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Old 12-31-2012, 01:55 AM   #1626
Uncle Scotty
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Quote:
Originally Posted by Vlad View Post
Here is some info which may help some..

Some research I did suggests that the R180 in an '07 Sti is heavier than the R180 in an '06 Sti, possibly adding as much as 20 lb.
This is because the '07 has a torsen limited slip locker, while the '06 has a mechanical, clutch-style locker.

Since the weight difference is rotating mass, it's effects may be equivalent to more than 20lb of weight savings.

A theory I have, which is not verified yet, is that the '06 and '07 6 speed transmissions are heavier than the '04-'05 by quite an amount.
I don't really know what it is, I am thinking it may be 40 lb.
This has to do with the center differential. The '06-'07 have an additional torsen locker, again rotating mass.

FIY, for the JDM cars, the years and nature of diff changes were the same as US. However, for the Spec C, they never went to rear Torsen, although they did so for Sti. I never looked into the center torsen for spec C, but I can look into it.

If you're looking for reliable, low mileage swaps, the JDM swap places usually have low mileage items. However the JDM 6 speed have shorter 5th and 6th.
They always have the same final ratios as the same year USDM Sti.

this #20 is really irrelevant as it is so low in the chassis...rotating or not...it isnt as big a deal as other rotating mass

im gonna get a cf driveshaft and not care a bit about the rear diff
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Old 12-31-2012, 11:03 AM   #1627
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Quote:
Originally Posted by Uncle Scotty View Post

this #20 is really irrelevant as it is so low in the chassis...rotating or not...it isnt as big a deal as other rotating mass

im gonna get a cf driveshaft and not care a bit about the rear diff
Not to mention its so small in terms of size that it doesn't have the same effect a lw flywheel or lighter wheels will have. The only reason to swap diffs would be dependent on which style LSD you prefer.
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Old 12-31-2012, 12:05 PM   #1628
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I find it hard to believe they could stuff 20 more lbs into the rear differential, just by changing from a clutch type lsd to a torsen. There just isn't enough room in there for 20 more lbs of crap. The differential housings on these cars are so small.

I'm also having a hard time believing the the added torsen unit to the center differential weighs 40lbs. That may be a generous guess.
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Old 12-31-2012, 12:42 PM   #1629
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The 40 lbs for the center diff IS a guess (I think it may be 40), but anybody that wants to help me find a factual aswer, as to the extra weight of the '06-'07 torsen center, is welcome to do so.
We can make educated guesses, but maybe someone has the physical info.

As far as the R180, I can't say that I've found someone that weighed both, but I found two sets of weight info, from misc sources, when comparing the overall weight of an R180 with that of a WRX R160.

The construction of the torsen could (I am not giving this as a fact) have 3 pairs of worm gears in the R180 and to me it's plausible that those can be heavier than the clutch pack for the mechanical.

The R180 with clutch pack in the Spec C is a fact, via part number.

I just want to point out, as you guys start to search the threads, that the threads from 2006-08 have a level of confusion in them, as some were disputing at the time that torsen were installed in the R180, watch for that.
The reality, via part number check, is that they were and they started to be there for the year model '07.
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Old 01-01-2013, 12:01 PM   #1630
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Quote:
Originally Posted by tachrev View Post
I find it hard to believe they could stuff 20 more lbs into the rear differential, just by changing from a clutch type lsd to a torsen. There just isn't enough room in there for 20 more lbs of crap. The differential housings on these cars are so small.

I'm also having a hard time believing the the added torsen unit to the center differential weighs 40lbs. That may be a generous guess.
This.
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Old 01-07-2013, 11:32 PM   #1631
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Default weight reduction exercise

My 2 year old son plays with his cars rough so i had a bunch of broken cars laying around , these are the little pull-back racers at drug stores. the modded one is a skyline.

So the Evo and STi are "stock" and the all silver is the Modded one. Here is how i did it.




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Old 01-07-2013, 11:36 PM   #1632
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You made it all wheel drive?
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Old 01-07-2013, 11:37 PM   #1633
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weights of the other cars were around 4oz. if i remember right and the modded was 2oz. i'll try to find pics of that if any one really wants to see them.

it was a fun thing to do in place of working on my car it's on the back burner for now.
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Old 01-08-2013, 06:36 AM   #1634
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Nice mod. My son has one of those little Subaru cars as well. Might need to make it AWD.
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Old 01-08-2013, 07:39 AM   #1635
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So I got an answer about a Sti optional Mechanical center differential, it's weight is about 17 lb.
So I have to revise my estimate to 17-20 lb extra for the 2006-2007 6 speed with torsen center diff.

Also I found that the total weight of a torsen rear for a Mustang is 26lb. So therefore the extra weight of a torsen R180 could not be more than a few pounds.

