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Old 04-05-2009, 04:40 AM   #1
tony_0227
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Default 1.8 n/a to 2.5 n/a

i have a 93 L with a 1.8. i have a 98 2.5 dohc n/a. my question is how hard will it be to swap the 2.5 into my L. i have read that all i have to do is swap the throttle body over and i can use my 1.8 ecu to run the motor is this true thanks for the help
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Old 04-06-2009, 07:34 AM   #2
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I don't think you'll even have to swap the TB over. The IAC's wire up and run similar, even though they are physically different. Just swap the EJ18 engine harness over to the EJ25 and plug the sensors in, swapping over any of your original ones that aren't on the EJ25. The ECU for the EJ18 doesn't look for a knock sensor and I don't know if you have an EGR system on your current motor. The EJ25D will have the EGR system, which you can leave alone or remove and block off. Add in a tube between the intake (after the MAF) and the IAC, then motor on.

The ECU will run the motor fine, even though it's bigger. You may want to look into a piggyback fuel controller to dial it in a little better, but it's not necessary.

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Old 04-06-2009, 10:15 AM   #3
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i believe you should be able to keep your 1.8 harness, just plug it into your 2.5 sensors. keep the 1.8 throttle body, you need it for idle control. the only parts you are changing are the 2.5 block and intake manifold.. not sure if the 1.8 exhaust manifold with bolt up. I believe the clutch is the same between 2.5 and 1.8 too
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Old 04-06-2009, 05:27 PM   #4
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I used the EJ25D's external IAC with no problems. It's a 3 wire solenoid. I don't remember if I even had to change the plug end or not. I think it was plug and play on that sensor. There are a couple different sensors between the 2 motors....but it's been so long since I did that particular swap, my memory is a bit foggy. I know that it was an afternoon swap and I simply put the EJ18 harness on the EJ25, and dropped it in the car.

Both are sidefeed injectors, so the clips are the same, almost everything is identical....even the coil!

Jay
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Old 04-08-2009, 02:16 AM   #5
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very cool i was thinking of turboing it not shure though the head gaskets are blown so i have to change them anyway. what would i have to do to tubo the motor since it is a n/a motor to begin with thanks for the help
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Old 04-08-2009, 06:59 AM   #6
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If you want to run more than 6psi, you'll need more than just headgaskets.

If you're going to go turbo, do it once and do it right. A basic WRX swap, including harness swap has been coming down in price over the years. It's your best, most reliable option.

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Old 04-08-2009, 11:25 PM   #7
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Quote:
Originally Posted by Storm View Post
If you want to run more than 6psi, you'll need more than just headgaskets.

If you're going to go turbo, do it once and do it right. A basic WRX swap, including harness swap has been coming down in price over the years. It's your best, most reliable option.

Jay
yea i know but i allredy have a 2.5 what would i need to torbo it. new pistons, rods, ect, ect. thanks for the help
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Old 04-10-2009, 12:32 AM   #8
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I wouldnt suggest going from 1.8 liters of fury, to a turbo EJ25 motor. You go from 110 hp motor, to 165hp motor, 50% increase in power. I would swap in the EJ25 and get used to the car, then in a year or two, swap in (or make your own) a turbo motor.

But if you are adament that you "need" to have a turbo motor, there are many options. Some reading/searching will find you all the answers you need, as well as raise more.

Why isnt there a " turbo your car" FAQ? This comes up so often...



~Josh~
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Old 04-10-2009, 11:22 AM   #9
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^^^ Because it's a GC body. No love here......



Jay
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Old 04-11-2009, 03:11 AM   #10
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thanks for the imput i am still looking at what i want to do. i know i want to turbo it i just want to do it right the first time. is there a diffrence from sti and forged parts. sorry for all the questions this is my first build i am doing myself thanks for all the help
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Old 04-11-2009, 08:43 AM   #11
19200
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Default Swap

I have a similar setup. Works well, except I have a flat spot at about 4500 rpm where it goes lean.

Anyone run into this issue?

Thanks!
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Old 04-12-2009, 07:03 PM   #12
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k i have decided to keep it n/a what are some good cams for the motor
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Old 04-12-2009, 09:50 PM   #13
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Delta Cams are your cheapest option.


