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Old 02-25-2015, 07:43 PM   #1
413SilverWRX
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Member#: 391720
Join Date: May 2014
Chapter/Region: NESIC
Location: Springfield
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2003 WRX
PSM

Default Feeling a difference between cars/swap troubleshooting

Hey guys!

Last year I picked up an 03 WRX automatic. I loved the thing, but I got this for the GF. So much that I ended up trading my MR2 for an 02 wagon with a blown engine, but a good 04 engine on the side. This one was also automatic, but meh, I have a few standard cars for projects and this is going to be my daily anyways.

So I swapped in the 04 engine, didn't remove the harness or anything on it, just hooked everything up plugged it into the harness on the 02, and drove it.

In comparison to the 03 sedan that is bone stock, the wagon felt sluggish. I understand it's heavier, but it shouldn't have felt the way it did. I put a TBE, UEL header, up pipe, and bought an AP. I put the stage 2 tune on, and it still feels sluggish in comparison to the 03 stock sedan! I did notice on my datalogs I was hitting his 11psi of boost...I did my research on that and ordered an EBCS from Cobb. (still waiting on it)

I googled around, and the general consensus is there is no mechanical difference between the 02-03 and 04-05 engines, although the ECU tables change.

How accurate is this? Should I be looking for something in the swap as my initial problem? I double checked everything, compared it to the other car, and everything looks legit. The motor itself runs fine, no CELs, but I feel it's not where it should be.

Any input would help!
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Old 02-25-2015, 09:22 PM   #2
Rickyh
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Location: Metairie, Louisiana
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Did you check the compression?
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Old 02-26-2015, 10:01 AM   #3
413SilverWRX
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I have not done a compression test. That is a solid idea though.

Now to find my tester

Thank you!
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Old 02-26-2015, 10:29 AM   #4
GrimmSpeed
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Location: Minneapolis, MN
Vehicle:
2015 WRX, 2012 WRX,
2013 BRZ, 2006 STI

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Yeah, 11 psi is low. Get the BCS swapped in and see how it feels. If that doesn't fix the boost issue (and make the car feel as you think it should) you could start looking into pre-turbo exhaust leaks or intake leaks. I can't comment on the harness changes, but it sounds like it is working fine. As Rickyh suggested, doing a compression test is always good for peace of mind!

-Andy
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Old 02-26-2015, 03:14 PM   #5
Crazyced
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World Rally Blue

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Check the basics! You might either have a boost or exhaust leak, a bad turbo a loose/weak WGA, a malfunctioning boost solenoid, etc.

Do you have the pill in the turbo/WGA line?

1st thing I did on my car was a boost leak test. Sure enough, there was leaks.
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Old 02-27-2015, 02:34 PM   #6
413SilverWRX
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2003 WRX
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Just an update to let you guys know I've been reading and following up on what I can...

I have not been able to find my compression tester, I moved all my tools to my workshop a week ago and still have been sorting through everything.

EBCS is still processing according to COBB's website. I'm assuming they're on backorder.

The pill is still in the turbo/wg line. I have an exhaust leak, but it's behind the muffler, so I don't think that would really affect my issue. I know when I put the TBE on there was no shaft play in the turbo, but thats not to say within the past few weeks something could have went wrong.

One thing I did do that made a difference was I took the stock intake setup off, and put the K&N Typhoon I initially took off the engine before swapping in back on. Took it for a ride, lower gears I'm reaching almost 14psi and on the highway I hit it a few times and it almost tapped 16 psi. So that was an improvement. Car did feel all around better as well. I just don't understand how changing from stock to the K&N would make such a change. I know COBBs OTS maps run rich, and the intake probably helped lean it out a little. I used the same MAF as well.

I'm going to try a boost leakdown test in the meantime until my compression tester is located.

I want to thank everyone for taking their time and giving their input!

Edit: Just read through this mess. http://forums.nasioc.com/forums/show....php?t=2689512
I think removing the K&N I just put on would be a smart idea

Last edited by 413SilverWRX; 02-27-2015 at 05:22 PM.
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