('06-'08) MPT to VTD conversion - Subaru Forester Owners Forum
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post #1 of 191 (permalink) Old 07-18-2008, 07:16 PM Thread Starter
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MPT to VTD conversion



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/vbulle...87/#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 ) must assemble and install, however, this project will require the use of a shop press and some specialty tools (or their home made equivalent )

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

here they are side by side left MPT right VTD


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Attached Files
File Type: pdf 4eat.pdf (918.4 KB, 901 views)
File Type: txt vtd parts.txt (431 Bytes, 520 views)
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Last edited by a6n6d6y; 11-01-2008 at 09:21 PM.
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post #2 of 191 (permalink) Old 07-19-2008, 08:56 AM
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So you need the center diff, and a different tail housing?


Jr Tuned 35R'd 05XT Area1320 Block & IPT Race 4eat
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post #3 of 191 (permalink) Old 07-19-2008, 09:41 AM Thread Starter
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Quote:
Originally Posted by g00fy View Post
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


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post #4 of 191 (permalink) Old 07-19-2008, 01:12 PM
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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
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 for IPT.

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

Jr Tuned 35R'd 05XT Area1320 Block & IPT Race 4eat

Last edited by g00fy; 07-20-2008 at 06:36 AM.
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post #5 of 191 (permalink) Old 07-19-2008, 06:00 PM Thread Starter
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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

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


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Last edited by a6n6d6y; 07-19-2008 at 06:09 PM.
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post #6 of 191 (permalink) Old 07-20-2008, 11:52 AM
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nice I'll be keeping an eye on your progress.
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post #7 of 191 (permalink) Old 07-20-2008, 05:08 PM
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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?

Scott
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post #8 of 191 (permalink) Old 07-20-2008, 06:38 PM Thread Starter
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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


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post #9 of 191 (permalink) Old 07-21-2008, 12:12 PM Thread Starter
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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


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post #10 of 191 (permalink) Old 07-21-2008, 12:27 PM
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Andy, this is awesome. AFAIK, this is uncharted territory as far as 4eat mods. Does the VTD diff change the torque split or is it static? Are you able to bring on power induced oversteer?


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post #11 of 191 (permalink) Old 07-21-2008, 02:48 PM Thread Starter
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Andy, this is awesome. AFAIK, this is uncharted territory as far as 4eat mods. Does the VTD diff change the torque split or is it static? Are you able to bring on power induced oversteer?
static 45/55 with a clutch to lock the f/r together

yes


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post #12 of 191 (permalink) Old 07-22-2008, 03:52 PM
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I don't understand what you are doing with the FWD fuse. Is it just that this center dif doesn't need the TCU to tell it what to do? With the fuse in are you still AWD? I must say when it comes to the trans I'm lost and even more so when it comes to the diffs
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post #13 of 191 (permalink) Old 07-23-2008, 04:07 PM Thread Starter
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Quote:
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 but I am not finding any need for it anymore

Quote:
With the fuse in are you still AWD?

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


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post #14 of 191 (permalink) Old 07-23-2008, 05:59 PM
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I'm gonna need this mod ASAP this 20G is outragouse, I'm gonna end up toasting this center diff very quickly.

Jr Tuned 35R'd 05XT Area1320 Block & IPT Race 4eat
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post #15 of 191 (permalink) Old 07-23-2008, 06:47 PM Thread Starter
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Quote:
Originally Posted by g00fy View Post
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..???


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