P/N: 4FA020-010
© 2008 Vortech Engineering, LLC
All Rights Reserved, Intl. Copr. Secured
25MAR08 v4.0(86-93 5.0 Mus (4FA v4.0))
13
Example of Ignition Retard vs. Boost:
14. IGNITION/BOOST CONTROL INSTALLATION
(High Output and Cobra systems only) cont'd.
A. The Ignition/Boost Control unit is designed
to retard ignition in relation to boost.
B. The unit is adjustable from 0° of ignition
retard to 3° of ignition retard for each pound
of boost, up to a maximum of 15°.
C. Using the 1° per pound position as a starting
place, adjust the ignition retard knob until
just beyond the point of detonation. Use
third gear for testing in a safe area or road.
Adjust the retard according to changes in
altitude and fuel quality.
CAUTION:
It is extremely important
that the boost retard never
be turned to 0°. It is recom-
mended that in stock street
applications, the knob be
positioned at 1° per lb. to
start.
Fig. 15-a
15. IGNITION/BOOST CONTROL UNIT OPERATION (High Output and
Cobra Systems only)
Fig. 14-b
BOOST
RETARD
0
1
2
3
SUPERCHARGERS
Ignition/Boost
Control
MANUFACTURED FOR
VORTECH SUPERCHARGERS
BY
MSD
¨
BLACK
WHITE
RED
ORANGE
BLACK
WHITE
RED
ORANGE
IGNITION
COIL
FROM FACTORY COIL HARNESS
MAGNETIC PICKUP
CONNECTOR (NOT USED)
BOOST
RETARD
CONNECTOR
GROUND
TO MANIFOLD
VACUUM
15
10
5
5 psi at 3° per lb.
7 psi at 2° per lb.
10 psi at
1/2° per lb.
MAX.
RETARD = 15°
DEGREES
OF
RET
ARD
5 7 10
PSI BOOST
