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Old 12-16-2009, 10:56 PM   #1
jedz123
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1993 Impreza L HB
EJ25D swap, 5-speed FWD

Default Best Turbo Project Options; Price, MPG, Reliabilty

Hey Guys
I've been knocking the FI idea around for a bit know for my 98 Legacy OB wagon. I would like more power and I'm pretty much reached the end of the line performance wise with my EJ25D, left to do is cams, pistons and Engine management... not worth the costs in my book. I really want to start a Turbo build or swap but not sure what route to take. I've heard the the EJ25D is rubbish for turbo apps but is it out of the cards totally?...

These are my goals:
Swap or Build that costs $2k at most, cheaper the better.
Decent MPG, Looking at EJ20 and EJ18 turbo builds or swaps.
A swap or build where I can utilize some of the original equipment(engine components, ECU harness etc)My EJ25D Cylinder heads are ported and polished.
Reliable, looking to get at least 50k miles out of the new motor.

Power/Performance goals:
At least 240 crank hp
0-60 in the mid to high 5 second range (currently is in the mid 7 sec range)
25-30mpg highway (Cruise set, no lead foot Currently average 19-22mpg)

I'd like to Keep the 4.11 transmission I like how the back end can come out easily. I know I'll need to upgrade the clutch, the stocker is starting to suffer from minor slippage with the modifications I've done to the EJ25D already. I would Run a top mount intercooler for I have the functional hood scoop.

I would like some recommendations on this!

I'm personally leaning towards an EJ18 turbo build, looks like something I could do easily my self.

I love this car it's just a bit under powered... The N/A EJ25D just doesn't cut it in my boat.

Thanks
-Jedz

The Legacy I want to do the swap in.
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Last edited by jedz123; 12-16-2009 at 11:12 PM.
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Old 12-17-2009, 12:59 PM   #2
2milehi
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If you can weld, $600 can get you this



6 psi boost, ZERO issues for the last 45k miles.
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Old 12-17-2009, 01:57 PM   #3
jedz123
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EJ25D swap, 5-speed FWD

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Is that A stock EJ25D with a turbo kit??? I heard that the motor couldn't take boost well... 6psi on my motor in theory would put me where I want to be. I'll send you a PM.
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Old 12-17-2009, 02:11 PM   #4
d3v0
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the compression is so high in the NA that 6psi is PLENTY
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Old 12-17-2009, 05:59 PM   #5
VIsubi
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The motor can take boost just fine 6-8 psi its when people like to turn it up that they have problems with it. Don't believe those dumb people that tell you it can't..its when they try to see how much is when it blows with a bad tune. get a good tune and you'll be fine brother. 600bucks is minus turbo and manifold and down pipe lol.On the real though 6 psi is fine with 10:1 compression. I will be doing this also very soon.
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Old 12-17-2009, 06:54 PM   #6
jedz123
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EJ25D swap, 5-speed FWD

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IF I go this route I plan on using the tiny fast spooling IHI turbo found on the Turbo Legacy, I have one in my shop. I'm gong to do some more research on this but I know the statistc of roughley 1psi=10crank hp. 6psi=60hp/$600= 1hp per $10... that is bang for your buck! 2milehi what are you using for EM? If any that is... I know the EJ25 bottom end is not nearly as strong as the EJ22, EJ20 or EJ18 one of my reasons I wanted to stay clear of using the EJ25D short block... But 2milehi if it's been reliable no reason I shouldent try it... Engine bay looks nice and clean by the way.

Last edited by jedz123; 12-17-2009 at 07:26 PM.
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Old 12-17-2009, 08:24 PM   #7
damonmlime
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An ej20g swap can be done for less than 2k if you shop around. Base model from wrx is 220hp and will get you about 25mpg mixed driving if you don't have a heavy foot.
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Old 12-17-2009, 10:46 PM   #8
jedz123
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EJ25D swap, 5-speed FWD

