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Old 10-18-2017, 09:55 AM
  #31  
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Here's how the transmission effective gear ratio heat map changes assuming the 2007 STI has a 3.54 final drive:
Attached Thumbnails Yep it's Wednesday-tranny-heatmap-2007-354.jpg  
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Old 10-18-2017, 09:57 AM
  #32  
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Originally Posted by Chris GTO TT
Throw in some spec.B 6spd gear sets into your calculations
The (probably wrong) source that I used for all of my other numbers shows that the USDM Legacy Spec B trans has the same gearing at the JDM Forester STI (which I show in my spreadsheet).
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Old 10-18-2017, 09:57 AM
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Originally Posted by Rev. Rob Large
Was it on or off when you nearly hit that tr.. nevermind.

But yes, 2006 STi had 3.54 R180 rear diffs.

See link below. Again.
It was off.

Tell Vlad it's 3.54. He said it was 3.9.
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Old 10-18-2017, 10:01 AM
  #34  
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Originally Posted by IS2Scooby
The (probably wrong) source that I used for all of my other numbers shows that the USDM Legacy Spec B trans has the same gearing at the JDM Forester STI (which I show in my spreadsheet).
Yeah that's not remotely correct lol. The spec.B 6spd has 07 sti 1-4 with a longer 5th and 6th.
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Old 10-18-2017, 10:07 AM
  #35  
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If you want some gear graph ****...

https://forums.nasioc.com/forums/sho....php?t=2466977


Even mentions that typical cost on used R180 is $400-500. That's the **** I'm having a hard time finding.
Last edited by JourdanWithaU; 10-18-2017 at 10:12 AM.
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Old 10-18-2017, 10:07 AM
  #36  
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BTW, just because I'm old and probably blind... Where are you guys seeing the Rallipec doc pointing to a 3.54 FD ratio vs. 3.90?

I see a 3.54 reverse transmission gear ratio shown, but not as a final drive.
Attached Thumbnails Yep it's Wednesday-390-fd.jpg  
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Old 10-18-2017, 10:13 AM
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I never looked at that very closely... It seems that 3.54 FD isn't on the list at all.
Last edited by JourdanWithaU; 10-18-2017 at 10:15 AM.
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Old 10-18-2017, 10:15 AM
  #38  
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Subaru started using a 1.1:1 output on the 6spds so in order for the actual final drive ratio to match the front final drive and the rear final drive are different. Cars with a 3.90 front final drive and the 1.1:1 reduction got a 3.54 rear differential.
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Old 10-18-2017, 10:15 AM
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Originally Posted by Chris GTO TT
Yeah that's not remotely correct lol. The spec.B 6spd has 07 sti 1-4 with a longer 5th and 6th.
Here's what the Rallispec doc says re: FSTI and Spec B Ratios:
Attached Thumbnails Yep it's Wednesday-fsti-vs-spec-b.jpg  
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Old 10-18-2017, 10:16 AM
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Originally Posted by Chris GTO TT
Subaru started using a 1.1:1 output on the 6spds so in order for the actual final drive ratio to match the front final drive and the rear final drive are different. Cars with a 3.90 front final drive and the 1.1:1 reduction got a 3.54 rear differential.
That makes sense! I was wondering how they were going to have different front and rear ratios without a constantly slipping center diff...
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Old 10-18-2017, 10:17 AM
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Old 10-18-2017, 10:22 AM
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Originally Posted by IS2Scooby
Here's what the Rallispec doc says re: FSTI and Spec B Ratios:
Interesting, I didn't realize the Forester got a 6spd in jdm land.

Either way spec.B/FSTI gearing is my favorite Subaru gearing.
Originally Posted by IS2Scooby
That makes sense! I was wondering how they were going to have different front and rear ratios without a constantly slipping center diff...
Yep rallispec has it listed under the TR column.
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Old 10-18-2017, 10:24 AM
  #43  
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Originally Posted by JourdanWithaU

Front LSD would be neat. I'm not sure I need it to the point of taking apart the transmission to put it in.
Have you considered a 5-speed with low range 2nd gear set?



I hear they are big down-under.
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Old 10-18-2017, 10:30 AM
  #44  
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Originally Posted by JourdanWithaU
It was off.

Tell Vlad it's 3.54. He said it was 3.9.
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Old 10-18-2017, 10:35 AM
  #45  
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Originally Posted by newyorkreload
I hear they are big down-under.
Oh I'll show you something big down under



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