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Old 12-25-2007, 07:19 PM   #1
Riles
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Member#: 121154
Join Date: Jul 2006
Chapter/Region: South East
Location: Knoxville, TN
Vehicle:
2002 Impreza WRX PSM
Stage 47, Romraided

Default Injector scaling help

I have an 02 wrx with a 16g/exhaust/intake. I just installed PE650 injectors and need a little help getting this to idle. I changed the latency to 3.69, 2.39, 1.88, 1.58, 0.68. The idle still sucks and the CEL is flashing. Should I now keep the latency the same and scale them back to 560 to 570 to get me in the neighborhood or what?
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Old 12-26-2007, 10:13 AM   #2
DocDetroit
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I had an '03 WRX with PE1818, TurboXS topmount, PE650s, Walbro, Perrin fuel rail, etc.

After I installed everything, it fired up, idled and drove in closed loop reasonably well without any tuning.

Are you sure you don't have some other mechanical problem (vacuum leak, etc)?
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Old 12-26-2007, 01:37 PM   #3
mickeyd2005
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ABP

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Don't just guess.

Datalog and make an educated estimate.

Your car should idle fine if you wait for AFR learning to set in as long as you are within 15% of your target.

First thing is to check your CEL and log roughness.

Then log AFR, AFR learning #1, AFR correction #1, IPW, MAF, rpm, load, CL/OL status.
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Old 12-28-2007, 01:02 AM   #4
Riles
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Stage 47, Romraided

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Thanks guys, I'll try some data logging
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Old 12-28-2007, 02:30 PM   #5
benw
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aspen white

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what intake did you install? you're gonna have a beast of a time scaling the maf and the new injectors simultaneously. can you reinstall the stock intake?
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Old 12-28-2007, 10:52 PM   #6
Riles
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Stage 47, Romraided

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its the spt intake and yeah its a toughy to scale but its doable
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Old 12-28-2007, 11:49 PM   #7
mickeyd2005
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If you scale the injectors and the intake simultaneously, your resultant maf and load will be slightly off. The AFR can be tuned such that it is correct. A small error is not that big a deal. My guess is anywhere between 1 and 10% depending upon how good you can guess.

It only becomes a problem when the load scale is really off like when you try to get around the 300 g/s of the 16 bit ecus by dividing everything by two.

The problem is that there are a LOT of ancillary tables that are MAF or load dependent. A lot of tuners forget to rescale the other tables.
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