Yeah you can put ej22 block and ej205 heads together, but the ecu wont work with the ej205 heads.

 

Okay so at least I have half the battle, the block and heads are compatible thats a bonus

Alright so then Im going to have to source a wrx computer and harness then correct? If I remember correctly, the stock gauge cluster wont plug up to the wrx harness, which means wrx cluster and dash etc. Thankfully I came across some of that already in the past, THANK YOU LIFELESSVIET!!

Any other info that would be good to have in this build? Im kinda treading new waters at this point I havent worked with factory boosted components yet. I can imagine Im not going to be looking for a wrx intake manifold, but I can deal with that.

 

While I would recommend using the WRX ECU for the tuning aspect of boosting it later, you CAN run the WRX heads with the 222. In fact, the WRX and 222 have the same timing marks. The problem is the '01 RS doesn't, it uses a much older setup, so regardless of what heads you were going to use, the block and manifold wouldn't play nice with the RS ECU.

Assuming you have the 222's manifold and TB, you have everything you need to play nice with an '02-'05 WRX ECU except the O2 sensor. I compiled a lot of info on it when I swapped my RS to a WRX ECU.

 

Okay so after doing some looking I also have the engine harness that came in the parts lot with the heads. Also included a pair of intercoolers and other tidbits. I should have the body harness that was pulled from our budgets project. Primarily have to source the wrx ecu and the gauge cluster which I may have at my friends place. Already have a turbo, up pipe and intercooler from an 06 wrx as well as the exhaust manifold from lifelessviet. Kinda piece-mealing this thing together haha

Yes I do have the 222 manifold, its still a complete 222 motor. Would it work better with the 222 mani or the wrx mani?

 

The WRX manifold is 3 separate pieces. There's the actual intake manifold that the TB bolts up to, but then there are two TGV housings that bolt to the engine block, and the manifold bolts to those.

Even if the 222 manifold is a smaller diameter, it would be more efficient than the TGV's... Though you can buy TGV deletes. Such a pain.

Then, there's the question of top feeds vs side feeds. Knowing nothing about the 222... I don't know what to tell you.

 

@Sarra defintely a good point I didnt think about the tgvs, I was only thinking about clearances and space in the engine bay. Even with the 222 I was looking into phenolic spacers. I know that the wrx mani has a more snub-nose kinda design where the tb bolts up whereas the 22 mani goes a little further back.

As far as the injectors go, thats where I was most concerned with the manifold choice. Seeing as how I have the wrx engine harness, itll most definitely fit with the wrx heads and not have to worry about merging for different sensors. I did that with a 22e-to-222 swap. Aaaand forgot to change the cam gear so the timing mark didnt line up..... but thats a different story for another day :wtf:

I think I will keep a lookout for the wrx intake manifold so I dont have to mess with injector wiring, keep everything as it should be and only change the block. Just means Ill be looking for tgv deletes in the process. Maybe I can hit up Lifelessviet for one more favor if he ever checks his facebook messages.

 

If you use the ej205 heads, you will need to do a full wrx swap. ecu, merged harness, engine harness, intake manifold, Throttlle body, exhaust, turbo, Intercooler.. All of it. Think of it as doing a wrx swap and you have a longblock already.

I also recomend using a wrx 10mm oil pump rather than the NA 9mm oil pump, just to be safe.

That block works well with ej205 heads. the compression ratio ends up around 9.1:1 thats tbout the same as JDM wrx''s. I have that same block head combo in a car right now, it feels really good up and can handle anything a stock ej205 block can handle.

 

In theory the 222 ECU will run on those heads. Whether or not it will run well is a different question... But the triggers are the same, so it will fire injectors and spark plugs at the correct time.

 

Headgaskets match the block, so the 2.2's HGs are the ones you want.

I mean yeah, if you have all the electrical stuff, may as well use it!

 

be sure to get a ej205 timing belt tensioner bracket. it has an extra hole for a T-belt idler that the SOHC 2.2L does not have. (Oakos has new ones if you can't get a used one).

Get the full Gates Timing belt kit with water pump and idlers.

The 2.2L shortblock does not have a oil cooler on it, the wrx water pump has a hose outlet that goes to a wrx oil cooler. You will either need to plug it, use a 2.5i non-turbo water pump, or find a oil cooler and everything required to install it (do NOT use one from a engine that spun a bearing).

use a wrx oil pan, different baffling than a NA 2.2 (they are around $40-50 on rock auto and the fitment sucks, but they work. No gasket needed, just a generous amount of silicone).

not sure on the oil pick-up tube compatibility, so we got a Killer B pickup tube, it wasn't much more than a new OEM tube.

If your 2.2L does not have a Timing belt crank gear Guide, I recomend getting one. (Oakos has these as well).


after letting the engine run for about 20 minutes. I change the oil & filter right away to get rid of any debris that was left in the engien from assembly.

 

Absolutely every bit of that is extremely helpful thank you! I may end up printing all that for quidelines when I get to start the build :lol: