Subaru WRX Forum

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-   Bolt-on Tech (EJ255/EJ257 2.5L '04-07 STi and '06-07 WRX) (http://www.wrxtuners.com/forums/f75/)
-   -   Should I or Should I NOT? (http://www.wrxtuners.com/forums/f75/should-i-should-i-not-21225/)

Jonpark 11-24-2007 10:40 AM

Should I or Should I NOT?
 
I have VF39 with stock injectors on my 07' wrx.
I'm pushing 291awhp/321awtq.
Should i upgrade my injectors or not?
### i think my stock injectors r running around 90% of duty cycle...

nagyhead 11-24-2007 11:04 AM

i would leave them in there 90% duty cycle is normal.

IH8PVMNT 11-24-2007 11:48 AM

I READ somewhere recently that the 07 wrx injectors are actually bigger than the sti ones....

Jonpark 11-24-2007 06:13 PM

how about to changing the fuel rail?
### when i'm WOT, i get check engine light.
only when i'm flooring down.
cylinder #1,3...
after i got the perrin EL header, it's happening less but still getting misfire.

awd4life 11-25-2007 02:50 AM

Yes, the 06-07 WRX has larger injectors than the comparable STi. I think it is only by a few CC's though. Not sure about that WOT CEL though.

sfelix818 12-18-2007 11:16 AM

Did you upgrade your fuel pump?

sfelix818 12-18-2007 11:17 AM

didnt notice this thread was dead


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