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07-08-2007, 02:15 PM
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FF.Com.Au Hardcore
Join Date: May 2007
Location: Perth
Posts: 585
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is 4.11 diff gears okay to run on a Au2 XR8. i bought some cheap diff gears that are in good condition and am unsure whether it would be okay for road use and if it will change my fuel economy and max speed too much. i wanted a reasonable gain in acceleration and have a fast quarter mile car.
what do you guys think? will it be okay? cheers chris |
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07-08-2007, 02:22 PM
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FF.Com.Au Hardcore
 
Join Date: Dec 2004
Posts: 12,083
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I run 4.11's on my AU XR6. Love them.
__________________
Older, wiser, poorer. Now in Euro-Trash. VW Coupe V6 4motion.
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07-08-2007, 02:44 PM
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FF.Com.Au Hardcore
Join Date: Sep 2006
Posts: 2,981
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If you do a lot of highway driving it might not be so great economy wise, and the top speed will still be well over the legal limit. If you already have them just fit them, give it a month and if you're not happy revert back. At most it will only take a couple of hours to fit them.
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07-08-2007, 02:44 PM
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#4 | ||
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BrwnBstd
Join Date: May 2006
Posts: 746
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If you are often driving at 110, this will use extra fuel, but around town it will make less of a difference.
The acceleration impact is great off the line, and made second gear a lot more usable around town. I went from 3.23 to 3.91 and am happy with the new ratio. |
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07-08-2007, 03:35 PM
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#5 | ||
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Moderator
  
Join Date: Feb 2005
Location: Kenthurst
Posts: 40,403
 
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I wanna get rid of the crappy 3.23s and go 3.7s in the ute ... I dunno how some people put up with 3.08s though. LSD would be nice as well.
It'll really help when pulling decent loads ... and help the auto out tremndously ... I guess I'd need to redial my cam as well.
__________________
The Current Stable 2016 SZII TS Territory RWD Petrol The Evolution of the EGA54D utes AU Workshop Build thread of EGA54D B-Series Workshop Build thread of EGA54D 2004 SX TX Territory AWD - Gone but not forgotten 2010 FG XT "The ex-rental" - Moved onto a new home Mechan1k's Flickr Page |
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07-08-2007, 04:51 PM
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#6 | ||
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drive it like u stole it
Join Date: Mar 2007
Location: Werribee
Posts: 103
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i was thinking about putting 4.11 into my xr6 ute, and now at 100ks it sits at around 2200, wat would it jump upto with the 4.11, also its a manual
__________________
www.aufalcon.com/phibza |
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07-08-2007, 04:55 PM
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#7 | ||
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BrwnBstd
Join Date: May 2006
Posts: 746
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2200 * 4.11 / OLDRATIO = new revs
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07-08-2007, 05:05 PM
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#8 | ||
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FF.Com.Au Hardcore
Join Date: Feb 2005
Posts: 1,558
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I don't know about putting 4.11's in a manual car. I have 3.7's in mine and I find even that is too short, first gear is basically useless. Taking off at anything but snail pace usually results in wheel spin. Also, in fifth gear at 100km/h my 6 cylander revs at between 2300 and 2400rpm.
I am even considering going back to 3.45 diff gears. This is just in my limited experience with a manual. Not sure what other manual owners run in their cars. Evan |
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07-08-2007, 05:05 PM
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#9 | |||
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Banned
Join Date: Jun 2007
Posts: 206
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Quote:
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07-08-2007, 05:31 PM
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#10 | ||
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Built Ford Tough
Join Date: Jan 2005
Location: State of Euphoria Mod: F-Series
Posts: 3,035
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4.11's plus manual shouldn't be too short. There are members of AFF with 6 speed manual BAII/BF that have an even shorter 1st gear and are running 4.11's.
__________________
Black on white '83 SWB F100 C6 auto 351C on gas and on the ground --> Project Thread '55 F100, just a roller at the moment, new project Silver MY12 Volkswagen Amarok |
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07-08-2007, 06:11 PM
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#11 | ||
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Its gone V
Join Date: Sep 2005
Posts: 359
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dont XR8's run taller 1,2,3 gears?
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07-08-2007, 06:24 PM
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#12 | ||
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Regular Member
Join Date: Apr 2006
Posts: 119
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just got 4.11's fitted today and are great sofar. imo 4.11's in a v8 would be even better
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07-08-2007, 06:48 PM
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#13 | ||
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Banned
Join Date: Jan 2005
Location: Qld Moderator
Posts: 3,731
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Looking for a set of 4.11's for mine too...
What did you pay for yours and how much to install etc? |
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07-08-2007, 07:40 PM
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#14 | ||
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Regular Member
Join Date: Apr 2006
Posts: 119
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mine were $900 fitted but thats live axle and an i6
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08-08-2007, 07:25 AM
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#15 | ||
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Banned
Join Date: Jan 2005
Location: Qld Moderator
Posts: 3,731
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thanks
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08-08-2007, 08:38 AM
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#16 | |||
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Built Ford Tough
Join Date: Jan 2005
Location: State of Euphoria Mod: F-Series
Posts: 3,035
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Quote:
__________________
Black on white '83 SWB F100 C6 auto 351C on gas and on the ground --> Project Thread '55 F100, just a roller at the moment, new project Silver MY12 Volkswagen Amarok |
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08-08-2007, 06:24 PM
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#17 | ||
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Regular Member
Join Date: Apr 2006
Posts: 119
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new gears as far as i know. had to brake there balls to get that price pay cash and the rest of it.
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08-08-2007, 07:53 PM
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#18 | ||
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Built Ford Tough
Join Date: Jan 2005
Location: State of Euphoria Mod: F-Series
Posts: 3,035
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Ahh, ok - I've been quoted $1100 odd with new gears, etc.
__________________
Black on white '83 SWB F100 C6 auto 351C on gas and on the ground --> Project Thread '55 F100, just a roller at the moment, new project Silver MY12 Volkswagen Amarok |
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08-08-2007, 08:03 PM
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#19 | ||
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Banned
Join Date: Dec 2004
Posts: 8,303
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4.11s are awesome for the street
 On the track, if you've got a stock-ish motor (my EB's power output is probably on-par with a stock AU XR8, it made 137rwkw on a 40*C day with a 3000rpm stally), you'll get the jump on XR6Ts to the halfway mark, then they'll walk all over you after that point to the finish line. The short gears do have a negative impact on performance at highway speeds, although it's not too great an impact. This is reflected in the car feeling like it's beginning to run out of puff down the 2nd half of the track instead of continuing to charge on. I got 14.78@91.48mph with a stally, 14.91@95.0mph without the stally (but much better on the street now). |
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4.11 Diff Gears
Linear Mode