Jay
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Old 04-12-2009, 11:21 PM   #14
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i am also looking for a 2.5 na motor to give my DD some more power over stock where is the best place to look?

Shawn
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Old 04-14-2009, 01:17 AM   #15
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Quote:
Originally Posted by Storm View Post
Delta Cams are your cheapest option.


Jay
was looking at those friend of mine said that they worked well for him. are has anyone used other brands
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Old 04-14-2009, 06:51 AM   #16
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IMHO...."other brands" are way too expensive to even be considered. Nobody else has "off the shelf" grind profiles for an NA application....it's literally ALL for turbo motors. The only logical choice is Delta Cams. They are happy to make cams designed for NA Subarus.

Jay
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Old 04-14-2009, 06:45 PM   #17
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Quote:
Originally Posted by Storm View Post
IMHO...."other brands" are way too expensive to even be considered. Nobody else has "off the shelf" grind profiles for an NA application....it's literally ALL for turbo motors. The only logical choice is Delta Cams. They are happy to make cams designed for NA Subarus.

Jay
cool thanks for the help
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Old 05-01-2009, 08:13 AM   #18
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Quote:
Originally Posted by 19200 View Post
I have a similar setup. Works well, except I have a flat spot at about 4500 rpm where it goes lean.
I've done a fairly extensive search on this swap and it seems this 'lean' 'flat spot' is common.

Quote:
Originally Posted by Storm View Post
You may want to look into a piggyback fuel controller to dial it in a little better, but it's not necessary.

Jay Storm
Is that the perpose of the piggyback fuel controller? Is there another way to address the issue? Larger injectors?

I'd like to do this swap with my rally car but don't want to have a lean spot...

Thanks
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Old 05-04-2009, 11:01 AM   #19
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Quote:
Originally Posted by urabus555 View Post
I've done a fairly extensive search on this swap and it seems this 'lean' 'flat spot' is common.



Is that the perpose of the piggyback fuel controller? Is there another way to address the issue? Larger injectors?

I'd like to do this swap with my rally car but don't want to have a lean spot...

Thanks
That is what I did. I didn't have problems afterwords. YMMV....


Jay
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Old 05-04-2009, 03:53 PM   #20
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Quote:
Originally Posted by Storm View Post
That is what I did. I didn't have problems afterwords. YMMV....


Jay
Sorry about the way I asked the question...

I'm assuming that you went with the piggyback fuel controller (not the larger injectors). Which controller did you use?

Thanks
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Old 05-04-2009, 05:40 PM   #21
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^^^ I used an SAFC to dial in the fuel a bit better. I had just come off a 13hr roadtrip, I didn't answer the way I was thinking.....

Jay
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Old 05-04-2009, 07:09 PM   #22
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Quote:
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^^^ I used an SAFC to dial in the fuel a bit better. I had just come off a 13hr roadtrip, I didn't answer the way I was thinking.....
Care to give a rough idea of your S-AFC settings? This is a fairly common swap and the S-AFC can be had cheap from any number of Honda guys.
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Old 05-04-2009, 10:45 PM   #23
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I can do one better.......I'm not using my SAFC anymore, and the settings should stay permanent during shipment. Make me a reasonable offer and I'll carefully remove the harness from the car.


Jay
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Old 05-14-2009, 09:46 AM   #24
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would installing 2.5 dohc n/a from 2004+ impreza be better or have the same issues as mentioned?
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Old 05-27-2009, 02:11 PM   #25
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Quote:
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I can do one better.......I'm not using my SAFC anymore, and the settings should stay permanent during shipment. Make me a reasonable offer and I'll carefully remove the harness from the car.
Thank you for the offer. I wasn't asking for my direct benefit though,,, I am in the process of a ej22 to ej25 swap! The settings would probably help future swappers and I already have an S-AFC in my closet somewhere.

I want to make my own purely mechanical tuning device. I will put a barbed fitting on the air filter box with a ball valve and then plumb that in after the MAF. This will let me induce a small "leak" and lean the system out as needed. I will be using slightly larger injectors than the ECU had. Unfortunately this system cannot richen the car but that can be done by putting a gob of JB weld into the MAF thereby reducing its diameter.

Yeah I'm ghetto like that
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