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ECU vs block

 

Hi there,
Last fall we took possession of an 85 bus but it was late in the year and we barely drove it, or even got familiar with it. So now I’m poking around because I want to buy an oil filter, and:
The ECU s/n indicates an ‘03 WRX, 2.5, but I’m seeing EJ20 on the block. Is this a usual arrangement?
I know there are many variables; I’m just starting down the path of deciphering what I’ve got here. (Can an EJ20 be bored out to make it a 2.5? Might the ECU have been reflashed to suit an EJ20? Does it matter very little? &tc….)
Tx,
Jim
 

WRX's of those years (till 2005??) where EJ20(5?)'s, the STIs of 2004 on where of the EJ257
?
Also i believe there is only one filter fro all EJ motors to the most part (Naturally aspirated or Turbo-charged)
?
So you have a turbo motor in your Van?
 

I do not have a turbo. When I looked up the ECU number it indicated it's for a 2.5 but I may have misquoted the year in my original post.?
(I got the filter sorted; I've ordered a Baldwin B1400 which crosses to the 15208AA100 Subaru number.)


On Wed, Apr 2, 2025, 11:59 p.m. Kevin via <91XR7=outlook.com@groups.io> wrote:
WRX's of those years (till 2005??) where EJ20(5?)'s, the STIs of 2004 on where of the EJ257
?
Also i believe there is only one filter fro all EJ motors to the most part (Naturally aspirated or Turbo-charged)
?
So you have a turbo motor in your Van?
 

Maybe? non-turbo ECU and intake for the 2003 2.5, with a swapped JDM 2.0 short/long block?
 

I want to get in touch with the guy who did the conversion to discuss; hopefully he can shed some light on it if he remembers or kept records but we don’t speak each other’s language so it needs to be when I have a bilingual person handy.?
I expect to cross paths in June but meanwhile, how different might a 2.5 and a 2.0 ECU be?
Like would it be “works not too bad, let’s roll with it” or more like “not a chance, this ECU must be reprogrammed”?
To


On Thu, Apr 3, 2025 at 9:53?AM Wayne Sitarz via <wesitarz=gmail.com@groups.io> wrote:
Maybe? non-turbo ECU and intake for the 2003 2.5, with a swapped JDM 2.0 short/long block?
 

What's wrong with it? Codes?
 

It's running really well. It's more that I want to know what I'm dealing with in case something happens.?


On Thu, Apr 3, 2025, 10:38 p.m. Wayne Sitarz via <wesitarz=gmail.com@groups.io> wrote:
What's wrong with it? Codes?
 

If no codes, I would roll with it.
--
Warren
89 Westy?
88 Tintop
70 Westy
 

What would the PN be on the ECU itself (22611-xxxxx kind of number)
?
Also what market are you in? different markets have different ways of doing thing. Plus i've seen Subaru ECUs listed for both the 2.0 and 2.5L (mostly non-north American markets)?
?
And i'm with Wayne, someone may of used a EJ20 JDM long block as a replacement since they usually are pretty cheap (and low mileage).? the ECU may not be fully happy (at the edge of adaptation limits) but will work either way
?
?
 

It's 22611-AJ020...
Does that last part imply it is indeed intended for an EJ20?
The original vehicle serial number is written on by hand; it is JF1GD67583H503164 and then also written there is 2003 Imp. RS.25 Aut.
When I look that up on line it says it's a 2.5.
I'm in Canada.?

On Thu, Apr 3, 2025, 11:50 p.m. Kevin via <91XR7=outlook.com@groups.io> wrote:
What would the PN be on the ECU itself (22611-xxxxx kind of number)
?
Also what market are you in? different markets have different ways of doing thing. Plus i've seen Subaru ECUs listed for both the 2.0 and 2.5L (mostly non-north American markets)?
?
And i'm with Wayne, someone may of used a EJ20 JDM long block as a replacement since they usually are pretty cheap (and low mileage).? the ECU may not be fully happy (at the edge of adaptation limits) but will work either way
?
?
 

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I did a lookup on your vin and your ecu number.
Here’s the info that came back…..

This part fits
2003 Subaru Impreza or Impreza WRX?(VIN:?JF1GD67583H503164)S - SEDAN; 251 - 4 Cyl 2.5L SOHC EMPI NA; 4W - FULLTIME 4WD; AT - AUTOMATIC TR

Here’s the site that I found the information on:

Best,
Brent

On Apr 4, 2025, at 7:42?AM, wallaces_21 via groups.io <grandfatherjim@...> wrote:

It's 22611-AJ020...
Does that last part imply it is indeed intended for an EJ20?
The original vehicle serial number is written on by hand; it is JF1GD67583H503164 and then also written there is 2003 Imp. RS.25 Aut.
When I look that up on line it says it's a 2.5.
I'm in Canada.?

On Thu, Apr 3, 2025, 11:50 p.m. Kevin via groups.io <91XR7@...> wrote:
What would the PN be on the ECU itself (22611-xxxxx kind of number)
? Also what market are you in? different markets have different ways of doing thing. Plus i've seen Subaru ECUs listed for both the 2.0 and 2.5L (mostly non-north American markets)?
? And i'm with Wayne, someone may of used a EJ20 JDM long block as a replacement since they usually are pretty cheap (and low mileage).? the ECU may not be fully happy (at the edge of adaptation limits) but will work either way
? ?

 

I think you have a 2003 2.5 NA ECU,harness and intake manifold with a swapped 2.0 (JDM?) block if it is stamped EJ20 on the block. Both the 2.5 and 2.0 ECUs look to be 4 connector and interchangeable. If you are looking to get engine parts in the future, the intake and up parts and sensors would be for the 2.5 NA.? I wonder what plugs and gap it's running. Only the 2.0 Turbo was WRX.

 

What water pump do you have?? The 2.5 has a single heater return fitting. The OE 2003 2.0 turbo has 3 fittings.

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