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15-02-2010, 05:29 AM
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#1 | ||
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Just slidin'
Join Date: Sep 2005
Location: Brisvegas
Posts: 7,791
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I dont have an XR8, but I have an auto 6. I went from 3.08's to 3.91's and its probably the best mod Ive done, sits around the 2200-2250 mark @ 100km/h, I get around 11L/100km normal driving, only bad thing is the speedo is out by a long way. Feels a lot better in every gear at every RPM.
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MD Mondeo - For the family
NP Pajero - For the adventure |
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15-02-2010, 07:26 AM
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#2 | ||
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Just another mock-up..
Join Date: Sep 2006
Location: In an AU Fairlane somewhere...
Posts: 9,966
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yeah 3.9's would be a great set of gears for an auto XR8..
it'll bring the beast to life... take off will be dramatically better, but as monty said, it'll rev a bit higher at 100km/h.. you can get the speedo corrected to match the gearing so your speedo won't be out at all..
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Desire isn't driven by the heart, the mind or the wallet. Desire comes from another place. It's created by the smell of burnt fuel under full throttle and the look a car gives you when you're washing it alone at night... see my car here: Built my own TL50!!! [SIGPIC][/SIGPIC]
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15-02-2010, 07:58 AM
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#3 | ||
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Donating Member
 Join Date: Aug 2006
Posts: 5,142
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Now youre all giving me ideas fellas.
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15-02-2010, 08:51 AM
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#4 | ||
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FF.Com.Au Hardcore
Join Date: Dec 2008
Posts: 1,566
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Nah can't tune it, you can buy an electronic chip to alter speed at the ecu from jaycar or go to an auto electrician
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Current Blueprint 03 xr8  5 speed manual, Difilippo Quad Big Boy system, BPR CAI, BPR Custom tune, Underdrives 256rwkw   BA manual Typhoon Fully optioned, 340rwkw@16psi (thanks Bluepower)! The old ride.... AU Fairmont, cammed beast, R.I.P you made my p plate years bearable! 150.8rwkw courtesy BPR |
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15-02-2010, 10:31 AM
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#5 | ||
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Now Fordless
Join Date: Aug 2005
Location: Fremantle, WA
Posts: 3,611
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I had 3.9s put in a couple of months ago. Factory ratio is 3.45. Day to day driving is where you notice I thought. Just moves along easier. Feels a lot more suited to the engine.
Revs at about 2400 at 100km/h. |
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15-02-2010, 10:34 AM
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#6 | ||
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FF.Com.Au Hardcore
Join Date: Jun 2007
Posts: 3,408
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How much worse is fuel economy and would 3.73 be the best all rounder for street and highway for a a speed???
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Wanted Either Capri/Cortina/XY/XW/XR/XT with tough V8 stroker engine, auto, 9inch, upgraded brakes etc |
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15-02-2010, 12:21 PM
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#7 | ||
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FF.Com.Au Hardcore
Join Date: Dec 2008
Posts: 1,566
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I would be game enough to use 4.11s if I ever had another chance the economy improved around town and on the hwy it was probably another 2-3L/100 from a car with very good economy to begin with
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Current Blueprint 03 xr8 5 speed manual, Difilippo Quad Big Boy system, BPR CAI, BPR Custom tune, Underdrives 256rwkw BA manual Typhoon Fully optioned, 340rwkw@16psi (thanks Bluepower)! The old ride.... AU Fairmont, cammed beast, R.I.P you made my p plate years bearable! 150.8rwkw courtesy BPR |
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15-02-2010, 12:50 PM
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#8 | ||
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Critical Thinker
Join Date: Jan 2005
Location: Adelaide
Posts: 20,387
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anyone have an idea what a diff gear change would cost?
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"the greatest trick the devil pulled, is convincing the world he doesn't exist" 2022 Mazda CX5 GTSP Turbo 2018 Hyundai Santa Fe Highlander 1967 XR FALCON 500 Cars previously owned: 2021 Subaru Outback Sport 2018 Subaru XV-S 2012 Subaru Forester X 2007 Subaru Liberty GT 2001 AU2 75th Anniversary Futura 2001 Subaru GX wagon 1991 EB XR8 1977 XC Fairmont 1990 EA S Pak 1984 XE S Pak 1982 ZJ Fairlane 1983 XE Fairmont 1989 EA Falcon 1984 Datsun Bluebird Wagon 1975 Honda Civic |
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15-02-2010, 01:36 PM
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#9 | ||
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Donating Member
Join Date: Aug 2006
Posts: 5,142
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^^ Up here ive been quoted roughly 1000 bucks fitted.
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15-02-2010, 01:45 PM
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#10 | ||
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Critical Thinker
Join Date: Jan 2005
Location: Adelaide
Posts: 20,387
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Thanks Scotty85. I assume thats a new gear set and not second hand? Does it come with new bearings etc, or is that just the labour only?
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"the greatest trick the devil pulled, is convincing the world he doesn't exist" 2022 Mazda CX5 GTSP Turbo 2018 Hyundai Santa Fe Highlander 1967 XR FALCON 500 Cars previously owned: 2021 Subaru Outback Sport 2018 Subaru XV-S 2012 Subaru Forester X 2007 Subaru Liberty GT 2001 AU2 75th Anniversary Futura 2001 Subaru GX wagon 1991 EB XR8 1977 XC Fairmont 1990 EA S Pak 1984 XE S Pak 1982 ZJ Fairlane 1983 XE Fairmont 1989 EA Falcon 1984 Datsun Bluebird Wagon 1975 Honda Civic |
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15-02-2010, 01:50 PM
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#11 | ||
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Donating Member
Join Date: Aug 2006
Posts: 5,142
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thats new gears fitted, unsure about additional components such as bearings, etc.
EDIT: I just realised that the price MAY be closer to something like 1800 for new gears. Im not sure as i also got a quote for diff repairs around the same time. Sorry as that is a significant price difference. :( |
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15-02-2010, 01:53 PM
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#12 | ||
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Critical Thinker
Join Date: Jan 2005
Location: Adelaide
Posts: 20,387
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Ok, so it sounds like it depends on the mob doing it. There is no real gauge as to what the price may be. Probably best to discuss with the diff mob prior to booking anything in.
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"the greatest trick the devil pulled, is convincing the world he doesn't exist" 2022 Mazda CX5 GTSP Turbo 2018 Hyundai Santa Fe Highlander 1967 XR FALCON 500 Cars previously owned: 2021 Subaru Outback Sport 2018 Subaru XV-S 2012 Subaru Forester X 2007 Subaru Liberty GT 2001 AU2 75th Anniversary Futura 2001 Subaru GX wagon 1991 EB XR8 1977 XC Fairmont 1990 EA S Pak 1984 XE S Pak 1982 ZJ Fairlane 1983 XE Fairmont 1989 EA Falcon 1984 Datsun Bluebird Wagon 1975 Honda Civic |
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15-02-2010, 01:58 PM
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#13 | |||
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Donating Member
Join Date: Aug 2006
Posts: 5,142
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Quote:
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15-02-2010, 03:03 PM
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#14 | |||
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Regular Member
Join Date: Nov 2008
Location: brisvegas
Posts: 59
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Quote:
Yeah i have a T3 TS50 and a new diff in that was around the $1800 mark its a very good idea to ring a few places and get quotes first but be sure to use a reputable workshop to do the work You dont want to be pulling third gear and have a million pieces fly out through shonky workmanship hope that helps stu |
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15-02-2010, 05:20 PM
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#15 | ||
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FF.Com.Au Hardcore
Join Date: Dec 2008
Posts: 1,566
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They can't correct it at a mechanics as you only get gear synchros for up to 3.45 as that's the shortest factory gearing
some might install the jaycar kit or you could do it yourself
__________________
Current Blueprint 03 xr8 5 speed manual, Difilippo Quad Big Boy system, BPR CAI, BPR Custom tune, Underdrives 256rwkw BA manual Typhoon Fully optioned, 340rwkw@16psi (thanks Bluepower)! The old ride.... AU Fairmont, cammed beast, R.I.P you made my p plate years bearable! 150.8rwkw courtesy BPR |
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23-02-2010, 10:20 AM
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#16 | ||
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Now Fordless
Join Date: Aug 2005
Location: Fremantle, WA
Posts: 3,611
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Nah it doesnt change a thing. Mine still shifts the same. WA diffs who did mine said they never had an issue with any and they've done a few.
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23-02-2010, 05:16 PM
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#17 | ||
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Just slidin'
Join Date: Sep 2005
Location: Brisvegas
Posts: 7,791
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Yeah, shifts wont change at all. I havent had my speedo corrected.
__________________
MD Mondeo - For the family
NP Pajero - For the adventure |
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23-02-2010, 07:44 PM
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#18 | ||
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Now Fordless
Join Date: Aug 2005
Location: Fremantle, WA
Posts: 3,611
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Same I just left my speedo. I've worked out roughly what im doing at different speeds on the speedo. If I really want to know I just check the GPS.
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What the diff?
Linear Mode