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Does any one know the mileage an EJ18t gets??? My buddy says he gets 25mpg in his 92 Legacy Turbo (EJ22T stock) with an Outback Tranny (4.11). I've looked at the WRX swap but parts in my neck of the woods for that particular swap is pricey... Can't find an EJ20 engine for under $1.5k and total cheapest I could do it for is about 3K and that includes several hours driving every which way to collect the parts... Besides I don't really want to run such a common swap. Bolt on kit looks decent but I know me and will need more juice after a couple of months, and running with the EJ25D won't fix my mileage problem... Going to look into EJ18 and EJ22 fraken builds more closely.
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Old 12-17-2009, 11:35 PM   #9
2milehi
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Quote:
Originally Posted by VIsubi View Post
...600bucks is minus turbo and manifold and down pipe lol...
I got the turbo, intercooler, up and down pipe, exhaust manifolds, mandrel bends, silicone hoses, WRX water pump, and the extra misc. stuff for $600. I cut the cross member and welding in a reinforcement. The intercooler inlet cost me a 12 pack to get a friend to TIG it in place. If you price out used WRX parts, you'll see that what I say is true.

I am running STOCK ECU, injectors, and fuel pump.
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Old 12-18-2009, 12:23 AM   #10
jedz123
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EJ25D swap, 5-speed FWD

Default

Quote:
Originally Posted by 2milehi View Post
I got the turbo, intercooler, up and down pipe, exhaust manifolds, mandrel bends, silicone hoses, WRX water pump, and the extra misc. stuff for $600. I cut the cross member and welding in a reinforcement. The intercooler inlet cost me a 12 pack to get a friend to TIG it in place. If you price out used WRX parts, you'll see that what I say is true.

I am running STOCK ECU, injectors, and fuel pump.
Awesome!!! Thanks! And your running 6psi? How is the power? Your mileage? If no EM is needed I could definitly get this project going for dirt cheap... Thanks buddy!
-Jedz
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Old 12-18-2009, 01:41 PM   #11
2milehi
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Quote:
Originally Posted by jedz123 View Post
Awesome!!! Thanks! And your running 6psi? How is the power? Your mileage? If no EM is needed I could definitly get this project going for dirt cheap... Thanks buddy!
-Jedz
Yes, I am running 6 psi. The power is way better than stock. Before the turbo, driving up a pass at 11,000 ft I would have to downshift into 4th and keep it there for most of the climb. Now I can accelerate from 45 MPH to 75 MPH in 5th gear. The turbo spools up pretty quick. The mileage is the same as long as I am driving calmly. Again, I have put 45k miles on this setup and the plugs looks great.
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Old 12-18-2009, 03:37 PM   #12
impreza_GC8
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2012 Ford Fusion 6MT (DD)

Default

Here's my build:
-EJ25 (NA) block halves
-EJ22T crank & rods
-EJ25 (NA) flat top pistons
-EJ20G intake manifold
-440cc injectors
-VF8 turbo (JDM Legacy RS)
-EJ22T OBD1 ECU merged with '97 Outback wiring harness
-EJ25 DOHC heads (M.Y. 1996 w/ hydraulic lift adjusters)
-catless 3" bellmouth downpipe
-3" SPT exhaust for WRX (modified to fit Legacy)
-EJ22T fuel pump
-2002 WRX top mount intercooler w/ custom Y-pipe
-short ram intake w/ cone filter and custom aluminum heatshield
-TurboXS bypass valve
-2000 2.5RS radiator cap (higher pressure than stock Outback)
-Hallman Pro MBC set to 11lbs

comes in around 2.4 liters with around 8:1 compression ratio

Good for stock WRX power, very reliable. Gas mileage is terrible right now because my OBD1 ECU doesn't allow me to tune the car for the larger injectors. Working on fuel management solutions now but in the meantime I still DD the car.



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Old 12-19-2009, 07:45 AM   #13
jedz123
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EJ25D swap, 5-speed FWD

Default

Wow man,That is a nice looking wagon. i am currently looking into doing a bolt on DIY kit. I am talking with someone right now to buy all the necsery hard ware to make the direct bolt on setup. 2milehi has a decent build that I could do for cheap, aparently the turbo will increase my mileage... Makes sence for I had 90 Dodge Daytona Turbo 2.5(T1 modified intercooled) that got low to mid 30mpg where as my Acclaim 5-speed of the same year with the N/A engine only got 25mpg. I plan on using the VF11 turbo from the 92-94 Turbo Legacys. I'm using it because its non laggy and has fast spooling abbilities. I would be only running 5-6psi so no need for a bigger compressor. ill keep you updated.

