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Old 01-27-2019, 11:48 PM   #1
Zachs02wrx
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Member#: 497003
Join Date: Jan 2019
Default JDM EJ205 Swap Issue

Ill try to make this short and sweet. Hopefully somebody out there can give me a good idea as to if i need a tune or if i have a drive ability issue.

STORY:
bought an 02 wrx with a popped engine for a steal of a deal

picked out my JDM EJ205 to swap and ordered one of these http://www.jdmflorida.com/index.php?...&product_id=79

I swapped everything
- intake manifold
- cam/crank gears
- cam/crank sensors
- knock sensor
- oil cooler, coolant crossover, intercooler brackets... etc (this part goes on and not important for driveability)

I got the engine in and the car started up and all went just fine until I began to get into boost. around 3,000RPM and 5-7PSI of boost, i get major hesitation until the engine feels to "catch" itself and then it builds up to 15PSI and pulls hard and fast.

I cannot figure out why i am having such issues with hesitation and cutting out.

I am worried that maybe this engine has a different compression ratio and i am leaning out? Any help would be great... im really at a loss of what this could be
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Old 01-28-2019, 12:24 AM   #2
MortonCharbo
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Member#: 487057
Join Date: Jun 2018
Chapter/Region: BAIC
Location: California
Vehicle:
2002 WRX Wagon
PSM

Default

What ECU/tune/wiring harness are you using?
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Old 01-28-2019, 12:27 AM   #3
Zachs02wrx
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Member#: 497003
Join Date: Jan 2019
Default

Quote:
Originally Posted by MortonCharbo View Post
What ECU/tune/wiring harness are you using?
Whole setup is as it came from the factory. minus the JDM longblock
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Old 01-28-2019, 09:23 PM   #4
Zachs02wrx
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Member#: 497003
Join Date: Jan 2019
Default

UPDATE TO PROBLEM
I replaced the spark plugs, and went ahead and replaced my MAF just because it looked very unhealthy
to no avail did this fix the issue

The car will pull just fine in first gear
the rest of the gears around 3-4k rpm under boost feels like i am hitting a wall

I think tomorrow i will replace my ignition coils to see if this is the issue.

any help would be appreciated.
thanks!
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Old 01-28-2019, 09:39 PM   #5
Hondaslayer
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Member#: 4562
Join Date: Feb 2001
Chapter/Region: NWIC
Location: Auburn, WA
Vehicle:
2014 Electric Datsun
2005 Adventure van

Default

Stop throwing parts at it. Step back and start with the basics.


Fuel, air, spark and time.

Check compression.

Verify that all vacuum lines are hooked up, in the right places, and any needed restrictors are in place.
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Old 01-29-2019, 10:50 PM   #6
Zachs02wrx
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Member#: 497003
Join Date: Jan 2019
Default

Quote:
Originally Posted by Hondaslayer View Post
Stop throwing parts at it. Step back and start with the basics.


Fuel, air, spark and time.

Check compression.

Verify that all vacuum lines are hooked up, in the right places, and any needed restrictors are in place.
Oh i just happened to have a MAF laying around (i can't afford to throw parts at a subaru . My ignition timing is good (10-12 btdc idle rises to 36-40 drops back down). No knock correction, good linear advance on RPM. vaccuum is good. 20 in/hg at idle and i do have the restrictor pill in place. the engine is a jdm import with "good" compression from dealer (i haven't verified so i guess it certainly wouldn't hurt).

After data streaming the ECM:
o2 sensors are reading as they should.
ECT is functioning at proper engine temperature
MAF is reading proper grams/s 4 ish at idle and raises with a linear band on increase of load.
no knock correction
everything looks fine to my eye?

I often times have trouble replicating this problem.

After a long drive cycle, it barely cuts/hesitates/"hits wall"
But in the mornings, right when it is at operating temperature and i begin to get into power band, it hits that wall hard.

Maybe i'm having wastegate troubles?
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