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6 Speed Getrag Into A Gtt


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Ok...

I wonder what the sixth gear ratio from the 350Z is in comparison to the fifth gear from the GTT...

If it is no taller then it kinda compromises my goal of a 'cruise' gear... I mean even a gain of a coouple of hundred rpm would suffice...



Where can I find some stats on the gear ratios from both the 350Z and the GTT??

Posted 20 January 2008 - 06:13 PM

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350z.. 0.794
gtt.. 0.752

Posted 20 January 2008 - 06:24 PM


The cheapest & easiest way to drop the rpm a small amount would be to fit taller rear tyres.

Posted 20 January 2008 - 09:01 PM


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350z.. 0.794
gtt.. 0.752


HHmmmmmm, what sort of a difference would that yield??? 150/200rpm???

Posted 20 January 2008 - 11:44 PM

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But the 6spd is going to be a close ratio box so you can run a lower final drive (ie 3.69) in the diff and still have good acceleration, yet 6th gear will be at much lower RPM on the highway even if 6th is near/same ratio as 5th in a 5spd. 9as opposed to 5spd with 4.11)

Posted 21 January 2008 - 11:32 AM


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If thats all you want to do is lower the revs while country driving a diff is surely going to be a cheeper option.

as for those who say the 34 getrag is weak? i'd like to know where you saw that!

Posted 21 January 2008 - 11:50 AM


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But the 6spd is going to be a close ratio box so you can run a lower final drive (ie 3.69) in the diff and still have good acceleration, yet 6th gear will be at much lower RPM on the highway even if 6th is near/same ratio as 5th in a 5spd. 9as opposed to 5spd with 4.11)


Is the Zed's final drive 3.69 is it???

So what RPM difference would I acquire with 6th gear and the Zed box compared to 5th in my GTT box?

Edited by Marco-R34GTT, 21 January 2008 - 04:34 PM.

Posted 21 January 2008 - 01:10 PM

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HHmmmmmm, what sort of a difference would that yield??? 150/200rpm???


Wrong way matey. Zed box will make it rev higher at 110.

Looking at it, even dropping in 3.9:1 diff gears will be the only way to do it nicely (hopefully the speedo can be corrected with the speedo sender cog or something else) but even then its only about ~150rpm difference.. If you were looking for an increase in fuel economy i'd be looking somewhere else.

As an aside, I don't really mind the 4.375:1's in my car at highway speeds.

aussie zed specs.. http://www.nissan.co...cifications.asp

Edited by heller44, 21 January 2008 - 06:12 PM.

Posted 21 January 2008 - 06:10 PM


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Even without the box swap, would the Zed's diff fit on the GTT with some modification???

Posted 21 January 2008 - 06:12 PM

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Changing the Diff ratio would be the easiest. Prior to owning my R34 GT I had 2 commodores a black manual & a white auto (4 speed), both had the same diff ratio (3.08:1), the black manual at 110 kph sat on 2500 rpm where as the white auto at 110 kph sat at 2000 rpm, I did some research and found that the auto top gear was 0.70:1 & the manual 5th gear is 0.81:1. Now the Skyline 5th gear is in between the commodore at 0.759:1 with a 4.111 diff ratio.

So looking at it if you can get 3.08 diff ratio it should give you say 110kph @ 2250rpm or there abouts

Hope this can help,
Phillip :D

Posted 24 January 2008 - 04:08 PM

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Dont forget also the R34GTR Diff's are a very different to accommodate the 6 speed's closer gearing.
So with a factory GT-t ratio diff, its going to be a bit silly with 4.11's

Posted 25 January 2008 - 10:28 AM

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Yeah, thats got me thinking...

Obviously with the Zed's six speed box, and the GTT final drive, of course the revs would be higher..
However, if I manage to use the Zed's box with the equivalent ratio diff....

What I'd like to find out, if anyone here drives a 350Z, is what RPM they do at 120kph... Then I'd know whether the drivetrain would be suitable or not..

Posted 25 January 2008 - 12:55 PM

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Check out this on eBay

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Edited by casuarina26, 25 January 2008 - 06:43 PM.

Posted 25 January 2008 - 06:42 PM

Nissan Skyline R34 GT-V. For Skyline enthusiasts on a budget.......

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That diff witht he 350Z box would be perfect...

Posted 25 January 2008 - 07:10 PM

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convert it to a girlie box *auto*. it'll give you a nice overdrive and you could have it shift kitted so that when you wana give it some stick it'll do the job.
or wait auto's are heavier on the juice :S

Posted 25 January 2008 - 09:42 PM

QUOTE(Roy @ 16 Jun 2007, 12:19 PM) View Post
People who put RB25s in R32 GTSts are the same sorts of people who would sleep with their girfriend's mates. If you put an RB26 in it, at least you have the excuse that she is a good sort :)


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I mean no malice when I say this...

But I'd rather torch my car than convert it to auto, I had an Auto N/A VL crumbledore and I will never drive another auto again....

Posted 26 January 2008 - 01:16 AM

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just to help guys. the 32/33 5th gear is .83.
whereas the 34gtr 6th is .79
but the 32/33 rear diff is 4.11.1
the 34gtr rear diff is 3.45.1
hence the lower revs on the 34.
i am led to believe the reason nissan used the getrag box was to decrease the gaps between gears, hence quicker acceration as you are in the boost range more.. bernie

Posted 26 January 2008 - 03:13 AM


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350z doesn't really rev that low at 100, I'll check next time Kel lets me drive it, but it feels like 6th in the z = 5th in the stagea, so its no better. I think the z box is shorter in 1-4, i never use 5th and 6th like i said the same as 5th in other cars.

anway....diff is the simplest way to lower the overall revs.

Posted 26 January 2008 - 08:35 PM


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Yeah I realise that, I'm just hoping not to entirely kill the acceleration either... Shorter ratios allow for sharper acceleration whilst the taller final drive will allow me some scope to 'cruise' in top gear...
If that makes sense, sry, I'm posting after a very big aussie daayy..

Posted 27 January 2008 - 02:29 AM

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Ok Folks, I asked Yo-Yo, who owns both an R34 GTT and a 350Z to take both for a spin and see what RPM's both cars achieved @ 110kph.

Here are the results for anyone who is interested...

Hi mate,
Got around to seeing the rpms for ya:
GT- T: 2,900RPM @ 110km/h (5th gear)

350 Z: 3,000RPM @ 110km/h (5th gear)
2,400RPM @ 110km/h (6th gear)

Good luck with the eventual conversion
hope that helps;

PJ


Posted 29 January 2008 - 05:16 PM

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