MSD 6520 Digital 6-Plus Ignition Control Installation User Manual

Page 6

Advertising
background image

6

INSTALLATION INSTRUCTIONS

M S D  

•   W W W . M S D P E R F O R M A N C E . C O M   •   ( 9 1 5 )   8 5 7 - 5 2 0 0   •   F A X   ( 9 1 5 )   8 5 7 - 3 3 4 4

REV LIMITER

There are two adjustable rev limits that you can adjust; the Max Limit and the Two Step Limit. Both limits are

adjusted in 100 rpm increments by turning the rotary switches on the side of the Ignition (Figure 4).

Note:

The engine can be running as you make adjustments to the rev limiter and retard function.

Max Limit: This is the overrev rpm limit. The Soft Touch circuitry will begin dropping the spark to cylinders

any time the rpm reaches the amount you select, except if the Two Step Limit is activated (12 volts applied

to the Blue wire). The limit can be adjusted from 2,000 to 9,900 rpm. Setting both dials to Zero defaults to

a limit of 12,500 rpm.

Figure 4 Adjusting the Rev Limits.

Figure 5 Wiring the 2-Step Rev Limit.

Figure 6 Wiring the Retard Stage.

2-Step Limit: This rpm limit is activated

when 12 volts are applied to the Blue

wire. When activated, this limit overrides

the Max Limit. This limit is adjustable from

2,000 to 9,900 and will default to 2,000 rpm

if the dials are set to an rpm below this

range. An example of wiring the 2-Step

Limit so it is activated with the line-lock is

shown in Figure 5.

RETARD STAGE

The MSD features a single stage retard

step that is activated when 12 volts are

applied to the Pink wire. The retard will

remain until the 12 volts are removed.

This retard step can be connected to

a nitrous solenoid activation wire or

micro-switch on the shifter. The retard

is adjustable from 0° to 9.9° in 1/10°

increments. The example in Figure

6 shows connecting the retard to a

nitrous stage.

Note: This retard will only operate

above 2,000 rpm.

Advertising