[a6n6d6y]

this mod is intended for US vehicles without VDC as all others (AFAIK) allready have this type of differential

edit: looks like 2007+ XTs have this as an option as per http://www.subaruforester.org/vbulletin/f63/usdm-forester-specs-options-prices-all-years-34187/#post435339

this mod will do little for your vehicle unless your making A LOT of power

as you can see the diagram has the first half of the part numbers (for the most part)..I have a wad of papers that finished them by Year Motor etc

Edit by admin: parts list and diagram attached and downloadable below.

if you copy and paste the part numbers into one of the OEM parts sites you can get a total cost..(note the quantities on some of them)...and they will put them in a box and ship them to you..then you (or your favorite transmission shop :icon_wink must assemble and install, however, this project will require the use of a shop press and some specialty tools (or their home made equivalent :icon_idea: )

This article explains this diff well: see downloadable 4eat.pdf attachment below

once this is assembeled installing it to the transmission is fairly straight forward...if you have never opened an automatic transmission this may not be a job for you :evilatyou:

here they are side by side left MPT right VTD

 

[a6n6d6y]

So you need the center diff, and a different tail housing?

yes, if you are curious save the diagram and parts list and you can match up most of the stuff ...some of the numbers don't line up well ..the "G" parts start with "806" on the list then the number on the diagram, a little confusing but doable

 

[a6n6d6y]

Well odds are i'm gonna let IPT figure it out because the 4eat is far beyond my and many of my friends technical know-how. Glad to hear it just bolted right in with no issues, that should make it a quick job IPT.

I also had 1 more question andy, how's it feel to wake up in the morning and piss excellence?

it's temperd by the hangover from drinking it away the night before :biggrin:

also let me run it for a while to see how the TCU responds

 

[a6n6d6y]

I don't have an auto, so this doesn't apply to me. But I'm curious none-the-less. What are you up to here?

getting rid of the "not high horsepower friendly" MPT center diff and replacing it with one that is high HP friendly plus it just feels better driving with it..more balanced accelerating in turns

 

[a6n6d6y]

OK so the TCU responds well, the p0700 mil request went away as I expected.

I removed the FWD fuse and the car drove fine, a little tightness with the steering wheel hard over but no more than I would expect

I am going to leave the FWD fuse in so as to preserve the clutch pack as there is very little benefit to having the TCU control the AWD at this point ...maybe winter will change that , but for now I will let the diff do its thing

at this point I have to say this modification is a resounding success and I am extremely happy with it :woohoo::woohoo::woohoo:

 

[a6n6d6y]

static 45/55 with a clutch to lock the f/r together

yes :biggrin:

 

[a6n6d6y]

Is it just that this center dif doesn't need the TCU to tell it what to do?

that is correct, however it can be controlled by removing the fuse..plus I still have the manual lock :biggrin: but I am not finding any need for it anymore

With the fuse in are you still AWD?

yes, there is no way to disable the AWD with this diff.

 

[a6n6d6y]

I'm gonna need this mod ASAP this 20G is outragouse, I'm gonna end up toasting this center diff very quickly.

I made Ty aware of this mod and where to find it...they may be able to take the Diff off another trans instead of buying the parts new..???

 

[a6n6d6y]

Nice job! If the tcu were switched would full vdc be available?

AFAIK the VDC replaces the ABS computer and pump

but I don't see how that conversion would be economically feasible as there is a lot of other stuff involved with VDC

 

[a6n6d6y]

well I got around to launching the car today....holy crap What A Difference, felt like my seat back was going to break :woohoo:

no tire squeal or any of other BS the thing used to do it just jumped up and WENT

hopefully I will be at the track Wednesday and I'll see how much the 60' improves :rock:

 

[a6n6d6y]

well I got around to launching the car today....holy crap What A Difference, felt like my seat back was going to break :woohoo:

no tire squeal or any of other BS the thing used to do it just jumped up and WENT

hopefully I will be at the track Wednesday and I'll see how much the 60' improves :rock:

and now I see why :banana:

