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Old 01-17-2018, 04:43 PM   #1
blueicevirus
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Default access port for an impreza

i have already looked around, contacted cobb etc. cant find direct answers even from cobb. i have a standard impreza and looking to do upgrades eventually another swap, so I want to start with the access port, cob states there is only one for the wrx or sti. meaning i need the correct ecu. when I loook up the part numbers for the wrx version of my car, it has the same part number for the ecu. please direct answers not opinions. thanks in advance
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Old 01-17-2018, 04:59 PM   #2
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A standard Impreza what? 2.2L? 2.5L? FB? What engine do you plan to swap into it? Where did you see that the ECUs were the same?
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Old 01-17-2018, 05:10 PM   #3
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2006 Impreza 2.5, in the long run a 257, but until then using this turbo set i have sitting around.
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Old 01-17-2018, 05:13 PM   #4
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Cobb does not support NA cars. (Been there, tried that) I don't know if you can use an AP on a standard Impreza with a bolt-on turbo.

If you eventually swap to an EJ257, I would imagine you can use the AP that's meant to be paired with the specific ECU that your engine comes with.
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Old 01-17-2018, 05:18 PM   #5
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If you're planning on running a turbo kit on your 2006 2.5 then it would probably be easier to go with a stand alone AEM than trying to work an AP in there.

What are you planning to do to the drivetrain so the trans/difs/clutch (manual?) can handle increased power.
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Old 01-17-2018, 05:20 PM   #6
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I understand that, so thats why Im trying to clearify the difference with the ecu. there isnt much major difference in the wrx from the base other than the stock tubo setup and forged internals. so, knowing that I need a wrx ecu, how do i know what im looking for when the part numbers are the same?
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Old 01-17-2018, 05:29 PM   #7
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update:

The 2006 STI uses part number 22611AL370
The 2006 WRX uses part number 22611AL352
The 2006 Impreza base uses part number 22611AM442

finally got some useful info from cob. these are factory part numbers for ecu.
I must have been pulling up the generic part number before.
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Old 01-17-2018, 05:33 PM   #8
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Quote:
Originally Posted by blueicevirus View Post
I understand that, so thats why Im trying to clearify the difference with the ecu. there isnt much major difference in the wrx from the base other than the stock tubo setup and forged internals. so, knowing that I need a wrx ecu, how do i know what im looking for when the part numbers are the same?
There Are insanely big differences besides forged internals (which the 257 never had in stock form, so unless your are referencing a built motor this is wrong) and a turbo.

Honest question. How much have you looked into this prior to this thread?
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Old 01-17-2018, 05:36 PM   #9
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yes, not my first rodeo. first with a subi though.
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Old 01-18-2018, 09:37 AM   #10
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Contrary to popular belief, and even Cobb themselves, Cobb did actually make an NA Accessport back in the day for specifically the 2006-2007 models. Sales were super low, so they only made them for those years. They only make them for the WRX from 2008 and later.

However, you can not buy the NA Accessports new anymore. Good luck finding one used as they didn't produce or sell many of them at all. They typically run about the same as a normal accessport in terms of price if you can find one.

Extra tip: If you are going with a an EJ257 down the road, just go for a WRX or STI. It's completely not worth it to do the swap on a 2006 2.5i and still have a base 2.5i in every other aspect. It would take thousands and thousands to fully convert it over.
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Old 01-18-2018, 10:01 AM   #11
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Quote:
Originally Posted by cmiovino View Post
Extra tip: If you are going with a an EJ257 down the road, just go for a WRX or STI. It's completely not worth it to do the swap on a 2006 2.5i and still have a base 2.5i in every other aspect. It would take thousands and thousands to fully convert it over.
This is likely the best piece of advice in here so far.
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Old 01-18-2018, 10:25 AM   #12
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Some friendly advice from someone who's been around since before the WRX came to the US. With the higher compression ratio of the N/A and noticeable increase in power by turning up the boost, I can say that every single n/a subaru I've seen with a turbo (2.2 and 2.5) has blown up. If you want to boost a N/A, a supercharger is the way to go. If you have a turbo "just laying around", then you'd want to limit boost to under 5 pounds.
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Old 01-18-2018, 11:22 AM   #13
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Quote:
Originally Posted by blueicevirus View Post
2006 Impreza 2.5, in the long run a 257, but until then using this turbo set i have sitting around.
The long run for this project is swapping to an EJ257? How boring. Why are you doing this and what is your goal?

This is not an opinion--you're better off buying an STI if all you want is an STI.
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Old 01-18-2018, 06:08 PM   #14
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Quote:
Originally Posted by Jack View Post
Some friendly advice from someone who's been around since before the WRX came to the US. With the higher compression ratio of the N/A and noticeable increase in power by turning up the boost, I can say that every single n/a subaru I've seen with a turbo (2.2 and 2.5) has blown up. If you want to boost a N/A, a supercharger is the way to go. If you have a turbo "just laying around", then you'd want to limit boost to under 5 pounds.
This. All day this.

