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instruction sheet carefully before beginning installation, and also take a moment to review the included limited
warranty information. Contact us toll free at 1.877.334.8355 or at
any questions.
Overview
The XR-i electronic ignition module is designed to replace conventional breaker points on small block
Chevrolet and Ford V8 engines with single point distributors. The XR-i requires ballast resistance to limit coil
current.
The XR-i ignition uses a Hall Effect Sensor to detect the lobes of the distributor points cam. Dwell is controlled
by the battery voltage and engine RPM to provide maximum ignition energy and minimum component heating.
The mechanical and vacuum advance mechanisms work the same as with the original breaker points.
Ignition Inspection
The XR-i ignition requires an OE specification distributor cap and rotor to avoid clearance problems and arcing.
You should replace the rotor and cap when installing the new ignition system. For best results, you should also
replace the spark plugs, plug wires, and ignition coil. Carefully inspect wiring to the coil and replace any worn
or frayed sections. For maximum performance, use FAST
CAUTION: Disconnect the vehicle's battery ground cable before continuing installation.
Study the ballast resistance sections carefully. Most installation problems result from improper ballast resistance.
Ballast Resistance
1. All vehicles with OE breaker points ignition are factory equipped with ballast resistance. This can be
external resistance in the form of a ceramic ballast resistor or a resistance wire between the ignition key
and COIL+ terminal. Most Chevrolet vehicles have a resistance wire. Ballast resistance can also be in
the form of internal resistance within the coil. Coils with internal resistance will measure 3 to 4 ohms
from COIL- to COIL+ terminals.
2. If you are changing coils and your vehicle has a ceramic ballast resistor or resistance wire, do not use
any additional ballast resistor that may be provided with the coil.
3. If your OE coil had internal resistance and you are changing to a new coil with lower resistance (such
as an aftermarket performance coil), you must add a 1.2 to 1.9 ohm ballast resistor. If a resistor is not
supplied with the new coil, use a Chrysler style two terminal ballast resistor such as Echlin ICR23 or
Wells CR107. Connect the ballast resistor between the COIL+ terminal and ignition switch.
Quick Test for Ballast Resistance
You can determine if your vehicle has external ballast resistance with this simple test. Disconnect any wires going to
COIL-. Reconnect battery. Turn the ignition key on but do not start the engine. Use a voltmeter as shown in Fig. 2 and
read voltage between COIL+ terminal and ground. It should be about 12 volts. Then momentarily jumper the COIL-
terminal to ground. If voltage at COIL+ terminal drops below 8 volts, there is ballast resistance between the ignition key
and COIL+ terminal. To determine if your coil has internal ballast resistance, use an ohm meter as shown in Fig. 1.
Coils with internal resistance will read 3 to 4 ohms from COIL- to COIL+ terminals.
Toll Free: 1.877.334.8355
www.fuelairspark.com
®
FAST
XR-i Ignition
Points Conversion Ignition System
®
products; we are proud to be your manufacturer of choice. Please read this
FAST
3400 Democrat Rd.
Memphis, TN 38118
Phone: 901.260.3278
INSTRUCTIONS
www.fuelairspark.com
coils and FireWire™ spark plug wires.
®
®
1
under Tech Help with
FAST4-271
Revised 3.16.16
Part #???
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Summary of Contents for Fast XR-i
- Page 1 Chevrolet and Ford V8 engines with single point distributors. The XR-i requires ballast resistance to limit coil current. The XR-i ignition uses a Hall Effect Sensor to detect the lobes of the distributor points cam. Dwell is controlled by the battery voltage and engine RPM to provide maximum ignition energy and minimum component heating.
- Page 2 10. Apply thermal grease to the bottom side of the XR-i module. Install the 6-32 hardware but do not tighten. The jumper wire must be installed on the XR-i mounting ear with the metal pad. The flat side of the ring terminal should contact the XR-i mounting ear.
- Page 3 3. If the light does not flash, repeat test in step 2 with a known good coil. Try disconnecting any wires to ® COIL- other than the black/ yellow wire from the FAST module. The only extra wire normally connected to COIL- is the tach wire. If the light still does not flash, the module may have failed.
- Page 4 Rev Limit Setting The rev limit of the XR-i ignition is intended to be used as a safety feature to prevent engine damage in over- revving situations such as missed shifts. The potentiometer rotates 270 degrees with full counter clockwise position representing 4000 RPM and full clockwise representing 8000 RPM.
- Page 5 Fig. 5 Ford Points Plate Removal Fig. 6 Ford Installation Fig. 7 Completed Installation Fig. 8 Rev Limit Setting ® FAST 3400 Democrat Rd. Toll Free: 1.877.334.8355 FAST4-271 Memphis, TN 38118 www.fuelairspark.com Revised 3.16.16 Part #??? Phone: 901.260.3278...
- Page 6 Limited Warranty which covers defects in material and workmanship for a period of one year from the date of purchase. FAST’s obligation under this warranty is limited to the repair or replacement of its product. To make a ®...
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