Supercharging a Suby EJ25 ??

Bruce, you won't need all the power you already have. You'll be lucky to get any traction as it is.

While I agree with Paul, if you find out anything about it I'm sure there's a bunch of us that would be all ears! After all, you can never have too much power...

Yes, please keep us all informed of what you find out.

I  wouldn't even consider doing this until I've driven the car for a while. I drove a turbo'ed car a while back and spun it out easily coming out of a corner when the turbo finally came up to speed, then it was way too much to control the turn. In a straight line I absolutely loved the severe power surge and thats what got me thinking about blowers !  Not much to do right now so I might as well do some homework on nutty stuff like this.. Greg says it will be 3 more weeks  (I think more than that) before he gets anything started for me.............Bruce

I think that little Aisin one is cute and more suitable for like a 1.5. Maybe put one on each bank of a 2.5.

There are SC roots kits for Subies. 

And the inevitable How-To forums.

But all-in-all I suspect there's a reason so few people do it this way. I think if you want boost you just buy an STi motor and plumb the turbo to your own liking. 

Thanks for that lead Ed.............Bruce

Ed, I looked into doing it and my race shop Subie guys kept telling me, we can do it but for what it's worth let us do a turbo set up and you'll have oodles of power for a lot less.   I think Marty has a good set up with around 240hp and a bit less, turbo lag, kick making it a bit more N/A like ... 

if you could do a 3.0L subie 6 it would be 50lbs more but then you save 50lbs in turbo, intercoolers etc etc... it would be a bomb as it give about 240 n/a

• EZ30D: 2999CC DOHC, 245ps (180 kW) @6600 rpm, 297Nm@4200 rpm. Bore 89.2 mm, Stroke 80 mm. Compression 10.7:1. This version had three exhaust ports per head, a drive-by-wire throttle, a black plastic intake manifold, VVL and AVCS. It was available in manual and automatic unlike the old EZ30D. Found in the 2003–2009 Legacy 3.0R, Outback 3.0R and 2006–2007 Tribeca Engine horsepower reported as 250 hp, in Subaru of America publications in 2005. It made its debut in the 2005 USDM model year.

IaM-Ray posted:

Ed, I looked into doing it and my race shop Subie guys kept telling me, we can do it but for what it's worth let us do a turbo set up and you'll have oodles of power for a lot less.   I think Marty has a good set up with around 240hp and a bit less, turbo lag, kick making it a bit more N/A like ... 

if you could do a 3.0L subie 6 it would be 50lbs more but then you save 50lbs in turbo, intercoolers etc etc... it would be a bomb as it give about 240 n/a

• EZ30D: 2999CC DOHC, 245ps (180 kW) @6600 rpm, 297Nm@4200 rpm. Bore 89.2 mm, Stroke 80 mm. Compression 10.7:1. This version had three exhaust ports per head, a drive-by-wire throttle, a black plastic intake manifold, VVL and AVCS. It was available in manual and automatic unlike the old EZ30D. Found in the 2003–2009 Legacy 3.0R, Outback 3.0R and 2006–2007 Tribeca Engine horsepower reported as 250 hp, in Subaru of America publications in 2005. It made its debut in the 2005 USDM model year.

This is my my Subie:

The second generation of the EJ255 is used in the 2006-2008 WRX, the 2007+ Legacy, and the 2006+ Forester. It uses a slightly different cylinder block and cylinder heads. 
JDM Forester STI used VF41 turbocharger, WRX III - VF52 (0.92 bars). The Legacy GT up to 2009 used VH46 (0.96 bars, 250 hp at 6000 rpm). After 2009, the Legacy GT engine uses VH46 turbocharger produced 0.82 bars and 265 hp.

We deleted the CAT in the UP pipe to the turbo and replaced with Grimm Speed which adds another 10-15hp.  

@Marty Grzynkowicz 200 in subie is fun but 270 is more fun. I have to checkout the supercharger. I hope it fits under the hood 👍😇

I found out that the ASIN 500 super charger is only good up to 2.2 ltd engines. Too bad, I think it would've fit nicely right next to the alt..........Bruce

aircooled posted:

I found out that the ASIN 500 super charger is only good up to 2.2 ltd engines. Too bad, I think it would've fit nicely right next to the alt..........Bruce

Bruce,

You may want to read Ed's comment above.

