SG9 final drive ratio 5MT DR

stilson

stilson

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Ive seen charts that say its 4.11 but people have told me its 3.9, they cant both be wrong.

Anyone know for sure?
 
For an SG Forester it's 3.90. My SF has 4.11. I do 3200rpm at 110km/hr in 5th.
I think it's just under 3k for the SG which would be the difference between 3.90 and 4.11.
I have seen both gen 3 Outbacks in manual with 4.11 and 3.90 diff ratios. The 4.11 behind the 2.5l engine seems to be much nicer for general drive ability.
Barry's OB has 3.90 as well, same as a 2nd generation Forester.

EDIT: If you put your car's in low range (1.198.1) and drive around you will notice the pulling power to be much greater. This would similar gearing to running 4.44 diff ratios.
 
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G'day Taza

taza said:
Call the dealer and ask... Give them your vin no and they will be able to confirm. I'm not 100% sure but pretty bloody close.
Click to expand...

Two sources:

1) https://www.eurodb.com.au/used-car-Specification/SUBARU/FORESTER/X/2006/FY606H/

2) www.carbuddy.com.au (no longer available from here, but I printed it when it was ... )

both state the Oz model 2006 Fox manual as having a FD ratio of 4.111:1

However, the gearbox ratios are pretty different from my Impreza, with 3/4 being the same, 1 = higher, 2 = lower and 5th is much higher, at 0.780:1 as against the Impreza's 0.825:1. The Impreza had a FD ratio of 3.900:1.

Of course, one needs to chuck in the fact that the Fox has a dual range box, and bigger wheels with around 7.8% bigger rolling circumference.

That gives the 2006 Fox around 38 kph/1000 revs as against 33.5 kph/1000 for the Impreza, which is the same as the SF Forester, IIRC.
 
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I'm with Ratbag on this one, I think the EJ25 Foz NA 5MT are fitted with 4.111

The NA 4EAT is 4.444

and it's all reversed on the Turbos: 5MT is 4.444 and 4EAT 4.111

All this according to my spec sheet for the MY07, but I'm pretty sure it applies for the SG9 family...
 
Gidday pezimm

pezimm said:
I'm with Ratbag on this one, I think the EJ25 Foz NA 5MT are fitted with 4.111

The NA 4EAT is 4.444

and it's all reversed on the Turbos: 5MT is 4.444 and 4EAT 4.111

All this according to my spec sheet for the MY07, but I'm pretty sure it applies for the SG9 family...
Click to expand...

Are you allowed to upload a scan of this?

Subaru only started making vehicles this year, judging by the total lack of historical information on their web sites ...

I have the original brochures with this info for a number of Subies, collected since I first got Roo1 all those years ago. Most of these are in A3 format, but one of my clients has an A3 to PDF scanner if this is allowed :).
 
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Are you allowed to upload a scan of this?
Click to expand...

Well, I suppose if Subaru was happy to give it away back then, it should be ok to post it online! :lildevil:

Scan%2520121510000.jpg


Pedro.
 
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MY07 Forester Specs from Subaru sale brochure

Thanks Pedro :)

Much appreciated.
I have printed it for my file.

br, J.
 
taza said:
For an SG Forester it's 3.90. My SF has 4.11. I do 3200rpm at 110km/hr in 5th.
I think it's just under 3k for the SG which would be the difference between 3.90 and 4.11.
I have seen both gen 3 Outbacks in manual with 4.11 and 3.90 diff ratios. The 4.11 behind the 2.5l engine seems to be much nicer for general drive ability.
Barry's OB has 3.90 as well, same as a 2nd generation Forester.

EDIT: If you put your car's in low range (1.198.1) and drive around you will notice the pulling power to be much greater. This would similar gearing to running 4.44 diff ratios.
Click to expand...

So Gen 4 manual Outbacks all have 3.90 diffs?

At 3000rpm in 5th gear the speedo shows 110kph - actually 105 according to my GPS.
 
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Subaru brochures

Gidday All

Have just 'found' a whole lot of Subaru brochures for the Brumby, Leone, Sportswagon series.

Also for Liberty, Outback; and Foresters SF and SG.

These date from the late 1980s up to 2003, covering 1.8L, 2.0L, 2.2L and 2.5L engined cars.

