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Old 10-02-2007, 10:37 AM   #1
ted dibiase
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wrb

Default does anyone else have problems with their hybrid?

About a year ago my 2.0 liter blew up, so I swapped in a 2.5 liter short block and mated it to my 2.0 liter heads. It has never really run right. I get boost creep, it doesn't idle right, it feels jerky and/or shaky. I feel like I need an EWG to fix the creep problem, but I also feel like part of my problems could be in trying to mate that head to that block. I'm looking for a simple fix to a complex problem I guess. Has anyone else had these types of problems? How did you fix it or did you? Would it make sense to get and STi head, or would cams work just as well? I would like to have good factory like power. I'm not interested in making 800 hp, I just want my car to run right and to have enough power. What all would be required to make it more like a factory tuned/engineered EJ257? Obviously the head, but what else? How are people controlling AVCS? Is it time for me to just get full stand alone EM? This is so ****ing frustrating... I wish I would have just rebuilt my 2 liter.
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Old 10-04-2007, 01:41 AM   #2
Sko
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Stock ecu? Sounds like it just needs a reflash.
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Old 10-04-2007, 02:17 AM   #3
STiBottom
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Don't get discouraged. I have had some problems with mine with the random leaks and constant monitoring of the whole system but it is worth it. What you might try doing is going somewhere that is known to be great at tuning subarus and see if they can smooth things out for you. Also you might want to check your suspension for the "shakes" could be the clutch though. I don't know without a more accurate explanation. The heads on the wrx are really limited by the cams however they do improve the spooling time of some turbos over the STi cams. I see full boost on my VF-39 a little earlier than a stage II STi. If done right then the hybrid can be really fun and it can teach you a lot about cars in general.
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Old 10-04-2007, 10:07 AM   #4
oneoverWRX
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yes a hybrid can be very fun. The only problems i have had so far have been traction related.

get a tune and see what happens.
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Old 10-04-2007, 10:22 AM   #5
ted dibiase
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I have been tuned numerous times with my AP. I was over-boosting so I ported the 16g and it helped a little. I recently purchased some STi heads, but I'm not sure if that will fix the problems.
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Old 10-04-2007, 11:55 AM   #6
Jeremy@Cobb
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So with a 2.5L you are adding a .5L of displacement, which means it is a bigger engine, which means you have more exhaust gas energy.
Did you or your tuner change out the boost pill size to a larger pill? This will allow the wastegate to open a little sooner and lessen or get rid of your boost creep issue.

- J.
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Old 10-04-2007, 02:26 PM   #7
ted dibiase
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Good info Jeremy. I know the tuner didn't change the boost pill size, but I'm using a GM boost solenoid. Does the pill size still have any bearing?
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Old 10-04-2007, 02:39 PM   #8
cm1wrx
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The pill should be removed when using the GM boost solenoid. You should have run all new vacume line when installing it. New line= No Pill.
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Old 10-04-2007, 04:53 PM   #9
ted dibiase
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That is what I thought.
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Old 10-07-2007, 08:21 PM   #10
JMK508
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Its like a STI.....
but it doesn't break

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Who is tuning your car. THey should know little things like taking the pill out when going with the GM.
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