 

[a6n6d6y]

Did I just smoke crack or does that say a 1.657 sec 60 foot time and 3.323 second 0-60? Is this for real? With an auto box?

wel I'm NOT hanging out in the bathroom with ya ....today :biggrin:

but yea for real..check 1/4 mile registry

 

[a6n6d6y]

That 0-60 time is absolutely insane. Where did you get your torque converter from and what is the stall speed? Just out of curiosity, what will your car do for 0-60 from a roll?

IPT, stall is torque dependant...0-60 from a roll :huh:

 

[a6n6d6y]

do you have a slip from the track, or just the Gtech? Very nice numbers I so need to get my TC and valve body done... and maybe this swap while it's out. By the way when you had this all apart did you do all new clutches as well?

no just the fix and the VTD

 

[a6n6d6y]

I have a question couldn't you just take a WRX 4EAT and swap it in and have the same thing?

sorta ..the wrx 4EAT is not the 'direct control' system like the forester AFAIK

I looked into buying a used one for the parts but that was as much $$$$ if not more than buying the parts for the conversion new

 

[a6n6d6y]

that's good to hear that the stock clutches are holding up. I'm guessing you had the VB done early on before power got to high? I'm a little worried about mine as after the dyno session I could smell them a bit. I really need to send in my VB, I just can't seem to find the time to be without the car for a week.

I don't think your smelling clutches from inside your 4EAT it doesn't work like that...check your fluid if it's burnt looking/smelling then you've got problems

most likely you were smelling something else

 

[a6n6d6y]

This mod is on my to-do list. My car is tuned for some pretty aggressive acceleration, and with the STI steering rack thrown in the mad torque steer gets tiresome, especially on rougher roads (of which we have many). I've actually scared myself a few times while getting used to wrestling with the steering wheel.

Excellent work on putting the parts list together! Good thing my husband works in the parts dept. at the local Subaru dealer... :biggrin:

I've also backed up the parts list and .pdf file by attaching them to the initial post, in case the links go down.

and just to give everyone an idea of what this will do for well modified FXT, here's how much my 60' improved with just this modification

and I was making less power on the second set of slips (boost issue)

mods are:

Perrin EL header
P&L UP w/ 44mm tial EWG
DB td06-20g
TurboXS stealth back ,Cobb axle back
Perrin big maf
Perrin inlet
PE 650's
APS TMIC
Perrin PWI-1
IPT high stall TC

100oct + 100% meth

on drag radials

 

[a6n6d6y]

Plead Can you get a full parts list with the part numbers together for this. I couldn't figure out the matrix that Andy posted to figure out his numbers. Since you have the mad hook ups to the parts guy I would guess you could post a clear and easy to follow list. No offence Andy.. :biggrin:


Edit: never mind I just noticed there is now a parts list that I hadn't seen previously. Sorry.

I've been pondering what to say about this post for some time trying to figure out what you weren't seeing :huh:

 

[a6n6d6y]

What I AM seeing is an opportunity to take all the part numbers, put together a wholesale package price for interested parties, and fill the needs. I'll be all over it Monday morning after I get finished with my Monday morning chore list and a few other things at work.

By Monday evening, I'll have a package price worked out and then it'll simply be shipping quotes to interested parties.

are you going to be including the knowledge of how to disassemble and reassemble an automatic transmission in that offer :mob:

I would do it for locals ...but I'm not a vendor here....just sharing what I have figured out.............

 

[a6n6d6y]

so to touch on one of my earlier questions... are these parts the same as what is in a WRX 4EAT, or are these parts that are for newer/other market foresters? I don't know that it matters, but I was just wondering.

if you want to know you can go to a dealer and get the part numbers for the WRX and compare...that is how I put this one together only I looked up the parts for a FXT w/VDC