It is interesting to note how the gear sets get changed, and also how Subaru play mix-n-match a lot as they have striven to sort out the gearing for the various engines/models.

It will be a few weeks before I can scan these.
 
Forester Final Drive ratios

Gidday Folks

Just to clarify - ALL N/A SF and SG Foresters 5MT DR have had 4.111:1 FD ratios. The differences in gearing between SF and SG are mostly in 1st/2nd and 5th, and from the difference in the rolling circumference of the rims/tyres.

The LR ratio was 1.447:1 in the SF, and 1.196:1 in the SG.

The c.2000 Outbacks (2.5L, N/A, DR) had the same gear ratios as the SF Forester, except for 5th which was 0.825:1 vs 0.871 in the SF. Both the OB and Foz of that period had the same rims/tyres. The OB had the same LR ratio as the SG Fox, at 1.196:1.
[EDIT] The OB also had 4.111:1 FD ratios [end edit]

The SF weighed 1320 kgs and the 2003 SG XS weighed 1362 kgs, both unladen. The MY06 & MY07 SG were a little heavier than this at about 1405 kgs for the XS models. The SG models had around 35% more KWs and about 26% more torque than the SFs, albeit with a very much flatter torque curve.
The OB weighed 1420 kgs

All of the above figures are from the official Subaru brochures for the models mentioned.
 
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Thanks RB,

what are the differences between SF and SG in regards to 1st and 2nd gear ratios?

Thanks,

Seanan.
 
Gidday ST

stilson said:
Thanks RB,

what are the differences between SF and SG in regards to 1st and 2nd gear ratios?

Thanks,

Seanan.
Click to expand...

SF:

1st = 3.545
2nd = 2.111
3rd = 1.448
4th = 1.088
5th = 0.871

FD = 4.111:1

SG:

1st = 3.454
2nd = 2.062
3rd = 1.448
4th = 1.088
5th = 0.780

FD = 4.111:1

Basically makes it less of a close ratio box.
Also more than compensated for by the much higher torque figures of the 2.5L donk, and far flatter torque curve.

Personally, I would have liked to have a bit higher 4th gear - e.g. something like the 1.000 from the AT box. Around town, mine is a bit high revving in 4th, and a bit too low in 5th. There is also a noticeable gap on the open road, but not so much of a bother there.
 
Thanks again RB,

I'd like a 1:1 fourth gear also as im never satisfied with my gear selection between 60 and 70 kph.

Someday when I have the funds and/or the time ill build a box like this:

1st = 3.545
2nd = 2.111
3rd = 1.448
4th = 1.000
5th = 0.780

DR = 1.59:1

FD = 4.444:1

and try to convince the authorities to allow me to run oversized tyres.
 
No worries ST. You're welcome.

stilson said:
Thanks again RB,

I'd like a 1:1 fourth gear also as im never satisfied with my gear selection between 60 and 70 kph.

Someday when I have the funds and/or the time ill build a box like this:

1st = 3.545
2nd = 2.111
3rd = 1.448
4th = 1.000
5th = 0.780

DR = 1.59:1

FD = 4.444:1

and try to convince the authorities to allow me to run oversized tyres.
Click to expand...

I would prefer to use a 1.447:1 LR and the 3.900 diff ratios F&R.
Otherwise, I would leave all gearbox ratios alone (except perhaps 4th).

In fact, changing to 3.900:1 DRs would mean that 4th HR would be much more serviceable anyway.

The far greater torque at low revs and flatter torque curve of the 2.5L N/A donk would give better results with just these changes IMHO.

Always remember the lesson of the Austin Healey 3000 Six. It would strip first gear at the drop of a hat, let alone the clutch ... Too much torque through too high a gear set (the gearbox was basically out of a 100/4). The OEM recommended not to use first unless absolutely necessary ... :iconwink: :raz:
 
My first gear in Low Range does feel abit trippy really and you can never really take off smoothly in it.

Personally I would choose an SF box and gearset, with SG 5th gear, 1.61.1 low range, 4.44 diffs, vortex centre diff lock with AWD and front geared LSD. Rear manual or electronic engaging locker. Strengthened gears would be nice too :P
 
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