I have been looking into upgrading my injectors in the near future. I was just wondering which size would work the best for my application. My mods include: tanabe 3" downpipe, tanabe 3" cat delete, DC Sports catback, Apex'i AVC-R boost controller, AEM intake w/k&N filter, 255lph fuel pump, turbo xs bov w/recirculating kit, injen i/c piping. I plan on oredering HKS272/272 cams shortly. I was just wondering if anyone had any suggestions in what size I should buy?? 440cc, 525cc, 560cc, 650cc, 660cc, 750cc, 880cc, etc...thanks for your help in advance

oh, and I plan on getting a full custom tune too.

 

Stock one's are rated 560's.

If your running straight pump 93.
They should still be fine around 350whp. Then you might be maxing out your injector duty cycle.
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stock injectors are fine for your plans, no need to upgrade injectors yet.

 

IMO, even if you were to further free up back pressure via O2 housing upgrade, ported stock manf. and 10.5 hotside, in addition to your 272's, you would still have a bit of headroom left with the stock nozzles. Even on Race gas you might still be o.k. as a race gas tune would leanout your fuel map. So, probably no need for injectors at this stage.

Of course if you lived in Southern California then a set of 720's would go hand in hand with the 272's and an SAFC II instead of a flash.

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thanks for your help. sorry if it's a dumb question, but I'm kinda new to evos and didn't really know what the factory ones were rated and how much power they could handle. thanks again for your help...

 

660CC or 720cc Denso.

 

i agree.