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Old 05-08-2001, 06:08 AM   #1
Patrick Olsen
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Question 5MT different for original Outback? (Shorter 5th gear?)

There's a discussion in the Legacy Forum about gear ratios in the Legacy GTs and GT Limiteds http://www.i-club.com/ubb-files/Forum6/HTML/001217.html . "rrubel" posted the following:

Quote:
These are the gearings for 97; they should be identical to a 99.
5-speed manual:.....4-speed auto:
1....3.545...............3.027
2....2.111...............1.619
3....1.448...............1.000
4....1.088...............0.694
5..0.871(OB)/.780 rest.....N/A
FD...4.11.................4.44

So there is some difference between the Outback and all the other models, but that's it.
The different 5th gear thing is something I had never heard of before. Does anyone know anything about this? Is it just the early Outbacks that have a different 5th gear, or do all the model years have the same transmission? Can anyone tell me why Subaru would but a significantly shorter 5th gear in the Outback?

Would that shorter 5th gear be a good or a bad thing (or not a thing at all) during open track events? I know at VIR I was easily getting into 5th gear on both the front and back straights, but once I was there my acceleration was almost non-existent. Would the shorter 5th gear help? Based on shifting out of 4th at 6250rpm, with the 2.5GT transmission I'm at about 4500rpm in 5th, with the OB tranny I would be at around 5000rpm - a pretty big difference. That would put me farther away from peak torque, but closer to peak power, which is where I want to be, right?

Comments?

Pat Olsen
'97 Legacy 2.5GT sedan
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Old 05-08-2001, 07:44 AM   #2
skidplatez
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Outbacks have taller tires.
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Old 05-08-2001, 08:51 AM   #3
ColinL
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I agree, this is because of the 225/60-16 that the Outbacks wore.

Pat, the closer gearing will help you but you might discover that the optimum shift point for 4>5 isn't 6250 any more.

Whether this gamble is worth it depends entirely on how much you can get an OB tranny for IMO... 5 speeds aren't that common in the Outback line from what I've seen.

If you have plans to upgrade the power in your GT significantly, then don't do this. 5th gear is still a long jump, but with the low rev limit and high axle ratio it's needed to keep a top speed over 120 and reasonable cruising RPM. More powerful cars have no problems pulling 5th.
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Old 05-08-2001, 11:35 AM   #4
Kikin
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Hello! I thought nobody was going to find this out. I have a MY99 RS and I changed my 5th gear with the one from the Outback. You don't need a tranny just order the 5th gear as it is available trough any Subaru parts dealer.
The difference? Night and Day.
Before the change the car pull hard trough every gear until I hit 5th. It takes a few seconds until the car start pulling again. Remember that the 5th gear is an overdrive. After the change, the cars keeps pulling all the way to redline, or about 128mph, when the relay cuts off. I have 45 profile tires so If you have a taller tire your top speed would be a little bit more.
Every day driving is a blast, I don't have to downshift to 4gear so often now. Crusing speed and RPMs, at 60mph / 3,000 rpms, 80mph / 4,000 rpms.
Price was about $120 for the 5th gear and installation was like $150-$200 (I know the mechanic) so probably the price for installation would vary from place to place.
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Old 05-08-2001, 08:55 PM   #5
Patrick Olsen
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Yeah, the tire size is an obvious answer as soon as someone mentions it. Duh!

It's an intriguing idea, and one I'll have to think about some more. I would like to have significantly more power in the car someday, but I'm not sure it will ever happen. I would guess the wildest I'll get would be the MRT exhaust (which will supposedly be here this century) and perhaps the Cobb DOHC set.

I really don't need the ability to get over 120mph. Besides, by my calculation the top speed at redline would be about 131mph, which is about as high as I've been able to get the car thus far with the stock 5th gear.

Kikin - Any data on gas mileage effect of the higher cruising RPMs?

Pat Olsen
'97 Legacy 2.5GT sedan
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Old 05-08-2001, 09:11 PM   #6
motorob
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Uhhhh, Outback tire size is 205/70-15... not 225/60-16, although that would be impressive.
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Old 05-09-2001, 06:29 AM   #7
ColinL
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The OB Limited does wear 225/60-16.
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Old 05-09-2001, 06:44 AM   #8
Kikin
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Gas millage has been affected alittle bit but not tha much. It wil be like $2-$5 of gas more a week. Don't know how many miles less in a tank full, I don't keep track of that.
I think I have the part number for the 5th gear somewere in my house. As soon as I find it I'll post it here.
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Old 05-09-2001, 07:20 AM   #9
yebokmj
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No outbacks including the outback limited used a 16inch rim untill the redesign in MY00. All Outbacks previous used a 15 inch rim. I can confirm this from what I have seen at the dealership since I have worked here and because we have three used outback limiteds on the lot MY97-99. In the first year of the outback MY95 pretty much an L with a paint job also had 15inch wheels but with smaller tires then the next few years because it didn't have the raised suspension till MY96. An as to availablity of 5spd outbacks I see them come through here all the time so you might be able to pick the parts up used easily.
Joshua
Subaru Salesman
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