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Old 03-08-2001, 06:57 PM   #1
Rovah
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Post '99 engine swap into '98 RS

Due to some trouble with my '98 motor, I was faced with either a rebuild or a used motor.

I found a '99 2.5 and have the ECU and ECU harness connectors. Any aspect of this swap that I need to be aware of between the '98 car and the '99 engine?

Any help is appreciated! John
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Old 03-08-2001, 07:20 PM   #2
Impreza Rider
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I *think* that the number of bolts is different for the tranny.

Jim
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Old 03-08-2001, 07:42 PM   #3
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<FONT face="Comic Sans MS">The number of bolts are different yes (4 instead of 7) but you will be fine with just the 4. My only worry is the ECU... you have a DOHC in the 98 and a SOHC in the 99 IIRC.

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Old 03-08-2001, 09:02 PM   #4
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You already have the '99 ECU? You will probably want the entire wiring harness.
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Old 03-08-2001, 09:11 PM   #5
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It would seem that he has both.

Quote:
have the ECU and ECU harness connectors
Jim
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Old 03-09-2001, 04:47 AM   #6
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Yes, I am putting in a '99 SOHC motor in place of the '98 DOHC. The engine harness is complete and I will have the ECU and ECU connectors with a pin-out diagram so that I can put the connectors on my existing harness.

As I understand it, the connectors for the ECU are the big difference with this swap as the '99 ECU won't bolt to the '98 harness...

Thanks for all the feedback! John
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Old 03-09-2001, 05:01 AM   #7
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Someone in Maine owns an RS? My hometown is Machias, ME. I'm mechanically retarded but would it be possible to drop in a Legacy motor? If it was possible you could drop in a turbo later and crank up the boost.
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Old 03-09-2001, 05:25 AM   #8
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Save yourself the trouble. You don't need the wiring harness or ECU. The engine will drop in and run fine with the stock '98 ECU. The fuel curves will be fine, and I can't imagine the timing would be that much different.

The only issue would be the injectors and fuel rail. You will need to keep the '98 injectors- I'm not sure if they (and the fuel rail) are the same for '99.
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Old 03-09-2001, 07:34 AM   #9
ColinL
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I don't think the fuel rails are interchangable at all.

Would the 98 ECU really work though? I thought the MAF input was totally different. Of course I only speculated that since several have tried and failed to adapt the robust 98 hotwire MAF to a 99.
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Old 03-09-2001, 08:40 AM   #10
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If he uses the '98 ECU couldn't he just use the '98 MAF too?

Come to think about it, this would be something I would strongly consider doing... you get the better SOHC phaseII engine with a seemingly unbreakable MAF!

[This message has been edited by AccidenT (edited March 09, 2001).]
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Old 03-09-2001, 09:17 AM   #11
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So, are you saying that I should use the '98 ECU and airflow meter with the '99 engine?

Can this be done? What are the concerns about the fuel injectors? Is it a different system?

Thanks for all the great feedback guys! John
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Old 03-09-2001, 09:25 AM   #12
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The '99 uses a different intake manifold. The fuel injectors and/or fuel rail may or may not be different. What you want to do is use ALL the '98 stuff. Just put the '99 motor in. You just need to check whether the fuel rail and injectors for the '98 will fit the '99 manifold. If not, then you need to check whether the '98 injectors will fit the '99 fuel rail. If not, you need to make sure that the '99 injectors flow the same as the '98s, and have the same impedance. If they do, you can use the '99 injectors and rail with no problems. In no case do you have to swap out the wiring harness and ECU. In fact, I would be happy to take that ECU off your hands. (No, I didn't post all this just to buy your ECU!).
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Old 03-09-2001, 03:53 PM   #13
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So, does anyone know the flow rates and impedences of the fuel injectors of the '98 versus '99?

Hope so, 'cause I don't! :-) Have a great weekend! John
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Old 03-09-2001, 04:20 PM   #14
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Hello,

Contact Shiv for a for-sure answer on the compatibility of the injectors and rails. He has mine still from when he machined his "jammy fuel rails". I know he has different rails for the '98s and '99s because of fitment issues with the intake manifold.

I believe the only difference is the feed, not the values or flow rates...

Joel
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Old 03-09-2001, 04:23 PM   #15
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just a thought
can you use the 99 shortblock with your 98 everythng else? wouldnt that make things much easier?
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Old 03-09-2001, 04:55 PM   #16
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I think the Legacy 2.2l Turbo would be better. Just my opinion though.
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Old 03-10-2001, 09:38 AM   #17
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I'll send Shiv a note and see if he knows.

The reason for the engine swap is some nasty piston slap and maybe a bearing problem-there are some nasty noises coming from my '98 engine.

I like the '99 because it's SOHC which'll make it cheaper for me when I upgrade the cams later on.

I'll be putting a turbo on the engine as soon as I can get one.

Have a great weekend! John
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Old 03-13-2001, 08:18 AM   #18
Rovah
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PM'd Shiv, althought I haven't heard back-he's probably having fun in the dirt with his project RS! ;-)

Anyone else have any information about how the fuel delivery system is the same or diffrerent on the '98 DOHC and the 99 SOHC?

If not, any ideas who I can ask?

Thanks! John
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Old 04-27-2001, 07:20 PM   #19
Rovah
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Guys, engine swap still hasn't happened yet.

Someone told me I should think about putting the '98 heads on the '99 block and put some low compression pistions in it since I'm going to put a turbo on it.

I still haven't found any info as to whether the '98 injectors would work on the '99 fuel rail. The rails and intake are definitely not interchangable.

Just throwing this out for some more discussions/suggestions!

Thanks! John
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Old 04-27-2001, 08:11 PM   #20
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the 99 rails won't work with the 98 injectors the 99 is a top feed and the earlier are galley.. just use the block only then you just have a 10:1 compresion 2.5 yes the boost tolerance will be less but you will just have to live with that or you could get a ej22t like i did just the short block and bolt all the 98 stuff to it since you already bought the turbo kit. hopefully my hybrid will be done next month. tell you what the 22t is one hell of a strong block you can see that by just looking at it as a friend said "thats too much aluminum for 300hp"
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Old 04-28-2001, 05:10 AM   #21
Rovah
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Bill,
I didn't know you were doing a hybrid. I didn't think the intake from the '98 would fit onto the '99, but I'm putting it on if it does. I'm going to install low compression pistons, so the compression shouldn't be an issue....

I can't wait to hear how your hybrid is going. Obviously, that's my other option at this point. Not sure what the real benefit would be to go that route though...

Thanks for the reply and info! John
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Old 04-28-2001, 07:21 AM   #22
bill harvey
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rovah go to the nesic forum i will pull up picks of the ej22t blco and the open deck 2.5
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Old 04-28-2001, 08:13 AM   #23
bill harvey
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if you use your dohc heads then its the 98 manifold going to the 98 heads so just use the short block.. the benefit of using the 2.2t is that they did all the work for you has the oil squiters for the pistons and all just wait till you find out how much the rebuild is for the 2.5 it will be as much as i paid for my brand new ej22t

[This message has been edited by bill harvey (edited April 28, 2001).]
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Old 04-28-2001, 02:29 PM   #24
Rovah
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Bill, sounds like I may end up doing what you're doing. It all depends on how much the EJ22t short block is.....

Thanks again for all the info! John
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