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Old 07-12-2013, 12:26 PM   #1
Suby2.5i
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2007 Impreza 2.5i-T
SGM

Question My turbo 2007 2.5i wont add fuel in boost

Car is a 2007 impreza 2.5i. Alright guys i turboed it like 2 years ago on 4 psi with just wrx injectors and stock pump on a td04. Decided to go all out and did a fully built bottom end with some headwork. Threw on a td06 20G and bumped it to 8 psi. But this time i have
DW301 pump
1,000cc DW injectors
A return line to tank with RRFPR
Aeromotive rails.
It goes lean in boost. One option i think the shop missed over the OEM fuel pressure regulator in the tank that only lets 43psi. Because then the RRFPR wouldnt be able to anything with a constant 43psi. (Going to check this weekend)
Also the tuner said even with my 4 bar map sensor the stock ecu can only read up to a max of 12 psi. (Originally had the 20G set to 19psi) is this true? Car is 2007 impreza 2.5i
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Old 07-14-2013, 11:40 AM   #2
Suby2.5i
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So i just took out the hanger. The shop alread removed the stock regulator. I dont even know where to start now. Maybe the injectors are to big for the ecu?
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Old 07-15-2013, 02:06 PM   #3
geronimo81
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9psi on 91 No EM

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Not a tuner here but can the ecu really be the problem? Wouldn't it be the actual sensors that are the limiting factor?

Which shop is doing the tuning and what are they using? (I assume opensource)
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Old 07-15-2013, 06:44 PM   #4
Suby2.5i
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Dont want to use shops name. But yes opensource
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Old 07-21-2013, 10:53 AM   #5
olsen726
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2.5i???

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so do you have the 4bar, or stock? because the stock map only reads up to 8ish psi i think( i dont remember the exact number, but its around 8 or 9 i believe)

edit: nvm, i just reread the post, and you do have the 4bar
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Old 08-08-2013, 09:32 AM   #6
Suby2.5i
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Olsen what map sensor are you using? It seems everyones turbo 2.5i's worked out fine but mine. And what maf sensor? Whats your boost set to and are you on oem ecu still? I have a feeling they screwed up my sensor scalings
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Old 08-08-2013, 01:34 PM   #7
banshee04
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Built Motor/6766/E85

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You need a boost referenced FPR. Either get one from a STi/WRX or get a AFPR.
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Old 08-08-2013, 02:01 PM   #8
Suby2.5i
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I have a aeromotive rrfpr with a fuel return
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Old 08-08-2013, 02:19 PM   #9
banshee04
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Whats your base pressure at?

Do you have a good boost/vacuum reference?

Could also be a tuning issue aswell? You dont have access to the map do you?
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Old 09-05-2013, 12:23 PM   #10
Suby2.5i
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Turned out it was a few load limiting tables in the ecu that romraider never unlocked. Tuned it with ecutek on 10psi.
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Old 09-07-2013, 12:54 PM   #11
VIsubi
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it could have been someof the hacks you must unlock in OS..I'm on stock rails with 255l and 550cc on 9 psi of boost no issues... with no fueling issues after fuel hack. before it was a nightmare..also in tank fuel filter and sock can restrict a lot of needed fuel. Glad it worked out none the less. I have an 06 sti FPR if you want it never used just need to pay for shipping..also how did you return fuel to tank if hanger cover has one fueland one breather lol
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