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PN8388 Datasheet(PDF) 7 Page - Mallory performance club |
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PN8388 Datasheet(HTML) 7 Page - Mallory performance club |
7 / 8 page INSTALLATION INSTRUCTIONS 7 MSD • W W W. M S D PE R F OR M A NC E . C OM • ( 91 5 ) 8 57 - 5 20 0 • F AX ( 91 5 ) 8 57 - 33 4 4 PROGRAMMING THE REV LIMIT A tachometer is required to set the rev limit. The limit is programmed by running the engine at half the desired rpm, then momentarily grounding the Gray tach output wire from the MSD. A Gray jumper wire is supplied to connect to the tach with another tee-splice coming off to use for programming. A switch may also be installed to ease adjustments of the limiter (Figure 12). The default rpm limit is 10,000 rpm and the limit is adjustable from 2,000 - over 10,000 rpm.. 1. Start the engine and bring the rpm to half the desired rev limit (for a 6,000 rpm limit, raise and hold the rpm to 3,000). 2. While holding the rpm steady, short the Gray tach wire to ground for approximately one second. Note that the tach will go to zero while grounded. 3. The tach will now display the programmed rev limit amount for two seconds. If this value does not register on the tach, repeat the procedure and try a different ground source. The MSD Ready-to-Run Distributor has an optional built in Rev Limiter Verification feature. When activated, it will display the rev limit setting at key-on. This feature is not activated from the factory. To enable this feature, follow the procedure below. Note: It is important to note that this feature should not be used with EFI systems. When activated, an rpm signal is sent to the tachometer. With an aftermarket EFI system, this could activate the injectors causing a flooding situation. ENABLE REV LIMIT VERIFICATION 1. With the ignition switch in the off position, ground the Gray tach output wire. 2. With the Gray wire connected to ground, turn the ignition on without starting the engine. 3. Hold the Gray tach output wire to ground for seven seconds. (AT LEAST five seconds.) 4. Release the wire from ground before ten seconds have passed. 5. To confirm the process has worked, cycle turn the key On. The tachometer should sweep to the rpm limit set on the ignition. To deactivate the verification feature, repeat the process. TO TACH OPTIONAL PROGRAMMING SWITCH JUMPER GRAY Figure 12 Setting the Rev Limiter. VACUUM ADVANCE Your distributor is equipped with an optional vacuum advance canister. Vacuum advance is generally used to improve cruising economy and driveability, depending on the application. The chart in Figure 13 shows the relationship between engine vacuum and the amount of ignition timing advance. To connect the vacuum advance, connect a vacuum hose from the canister to a ported vacuum source on the carburetor or throttle body. Ported vaccum sources are located above the throttle plates so there will not be an excessive amount of timing advance at idle and lower engine speeds. 0 2 4 6 8 10 12 14 12345678 910111213141516 Degrees of Advance OE Non Adjustable Vac. Adv. 1808 Figure 13 Vacuum Advance and Timing Chart. |
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