MSD 7550 Programmer_Monitor for Programmable Digital 7 Series Ignitions Installation - Manual (Page 4)

4 INSTALLATION INSTRUCTIONS
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RPM Limit Menu
Press Next until RevMax flashes, then press ENTER. This takes you to the RevMax rpm program
screen.
RevMax Menu
Press Next until the RPM flashes, then push the ⇑ or ⇑ button until your value is shown. Then press
Enter which will take you to the Save Menu.
Save Menu
Save will be flashing so press Enter. The screen will go back to the RevMax rpm value to show the
new value/program.
Figure 4 Changing the Overrev RPM Setting.
PROGRAMMING A RUN TIMING CURVE
When using the Programmer to build a timing curve, you must program a timing value for every 100
rpm. If you skip a step, the timing retard will return to the default setting (no retard) for that rpm range.
It is highly recommended to draw the timing curve on a graph and figure out the degree/rpm steps
before attempting to program it into the Ignition.
MSD built in a copy function that will program the same amount of timing for each rpm though each
step still needs to be Entered.
Following is an example of programming the Run curve. With the timing on the engine set at 36°, we
want it to be 16° at idle and begin ramping up at 1,000 rpm. By 3,000 rpm we want to be back at the
full 36° (This means 1° per 100 rpm steps).
To get this incremental amount, divide the rpm range of the curve by 100 (rpm increments). Take this
result and divide it by the total amount of timing changes to come up with the amount of timing that
needs to be adjusted per step (100 rpm).
Main Menu
Press Next until Retards flashes, then press Enter.