Vortech 1993-1996 5.2L Grand Cherokee - Manual (Page 22)

14. 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
°
of
ignition retard to 4
°
of ignition retard
for each pound of boost, up to a
maximum of 20
°
C. Using the middle position (knob
pointing straight up) 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
°
using pump fuel. It is
recommended that in stock
street applications, the knob
be at no less than 1
°
/lb.
15
10
5
5 7 10
[5 psi at 3
°
per per lb.]
[7 psi at 2
°
per per lb.]
[10 psi at 1/2
°
per per lb.]
psi Boost
Degrees of Retard
Maximum Retard = 15
°
16
Example
Maximum Retard = 20
°