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Diff ratio 3.7:1 to 4.11:1 

 

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Posted: Thu Oct 06, 2005 7:59 pm 
Getting Side Ways
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i have manual and it revs at round 2150 and i am thinkin or goin to 3.27 for turbo setup cos first gear is way to short with 3.45 at the moment

my 2 cents lol :)

 

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Posted: Fri Oct 07, 2005 6:51 pm 
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what should i wxpect from a 3.9 and a 5 speed?i already have it all running but gl instrument cluster and un calibrated speedo...i got no idea

 

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Posted: Sat Oct 08, 2005 2:53 pm 
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madeaspack wrote:
what should i wxpect from a 3.9 and a 5 speed?i already have it all running but gl instrument cluster and un calibrated speedo...i got no idea
mine sits at 2450rpm @ 100kph (fully calibrated)

 

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Posted: Sat Oct 08, 2005 6:58 pm 
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ED I6 wrote:
madeaspack wrote:
what should i wxpect from a 3.9 and a 5 speed?i already have it all running but gl instrument cluster and un calibrated speedo...i got no idea
mine sits at 2450rpm @ 100kph (fully calibrated)

Now thats what I'm talking abot!
Thats more reasonable. So all I need now is a 3.7 ratio feedback.

 

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Posted: Sat Oct 08, 2005 7:51 pm 
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Where did you get your calibration done, how much?
i have an ef fairmont just got 3.9, rev at about 2350 on 100k's
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Posted: Sun Oct 09, 2005 12:11 pm 
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XITED6 wrote:
i have 3:45's. XR diff. so i really had no choice.Happy with them though. But if i was to choose id go 3:70's :) Contact Preston diif's & auto's. St georges rd preston. Have a chat to them.


only do this if you wanted to get shafted sideways

 

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Posted: Sun Oct 09, 2005 12:46 pm 
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XITED6 wrote:
i have 3:45's. XR diff. so i really had no choice.Happy with them though. But if i was to choose id go 3:70's Contact Preston diif's & auto's. St georges rd preston. Have a chat to them.

nannas_ed wrote:
only do this if you wanted to get shafted sideways


why whats wrong with them they did my shift kit and hi stall on my old futura and i can highly recommend their work

 

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Posted: Sun Oct 09, 2005 10:15 pm 
Oompa Loompa
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nglig wrote:
Where did you get your calibration done, how much?
i have an ef fairmont just got 3.9, rev at about 2350 on 100k's

There is no speedo gear for 3.9 gears so a transducer has to be added and calibrated on a dyno (was included in the conversion for me, i think the transducer was around $80).

 

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Posted: Mon Oct 10, 2005 12:13 am 
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EFFalcon wrote:
my car does 2050rpm @ 100 in 4th gear on the auto with a 3.45 diff.

3.7 would have it at 2200rpm @ 100
3.9 would have it at 2325rpm @ 100
4.1 would have it at 2450rpm @ 100

really not THAT bad... but then keep in mind you'll often do 110/120


i have 4.1 in my 5L Auto and i do about 2500rpm @ 100kms......wouldnt the I6 have to rev more to get the same speed as a v8
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Posted: Mon Oct 10, 2005 1:25 pm 
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no because the gearing is pretty similar in both. also the power and torque are very similar also. ef is only 8kw and about 15-20nM less than the v8.

 

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Posted: Mon Oct 10, 2005 1:36 pm 
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wat are fuel consuption like compared to stock
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Posted: Tue Oct 11, 2005 8:37 am 
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wild6 wrote:
XITED6 wrote:
i have 3:45's. XR diff. so i really had no choice.Happy with them though. But if i was to choose id go 3:70's Contact Preston diif's & auto's. St georges rd preston. Have a chat to them.

nannas_ed wrote:
only do this if you wanted to get shafted sideways


why whats wrong with them they did my shift kit and hi stall on my old futura and i can highly recommend their work



They also changed my 9" to LSD and changed the ratio to 4.11, they were awsome, I give my car HEAPS and theres been no dramas! Great service, even better back up service. Ive been back with a conscern before and Alex was more than happy to come for a drive with me and listen for problems, 6 months AFTER I got the work done!, turns out the problem was unrelated but still they helped me find it and put me onto someone that could help fix it. So dont just paysome one out, document your problem so others can avoid it or shut the hell up nannas_ed.

 

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