Yep it's Wednesday
10-18-2017, 09:09 AM
#17
What am I missing? Aren't most pre-2006 STi R180 rears 3.90?
Source - Rallispec
I mean, I know the math is complicated, but 1.0:1 transfer ratio times 3.90 final drive is.. uh.. carry pi.. 3.90?
*pre-2006. Mine is a 2006.
Source - Rallispec
I mean, I know the math is complicated, but 1.0:1 transfer ratio times 3.90 final drive is.. uh.. carry pi.. 3.90?
*pre-2006. Mine is a 2006.
My current R160 diff is 3.9.
Front LSD would be neat. I'm not sure I need it to the point of taking apart the transmission to put it in.
10-18-2017, 09:18 AM
#18
04-06 QQ
then they changed it for 07+
You could just find an 02-05 wrx r160 for the lsd
And then you'll need to disable traction control every time or they will constantly fight each other
You don't need cooling ports. in fact you don't need any of this yet, but of course you'll buy parts you don't need so that you don't have money to afford the parts you need. lulz
then they changed it for 07+
You could just find an 02-05 wrx r160 for the lsd
And then you'll need to disable traction control every time or they will constantly fight each other
You don't need cooling ports. in fact you don't need any of this yet, but of course you'll buy parts you don't need so that you don't have money to afford the parts you need. lulz
10-18-2017, 09:20 AM
#19
While this is only tangentially related and could easily be considered a threadjack, I'm old and sort of emotionally tone-deaf so....
No wonder my Fozchacho feels so edgy - the trans gearing and final drive are nutty!
Also, these specs show the US Forester XT as having the same ratios from 2004-2008 while I thought there were differences. Humph.
I wonder how much more mellow a 6-speed swap is going to make it feel.
3.454 / 1.947 / 1.366 / 0.972 / 0.738 / 4.444FD - '04-'08 Forester 2.5XT
3.636 / 2.235 / 1.521 / 1.137 / 0.891 / 0.707 / 3.900FD - JDM Forester STI
3.636 / 2.375 / 1.761 / 1.346 / 1.061 / 0.842 / 3.900FD JDM STI
3.636 / 2.375 / 1.761 / 1.346 / 0.971 / 0.756 / 3.900FD - USDM 2004-2006 Impreza WRX STi
3.636 / 2.235 / 1.521 / 1.137 / 0.971 / 0.756 / 3.900FD - USDM 2007-current Impreza WRX STi
Xcceleration
No wonder my Fozchacho feels so edgy - the trans gearing and final drive are nutty!
Also, these specs show the US Forester XT as having the same ratios from 2004-2008 while I thought there were differences. Humph.
I wonder how much more mellow a 6-speed swap is going to make it feel.
3.454 / 1.947 / 1.366 / 0.972 / 0.738 / 4.444FD - '04-'08 Forester 2.5XT
3.636 / 2.235 / 1.521 / 1.137 / 0.891 / 0.707 / 3.900FD - JDM Forester STI
3.636 / 2.375 / 1.761 / 1.346 / 1.061 / 0.842 / 3.900FD JDM STI
3.636 / 2.375 / 1.761 / 1.346 / 0.971 / 0.756 / 3.900FD - USDM 2004-2006 Impreza WRX STi
3.636 / 2.235 / 1.521 / 1.137 / 0.971 / 0.756 / 3.900FD - USDM 2007-current Impreza WRX STi
Xcceleration
Oh and,
with the fxt gearing, which I personally really enjoyed, my 20g didn't even feel much different in lowend from a vf39. hint hint
and then when soccer mom was late to practice, the little toaster would FLYYYYYY
10-18-2017, 09:26 AM
#21
Pr0n King
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remember the good ol days when we did RA gearset swaps when we blew up our "glass boxes"? we all thought they were stronger, when in fact they were simply more closely stacked which kept them alive much more effectively.
Oh and,
with the fxt gearing, which I personally really enjoyed, my 20g didn't even feel much different in lowend from a vf39. hint hint
and then when soccer mom was late to practice, the little toaster would FLYYYYYY
Oh and,
with the fxt gearing, which I personally really enjoyed, my 20g didn't even feel much different in lowend from a vf39. hint hint
and then when soccer mom was late to practice, the little toaster would FLYYYYYY
Mmmmmm, 20G!!!! I'm already so tempted. If I wasn't worried about this 110k mile engine expiring and the smog issues it'd be on there already!
