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Author Topic: diff ratio's  (Read 2240 times)

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bob.dent

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diff ratio's
« on: 22 September 2011, 13:13:28 »
I know this has probably been asked before but will a diff from a 2.6 auto estate be compatible with a 3.2 auto estate? Not sure if the ratio's are the same. :-/
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cem_devecioglu

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Re: diff ratio's
« Reply #1 on: 22 September 2011, 13:20:13 »
« Last Edit: 22 September 2011, 13:22:08 by cem_devecioglu »
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cem_devecioglu

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Re: diff ratio's
« Reply #2 on: 22 September 2011, 13:24:04 »
4.22 instead of 3.90 your car will be faster but will consume slightly more
« Last Edit: 22 September 2011, 13:24:36 by cem_devecioglu »
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Osprey

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Re: diff ratio's
« Reply #3 on: 22 September 2011, 13:28:42 »
... and run higher revs at cruising speed. 
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bob.dent

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Re: diff ratio's
« Reply #4 on: 22 September 2011, 14:28:06 »
Thanks guys, so not the way to go for better fuel economy! ::)
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tigers_gonads

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Re: diff ratio's
« Reply #5 on: 22 September 2011, 15:10:10 »
Mines a 2.5 manual gearbox / dif on a pre facelift with a 3 ltr engine

Anybody know which gear ratio's / diff I have ?
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cem_devecioglu

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Re: diff ratio's
« Reply #6 on: 22 September 2011, 15:12:40 »
Quote
Mines a 2.5 manual gearbox / dif on a pre facelift with a 3 ltr engine

Anybody know which gear ratio's / diff I have ?

depending on the model year you can check from my second link :y
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tigers_gonads

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Re: diff ratio's
« Reply #7 on: 22 September 2011, 15:14:02 »
Quote
Quote
Mines a 2.5 manual gearbox / dif on a pre facelift with a 3 ltr engine

Anybody know which gear ratio's / diff I have ?

depending on the model year you can check from my second link :y


97 (pre facelift)

facelift engines only on that chart  ;)
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cem_devecioglu

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Re: diff ratio's
« Reply #8 on: 22 September 2011, 15:15:04 »
Quote
Quote
Quote
Mines a 2.5 manual gearbox / dif on a pre facelift with a 3 ltr engine

Anybody know which gear ratio's / diff I have ?

depending on the model year you can check from my second link :y


97 (pre facelift)

facelift engines only on that chart  ;)

97 original manuals 2.5 have 3.70 as far as I know :y

not sure for 3.0 :-/
« Last Edit: 22 September 2011, 15:15:53 by cem_devecioglu »
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cem_devecioglu

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Re: diff ratio's
« Reply #9 on: 22 September 2011, 15:18:10 »
Quote
Thanks guys, so not the way to go for better fuel economy! ::)

if you quickly shift up, fuel consumption wont change much imo..
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Jimbob

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Re: diff ratio's
« Reply #10 on: 22 September 2011, 15:56:52 »
if you send me reg's ill happily check what they left the factory with.
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feeutfo

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Re: diff ratio's
« Reply #11 on: 22 September 2011, 15:58:52 »
Got 4.2 in mine. Slightly quicker, but some of that is negated by the slightly over size tyre/wheel combo. And the weight of the lpg tank etc. It's a couple of hundred rpm higher at, say, 80.
Not massive.

May as well get the right one Bob, if your not after any performance increases. There must be plenty about if not plod or LSD spec.
« Last Edit: 22 September 2011, 16:05:06 by chrisgixer »
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Jimbob

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Re: diff ratio's
« Reply #12 on: 22 September 2011, 16:03:48 »
Bob, yours is 3.90:1 ratio  :y
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tigers_gonads

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Re: diff ratio's
« Reply #13 on: 22 September 2011, 16:57:04 »
3.7 Diff in mine ( cheers jimbob )

Always thought my car should be a little quicker of the line  :-/

Do all the diffs have the same torque rateing ?
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Kevin Wood

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Re: diff ratio's
« Reply #14 on: 22 September 2011, 17:19:19 »
3.90 in an auto and 3.70 in a manual is the usual spec.

The difference in diff ratio between auto and manual is due tot he automatic gearbox having a taller ratio in top gear so I think the two come out pretty much even when it comes down to it.

In fact, 2woody did some nice plots to show exactly that:

http://www.omegaowners.com/forum/YaBB.pl?num=1312469626

 :y
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