OPERATING INSTRUCTIONS FORM 1554M (REV. A) 10/02 ® HYFIRE® 7C CONTROL UNIT PART NO. 676M RPM Switch: NOTE: This feature is not available on the HYFIRE® 667S. The built-in RPM switch can either turn an electrical load off or on at a selected RPM. See below for more detail. NC C NO RPM Limiters: The HYFIRE® 676M Control has three built-in RPM limiters. Each one has a range of 1000 to 12,800 RPM in 50 RPM steps. On the main display, there is a decimal point on the mode digit. When that decimal point is lit up, the RPM limit is increased by 50 RPM. This is the RPM switch (mode 7) relay contact that is normally closed. In other words, as long as you haven’t RPM1 (Mode 1)This is the RPM limit that is always active if you reached the point where the RPM switch is active, this haven’t selected any other RPM limit. contact remains connected to the “common” or “C” terRPM2 (Mode 2) This is an auxiliary RPM limiter that is actiminal. You would use this connection if, for example, vated when you apply 12 volts to the “RPM2” terminal on you wanted to turn something OFF (such as a nitrous the top-side connector. This could be a burnout limiter. system) when you reached the RPM switch point. See When selected, it overrides RPM 1 (the main engine Example 1. protection RPM limiter). See Example 4. This is the common terminal for the RPM switch (mode RPM3 (Mode 3) This is the other auxiliary RPM limiter. It also 7) relay in the main unit. It is connected to the RPM is activated by 12 volts on the “RPM3” terminal on the switch, where it will switch the accessory connected to top-side connector, and overrides both RPM2 and the “NC” terminal OFF, and the accessory connected RPM1. Use this limit as a staging (starting line) RPM to the “NO” terminal ON when the RPM switch value is limiter. See Example 5. reached. The “C” terminal can be used to switch either to power or ground. High Speed Timing Retards: RET1, RET2, RET3 (Modes 4, 5, 6) These are all high-speed This is the RPM switch (mode 7) relay contact that is timing retard functions that are activated by 12 volts on the appronormally open. In other words, as long as you haven’t priate top-side connector terminal. Each higher stage overrides reached the point where the RPM switch is active, this the lower stages, which means that you set each stage for exactly contact isn’t connected to the “C” contact. You would the amount of retard you want, rather than adding up each stage to use this contact to turn something ON (such as a shift get the actual retard. See Example 6. light or an air shifter) at a specific RPM. See Example 2 and Example 3. NOTE: When you apply 12 volts to RPM2, RPM3, RET1, RET2, or RET3 the display will switch to show that function. If you have both an auxiliary RPM limit AND a retard selected, the display will show the retard value. See the accompanying illustrations for some examples of how to use the RPM limiters, the RPM switch, and the timing retard functions. 1 Push this button to change the mode. UP MODE ® VALUE 1 - RPML 1 2 - RPML 2 3 - RPML 3 50 RPM STEPS 8 - HSA SLOPE +50 RPM A - HSA MAX DOWN Push either of these buttons to change the value of the mode. R B - TRIGGER 5 - RETARD 2 C - CYLINDER 6 - RETARD 3 7 - RPM SWITCH D - DEG / PSI E - MAP SELECT 676M MODE 9 - HSA CUT-IN 4 - RETARD 1 P/N FIGURE 1 NOTE: If any button is held down for more than 1/2 second, the displayed value will change automatically. BTR CONTROL CENTER Additional Functions: The HYFIRE® 676M has two more modes that can make the ignition installation and setup work better. One of these is the high speed advance function. This lets you put small amounts of timing in the engine after the torque peak to pick up a bit of horsepower. There are three things that need to be set up for this: the cut-in RPM (Mode 9), the maximum advance (Mode A), and the slope (Mode 8). The cutin RPM is the RPM where you want the curve to start working. The slope is how much the timing will advance every 1000 RPM after the cut-in RPM. The maximum advance is the highest amount of advance you want the system to reach. Once the compensation is set, then the high speed advance settings will be accurate. The factory setting should be correct for most types of flying magnet type crank trigger systems, and should not normally need to be adjusted unless you are using a different trigger type. Number of cylinders selection The next mode that can be set is mode “C”. This allows you to select 4 through 12 cylinder operation. This