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Old 10-30-2012, 08:23 AM   #11
tunertype
Scooby Newbie
 
Member#: 335033
Join Date: Oct 2012
Chapter/Region: NESIC
Location: Holyoke, MA
Vehicle:
2009 wrx
Dark Gray Metallic

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If your never planning to upgrade the turbo you can just install a Fuel Pressure regulator to get alittle more performance out of the injectors you have. If you bump the pressure to 50psi. You'd end up with the equivalent of 605cc injectors which would give you the ability to flow enough fuel for an extra 25-30hp.

But if you plan on making more power later you'll need to get injectors anyways. The FPR will be easier to install and cheaper, but completely unnessesary if you just upgrade the injectors. (You can get a basic FPR for $25 off ebay, or a name brand nicer one for $175, injectors will cost closer to $80-175 ea(320-700).

If you do care about the reliability of your injectors you should try to run them at 80% duty cycle. Max hp for the VF39 should be around 375-400 crank hp(300-350WHP??? depending on the dyno) so you should get 750-800cc injectors for pump gas if you were upgrading. You could flow enough for that HP level with the 605cc + FPR upgrade with like 98% IDC.
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Last edited by tunertype; 10-30-2012 at 08:36 AM.
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