Not Sure If What I Heard Is Correct Is Os Giken 5 Speed Top Speed Slower Then Oem 5Th

[GTRAAH]

WHat is the Top speed difference in the GTR Os Giken 5 speed and the OEM 5th Gear Is it much difference? I

Edited July 15, 2012 by GTRAAH

[Piggaz]

At 8000 RPM the standard 5th goes to 310, the OS goes to 290... Give or take a little due to tyres and whatnot.

[GTRAAH]

Im thinking of putting a new OEM 5th in mine as I would have to re-open the box again...Have you ever heard of a OEM 5th gear snapping in a 700hp car cause this is my goal HP Or even snapping at all. I dont understand why hey made it shorter if it doesnt affect the 1/4 time and slows the top speed. What is the point of it being shorter

[GTRAAH]

is it possible to change something else in the car to get it up in the top speed ? diff ? I have a 320 speedo and Im the type that actually wants it to do that if there was enough road, Even if I wouldnt do it It would stay on my mind like a lie staring at me LOOL. ANd no I dont want to change the speedo i like it

[GTSBoy]

You could put a ~3.7 Silvia CW&P in there. That will give you ~11% back on your top end. But it will also lengthen every other gear, which might gay it up a little.

But really, now you are just playing with yourself. There's no real chance of you ever exploring the top end speed difference between the two 5ths, at least not safely. If you tried to do it on Conrod straight you'd almost certainly kill yourself at the chase, and if you tried to do it on a public road, you're insane.

[Piggaz]

I dont understand why hey made it shorter if it doesnt affect the 1/4 time and slows the top speed. What is the point of it being shorter

The box is 'close ratio' box. That's why first is taller. You don't drop as many rpm between changes.

There's not many places where you would full noise in 5th gear. Eastern Creek main straight maybe and Phillip Island straight. Put at stock 5th gear in, it will be fine. Also, buy the OS Giken centre plate.

[GTRAAH]

Sorry but im not that mechanicaly smart, What does a Centre plate do?

[GTSBoy]

The centreplate is the central plate of the gearbox. Carries the main shafts in bearings. The front and rear housings are hung off the centreplate. The OS Giken one is stiffer, and therefore better.

[tricstar]

yeah just put the standard 5th gear on it, I have done the same and with 600+rwhp had no issues with 5th, makes for a better cruising rev. I certainly wouldn't change the diff, 1st gear is tall enough ! plus you'd have to do the front too !

if you are chasing decent power the centre plate could be good insurance, if I have anymore problems with front to back movement of the main shaft I'll be forced to get one.

[GTRAAH]

Thanks......WHere can I get pricing on a Os Giken Centre plate ? Expensive?

Edited July 16, 2012 by GTRAAH

[Piggaz]

Greenline.

I received mine 5 days after payment.

They're roughly $1,000.

[R31Nismoid]

I know 2 people that have busted a stock 5th @ Philip Island...

Leave the OS one.

[GTRAAH]

Thanks........... Ok might leave it in but seriously So The OS one wont reach 300Km? .... AWWW so I wont be in the 300 Club lool

[Piggaz]

Where on earth do you plan on doing 300?

Bump the RPM limit up by 500. Problem solved.

[tricstar]

I know 2 people that have busted a stock 5th @ Philip Island...

Leave the OS one.

Buggar.

Lucky I kept the OS one. Although I only touch 5th briefly down the back straight at barbagallo...

For the sake of argument wouldn't you just need rev 5th out to, say 8200 to see 300 ?

[GTRAAH]

@R31Nismoid you know the people that broke 5th did they have a center plate in there? I am just wondering if that would of stopped it from braking

[GTRAAH]

I always thought my limiter was at 9000rpm So maybe thats not right 0.o

[R31Nismoid]

Buggar.

Lucky I kept the OS one. Although I only touch 5th briefly down the back straight at barbagallo...

For the sake of argument wouldn't you just need rev 5th out to, say 8200 to see 300 ?

It's more reaching the top end of 4th... Put into 5th, get back on the power - and POP goes the weasel. They are not really designed to be having max load put on them being an overdrive gear which would be more of a problem than the actual RPM.

[NXTIME]

Thanks......WHere can I get pricing on a Os Giken Centre plate ? Expensive?

Greenline.

I received mine 5 days after payment.

They're roughly $1,000.

Ryan1200 is selling one in the classifieds section for $650 used...