Here's a picture of one that will work (Ed linked us to it):

Ed said:

edsnova posted:

I think that little Aisin one is cute and more suitable for like a 1.5. Maybe put one on each bank of a 2.5.

There are SC roots kits for Subies. 

And the inevitable How-To forums.

But all-in-all I suspect there's a reason so few people do it this way. I think if you want boost you just buy an STi motor and plumb the turbo to your own liking. 

Everything you'd need...

FWIW I think it's absolute insanity to stuff much more than 200 foot-pounds in these things unless both the suspension and the driver have been very upgraded. 

Also it's too easy to get too much power for the chassis. Much harder (and more rewarding) to make a well-balanced package. 

X2 what Ed said.  Unless you have the chassis and brakes to handle the power it's a waste of $$$$ and it will be less enjoyable to drive.  

FWIW, Stay away from the Sprintex. I upgraded a 2005 Mini-Cooper S with the kit Sprintex offered and I had 4 of their SC units go bad. They replaced each unit without much fuss but the labor to swap the SC out in a Mini Cooper is large so I had to either do it myself, 12-15 hours or pay $1200.00 to the shop each time which Sprintex would not cover. I also had to increase the injector size, install and larger intercooler and have the ECU remapped to get the car set up correctly. I did have a 280HP at the front wheels which was a hoot but man the cost was high and the end product was fragile. Sprintex may have a better SC product now but I would do your research first.

Jimmy...I talked to an owner of one on a Subaru. He's on his 2nd one now. He said that it's a snap to R & I but still, it's the idea that you have to do it even once. He thinks that either the quality of the material or the tolerances are bad. I have to say that it is a nice and clean installation but the price and the reputation are not...........Bruce

Not sure how Sprintex is in business. I guess they continually find new unsuspecting customers. Their kits a very pricey, maybe to cover the replacement S/Cer's they will be sending out. LOL.. It would definitely be easier to swap out the unit on a Subaru installation compared to the Mini Cooper, the entire front clip of the car must be removed along with the radiator and alternator.  I had my Mini 30 days and then took the front end of the car off to swap in the Sprintex. My wife was looking at me sideways..Lol.

edsnova posted:

FWIW I think it's absolute insanity to stuff much more than 200 foot-pounds in these things unless both the suspension and the driver have been very upgraded. 

Also it's too easy to get too much power for the chassis. Much harder (and more rewarding) to make a well-balanced package. 

Marty Grzynkowicz posted:

X2 what Ed said.  Unless you have the chassis and brakes to handle the power it's a waste of $$$$ and it will be less enjoyable to drive.  

@aircooled (Bruce) isn't that guy, gentlemen. The dude just polished a Subaru transaxle, and he's waiting for the first IRS Spyder Greg's ever made. He's been looking at A-arm front suspensions. I doubt he's going to cheap out on brakes.

It's valid to point out (I guess), but nobody tells Marty or Bob Carley they've got "too much". We live in a world with 700+ hp Mustangs. Part of being a car-guy is wanting at least a little bit more. 

"It's valid to point out (I guess), but nobody tells Marty or Bob Carley they've got "too much". We live in a world with 700+ hp Mustangs. Part of being a car-guy is wanting at least a little bit more."

Amen, Stan.  Henry did tell me of a Suby powered IM that is making around 350 hp, so that has Marty and me beat.  It all comes down to the overall build: how stable it is at speed, and how it is engineered to not go completely squirrelly when you hit the gas. 

Nice, fat wheels and tires on the rear help.  

To paraphrase Mel Brooks, 'It's good to have more power'.  

Guys, that's not out of line (money wise) for an aftermarket supercharger kit. A supercharger for the 4 liter Toyota V6 (later 4Runner and FJ Cruiser) is up around $5900. Ya gotta pay to play...

Stan said it best-

"Part of being a car-guy is (always) wanting at least a little bit more."