Powerjection 1 FAQ

1) How do I know which kit to choose for my engine?

Ans: We recommend the 750 cfm kit for engines with less than 450 CI and less than 500HP and the 1200 cfm Kit for healthy 550+ hp engines and most big block applications. For 2x4 applications the 750 cfm throttle bodies are the way to go.

2) Does your system provide the capability of ported vacuum and/or full time vacuum? What about a PCV valve port?

Ans: Our Powerjection 1 throttle bodies have both ported and un ported vacuum ports as well as a constant port for power brakes and PCV.

3) What would be the total dimensions from intake to top of carburetor for this application? (I am pushing space limits.)

Ans: The Powerjection 1's dimensions are almost identical to the standard 4150 series double pumper carburetor. It is 11.5 inches long and 3.5 inches at its highest point.

4) How customized can I get with the fuel tables?

Ans: The base calibrations the system uses to start you off are pretty close but advanced tuners can customize fuel and spark tables to completely calibrate the system to your engine, although this is rarely necessary!

5) Can it be tuned for various A/F ratios as a factor of throttle position?

Ans: The Powerjection 1 is a speed density closed loop system which uses throttle position as well as manifold pressure, engine temp, and O2 feedback to deliver the precise A/F ratio for all load and boost pressures.

6) Is software for the PC included so as to be able to monitor the system during use? (I.e. put a laptop in the car and get real time feed back on performance during driving so as to make changes on the fly).

Ans: YES. The Smart Tune software operates in real time and most engine parameters are displayed on the Dash Board interface, which can be used to edit the system for desired performance.

7) What is the max PSI fuel pressure I can feed to the unit?

Ans: Standard fuel pressure is 45 PSI for the standard Powerjection 1 750 cfm with the internal fuel pressure control. For the Powerjection 1 1200 cfm an adjustable pressure regulator is used as well as a return line to the tank, in these applications higher pressures can be achieved although rarely needed.

8) My system is currently set up with true duals with no cross-over pipe. Where will you suggest I place the O2 sensor? Do I need / can you system support two sensors (one for each bank of cylinders)? How are your sensors mounted? Are they "standard" parts that I will be able to obtain replacements locally if needed?

Ans: The system requires only 1 O2 sensor (supplied) and it is mounted in the collector with the supplied weld in bung. We use a standard Bosch O2 and they are available at local parts suppliers. Dual O2 sensors are not necessary and are not supported by the system.

9) Will this work on a roots style blower set up?

Ans: Absolutely! The design of the throttle bodies and the boost compensating capabilities of the computer make it a natural for supercharged applications.

10) Can you use two throttle bodies with one computer?

Ans: Dual throttle bodies can be used with a single EMS using an optional wire harness. The system requires only 1 throttle position sensor and can be left off of the second throttle body.

11) I have a 305 Chevy Motor with TBI. injection. I have the stock ignition system with a spark control module and knock sensor. Can this unit be used in this type of set up and will the ignition system be compatible or will modifications have to be made to the electronic HEI ignition?

Ans: The computer controlled HEI and ford Thick Film computer controlled ignitions are fully compatible with the Powerjection 1 system.

12) I have a mild 350 Chevy could two of these be used on a 2x4 intake?

Ans: Yes they can, I would recommend using the Soft progression secondary throttle linkage on both throttle bodies. This would allow the engine to operate on only 4 barrels until you nail the throttle and the engine demands more air.

13) My car already has a return line on the fuel system so can your system work with that or is it best to cap off the return line?

Ans: If your car has a return line use it.