What size fuel injector would I need?

Adam Schwartz

Asked by Feb 24, 2016 at 06:38 PM about the 2005 Ford F-150 XLT SuperCab 4WD

Question type: Car Customization

I put a volant cold air intake with a bbk
80mm throttlebody on my stock 05 f150
5.4l. Wondering aproximately what cc
injector I should install to properly adjust
the air/fuel ratio?

5 Answers


Adam, You've increased the air flow but remember you have a closed loop system with an oxygen sensor in the exhaust that will tell the computer to adjust the fuel flow (within limits) to achieve the correct a/f ratio over the driving range.

Adam Schwartz

Ah ok. So I may not need to change injectors? Would a dyno run while monitoring the ratio give me the right answers/specs to know if I need to?


Yes, you may not need to change the injectors as the computer would tell the injectors to open longer to achieve the correct a/f ratio under most normal driving conditions. If you have the ability to do a dyno run and monitor a/f ratio (or O2 sensor signal) that would be good to do. One area that may be problem would be high rpm & WOT where there may be a possibility the injectors can't deliver enough fuel considering the additional air flow you've added. This is a performance area where you want a rich a/f ratio because of high power demands and high load conditions. Do the dyno run if you can.

1 out of 1 people think this is helpful.
Adam Schwartz

Thanks! I'm going to call and schedule one


Adam, More info. I went to Autorama in Detroit at the end of Feb. and came across an injector supplier named AUS Injection, Inc. Check them out at www.ausinjection.com This info does not constitute an endorsement as I've never done business with them.

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