Welcome to the North American Subaru Impreza Owners Club Tuesday November 19, 2019
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC General > Member's Car Gallery

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.







* As an Amazon Associate I earn from qualifying purchases. 
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 09-26-2017, 03:22 PM   #1
MadMaximus
Scooby Newbie
 
Member#: 465517
Join Date: Apr 2017
Chapter/Region: NESIC
Location: Lowell, MA
Vehicle:
2006 Impreza
Grey

Default Supercharged 2.5i Build Thread



I have been asked many times to start a build thread, and I've only hesitated because I wanted to have proof of concept before starting a thread.

I started this build with little knowledge about modifying motors and a completely stock 2006 Impreza 2.5i. I drove the car for 4 years before tearing into it, so don't feel bad for it.

I don't find much enjoyment in doing common modifications. Not because I'm a hipster, but because I enjoy testing my problem solving abilities and general intuition. After 4 years with the car, it began to feel sluggish and boring. The easiest thing to do would've been to trade it in for a turbo car, or swap it for a turbo motor. Those options didn't feel like things I would personally do. So why not just build my own budget boost kit?!

I'm a M.E. student and have some idea how to design and fabricate things, so I figured I could manage a supercharger kit with relative ease. And thus my planning began. I set my sights on the Eaton M90. Other Imprezas have been built with M90's and smaller M62's in the past, so with some searching I managed scrounge up what little information exists about them. Some threads helped, others did did not.

I began by tearing into my motor. The sad stock Ej253 had spun a bearing and had to be discarded. This left me with a set of heads and an intake manifold. Then I acquired an M90. I spent a few weeks designing different mounts and SC locations with little to no success. A lightbulb turned on in my head, "What if I top mounted it like a V8???" BAM! My sights were set. In order to fit the Eaton up top dead center I would have to rotate the intake manifold so the hot-side of the SC could be accessible.



After some measurements and head-to-wall exercises I designed what I deemed a "Spider Mount" for the SC. Picture below shows it dimensioned to the manifold. It bolts into the injector cover holes (which lay flat in-plane with the crank).

* Registered users of the site do not see these ads.
MadMaximus is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 09-26-2017, 03:41 PM   #2
MadMaximus
Scooby Newbie
 
Member#: 465517
Join Date: Apr 2017
Chapter/Region: NESIC
Location: Lowell, MA
Vehicle:
2006 Impreza
Grey

Default

A friend of mine helped me along this process. He has many years in fabrication and was indispensable for completing the mount and general get-it-running properly stuff. I sent him my SolidWorks files and he laser cut the legs. I had to be sure it would fit the car so I decided to cut the SC bottom plate myself. After a night of swearing and angle grinding I was left with a somewhat complete mount!

Whilst the SC mount was being built I was building a frankenstein block in my basement. Traded my OMP steering wheel, Sparco quick release, and NRG shorthub for an Ej257 shortblock. After all the old oil was removed I got to work putting it together with new ARP headstuds and faith. Minor mess-ups along the way (retapped two holes for the waterpump and one intake manifold hole) but it somehow managed to come together! Used KSTech phelonic spacers in order to rotate the intake manifold, really liked their fitment, easy install. Installed an ACT HDSS and called it good enough. After carrying the motor up my basement stairs, had some friends over and got it installed on my birthday. WOOO!



After a day of piping I had this.



A major issue with the piping was not apparant at this time, but I'll get into it later.

For those interested, the car was is on General Grabber AT2 235/70/16's with Enkei RS-01 16x7 +38 and 2" spacers in order to clear my struts. Car is now lifted with Forester suspension and top hat spacers.
MadMaximus is offline   Reply With Quote
Old 09-26-2017, 03:50 PM   #3
MadMaximus
Scooby Newbie
 
Member#: 465517
Join Date: Apr 2017
Chapter/Region: NESIC
Location: Lowell, MA
Vehicle:
2006 Impreza
Grey

Default

Turns out that the internal BPV on the M90 won't work without the whole supercharger being in vacuum. I originally had just put on a BOV (thinking the stock internal BPV was broken) and dumped all the excess air coming out of the screaming SC. This meant that since the SC was pushing the throttle body, it was ALWAYS at full boost, causing it to get very hot and self destruct a few weeks later. Here's the aftermath:





So for those interested, you MUST run a TB before the supercharger in order to reduce stress on the needle bearings, screws, and to massively reduce heat. I had two superchargers fail me before I figured this out. One ate the housing and the backs of the rotors melted to the housing, and the other shot all of its Teflon through my running motor...

My current piping setup is lacking an intercooler (will post updates). It doesnt absolutely need one, but it would be better with one. Putting the SC in vacuum made my SC temps drop SIGNIFICANTLY. Saving me many headaches and wallet stuffings.

MadMaximus is offline   Reply With Quote
Old 09-26-2017, 09:55 PM   #4
JarHarms
Scooby Specialist
 
Member#: 138994
Join Date: Jan 2007
Chapter/Region: MWSOC
Location: DeKalb-ish, IL
Vehicle:
06 WRX Ltd
SGM

Default

Wow. That's wild .
What are you using for Engine Management?
JarHarms is offline   Reply With Quote
Old 09-26-2017, 10:33 PM   #5
MadMaximus
Scooby Newbie
 
Member#: 465517
Join Date: Apr 2017
Chapter/Region: NESIC
Location: Lowell, MA
Vehicle:
2006 Impreza
Grey

Default

Quote:
Originally Posted by JarHarms View Post
Wow. That's wild .
What are you using for Engine Management?
Im just open sourced on the stock ecu. Been tuned twice to get it running safely. Havent tuned for power yet, waiting till I'm confident in it making solid power. Have some upgrades in the works.
MadMaximus is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -4. The time now is 05:57 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2019 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.