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Old 04-27-2017, 08:19 PM   #1
pcampbell
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Join Date: Jan 2016
Default EcuFlash/RomRaider help with bigger injectors - no other changes (for now)

I'm going from 245cc to 420cc injectors in prep for supercharger. But I will be driving around for a while on the 420cc's before the supercharger is hooked up which will be "PRO TUNED".

I understand I need to change the injector latency and injector scaling.

What else needs to get changed. I understand there's pulse widths for cranking and tip in enrichment. What exactly do I need to do for these?

Do I just make the injector pulse .583x shorter than what is there currently, since the injectors are bigger by this factor? (420 * .583 = 245).


Is that correct - if so, anything else?
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Old 05-15-2017, 10:23 PM   #2
CarmelValleyWRX
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2005 wrx wagon
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i upgraded my wrx injectors from 420cc (02-05 wrx) to 550cc. i used the stock latency and scaling from the car i took the injectors from (newer wrx 06-07). then i shortened the cranking pulse width and tip in enrichment pulse width by the ratio of the new injector scaling to stock scaling. starts easy. tip in was never perfect stock so it is still crap and needs tuning i noticed small changes to the tip in make it drive really bad so went back to my stock setting rescaled for the injectors. i hope to fine tune it but need to fix other things first.


a thing to note is, my bigger injectors were supposed to be 565cc or something, but in the 07 wrx rom, the scaling was 550cc. so i used the scaling and latency from the stock rom, instead of the reported 565cc people say they flow. my AF corrections are within 1% so i think it worked out pretty well that way. so maybe try just taking the values from, say, a 2004 wrx with the 420cc light blue injectors.

Last edited by CarmelValleyWRX; 05-15-2017 at 10:28 PM.
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Old 05-16-2017, 11:39 AM   #3
fenix-silver
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Chapter/Region: MAIC
Location: Central PA
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2004 WRX Wagon
WRB

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There is also a CL/OL transition with injector pulsewidth table that should be adjusted. Before I had adjusted that for my dark blue 550s, during part-throttle cruising, the car would jump back and forth between CL and OL, which caused a weird surging behavior.
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Old 05-17-2017, 09:59 PM   #4
CarmelValleyWRX
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are your CL OL transition zeroed? mine are zeroed out and no problems never changed anything there as far as injector pulse.
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Old 05-18-2017, 08:21 PM   #5
fenix-silver
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No, my tuner set them to 10 across the board.
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