R34 Gtr Build

[Miguelone]

Hey Ian .

No it's not the 3L it's the os88 os giken sequential gearbox.

[BOBBYr34]

you got that quick.

air freight or was it in oz?

Yes air freight special order

[Roy]

Be interesting to see how you go with the OS Giken box. A friend had a twin T67 R32 GTR with a Trust box that went bang so was replaced with the OS Giken sequential that also went bang. He was making something bonkers like 600rwkws from memory. He gave up on having that much power after the box problems with some of the thinking being that it was part shifting with all 4 wheels blazing in lower gears hurting what I think was 3rd gear. He was running a Fcon so wasnt running ignition cut which I think would make a big difference

[BOBBYr34]

Be interesting to see how you go with the OS Giken box. A friend had a twin T67 R32 GTR with a Trust box that went bang so was replaced with the OS Giken sequential that also went bang. He was making something bonkers like 600rwkws from memory. He gave up on having that much power after the box problems with some of the thinking being that it was part shifting with all 4 wheels blazing in lower gears hurting what I think was 3rd gear. He was running a Fcon so wasnt running ignition cut which I think would make a big difference

Thanks for the advise.

Gearbox breaking is always the case in every high powered Gtr. Ignition cut does help however im trying to go the next step is having sensors in the gearbox for ignition cut to occur when the dog gears are lined up. Motec have done it with Hollinger so ill find out more and get back to you 8)

[gtraaron]

Why not Hollinger rather than os box ?

[BOBBYr34]

Why not Hollinger rather than os box ?

Both gearboxes are very similar however different in price.

Os was cheaper

[GTRNUR]

I have heard that the Hollinger is usually paired with an R32 GTR transfer case when installed in a GTR. The later model transfer cases are somehow different, and doesn't apparently easily (possibly at all) adapt to the R33/R34 transfer cases. (The person that told me this might have not had all the facts too, as seems to be typical for most high end GTR stuff)

I would imagine that becase of this difference, and how the R32 GTR doesn't run a preload on the transfer case it would also make the AWD system slower to respond. Perhaps potentially making the car a little more prone to power over steer compared to the r33/r34's tendancy to understeer. It realyl would be interesting to know if there is a difference. Ive always prefered the R32 to drive to the R33/R34's.

Internal sensor switches that detect when the selector forks are fully in the engaged position is definatly the way to go too. By enabling an ignition cut at the start of the shift and re-enabling ignition when fully engaged you will get the fastest possible reliable shift. Potentially faster than a fixed delay too. Safe shift speeds could vary at low RPM and road speeds vs high RPM and high road speeds, not to mention lubrication viscosity, temperature etc.

If the OS88 is a no hasle direct bolt in, there is no question as to which way to go. One of these is definatly on my wish list.

[Risking]

The Hollinger RB26 transmission will bolt up to any of the GTR transfer cases. There is slight internal clutch differences 32,33&34 but the overall principal is the same.

We've removed hollingers from 32's and swapped them straight into 34's using the 34 transfer case.

Same deal applies with the OS88.

Bobby have you looked into the Motorsport systems strain gauges.

I know touring cars guys who have done what you are contemplating with hollingers and they reverted back to one of Anthony's shifters for shear reliability and simplicity.

[gtraaron]

I have heard that the Hollinger is usually paired with an R32 GTR transfer case when installed in a GTR. The later model transfer cases are somehow different, and doesn't apparently easily (possibly at all) adapt to the R33/R34 transfer cases. (The person that told me this might have not had all the facts too, as seems to be typical for most high end GTR stuff)

I would imagine that becase of this difference, and how the R32 GTR doesn't run a preload on the transfer case it would also make the AWD system slower to respond. Perhaps potentially making the car a little more prone to power over steer compared to the r33/r34's tendancy to understeer. It realyl would be interesting to know if there is a difference. Ive always prefered the R32 to drive to the R33/R34's.

