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Old 03-14-2003, 01:23 AM   #1
Jude DeMeis
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Default USA STi gets taller 5th and 6th gear

Anyone else notice that the USA STi is getting taller, wider ratio 5th and 6th gears than Japan? Probably a move to trade acceleration for highway MPG. 1st-4th are identical.

5th JDM = 1.062 USA = .971
6th JDM = .842 USA = .756

to save you the math, that's a 9.3% difference in 5th and a 11.3% difference in 6th
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Last edited by Jude DeMeis; 03-14-2003 at 01:29 AM.
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Old 03-14-2003, 03:19 AM   #2
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We get the same as Europe, UK, etc.

Only JDM gets the short 5th and 6th.
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Old 03-14-2003, 08:06 AM   #3
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I say push 6th gear until the car gets 30mpg at 80 mph.
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Old 03-14-2003, 09:27 AM   #4
Jude DeMeis
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Quote:
Originally posted by Glenn Wallace
Only JDM gets the short 5th and 6th.
No, Australia get's the quicker 5th and 6th as well.
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Old 03-14-2003, 10:37 AM   #5
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Ah you're right, I thought there was something the same between US and AUS and it was the final drive ratio.
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Old 03-14-2003, 10:39 AM   #6
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I have no problem with 6th gear being a cruising gear. Gotta figure, unless you are on a rather large track with long straights, 1-4 are going to be your main gears. It'll have enough power to pull through the 5th gear too I'm guessing.

MaxGrip
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Old 03-14-2003, 11:54 AM   #7
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Based on a speed/RPM graph, it looks like 5th is set up well -- shifting from 4th to 5th is close enough to 3rd to 4th. But 5th to 6th is too close -- shifting at 6500 rpm gets you down to a bit above 5000 rpm. Not enough of a difference. I'd like to see a 0.720 ratio perhaps, which would be much more like the other gears. It would let you run 90mph at 3500rpm. Arguably it could be even lower for highway use, but on tracks that might be bad since 5th tops out at about 135mph so the long straights need 6th.

I'm driving a 5 speed Miata now, and 90mph is about 4500rpm which is noisy and grating on the highway. On the other hand, I'm not a track racer nor an expert, so for the moment I'll trust the Subaru engineers.

Oh, the calculator I used is here: http://www.car-videos.com/tools/spee...B1=Recalculate
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Old 03-14-2003, 02:44 PM   #8
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Yes, I was glad to see we got the taller 5/6th gears. Otherwise driving on a freeway would have been a pain. Even with the taller 6th, it is shorter than the WRX, so I agree with WRX_mundi that a slightly taller 6th would have been nice for cruising to keep the revs down. Not that I'm complaining! The Evo has almost the same overall gearing in 5th as the JDM STi does in 6th, so it'll be reving high during a highway cruise.

For comparison:

Note: The second table only shows the final drive to the wheels, it doesn't include the ratio for the wheels.


Gear STi WRX Evo8 SRT-4
1 3.636 3.454 2.928 3.647
2 2.375 1.947 1.950 2.045
3 1.761 1.366 1.407 1.367
4 1.346 0.972 1.031 0.947
5 0.971 0.738 0.720 0.756
6 0.756 - - -
R 3.545 3.333 3.416 3.470
F 3.9 3.9 4.529 3.526
Tires225/45 205/55 235/45 205/50
17 16 17 17

Overall
in Gear
1 14.18 13.47 13.22 12.86
2 9.263 7.593 8.832 7.21
3 6.86 5.327 6.37 4.82
4 5.25 3.79 4.67 3.34
5 3.78 2.87 3.26 2.67
6 2.94 - - -


JDM STi - Overall
5 1.062 4.14
6 0.842 3.28



TRS

Last edited by ToddStratton; 03-14-2003 at 02:57 PM.
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Old 03-14-2003, 07:02 PM   #9
spburns74
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Jude,

Are you getting an STi?

MaxGrip
(previously owned white RS, remember the one that drove like it had casters for back wheels around Devens).
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Old 03-14-2003, 08:03 PM   #10
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Quote:
Originally posted by spburns74
Jude,

Are you getting an STi?

MaxGrip
(previously owned white RS, remember the one that drove like it had casters for back wheels around Devens).
You mean is he getting a USDM STi?
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Old 03-14-2003, 09:32 PM   #11
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I think with the torquey 2.5l engine, those gear ratios will work very well on the highway.
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Old 03-15-2003, 02:13 AM   #12
quynce
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Quote:
Originally posted by ToddStratton
Yes, I was glad to see we got the taller 5/6th gears. Otherwise driving on a freeway would have been a pain. Even with the taller 6th, it is shorter than the WRX
[/font]

TRS
Pardon my ignorance, but does this mean that 80 mph in 5th in a wrx will be at lower rpm than 80 mph in 6th in an STi? Thanks.

josh
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Old 03-15-2003, 09:10 AM   #13
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Yep

I'm happy to see Subaru didn't make the last two ratios unnecessarily tall. In fact, I'd even like the shorter 5th and 6th, as I rarely hit the highway in my WRX now. However I do realize at some point they have to be realistic and take MPG into account...
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Old 03-15-2003, 09:19 AM   #14
Electronsmurf
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Default wow!

Did you uys notice how tall 4th gear is on a srt-4???
it's considerably taller than the wrx's, which is already too tall!!?? holy moly...i wonder if that car is out of full boost when they upshift to fourth, since full boost on those cars doesn't hit till 4000+ rpms??


-Joe
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Old 03-15-2003, 11:26 AM   #15
Jude DeMeis
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Quote:
Originally posted by spburns74
Are you getting an STi?
Hey Steve, no, I have a complete JDM S202 315hp/6-spd parts car that I am presently transplanting into a USA body to run as a race car. A new STi doesn't make any economic sense for me because I know how to build the same thing for half price from used parts I buy from Japan.
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Old 03-15-2003, 03:12 PM   #16
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Quote:
Originally posted by quynce


Pardon my ignorance, but does this mean that 80 mph in 5th in a wrx will be at lower rpm than 80 mph in 6th in an STi? Thanks.

josh
Yes.

TRS
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Old 03-16-2003, 11:54 AM   #17
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Default Re: wow!

Quote:
Originally posted by Electronsmurf
Did you uys notice how tall 4th gear is on a srt-4???
it's considerably taller than the wrx's, which is already too tall!!?? holy moly...i wonder if that car is out of full boost when they upshift to fourth, since full boost on those cars doesn't hit till 4000+ rpms??


-Joe
No WRX and/or STi thread is complete without at least one SRT-4 reference!
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Old 03-16-2003, 04:24 PM   #18
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What the heck is an SRT-4?
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Old 03-16-2003, 05:42 PM   #19
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Really? Maybe I'll skip the STi and get one?
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