So the total extra drivetrain weight of a 2007 vs a 2004-2005, I am estimating between the 6 speed and the R180, little over 20 lb, rotating mass.
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Old 01-08-2013, 01:11 PM   #1636
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Quote:
Originally Posted by jimbosv650 View Post
You made it all wheel drive?
Yes Sir,
But it can be rwd or fwd and twin engine. I should have taken pictures of the first test it was spinning the rims inside the tires for a few inches so i glued the tires to the rims.
It would be nice to set up one motor for acceleration and one for distance that would let it get going then the other motor would take over and keep it moving . I am way over thinking this
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Old 01-08-2013, 02:48 PM   #1637
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Quote:
Originally Posted by Vlad View Post
So the total extra drivetrain weight of a 2007 vs a 2004-2005, I am estimating between the 6 speed and the R180, little over 20 lb, rotating mass.
and is, like too much here, irrelevant
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Old 01-14-2013, 08:38 PM   #1638
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Love this thread.
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Old 01-18-2013, 02:02 PM   #1639
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anorexic exhaust

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Old 02-10-2013, 10:22 PM   #1640
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I have ordered a 4-point bolt in roll cage with harness bars on each side although I won't be installing it until I buy a new daily driver car some time soon.

I'm planning on removing AC, carpet, roof lining, back seats and seat belts before installing the cage, hopefully that will be enough to offset the extra weight. At least the weight distribution will be a little better too by adding the cage toward the rear of the car and removing the AC from the front.

Last edited by JDwhiteWRX; 02-11-2013 at 10:15 PM.
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Old 02-11-2013, 02:58 AM   #1641
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well.....i finally installed the oswald lw front bumper beam.....and it is
taking whatever weight it ends up being---about 21 or so pounds i guess...off the front of the car so far foreward REALLY makes a difference in the way the car drives

i figure that i have taken somewhere around(im NOT l00py d00p and weigh everything to the bleeding gram like some here do ) 125 pounds off the front of the car now, i guess...maybe a lil more

and that seems to be the key to the gd chassis......taking the weight off the front is magic for the way it drives....too bloody marvelous

now for the #3 li battery and a rear bumper beam and a few other goodies and it should be about done

Last edited by Uncle Scotty; 02-11-2013 at 03:09 AM.
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Old 02-11-2013, 08:24 PM   #1642
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^^^Nice! I did the Oswald front beam too. What's your thought on leaving the OEM rear bumper beam alone simply for better weight balance? I realize overall weight reduction is ideal, but I've been thinking it might be good to keep that extra weight at the extreme rear to help the car rotate. Plus the rear beam install seems like a PITA.
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Old 02-11-2013, 08:57 PM   #1643
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Quote:
Originally Posted by thrasher View Post
^^^Nice! I did the Oswald front beam too. What's your thought on leaving the OEM rear bumper beam alone simply for better weight balance? I realize overall weight reduction is ideal, but I've been thinking it might be good to keep that extra weight at the extreme rear to help the car rotate. Plus the rear beam install seems like a PITA.

meh....you can weight jack the car with the suspension.....that extra #25 or whatever ya save with the rear beam is worth it
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Old 02-11-2013, 09:05 PM   #1644
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Quote:
Originally Posted by Uncle Scotty View Post
(im NOT l00py d00p and weigh everything to the bleeding gram like some here do )
Yea we do that for the sake of the community so that other people can know what stuff weighs, but good job being sarcastic on our behalf.
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Old 02-11-2013, 10:26 PM   #1645
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Yea we do that for the sake of the community so that other people can know what stuff weighs, but good job being sarcastic on our behalf.

and i do that to the idiots who are so glaringly obsessed with this and who do such INCREDIBLY stupid things to their cars in order to save an ounce or 2
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Old 02-12-2013, 01:06 AM   #1646
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Originally Posted by Uncle Scotty View Post
and i do that to the idiots who are so glaringly obsessed with this and who do such INCREDIBLY stupid things to their cars in order to save an ounce or 2
Go fill your transmission with an untested chemical blend about it, hoss
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Old 02-12-2013, 06:59 AM   #1647
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Quote:
Originally Posted by Uncle Scotty View Post
well.....i finally installed the oswald lw front bumper beam.....and it is
taking whatever weight it ends up being---about 21 or so pounds i guess...off the front of the car so far foreward REALLY makes a difference in the way the car drives

i figure that i have taken somewhere around(im NOT l00py d00p and weigh everything to the bleeding gram like some here do ) 125 pounds off the front of the car now, i guess...maybe a lil more

and that seems to be the key to the gd chassis......taking the weight off the front is magic for the way it drives....too bloody marvelous

now for the #3 li battery and a rear bumper beam and a few other goodies and it should be about done
Welcome to the new millenium.

Quote:
Originally Posted by Uncle Scotty View Post
and i do that to the idiots who are so glaringly obsessed with this and who do such INCREDIBLY stupid things to their cars in order to save an ounce or 2
"My name is Uncle Scotty, I am a motivational speaker, and I live in a WRX down by the river."

How's that steady diet of government cheese working out for you brother?
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Old 02-18-2013, 11:15 PM   #1648
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Quote:
Originally Posted by Splinter View Post
Go fill your transmission with an untested chemical blend about it, hoss
Quote:
Originally Posted by A-man07 View Post
Welcome to the new millenium.



"My name is Uncle Scotty, I am a motivational speaker, and I live in a WRX down by the river."

How's that steady diet of government cheese working out for you brother?




couple cupcakes thinkin they all k00 an ****, here

ya gotta love it

they tryin...and failin, hard

what's for an encore, girls????

MORE bein stupid, doin more stupid things, thinkin more stupid ****
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Old 02-19-2013, 12:16 AM   #1649
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Old 02-19-2013, 08:59 AM   #1650
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