here.

The os88 will be ordered within the next few days. Just waiting on account details of where to sent the coin and it will be full steam ahead. I ended up going through import monster.

Then the wait begins.

  • Like 1
Piggaz Grand Master

Piggaz

Posted
  • Author
Posted

I believe Exedy do the plate in the centre hub with the larger spline hub. I haven't contacted them yet, but if that's the case I'll buy a new coppermix and go that way. I really don't want to give the coppermix up.

Marko R1 Grand Master

Marko R1

Posted
Posted

Exedy is dreadful, based on running a twin plate in past - yuk

pretty much more brutal than my os giken triple plate & that is saying something

ive never driven a coppermix but that will change when you're back on the road :)

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
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • Kapr
      "Cheap" bolt on turbo on RB25DET NEO

      By Kapr · Posted

      Ok guys thank you very much. GCG highflow it is then 🙂 
    • JC71
      98 R34GTT 4k engine stumble

      By JC71 · Posted

      forgot to mention that when it does this it does not kill the engine, but I have not kept the pedal down long enough to let it, as I see no reason to beat up on it as its got to be something simple, small and dumb causing this.  And as soon as I let off pedal, the engine returns to its normal super smooth operation and rpms re-stabilize quickly, once below 4k. 
    • JC71
      98 R34GTT 4k engine stumble

      By JC71 · Posted

      neither stumble or cut really seem to be an appropriate term....hard to explain its like a rev limiter but at 4k, but it violently shakes engine and entire vehicle as the rpms will not rise over 4k, even with slow acceleration. as soon as it hits 4k, it sounds like entire spark is lost entirely. plugs were 1.1 which I used as such, but later put in new plugs gapped down to .8 changed back after issue arose when I replaced the coils, still does it with either plug gap...damn and it was all running so good.
    • TurboTapin
      Why am I hitting a power wall with my stroked RB25?

      By TurboTapin · Posted

      Oh how times have changed! I actually lean it out relative to my water/methanol injector duty cycle. The methanol adds a lot of fueling and you can then lean it out even more due to reduced knock. 
    • Dose Pipe Sutututu
      Why am I hitting a power wall with my stroked RB25?

      By Dose Pipe Sutututu · Posted

      Yeah my thoughts are the same, a well thought out WMI setup, would be slightly ahead of just straight E85 and you're also chemically intercooling the charged air, dropping it even further. This is why you need to add so much more fuel as soon as you spray. I remember someone taking me through their set up before (Dennis, has a R33, lives around Cabramatta - no idea if he's still around on this forum). He would target AFR 10:1 on 98, then as WMI ramped on, AFR would lean back up to 11:1. Amazingly, he did this all through his PowerFC, a relay to cut power to his EBC solenoid if there was not enough line pressure on his WMI kit. And of course, if there wasn't any boost made above gate pressure, you wouldn't be accessing the load cells with heaps of timing for WMI. One downside to that rudimentary setup, once the WMI came on, the EBC would unleash the dragon, and of course all the timing. Tyres would fry lol.
×
×
  • Create New...