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Diff Ratio's and what springs? 

 

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 Post subject: Diff Ratio's and what springs?
Posted: Tue Feb 13, 2007 6:19 pm 
Parts Gopher
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hey i find the whole ratio thing with diffs really really confusing.. how does messing with this increase performance? and what is good for an AU III?

also... i want to lower my auIII what are the best springs to get i hear superlows and ultralows are okay?
also what prices am i looking at for changing diff ratio + lowering?

Michael
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Posted: Tue Feb 13, 2007 6:36 pm 
Getting Side Ways
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The higher the ratio, i.e. larger numbers the quicker your car will accelerate, but there is a downside of lower top speed, and higher revs at speeds, so this can lead to more fuel consumption. This is because the engine is turning more times for less turns of the wheel.
Alternatively, you can lower the ratio, less acceleration, high top speed, better fuel economy crusing on highways, etc.
You really need to find a balance that suits your car, and application.

 

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Posted: Tue Feb 13, 2007 6:46 pm 
Parts Gopher
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thanks.. what is wrong with the standard then wouldnt that be the best mid ratio ? for fuel consumption,acceleration,top speed?
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Posted: Tue Feb 13, 2007 7:41 pm 
Getting Side Ways
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Heres a formula to work out speed v diff ratios.

 

 

Attachments:
Speed calculator with example.jpg
Speed calculator with example.jpg [ 353.25 KiB | Viewed 44 times ]

 

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Posted: Tue Feb 13, 2007 10:38 pm 
Oompa Loompa
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isn't a lower ratio 3.9:1 and a higher ratio 3.08:1.
higher means longer legs and lower means quick acceleration.

JIM
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Posted: Fri Mar 02, 2007 7:45 pm 
Fordmods Newbie
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Ride: '96 EF

Location: Mandurah
WA, Australia

Can anyone tell me what the standard factory diff ratio is for an EF?

Also, how much extra acceleration do you get out of upping the diff, say, 0.3?

 

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Posted: Fri Mar 02, 2007 7:48 pm 
Getting Side Ways
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standard is 3.08 for a EF.

 

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