Last edited by jedz123; 12-19-2009 at 10:52 AM.
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Old 04-08-2010, 06:04 AM   #14
pawnone
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Ok guys I have the same idea but I have a problem.

first I have an ej22e in my 98 impreza with single port heads. I also have a full exhaust off a 02 turbo impreza just laying around. the problem is that I need dual port heads for the exhaust to fit, but I need to stay SOHC for my ECU.

my question is can I run 2.5 SOHC heads and maybe a larger gasket to lower compression. or are there such things as 2.2 dual port SOHC heads or will I need to use the 22t heads/gaskets and will my idea work after I pick up a TD04 and figure out the intake/intercooler situation.

oh and I am shooting for the safe 5 to 6 psi. starting low and eventually moving to around 5psi to be safe I am not a looking for too much power but I am sure I will be tempted to push 6psi sooner or later.

Last edited by pawnone; 04-08-2010 at 06:58 AM.
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Old 04-08-2010, 12:10 PM   #15
rivman05
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Pawnone, yes you can throw 2.5 sohc heads on a 22. It turns out to a 2.35 or damn close to it. It dumps the compression a bit tho, which allows for more boost on the top side. Its been done. I have everything to do this, just havent yet.
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Old 04-12-2010, 04:45 AM   #16
subi400
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I have been thinking of getting some 2.5 sohc heads to fit my 1996 impreza outback 2.2, port and polishing them, getting a better intake, exhaust, injectors and fuel pump. I would obviously have to get engine management at one point. But if you have other information about this set up with the vf11 legacy turbo then shoot me a pm
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Old 04-12-2010, 10:55 PM   #17
pheonix991
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http://www.rs25.com/forums/f7/t39629-boosted-ej25d.html

That guy swapped sti parts into a ej25d, made 600whp. Check it out, I'm just starting to research my next build for when my 25d blows.
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Old 04-19-2010, 08:02 PM   #18
cossie1600
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It will end up costing 35% of what you think, that's how it works
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Old 04-20-2010, 08:17 PM   #19
freeride
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Wondering what kind of Gas consumption other are getting on there RS-T

I run 94 octane with 5 psi of boost, wrx 440 injectors and wrx pump on my 2000 rs.

I run around a 13.5 A/F crusing which is a bit rich but its safer and 10.1 to 11 in boost. Fill up I get around 380-400 KM a tank with spirited driving.

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Old 04-21-2010, 08:00 AM   #20
MY99 2.5GT
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I'm glad to hear that its possible for some at higher altitudes to run a turbo kit at 6psi on their otherwise stock 98RS.

However keep in mind that the air is thinner up there and you most likely (most certainly) won't be able to run a similar setup at sea level without a precise tune and other supporting mods.

Brad
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Old 04-24-2010, 05:39 PM   #21
JasonBlessed
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im kicking around the idea of doing somthing similar. would the 600 dollar setup work on a 98 impreza with a stock 2.2 without having to change my heads?dont mean to hyjack the thread in any way but this was so similar to what i want to do i thought itd be dumb to make my own. i have a 94 legacy turbo doner car too. thx for ur help!!!
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Old 04-24-2010, 07:35 PM   #22
2milehi
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^^^ If the 2.2 has dual exhaust ports then it will work. I believe that the 2.2 is a single exhaust port for two adjacent cylinders and WRX manifolds will not work.
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Old 04-24-2010, 07:37 PM   #23
LilJeb
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subscribed. I'm also doing the turbo build in the next year or so.

I'd definetly like to start gathering stuff i need for the build. Whats the advantages/ disadvantages of running say... a td04 compared to running a vf39? can the Vf39 even be done on a stock ej25d impreza OBS motor?
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Old 04-30-2010, 11:09 PM   #24
sixgun4591
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I've been kickin around my 16g under the hood to see where it would fit the best-got some twisted ideas but still using the STI topmount.
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Old 06-16-2010, 04:52 AM   #25
pawnone
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ok guys I got almost all if the crap cramed into my 98 OBS and now I am thinking of getting a FMU. do I get a 12:1 or 10:1 unit?
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