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OzECruisers General Discussions E/N/D vehicles General Discussion ONLY. NO TECH THREADS |
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#1 | ||
FF.Com.Au Hardcore
Join Date: Mar 2007
Posts: 2,699
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I hear a lot of people talking about diffs.
What exactly are they? Is it another name for the axle or the part in the center that the tailshaft connects to? I was told 4.11 diff gears were the best value for money mod. Are there any disadvantages such as transmission strain, worse economy etc?
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EB II 1992 Fairmont - koni reds, wade 977b, 2.5inch/4480's and much more to come! |
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#2 | ||
el wagon
Join Date: Dec 2006
Location: melb
Posts: 446
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it is the ratio of the crown and pinion,(geared wheels inside the diff housing centre).it is a lower gear ratio than most std cars.... it is a similar effect to using a big gear wheel on the back of a pushbike compared to a smaller gear wheel. ( hope that kinda explains it.
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#3 | ||||||
Regular Member
Join Date: Aug 2006
Location: Perth, WA.
Posts: 109
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If you want acceleration, it's a good mod to do as it gives better takeoff, but the car will rev higher also, particularly noticeable when cruising at highway speeds. It's also worthy to note that if you change your diff gears, you should make sure to get LSD, as 4.11 gears with LSD aren't so great. Quote:
Generally, economy will suffer due to higher revving. If you want to get better takeoff but maintain some cruisability go for something like 3.5-3.9, can't really say without knowing what you have already. |
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#4 | ||
www.TUFFCARPARTS.com
Join Date: Feb 2006
Posts: 5,221
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Given that practically every thread you start mentions a concern with fuel economy, I really don't think 4.11's would be the best mod for you.
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#5 | |||
FF.Com.Au Hardcore
Join Date: Mar 2007
Posts: 2,699
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Quote:
I'm guessing though 4.11's won't be as good for towing?
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EB II 1992 Fairmont - koni reds, wade 977b, 2.5inch/4480's and much more to come! |
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#6 | ||
low wagooon
Join Date: Jan 2007
Location: Swan Hill
Posts: 1,579
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It wont be good on economy due to revving higher in the gears because its a higher ratio. Standard will be 3.27 or something like that. If you wanted better economy you would get 2.77 gears. But you loose takeoff power with a ratio like that
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Webby
S2 AU XR6 UTE |
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#7 | ||
OzEcruisers PRESIDENT
![]() Join Date: Mar 2005
Location: Melbz
Posts: 15,761
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4.11's are gears for a car that you want to Drag Race
If your car is not a daily and you drive it only on weekends then go for it If your car is a daily then your going to increase the wear and tear on your car due to it having to rev higher.......... And yes its good for take off but rubbsih for fuel economy
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1994 Ford Fairmont EF NA 6cyl Man 3.9 diff Sedan PROEF 13.46 @ 105.78mph Tuned by DYNOMOTIVE 200BUX - AFF Drag Nats 2019 EF Wagon
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#8 | |||
EBII XR6
Join Date: Jul 2006
Location: Bendigo. Victoria
Posts: 5,278
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DEVLXR
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#9 | |||
el wagon
Join Date: Dec 2006
Location: melb
Posts: 446
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Quote:
HIGHER ratio = highway gearing ( slower revving). |
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#10 | ||
BrwnBstd
Join Date: May 2006
Posts: 746
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Probably better off calling it tall and short, not high and low.
Forget about fuel usage, only 35 kms per tank difference for me going from 3.23 to 3.9, and thats at 52km/h average so I do have some high speed driving involved. If you ONLY do highway driving then you will lose 15% in distance per tank though. If you also fit a modifed torque converter then you will use more fuel. Is it the best value mod per dollar?.. at 1200 bucks and 0.5 seconds difference from 0-100.. maybe.. full exhaust is proably still better per dollar, but not as much fun. |
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#11 | |||
low wagooon
Join Date: Jan 2007
Location: Swan Hill
Posts: 1,579
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Webby
S2 AU XR6 UTE |
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