Vortech 1987-1996 Ford 5.0L/5.8L Truck/SUV - Manual (Page 22)

P/N: 4FC020-010
©2000 Vortech Engineering, Inc.
All Rights Reserved, Intl. Copr. Secured
13SEP00 V1.3
(86-93 5.0 Lt Truck(4FC))
15. IGNITION/BOOST CONTROL UNIT OPERATION
A. The Ignition/Boost Control unit is designed
to retard ignition in relation to boost.
B. The unit is adjustable from 0
°
to 4
°
of ignition
retard for each pound of boost, up to a
maximum of 20
°
. (See Figure 15-a .)
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.
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
Example of Boost
Caution: It is extremely important
that the boost retard never
be turned to 0
°
using pump
fuel. It is recommended that
in stock street applications,
the knob be at no less than
1
°
per lb.
12
Figure: 15-a