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Old 02-19-2005, 09:32 PM   #1
roadtalontsi
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Default aftermarket differential gearing?

Are there any available? I was wanting to go from 3.9, to something more like a 3.5 so the gears wouldn't be so short. I swear i remember hearing something about this before by someone just cant remember details. Changing front and rear differentials ofcourse.
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Old 02-19-2005, 11:42 PM   #2
zoophageousbeing
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I've not heard of anyone that sells higher final drive ratios. I know that www.rallispec.com sells lower final drive kits (4.11, 4.44), but not higher.
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Old 02-20-2005, 12:48 AM   #3
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Going from 3.9 to 3.5 would make you accelerate like a Buick. To my knowledge, Subaru doesn't make anything lower than 3.90, so you are doomed. You could get 4.11 or 4.444, is this what you mean? If you really want to go 3.5 or so, your only hope is to get taller wheels and tires to change your apparent final drive.
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Old 02-20-2005, 01:09 AM   #4
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Take that two grand in new diffs and dump it into head work extend your redline and make alittle extra power
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Old 02-20-2005, 04:08 AM   #5
roadtalontsi
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lol. The idea was more to be turning like 2000 to 2500rpms going like 80mph for highway. Like a buick? maybe a grand national . Eventually id get enough power to be beast like again. Oh well.... I have no idea why anyone would want even shorter gears. I wish our trannys were more like t56's from ls1's and vettes. where top of 5th does the likes of 180mph... and 6th is super econo. Thanks for trying to help guys.
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Old 02-20-2005, 10:49 AM   #6
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There's a reason why LS1 guys usually swap out their rears for 3.73s or 4.11s (from 3.42). It's because the stock gearing is strictly for gas mileage and not for performance. Also, they're a huge difference in the powerband of a 5.7L V8 and a turbocharged 2.0L.

For reference, here are the gear ratios of a LS1 T56:

1st gear = 2.66
2nd gear = 1.78
3rd gear = 1.30
4th gear = 1.00
5th gear = 0.74
6th gear = 0.50

final= 3.42

And here are the stock WRX:

3.454 (1st)
1.947 (2nd)
1.366 (3rd)
0.972 (4th)
0.738 (5th)

final=3.9

I have no idea why anyone would want taller gears. If you want better gas mileage, but a car that wasn't intended to be a performance car.
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Old 02-20-2005, 03:54 PM   #7
ebeck
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Yes exaclty.
Quote:
I was wanting to go from 3.9, to something more like a 3.5 so the
gears wouldn't be so short.
Then why were you asking for 3.5? Perhaps I am confused.

Want some serious performance gearing, look at the 6mt with 4.44.
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Old 02-20-2005, 03:58 PM   #8
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How much quicker would the STi running 1/4 mile at 133 mph in the upper 10 second range be if it were to change to the 4.444 gearing since? Or would it? I imagine it would depend on whether he is hitting 6th during that quarter mile.

Last edited by Nivek-CA; 02-20-2005 at 04:08 PM.
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Old 02-20-2005, 04:11 PM   #9
VTsuby
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Quote:
Originally Posted by roadtalontsi
lol. The idea was more to be turning like 2000 to 2500rpms going like 80mph for highway. Like a buick? maybe a grand national . Eventually id get enough power to be beast like again. Oh well.... I have no idea why anyone would want even shorter gears. I wish our trannys were more like t56's from ls1's and vettes. where top of 5th does the likes of 180mph... and 6th is super econo. Thanks for trying to help guys.
Yeah my measely 135hp and 3.90 cruises at 70mph at 3000rpm kind of defeats the purpose of a four cylinder
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Old 02-21-2005, 10:02 PM   #10
roadtalontsi
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I have no idea why people would want shorter gears. With exception to a strict track or rally car.

After first gear you shift every 20-25mph thats alot of wasted time shifting. I understand the power bands are different, and we lack low end torque but this is more about mid range tq. Once the car is moving power band wise ls1 and turbo 4cyl are similar..... peak tq is reached 3000ish.... higher the rpm the more hp. Watch when you shift holding to redline... your at like 5000rpms in the next gear, where as being right where the power starts at pk tq and starting to build towards the peak hp would help more . Even with a higher redline and bigger turbo, the car would still be at like 5500rpm+ after shifting, when a pretty good turbo would be producing target boost more like 4500rpm

Yea you could wine and say i should learn to drive... Im not complaining about shifting, i love shifting and can do it damn fast but you cant help escape the facts that making 6 shifts in the time another car may make 4.... thats alot of time lost. Not to mention extra wear and tear 5th and 6th are ment to be slammed in...not triple or even double synchro'd

Im open to thoughts and commentary, I realize most of you dont agree with me and i really dont care. Theres an obvious reason DRAG RACE transmissions usually only hit 4th gear in 1/4. Yes i realize this car is not for drag race blah blah. Im just trying to avoid a bunch of unconstructive commentary some tards will throw at me. Sorry for all the extra blah.
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Old 02-21-2005, 11:31 PM   #11
zoophageousbeing
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Okay, I see where you're confused. What you are looking for is not a higher final drive ratio. You want a tranny with a larger difference between the gear ratios. You don't want a close ratio tranny, you want a "far" ratio tranny. If you get a lower final drive, you will still drop the same amount of RPMs between each gear.
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Old 02-21-2005, 11:34 PM   #12
VTsuby
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He wants five speed ratios with sixth functioning as autobahn drive
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