RC Engineering, Inc.   
20807 Higgins Court   
Torrance, CA  90501   
Phone     310-320-2277   
E-Mail: 
RC@rceng.com    
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Frequently Asked Questions


   How much horsepower will I gain from upgrading the injectors?
   When do I need to upgrade the injectors for my car?
   What size injector do I need for my car?
   Do I need high or low resistance injectors for my application?
   Can the factory injectors be modified?
   What other modifications must I do to use high flow injectors?
   What type of fuels are your injectors suitable for?
   Does your company offer sponsorships?
   I don’t need high flow injectors, can you service my injectors?
   Can you test fuel pumps?


How much horsepower will I gain from upgrading the injectors?

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. 
 


When do I need to upgrade the injectors for my car?

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. 

When airflow increases are substantial and the factory injectors are unable to keep up, larger injectors and/or fuel pressure increases are required.  The factory fuel injection system can usually accommodate an injector that flows about 15-20% more than stock without compromising the idle quality or the low RPM drivability.  If the air flow increase/horsepower target requires an injector that exceeds a 20%  increase over stock, there are several options. 

1.      Re-program the factory ECU specifically for the new larger sized injectors.
2.      Add a piggyback fuel computer that will allow you to control the larger injectors.
3.      Use a stand alone engine management system to control the larger injectors.
 


What size injector do I need for my car?

Please see our injector calculator worksheet on our technical page: Technical Notes
 


Do I need high or low resistance injectors for my application?

Injectors are classified into two categories.
1.  High impedance/resistance (saturated) 12-16 Ohms.
2.  Low impedance/resistance (peak & hold) 0.5-6 Ohms.

Saturated injectors require roughly 1-1.5 amps to open the injector.  Peak & hold injectors initially needs about 4-6 amps, and once open drops to roughly 2-3 amps to keep it open. 

ECU design will dictate the use of one or the other.  Most late model cars will use saturated injectors. 
 


Can the factory injectors be modified?

In some cases, yes.  Certain applications will use an unusual type of injector where  upgrades are not available.  We can modify certain types of factory injectors and increase the flow rate up to 50%.
 


What other modifications must I do to use high flow injectors?

If the injectors are significantly larger (roughly 2 or 3 times larger than the factory injector size), you will need to modify the fuel lines/rail to increase the supply of fuel to the injectors.  Fuel pump upgrades must also be considered.  Stand alone/fully programmable engine management systems must be used and more importantly fine tuned. 
 


What type of fuels are your injectors suitable for?

Our injectors are suitable for gasoline as well as leaded race gas.  Alcohol/methanol is extremely corrosive and should only be used for race only applications where the user can drain the alcohol/methanol and “pickle” the entire fuel system with gasoline at the end of each day.

Hydrogen, Propane and Natural Gas injectors are also available for gaseous applications.
 


Does your company offer sponsorships?

Yes.  We are always looking for highly motivated individuals/race teams that are interested in a mutually beneficial relationship.  Please e-mail or postal mail us a proposal if interested. 
 


I don’t need high flow injectors, can you service my injectors?

Yes.  Injectors over time will develop deposits inside the injector preventing it from functioning properly.  Our service will attempt to solve all of the problems typically associated with worn injectors.  This includes stopping any drips/leaks, uniform spray patterns and flow rates to within 2-3%.  This is accomplished with our ultrasonic cleaning process as well as a high flow reverse flushing.  O-rings, filters and pintle caps are replaced.  A full, before and after, calibration report is also provided for your convenience.
 


Can you test fuel pumps?

Yes.  Our fuel pump dyno can test many different types of electric fuel pumps.  We can adjust the voltage to gauge what differences they would have on flow vs. pressure.  We usually start the test at 35 PSIG and end at about 110PSIG. Many in tank pumps have an internal bleed off, or pop off valve, that limits maximum pressure, and usually operates in the 60 to 70 PSIG range. This test tells you exactly what the Horsepower value, or limit of your pump is.

If you are increasing the horsepower of your engine by 30%, - your fuel pump may not be capable of delivering enough fuel to support the desired horsepower increase.

Example: If you have a pump that supports 200 BHP, Natural Aspirated, it will have to produce at least 100 Lbs. of fuel Per/Hr at system pressure. (Break Specific Fuel Consummation of .50 is considered normal for NA engines.) At the target Horsepower of 260 BHP the pump will have to produce at least 130 Lbs. of fuel Per/Hr ,at your system pressure, to meet your requirements, and may not be able to provide this additional fuel.

Our test will tell you exactly what horsepower your pump will support from 35 PSIG to maximum pump PSIG.