10-18-2017, 09:31 AM
#23
Pr0n King
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Check out my effective ratio by gear heat map. A 6 speed swap could really change the way things feel. This (probably erroneously) assumed the 2007 STI has a 3.90 final drive.
Red = higher, yellow = lower.
P.S. I made you look at my tranny heat map.
Red = higher, yellow = lower.
P.S. I made you look at my tranny heat map.
Last edited by IS2Scooby; 10-18-2017 at 10:03 AM.
10-18-2017, 09:39 AM
#26
04-06 QQ
then they changed it for 07+
You could just find an 02-05 wrx r160 for the lsd
And then you'll need to disable traction control every time or they will constantly fight each other
You don't need cooling ports. in fact you don't need any of this yet, but of course you'll buy parts you don't need so that you don't have money to afford the parts you need. lulz
then they changed it for 07+
You could just find an 02-05 wrx r160 for the lsd
And then you'll need to disable traction control every time or they will constantly fight each other
You don't need cooling ports. in fact you don't need any of this yet, but of course you'll buy parts you don't need so that you don't have money to afford the parts you need. lulz
https://parts.subaru.com/p/Subaru_20...7011AB020.html
If ima *** wid it, I think I should go for the beefcake 180.
TC is usually off. I say usually because sometimes, I forget.
And...
Options don't hurt. I wouldn't be surprised if I run into cooling problems. So far, this stupid car has been and still is a mess of cooling problems.
10-18-2017, 09:43 AM
#27
Call me Pebbles
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Subaru parts says the 06 is 3.545.
https://parts.subaru.com/p/Subaru_20...7011AB020.html
If ima *** wid it, I think I should go for the beefcake 180.
TC is usually off. I say usually because sometimes, I forget..
https://parts.subaru.com/p/Subaru_20...7011AB020.html
If ima *** wid it, I think I should go for the beefcake 180.
TC is usually off. I say usually because sometimes, I forget..
But yes, 2006 STi had 3.54 R180 rear diffs.
See link below. Again.
10-18-2017, 09:43 AM
#28
Pr0n King
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Gear spacing heatmap comparing models. Yellow = farther apart, green = closer together.
P.S. Check out that huge jump from 1st to 2nd in the '04-'08 FXT. Every change is pretty wide compared to the JDM and 2004-2005 STI's (duh, 5 speed). Seems like a JDM STI is the closest-spaced box (also probably "duh" to everyone but me).
P.P.S. I pitted trannys against each other and made them fight for your edification.
P.S. Check out that huge jump from 1st to 2nd in the '04-'08 FXT. Every change is pretty wide compared to the JDM and 2004-2005 STI's (duh, 5 speed). Seems like a JDM STI is the closest-spaced box (also probably "duh" to everyone but me).
P.P.S. I pitted trannys against each other and made them fight for your edification.
Last edited by IS2Scooby; 10-18-2017 at 09:59 AM.
10-18-2017, 09:47 AM
#29
Pr0n King
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I just realized my randomly googled source of data contradicts Rallispec and a number of smart people in this thread and is probably wrong. Sorry. :-(
It doesn't show a different rear diff ratio until 2008.
Impreza WRX STi models:
2004-2006 manual transmission gear ratios:
1st - 3.636
2nd - 2.375
3rd - 1.761
4th - 1.346
5th - 0.971
6th - 0.756
reverse - 3.545
final drive ratio - 3.90
2007 manual transmission gear ratios:
1st: 3.636
2nd: 2.235
3rd: 1.521
4th:1.137
5th:0.971
6th: 0.756
reverse - 3.545
final drive ratio - 3.90
2008 STi 6 speed manual
1st 3.636
2nd 2.235
3rd 1.521
4th, 1.137
5th 0.097
6th 0.756
Front final gear ratio: 3.9
Rear final gear ratio: 3.545
It doesn't show a different rear diff ratio until 2008.
Impreza WRX STi models:
2004-2006 manual transmission gear ratios:
1st - 3.636
2nd - 2.375
3rd - 1.761
4th - 1.346
5th - 0.971
6th - 0.756
reverse - 3.545
final drive ratio - 3.90
2007 manual transmission gear ratios:
1st: 3.636
2nd: 2.235
3rd: 1.521
4th:1.137
5th:0.971
6th: 0.756
reverse - 3.545
final drive ratio - 3.90
2008 STi 6 speed manual
1st 3.636
2nd 2.235
3rd 1.521
4th, 1.137
5th 0.097
6th 0.756
Front final gear ratio: 3.9
Rear final gear ratio: 3.545