PFI - Performance FI

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Ride Your Harley Longer, Faster and Harder!

Good equipment can transform an average ride into an incredible one. If you have a carbureted bike and have always wanted the killer performance of a fuel injection system for your Harley, the Pegasus is just what you've been waiting for.

Pegasus is the most innovative part to hit the Harley Davidson performance industry in years. It can help you create your dream ride whether you're building a ground-up custom or want a Harley Davidson aftermarket engine management system for your V-Twin.

Take to the road with Pegasus, here's what you'll get:

  • A smoother, more efficient, and powerful engine
  • Lower operating temperatures
  • Significant improvement in gas mileage and lower emissions
  • Easy to use software to give you complete control over fuel delivery and ignition
  • Increased horsepower
  • Improved throttle response and performance
  • The best engine-management and fuel-injection product in the industry
  • Outstanding customer support

The Pegasus Kit

This fuel injection kit forHarley VTwins includes everything you need for a turn-key system; throttle body, fuel injectors, ECU, sensors, fuel pump, ignition coils, wiring harness, and all mounting brackets! Our easy to use software gives you complete control over fuel delivery and ignition.

The primary components are proudly made and assembled in the USA.

Boost Your Ride

Harley fuel injection system

If you have a large motor, or just want your 80-incher to feel big, then you want the Pegasus fuel injection system on your bike. Best described by bikers who say "when you grab a handful, you go...now!!" because the torque just keeps coming.

  • Advanced semiconductor electronics
  • Controls both fuel and ignition
  • Sequential timed injection
  • Single fire ignition
  • Enhanced fuel atomization
  • Multiple spark discharge
  • Easy adjustments by rotary switch or laptop
  • Uses automotive sensors-available everywhere
  • Teflon coated, silver alloy wire and weatherproof connectors
  • Machined from billet aluminum-huge 53mm throttle!
  • Easy to tune: use the spark plug method or use our closed loop control and dyno tuning
ProductPricePurchase
Complete Pegasus EFI Kit$1995
Magneti Marelli Replacement EFI Kit$1895
Pegasus Twin Cam EFI Kit$1995
Delphi Replacement EFI Kit$1885
Optional: Fuel Pump and Coil Motor Mount Bracket$150
Optional: Soft Tail Top Motor Mount Bracket for Fuel Pump$40

The Pegasus aftermarket system is designed for Big Twin/Sportster style motors, including those made between 1970 and 1999 with a cam ignition pickup or Twin Cam engines which Harley phased in after 1999. Specific engine types supported are:

  • Panhead
  • Shovelhead
  • EVO style engines
  • Twin Cam engines

The complete kit contains everything needed for turn-key replacement of a Harley carbureted fuel management and ignition system. Besides the throttle body assembly, which includes the injectors, fuel regulator, and ECU, the kit includes a high pressure fuel pump, petcock, coil, air cleaner assembly and filter, and all necessary wires and fuel lines. Also included are PerformanceFI's custom timing wheel and cam position sensor (for the EVO style engines).

Pegasus Twin Cam Kt

The Twin Cam kit contains everything needed for a turn-key replacement of a Harley-Davidson Twin Cam fuel management and ignition system. Besides the throttle body assembly, which includes the injectors, fuel regulator, and ECU, the kit includes a high pressure fuel pump, petcock, coil, air cleaner assembly and filter, and all necessary wires and fuel lines. Also included is our proprietary signal translation module that connects the Harley timing sensor to the ECU.

Magneti Marelli Replacement Kit

The Magneti Marelli kit is specifically designed to replace the fuel and ignition components on a Harley Davidson that is equipped with Magneti Marelli electronic fuel injection. Besides the throttle body assembly, which includes the injectors, fuel regulator, and ECU, the kit includes a coil, air cleaner assembly and filter, and all necessary wires and fuel lines. This kit does not contain the components that are already in the fuel tank like the fuel pump, filter, and petcock.

