Marco-R34GTT Posted January 20, 2008 Author Share Posted January 20, 2008 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?? Link to comment https://www.sau.com.au/forums/topic/201626-6-speed-getrag-into-a-gtt/page/2/#findComment-3592555 Share on other sites More sharing options...
heller44 Posted January 20, 2008 Share Posted January 20, 2008 350z.. 0.794 gtt.. 0.752 Link to comment https://www.sau.com.au/forums/topic/201626-6-speed-getrag-into-a-gtt/page/2/#findComment-3592575 Share on other sites More sharing options...
GTS20X Posted January 20, 2008 Share Posted January 20, 2008 The cheapest & easiest way to drop the rpm a small amount would be to fit taller rear tyres. Link to comment https://www.sau.com.au/forums/topic/201626-6-speed-getrag-into-a-gtt/page/2/#findComment-3592825 Share on other sites More sharing options...
Marco-R34GTT Posted January 20, 2008 Author Share Posted January 20, 2008 350z.. 0.794gtt.. 0.752 HHmmmmmm, what sort of a difference would that yield??? 150/200rpm??? Link to comment https://www.sau.com.au/forums/topic/201626-6-speed-getrag-into-a-gtt/page/2/#findComment-3593051 Share on other sites More sharing options...
PT Posted January 21, 2008 Share Posted January 21, 2008 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) Link to comment https://www.sau.com.au/forums/topic/201626-6-speed-getrag-into-a-gtt/page/2/#findComment-3593606 Share on other sites More sharing options...
Angus Smart Posted January 21, 2008 Share Posted January 21, 2008 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! Link to comment https://www.sau.com.au/forums/topic/201626-6-speed-getrag-into-a-gtt/page/2/#findComment-3593644 Share on other sites More sharing options...
Marco-R34GTT Posted January 21, 2008 Author Share Posted January 21, 2008 (edited) 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 January 21, 2008 by Marco-R34GTT Link to comment https://www.sau.com.au/forums/topic/201626-6-speed-getrag-into-a-gtt/page/2/#findComment-3593836 Share on other sites More sharing options...
heller44 Posted January 21, 2008 Share Posted January 21, 2008 (edited) 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.com.au/z/specifications.asp Edited January 21, 2008 by heller44 Link to comment https://www.sau.com.au/forums/topic/201626-6-speed-getrag-into-a-gtt/page/2/#findComment-3594578 Share on other sites More sharing options...
Marco-R34GTT Posted January 21, 2008 Author Share Posted January 21, 2008 Even without the box swap, would the Zed's diff fit on the GTT with some modification??? Link to comment https://www.sau.com.au/forums/topic/201626-6-speed-getrag-into-a-gtt/page/2/#findComment-3594581 Share on other sites More sharing options...
casuarina26 Posted January 24, 2008 Share Posted January 24, 2008 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 Link to comment https://www.sau.com.au/forums/topic/201626-6-speed-getrag-into-a-gtt/page/2/#findComment-3601471 Share on other sites More sharing options...
R31Nismoid Posted January 25, 2008 Share Posted January 25, 2008 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 Link to comment https://www.sau.com.au/forums/topic/201626-6-speed-getrag-into-a-gtt/page/2/#findComment-3602840 Share on other sites More sharing options...
Marco-R34GTT Posted January 25, 2008 Author Share Posted January 25, 2008 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.. Link to comment https://www.sau.com.au/forums/topic/201626-6-speed-getrag-into-a-gtt/page/2/#findComment-3603136 Share on other sites More sharing options...
casuarina26 Posted January 25, 2008 Share Posted January 25, 2008 (edited) Check out this on eBay http://cgi.ebay.com.au/3-45-ratio-diff-gea...0QQcmdZViewItem Edited January 25, 2008 by casuarina26 Link to comment https://www.sau.com.au/forums/topic/201626-6-speed-getrag-into-a-gtt/page/2/#findComment-3604065 Share on other sites More sharing options...
Marco-R34GTT Posted January 25, 2008 Author Share Posted January 25, 2008 That diff witht he 350Z box would be perfect... Link to comment https://www.sau.com.au/forums/topic/201626-6-speed-getrag-into-a-gtt/page/2/#findComment-3604102 Share on other sites More sharing options...
dead32 Posted January 25, 2008 Share Posted January 25, 2008 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 Link to comment https://www.sau.com.au/forums/topic/201626-6-speed-getrag-into-a-gtt/page/2/#findComment-3604347 Share on other sites More sharing options...
Marco-R34GTT Posted January 25, 2008 Author Share Posted January 25, 2008 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.... Link to comment https://www.sau.com.au/forums/topic/201626-6-speed-getrag-into-a-gtt/page/2/#findComment-3604640 Share on other sites More sharing options...
rockabilly Posted January 25, 2008 Share Posted January 25, 2008 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 Link to comment https://www.sau.com.au/forums/topic/201626-6-speed-getrag-into-a-gtt/page/2/#findComment-3604679 Share on other sites More sharing options...
Duncan Posted January 26, 2008 Share Posted January 26, 2008 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. Link to comment https://www.sau.com.au/forums/topic/201626-6-speed-getrag-into-a-gtt/page/2/#findComment-3605563 Share on other sites More sharing options...
Marco-R34GTT Posted January 26, 2008 Author Share Posted January 26, 2008 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.. Link to comment https://www.sau.com.au/forums/topic/201626-6-speed-getrag-into-a-gtt/page/2/#findComment-3605825 Share on other sites More sharing options...
Marco-R34GTT Posted January 29, 2008 Author Share Posted January 29, 2008 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 Link to comment https://www.sau.com.au/forums/topic/201626-6-speed-getrag-into-a-gtt/page/2/#findComment-3610128 Share on other sites More sharing options...
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