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Old 03-31-2013, 12:34 PM   #1
JackWasHere
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Default New short block, stock tune running weird

Hey all,


I'd like to begin and say, yes, I've looked at the stickies, and I've done about an hours worth if research on this topic and learned a few things.

Here's my situation. I just purchased a 2005 wrx wagon with a knocking rod. Got the short block replaced, and received the car back last night. The car has a few mods on it right now (I have a few more parts going on after smog) like a Perrin turbo inlet, Apexi cat back, and a set of headers and up pipe from a hawk eye.

When I picked up the car last night, my tech told me that when he was breaking in the engine, the power would sort of flat line after around 4500rpm in second, third, and fourth gear. Although first gear pulled all the way to red line. He tested for a boost leak and all is well there, and he explained he thinks it's the tune on the car. (Currently on a stock tune for smog) I have a Cobb AP V1 at my house, and he suggested I data log some driving, and then send him the log.

Just wondering what you guys think about this. I've read on here of a few cases where mods on a stock tune could actually yield some power loss because the ECU gets all catty whompus. I'd really appreciate any input you have on this!
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Old 03-31-2013, 12:36 PM   #2
JackWasHere
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Let me clarify one thing. The mods on the car AS OF NOW, are the Perrin Turbo Inlet, Apexi cat back, and headers and up pipe from an 06 hawkeye. The mods I will be putting on after smog are a set of UEL headers and catless up pipe, and an nvidia down pipe.
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Old 03-31-2013, 05:01 PM   #3
JackWasHere
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Bumpppp
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Old 03-31-2013, 05:07 PM   #4
ProfessWRX
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Quote:
Originally Posted by JackWasHere View Post
Bumpppp
Get a tune or you'll be buying another shortblock.
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Old 04-01-2013, 05:11 AM   #5
JackWasHere
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Quote:
Originally Posted by ProfessWRX View Post

Get a tune or you'll be buying another shortblock.
Would a stage 1 Cobb tune suffice? Or a stage 2 tune after I put my up pipe and down pipe on?
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Old 04-01-2013, 05:21 AM   #6
Amazinman
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Quote:
Originally Posted by JackWasHere View Post
Would a stage 1 Cobb tune suffice? Or a stage 2 tune after I put my up pipe and down pipe on?
Please check the main crank pulley at the timing belt. The teeth vary for the crank sensor pick-up. If one tooth is different, the car will behave as it is now. Compare the 2 crank timing pulleys and confirm they match! If not, fit the old pulley and re-do the timing.

Good luck
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Old 04-04-2013, 05:14 AM   #7
Phatron
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you're in cali on 91oct, with a built motor, mods on the car without a tune.

the car is most likely pulling a crapload of timing.

also, with teh age of the car you most likely need a need 02 sensor.

we really need logs and data to diagnose anything.

but with R&R of a motor it could be a million different things from a leak to something like a coilpack isnt plugged in.
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