Delphi Replacement Kit

The Delphi kit is designed to replace the fuel and ignition components on a Harley Davidson that is equipped with Delphi's electronic fuel injection. Besides the throttle body assembly, which includes the injectors, and ECU, the kit includes a coil, air cleaner assembly and filter, and all necessary wires and fuel lines. This kit does not contain the components that are already in the fuel tank like the fuel pump, filter, regulator, and petcock.

The best way for us to show the power and performance of the Pegasus system is through dyno run graphs.

The graphs below come from Bill Chambers of Bill Chambers Racing (www.billchambersracing.com). Bill has been racing motorcycles for over 40 years and has worked on every type of VTwin there is. He runs the Pegasus system on his racing bikes and on his everyday motorcycles.

You can see that the Pegasus system delivers incredible horsepower and torque for everything from an 80 in EVO to a 151 Dual Throttle. Compare these numbers to what your carb is giving you.

If you didn't want power, why ride a VTwin?

Click on any thumbnail to see a bigger image.


Dave Isley 80 CI Sporty


Mil's 80 CI Grey Bike


117 Big Dog w/ Pipe


117 CI Hot Setup


151 CI Dual Throttle


Revtek run1


Revtek run2


Revtek run3


Dave Isley's Sporty


Nitrous on Mil's Black Bike

Limited Warranty

PerformanceFI ("we") warrants that its Pegasus Fuel Injection System (the "System") will be delivered in working order free of defects in materials or workmanship.

What Does This Warranty Cover?

This warranty covers any defects in materials or workmanship for the parts that makeup the System.

What Does This Warranty Not Cover?

This warranty does not cover consequential or incidental damages due to use of the System. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you.

What is The Period of Coverage?

This warranty remains in force for one year from the date the System is delivered to the original purchaser.

Who Is Covered?

This warranty covers the purchaser of the original System on whose motorcycle the System is first installed and anyone else who owns the System during the warranty period.

What Will We Do to Correct Problems?

We will repair or replace free of charge any defective parts not the result of improper installation, incorrect use or misuse, accident, improper repair, or normal wear and tear.

How Do You Get Service?

Contact PFI on our Technical Support line (1-800-683-1519 ext 100 ) and describe the problem. You must return any parts that may be defective to us.

How Does State Law Relate to This Warranty?

This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.

Harley Davidson fuel injection system

The Pegasus software lets you completely control your motor's fuel management and ignition characteristics for all types of riding and starting conditions. With Pegasus, you can easily change the necessary settings with simple configuration commands. With Pegasus 7.0 software you can:

  • Download different PFI map files to precisely fit your engine
  • Alter fuel and ignition maps depending on your cam, pipes, and riding style
  • Change parameters such as engine displacement, rev limit, v-angle, enrichment, starting parameters, and much, much more
  • Collect engine data real-time and plot it
  • Run closed loop on a dyno to create your own maps
  • Diagnose problems

Although powerful, Pegasus software is easy to use. Only a few settings are needed to get you on the road to significant improvement over your carburetor. The Pegasus electronic control unit (ECU) comes loaded with the correct displacement and other settings just for your engine, making upgrades optional.

Installation and Use

Simply download the software here [add link to it]; install it on your laptop and attach your laptop to the serial port on the ECU. Upload the maps in your ECU and begin tweaking. Once finished, send the maps to the ECU, and you're ready to ride! Repeat until your bike performs exactly the way you want.

Fuel Map

This is an example of a typical "fuel map". To adjust one of the 256 points on the map, just drag the point around to change the fuel percentage or use the table editor to see the data in a tabular format. Changes can be sent automatically when you complete a page, or in batch mode after you have finished all of your changes.

Fuel Map

For a more complete description of the maps and parameters, see the PFI EZ Setup.

Legal in California for off-road use only. Please go here for customer waiver information.

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Read About Other Harley Riders' Experience with the Pegasus System

Check out this review of the Pegasus system by Easyriders Magazine

(Special thanks to Joe Teresi and Cathy Gibson at Paisano Publishing for providing a copy of this article. Note: this file is approximately 53MB and may take longer to download)