ensures that the RPML and the timing are proper for the engine. Mode 6F is special—this is for odd-fire V6 engines ONLY! The cylinder firing spacing should For example, say that your engine has the torque peak at 6500 RPM, be 45/75 (at the distributor) or 90/150 at the crank. and you want to add some timing after this. You might want to start adding timing after 7000 RPM, so this becomes your cut-in speed. If MAP Sensor Functions: you then want 2 degrees additional timing at 8000 RPM, then the The 676M has two modes for use with a MAP (manifold absolute slope would be set for 2 degrees per 1000 RPM. However, let’s say pressure) sensor. Mode “d” lets you select the number of degrees of that you don’t want more than 2 degrees of advance, so you would set retard per pound of boost, from .1 to 4 degrees. Mode “E” lets you the maximum advance at 2 degrees. See Example 7 for more detail. select the type of MAP device. Typical MAP sensors used in turbo/ supercharged engines are either 2 or 3 bar range, and these The other similar mode available is trigger compensation, which is correspond to “2” and “3” in mode “E”. Selection “1” is different. This set when the mode indicator is “b”. This lets you compensate for the is not made for a 1 bar MAP sensor. Instead, selection 1 lets you use various delays in ignition timing caused by both electronic and me- an external 0-5 volt signal to control a 0-20 degree retard. This signal chanical changes. To set the trigger compensation, set mode 9 to could be from an external dash-mount control, such as the Mallory 5000 RPM, and mode 8 to zero. What this does is tell the system to 29784, or from an external proportional nitrous controller. start the high-speed advance at 5000 RPM, but with a slope of zero, there should be no advance. Once the system is set up this way, MAP sensor and extension harness are not supplied with 676M. watch the timing as the engine revs past 5000 RPM. If the timing Part numbers are: does not stay at a steady value (once the 5000 RPM point is reached) 716 2 bar MAP Sensor then adjust the compensation value until it is as flat as possible. For 717 3 bar MAP Sensor example, if the timing retards slightly as the RPM goes up, increase 29785 Extension Harness the compensation value. If the timing advances slightly as the RPM NOTE: The 3 bar MAP Sensor (PN 717) and Extension Harness goes up, decrease the compensation value. (PN 29785) are included when a complete Mallory 667BTR NOTE: This function is only valid for RPM above the highIgnition System is purchased. speed advance cut-in RPM. If you have the high-speed advance cut-in set above the normal operational range of the motor, the compensation function does nothing. 2 Example 1 Using the RPM switch (Mode 7) to turn OFF a nitrous system at a particular RPM (Not available when used with the HYFIRE® 667S) NC C NO RPM2 RPM3 RET1 RET2 RET2 From Nitrous Activation Switch To Ground COIL CONTACT COIL CONTACT To +12 Volts To Nitrous System RELAY—Use a relay if you are switching more than 3-5 amps. Example 2 Using the RPM switch (Mode 7) to turn ON a shift light (Not available when used with the HYFIRE® 667S) Example 3 Using the RPM switch to activate a retard stage at a particular RPM (Not available when used with the HYFIRE® 667S) Example 4 Burnout RPM Limiter (Mode 2). NC C NO RPM2 RPM3 RET1 RET2 RET2 NC C NO RPM2 RPM3 RET1 RET2 RET2 NC C NO RPM2 RPM3 RET1 RET2 RET2 To Ground To +12 Volts To +12 Volts To roll control switch that supplies +12 volts when active 3 Example 5 NC C NO RPM2 RPM3 RET1 RET2 RET2 Staging RPM Limiter Example 6 Using the high-speed timing retard function with a 3-stage nitrous system. Example 7 To clutch pedal or transbrake switch that supplies +12 volts when active NC C NO RPM2 RPM3 RET1 RET2 RET2 CUT-IN (Mode 9) This is the RPM where the timing starts to advance. This example shows a cutin of 7.0 (7000 RPM). To nitrous stage 1 (+12 volts when active) To nitrous stage 2 (+12 volts when active) To nitrous stage 3 (+12 volts when active) SLOPE (Mode 8) This is how much the timing advances for every 1000 RPM. This example shows a slope of 2.0 (2 degrees per 1000 RPM). MAXIMUM ADVANCE (Mode A) This example shows a maximum of 2 degrees advance. ADVANCE 8 6 4 2 0 RPM 0 2000 4000 MALLORY IS A DIVISION OF THE MR. GASKET PERFORMANCE GROUP 550 MALLORY WAY, CARSON CITY, NEVADA 89701 (775) 882-6600 FAX (775) 887-4326 www.mrgasket.com 4 6000 8000 10k FORM 1554M (REV. A) 10/02 Made in U.S.A. Printed in U.S.A.