Out of every single build I have seen so far, the SC builds last the longest, even with higher PSI. On a SC build it looks like 8 PSI is the limit while a turbo is 5 on a good day. I'm assuming this is because of how the boost is delivered. Turbos will spool on an NA sooner than they will on a regular WRX or STI engine (even on a 2.2) and from what I understand this will cause a lot of detonation issues where the supercharger doesn't peak boost so low and just grows with RPMs so the detonation thing isn't as much of an issue.

If you want to boost an NA look at the m62/m90 builds or the SC12/14 builds.

For your specific question on APs, the 05+ NA ECUs can be tuned open source pretty reliably. My 07 is tuned and makes for a much more enjoyable driving experience with the DBW.
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Old 01-18-2018, 09:18 PM   #15
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Quote:
Originally Posted by cmiovino View Post
Contrary to popular belief, and even Cobb themselves, Cobb did actually make an NA Accessport back in the day for specifically the 2006-2007 models. Sales were super low, so they only made them for those years. They only make them for the WRX from 2008 and later.

However, you can not buy the NA Accessports new anymore. Good luck finding one used as they didn't produce or sell many of them at all. They typically run about the same as a normal accessport in terms of price if you can find one.

Extra tip: If you are going with a an EJ257 down the road, just go for a WRX or STI. It's completely not worth it to do the swap on a 2006 2.5i and still have a base 2.5i in every other aspect. It would take thousands and thousands to fully convert it over.
IIRC, Cobb had a NA AP from 1999 and up (maybe only a V1?), I know, it started after my 1998.
Yes, they didn't sell well so they got dropped.

Quote:
Originally Posted by Jack View Post
Some friendly advice from someone who's been around since before the WRX came to the US. With the higher compression ratio of the N/A and noticeable increase in power by turning up the boost, I can say that every single n/a subaru I've seen with a turbo (2.2 and 2.5) has blown up. If you want to boost a N/A, a supercharger is the way to go. If you have a turbo "just laying around", then you'd want to limit boost to under 5 pounds.
Yep, you've been here a little longer than I have, my 1st Subaru is my 98. Agreed, turbo NA's only lasted (assuming you just bolted on a kit, not changed pistons, etc.) if kept to 5-6PSI.
SC'd NA's could go higher.
I don't think the NA AP did much for a FI engine, most went open source or at least piggyback.

Quote:
Originally Posted by lpxltt View Post
This. All day this.

Out of every single build I have seen so far, the SC builds last the longest, even with higher PSI. On a SC build it looks like 8 PSI is the limit while a turbo is 5 on a good day. I'm assuming this is because of how the boost is delivered. Turbos will spool on an NA sooner than they will on a regular WRX or STI engine (even on a 2.2) and from what I understand this will cause a lot of detonation issues where the supercharger doesn't peak boost so low and just grows with RPMs so the detonation thing isn't as much of an issue.

If you want to boost an NA look at the m62/m90 builds or the SC12/14 builds.

For your specific question on APs, the 05+ NA ECUs can be tuned open source pretty reliably. My 07 is tuned and makes for a much more enjoyable driving experience with the DBW.
I believe most open source work with 99 and up ECU's, what they can tune for varies a bit as well as how hard/easy they are to work with.

I remember when COBB was talking about doing a Raptor or Ripp SC, they never did sell them.
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Old 01-19-2018, 09:52 AM   #16
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Quote:
Originally Posted by Charlie-III View Post
I believe most open source work with 99 and up ECU's, what they can tune for varies a bit as well as how hard/easy they are to work with.

I remember when COBB was talking about doing a Raptor or Ripp SC, they never did sell them.
I could be wrong because I'm not a tuner, BUT my understanding is that the 99-2004 ECUs can be flashed, but they have to be done on a bench and it's limited with how much you can actually do. Honest, these ECUs have such a wide tolerance they can handle boost without the tune, you just obviously don't get the most out of the engine. The 05+ ECUs can be done with a cable in the car with open source software.

I think the Cobb units for these years are actually piggyback devices. I've never seen one though, they are probably one of the rarest Subaru accessory out there.

Again, I could be wrong here.

Last edited by lpxltt; 01-19-2018 at 09:57 AM.
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Old 01-19-2018, 02:32 PM   #17
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It may have changed, but currently the accessport is available for every year STI and WRX 2002-2018
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Old 01-19-2018, 03:07 PM   #18
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Quote:
Originally Posted by Charlie-III View Post
IIRC, Cobb had a NA AP from 1999 and up (maybe only a V1?), I know, it started after my 1998.
Yes, they didn't sell well so they got dropped.
I met a guy that was a member on here a while back (think it was "bluestig"), had a 2008 2.5i and was actually protuned via AP. It gained very little over stock, at the peak and in the mid range. He had a few bolt on's as well. Cobb still sold the NA Impreza AP for $650.
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