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diff ratios

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deegs88

Joined: Tue Jul 26, 2011 4:46 am
Posts: 59
Location: QLD

Posted: Wed Dec 07, 2011 3:58 am

does all standard sierras have the same diff ratios.

SierraDan

az supporter

Joined: Fri Feb 04, 2011 10:55 pm
Posts: 9347
Location: Newcastle
Vehicle: G13BB Jimny

Posted: Wed Dec 07, 2011 4:01 am

Nope. To my knowledge, 3.7, 3.9, 4.1 in all different types of sierra's/maruti.
5.12 from the front diff of auto? vitaras.

They're the ones im aware of.

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zukmeista

Joined: Sun Mar 22, 2009 10:30 pm
Posts: 1273
Location: Whangarei,N.Z.

Posted: Wed Dec 07, 2011 4:02 am

SJ40/1.0l sierra: 4.1:1
SJ50/1.3l NT sierra: 3.9:1
SJ70/1.3l WT sierra: 3.7:1
SJ80/1.3l coil sierra: 3.9:1

deegs88

Joined: Tue Jul 26, 2011 4:46 am
Posts: 59
Location: QLD

Posted: Wed Dec 07, 2011 4:04 am

whats the best ratios to get a bit more power

Gwagensteve

Joined: Thu Feb 26, 2009 10:30 pm
Posts: 12997
Location: Melbourne

Posted: Wed Dec 07, 2011 6:05 am

Changing your diff ratios does not give you more power.

Shorter ratios ( bigger number) spin the motor faster for the same road speed so the engine is developing more power at the same road speed as compared to standard gears, so it will hold speed for longer on hills.

The car will also accelerate faster. THe byproduct of this is that your lower gears are less useful on road, and fuel economy decreases due to the higher revs. In the case of a carby car, this change can be significant.

Changing diff ratios is best done to put revs back to standard once you have fitted bigger tyres.

More information about your setup will allow use to provide better advice.

Steve.

SierraDan

az supporter

Joined: Fri Feb 04, 2011 10:55 pm
Posts: 9347
Location: Newcastle
Vehicle: G13BB Jimny

Posted: Wed Dec 07, 2011 6:56 am

I have 31's, 4.16 transfer, 3.9's diffs with the 1.3 motor. Its almost perfect for cruising around town. Somewhere around 4000rpm @ 100.

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Rusho

Tubby Elfsdong

Joined: Sun Aug 02, 2009 11:30 pm
Posts: 6501
Location: Northside, Brisbane
Vehicle: Coily Sierra

Posted: Wed Dec 07, 2011 7:47 am

SierraDan wrote:

I have 31's, 4.16 transfer, 3.9's diffs with the 1.3 motor. Its almost perfect for cruising around town. Somewhere around 4000rpm @ 100.

I have the same but with 6.5's, same speed/revs also

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Shandy

Joined: Tue Apr 26, 2011 3:48 am
Posts: 45
Location: canberra

Posted: Wed Dec 07, 2011 8:28 am

is there any external marks to let me know the ratio? just chucked a 2nd hand diff in the back of mine and didnt count the teeth and i dont really wanna pull the bastard back out just to count em.

SierraDan

az supporter

Joined: Fri Feb 04, 2011 10:55 pm
Posts: 9347
Location: Newcastle
Vehicle: G13BB Jimny

Posted: Wed Dec 07, 2011 8:39 am

dont think so..

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Fatzook

az supporter

Joined: Sat Oct 27, 2007 11:30 pm
Posts: 14977
Location: The Hills
Vehicle: Vitara, NGV

Posted: Wed Dec 07, 2011 8:42 am

SierraDan wrote:

dont think so..

X2.

There is a way you can count the ratio by turning the pinion flange a certain number of times, but I can't remember the process. :roll:

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Shandy

Joined: Tue Apr 26, 2011 3:48 am
Posts: 45
Location: canberra

Posted: Wed Dec 07, 2011 10:12 am

i guess i can mark the pinion and wheels and count the number of times till the pinion and the wheels all line back up. the devide the number of pinion rev over wheels rev.
i have a horrible feeling that my rear diff is diferant to my front diff!
beats pullin both diffs out and counting em!

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