Internal sensor switches that detect when the selector forks are fully in the engaged position is definatly the way to go too. By enabling an ignition cut at the start of the shift and re-enabling ignition when fully engaged you will get the fastest possible reliable shift. Potentially faster than a fixed delay too. Safe shift speeds could vary at low RPM and road speeds vs high RPM and high road speeds, not to mention lubrication viscosity, temperature etc.

If the OS88 is a no hasle direct bolt in, there is no question as to which way to go. One of these is definatly on my wish list.

[Risking]

The idea of ignition cut isn't to kill ignition for the entire gear change either.

You only need to cut ignition to release the load between the dogs & engagement rings so you can actually pull the box out of gear.

Physically selecting the next gear with power applied to the engine isn't an issue at all.

Knowing when the selector is fully engaged is irrelevant, you only need to know when the gear is about to be disengaged. Strain gauges do the best job as they can anticipate the upcoming gear change by the force being applied to the stick and the Rate it's being applied (fast gear change vs slow gear change requires a different cut time for the time it takes to disengage the gear)

Hollingers old school micro switch "rocker knobs" are just an on/off switch that indicates the stick is being pulled and leaves the cut time to the ecu. It's a constant cut time and doesn't take Into account how hard and quickly the change is being attempted.

[BOBBYr34]

The Hollinger RB26 transmission will bolt up to any of the GTR transfer cases. There is slight internal clutch differences 32,33&34 but the overall principal is the same.

We've removed hollingers from 32's and swapped them straight into 34's using the 34 transfer case.

Same deal applies with the OS88.

Bobby have you looked into the Motorsport systems strain gauges.

I know touring cars guys who have done what you are contemplating with hollingers and they reverted back to one of Anthony's shifters for shear reliability and simplicity.

Hollinger and Os88 gearbox only fits an R32 or R33 transfercase as the R34 transfer case as a different bolt pattern.

Can you send me Anthony's details and ill call Motec to find out pros and cons about the exact setup

[BOBBYr34]

I have heard that the Hollinger is usually paired with an R32 GTR transfer case when installed in a GTR. The later model transfer cases are somehow different, and doesn't apparently easily (possibly at all) adapt to the R33/R34 transfer cases. (The person that told me this might have not had all the facts too, as seems to be typical for most high end GTR stuff)

I would imagine that becase of this difference, and how the R32 GTR doesn't run a preload on the transfer case it would also make the AWD system slower to respond. Perhaps potentially making the car a little more prone to power over steer compared to the r33/r34's tendancy to understeer. It realyl would be interesting to know if there is a difference. Ive always prefered the R32 to drive to the R33/R34's.

Internal sensor switches that detect when the selector forks are fully in the engaged position is definatly the way to go too. By enabling an ignition cut at the start of the shift and re-enabling ignition when fully engaged you will get the fastest possible reliable shift. Potentially faster than a fixed delay too. Safe shift speeds could vary at low RPM and road speeds vs high RPM and high road speeds, not to mention lubrication viscosity, temperature etc.

If the OS88 is a no hasle direct bolt in, there is no question as to which way to go. One of these is definatly on my wish list.

Am using a R32 gtr transfer case however going to run more preload so its similar to a R34 gtr transfer case.

[Risking]

Motorsport systems

Anthony 02 9890 5544

[GTRNUR]

Thanks for sharing Bobby and Brad. Accurate information about this sort of thing is often hard to come by.

[black bnr32]

so...hollinger bolts to the r34 trans or not? risking says yes, bobby says no.

[BOBBYr34]

so...hollinger bolts to the r34 trans or not? risking says yes, bobby says no.

Bolts up only to a R32 or R33 transfer case or you can modify the R34 transfer case to suit ( not sure what needs to be done for it to fit)

[BOBBYr34]

Motor build is complete , will be delivered to me late next week. Finally!!!!!!!!

[NYTSKY]

Didnt take that long at all......

[mattye]

Pics or it didn't happen

[BOBBYr34]

Didnt take that long at all......

Nope not long at all 5 years and 2 months and alot of grey hair lol