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jrnannery 05-12-2012 02:11 PM

Fuel Injector question
When your fuel injector opens, fuel pressure forces fuel out of the open end of the injector until the computer, based on hundreds of computer calculations from tables and supplied sensor data, closes the injector. Now, here's the question.

If you get a larger fuel injector (is it a larger diameter opening?), more fuel is allowed out of the injector each time the computer opens the injector. Is that correct?

The point of all this is, of course, hopping up the engine, so keep this in mind when answering.

SuperiorStyles 05-12-2012 04:36 PM

High flow injectors, by themselves, will not increase horsepower. When the airflow capability of an engine is increased significantly, additional fuel must complement the increase in airflow in order to support more horsepower. Thus, the proportional increase of air and fuel together will increase horsepower.
The factory fuel injection system operates slightly rich from the factory. Because of this, certain engine upgrades such as low restriction air intake/exhaust systems and/or slight increases in boost pressure can usually be taken care of by the factory fuel injection system. In most cases a naturally aspirated engine will have a B.S.F.C of .50. This means that the engine will use .50 lbs. of fuel per hour for each horsepower it produces. Turbocharged engines will want to be at .60 lbs. per hour or higher.

jrnannery 05-12-2012 10:46 PM

I know about fuel/air ratio. What I'm asking is, is the pulse width the same, just that the higher flow injector pushes more fuel during that pulse width? I also know that there are many variables that come into play.

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