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Diff Ratio 

 

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 Post subject: Diff Ratio
Posted: Sun May 07, 2006 6:52 pm 
Oompa Loompa
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Age: 33

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Ride: VX SS II M6

Location: Brisbane
QLD, Australia

Hey does anyone know what revs at 100km I would be doing If i change my diff gears to 3.7:1 in EF fairmont Auto?

How much more fuel would be used under normal driving?

 

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Posted: Sun May 07, 2006 6:55 pm 
Getting Side Ways
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Ride: BA MKII XR8

Location: Caroline Springs
VIC, Australia

I think MRNASTY has 3.7 diff gears??? PM him.

Mine has a 3.45 LSD and does around 2100 rpm at 100 kays, which (for me) is high enough.
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Posted: Sun May 07, 2006 7:10 pm 
Fordmods Junkie
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Location: Perth
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be close to 2500/2700rpm

u can work it out u know... :)

 

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Posted: Sun May 07, 2006 7:10 pm 
Getting Side Ways
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Ride: EF Falcon 95

Location: Rosebud
VIC, Australia

yes i have 3.73:1 gears. sits on 2300rpm at 100km/h and i really didnt notice much of a change in fuel economy. There would have been, but i didnt notice heaps of difference from 3.08:1 in regards to fuel cosumption. definatly better acceleration.

 

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Posted: Mon May 08, 2006 12:31 am 
Oompa Loompa
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Location: adelaide
SA, Australia

i have 3.91, and i'm doing about 2250 rpm at 100..

MR Nasty, is urs manuel or auto.??

JIM
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Posted: Mon May 08, 2006 12:33 am 
Stock as a Rock
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Location: melbourne west
VIC, Australia

ive got 3.9's in my xr8 manual and it sits at about 2400 at 100kmh (120kmh on the speedo)
id guess 3.9's would be between 2200rpm and 2300 rpm

 

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Posted: Mon May 08, 2006 12:56 am 
Getting Side Ways
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Disco Frank wrote:
u can work it out u know... :)


Yep, find what rpm your car does at a speed , then divide by your gear ratio and multiply by the ratio you want.

so if I have a 3.23 diff and do 2100rpm at 100kph and am thinking about changing to 3.9's

2100rpm / 3.23 * 3.9 = 2535rpm

 

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Posted: Mon May 08, 2006 7:29 pm 
Getting Side Ways
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mine is an auto falconkid

 

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