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Old 05-19-2013, 07:21 PM   #1
PhamilySedan
Scooby Specialist
 
Member#: 132249
Join Date: Nov 2006
Chapter/Region: MWSOC
Location: Omaha, NE
Vehicle:
2003 Bugeye PSM
RIP RSTi

Default 2003 WRX Beginner

I've owned many flavors of the EJ motor series but i've never touched them as far as tuning goes so excuse me if I don't explain the topic very well. Anyways, lets begin

So I am currently driving a 2003 WRX with the factory motor in it using 93oct fuel. Mods are as follows:

-VF39
-STi "pink" injectors
-07 STi Fuel Pump
-Catless TBE
-Catless Up-pipe
-AEM SRI (I know, but the car came with it)
** AEM UEGO waiting to be installed


I am having trouble getting started with evaluating the tune it has on it. I can't get any information from the previous owner as far as how he tuned the car. The drives "ok" but it needs some major refinement. Here are the symptoms i'm having.

-Idle is consistant and there is no fluctuation.
-The car DOES NOT like boost. It tends to hesitate with heavy throttle.
-Low RPM Driving is fine. That's why I say drivablitly is "ok". I would say that with 30% throttle or more will once again cause the car to hesitate.
-car can sustain speeds just fine
-The throttle change between shifts will cause the car to hesitate unless I am easy on the throttle.
-The car DOES NOT like it when I revmatch. Seems as if I am getting too much Air as opposed to throttle and It takes a while for me to get a response. It is not smooth at all.


Here is what i've done so far to diagnose the problem.

I've checked compression, 150psi on all four cylinders. I was shocked to say the least!

Swapped coilpacks and changed out the spark plugs. So I am ruling out that the hesitation is due to those parts and cleaned the MAF sensor.

I am leaning towards a clogged injector or my tune. Is there anything I can do to help me diagnose my issue via data logging the ECU or anything else you think I should be checking? (if you need to see a log, just let me know what parameters I should be using and I can get one ASAP)
The main parameters I am using now are,

*engine load
*engine speed
*ignition total timing
*IAT
*Knock Sum
*fine learning knock correction
*feedback knock correction
*ignition advance mult
*mass airflow
*final fueling base
*primary wategate duty cycle
*target boost
*throttle opening angle

Any input would be greatly appreciated.

Thanks guys!
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Old 05-19-2013, 08:16 PM   #2
ProfessWRX
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Join Date: Jun 2012
Vehicle:
06 WRX

Default

Log all that, pay attention first to knock and dam/iam.
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Old 05-19-2013, 08:20 PM   #3
PhamilySedan
Scooby Specialist
 
Member#: 132249
Join Date: Nov 2006
Chapter/Region: MWSOC
Location: Omaha, NE
Vehicle:
2003 Bugeye PSM
RIP RSTi

Default

I hate to ask without looking first, but what exactly am I watching for? All these numbers look the same to me. What are my objectives? Understanding of course that I might be told to search for my answer!

Thank you sir!
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Old 05-19-2013, 09:31 PM   #4
dux10
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Member#: 235338
Join Date: Jan 2010
Chapter/Region: South East
Location: Georgia
Vehicle:
2002 Faggin Wagon
srp

Default

Feedback Knock Correction (FBKC)
Fine Learning Knick Correction (FLKC)

Both will be in negative values if knock occurs. An occasional knock here and there are ok, but definitely not desirable. IAM should stay at 16. Any less than that means there's been enough recorded knock that it needs to remove timing pretty much everywhere.

It seems like its mostly drivability issues so I'm gonna say your injector/maf scaling is poor. On top of that, I would also guess to say your timing map isn't the smoothest and may also be playing into the frenzy.

I don't want to be the guy scaring you, but it's possible your playing with fire if the car is not appropriately scaled/tuned especially with your mods...

Steve @ Pullz-On Tuning
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