Catalog #70024 & 70025
Brochure No. 63-0182
Page 3 of 6
©2008 Edelbrock Corporation
Rev. 6/08
JET MAP INFORMATION
Edelbrock engineering has conducted dyno testing with the Victor Jr. system to provide jetting maps for two separate plates at different jetting
levels. These jet combinations are supplied with this system to enable you to vary your engine’s power output.
DOMINATOR-FLANGE JET MAP
SQUARE-FLANGE JET MAP
NOTES:
All of the jet maps shown on this page were developed using a steady fuel pressure of 6.5 psi. Variations in fuel pressure can create a
rich or lean condition which could potentially damage the engine. All jet maps shown on this page require 110 Octane or better race gas to prevent
detonation. The provided timing adjustments represent a suggested guideline only, various engine components will affect the ideal ignition point.
Edelbrock recommends an NGK spark plug 2 heat ranges colder than what the engine would run naturally aspirated for use with all power levels
shown on this page. When in doubt, always go to the next cooler heat range plug.
The dyno tests were conducted at Edelbrock using a highly modified Big Block Chevrolet. Modifications included Edelbrock intake manifold,
cylinder heads dyno headers, pistons, rods, crankshaft, and improved ignition. These tests were conducted with 950 psi nitrous and 6.5 psi fuel
pressure. All stated timing adjustments listed in the jet map is where the motor being tested worked best. Final timing should be adjusted to
achieve best power and/or MPH per application.
See section “5.0 Ignition Timing and Nitrous” for more information on timing selection.
Any variations in jetting patterns other than what is listed above and engine damage could occur. Please contact Edelbrock Technical Department
with any questions you have concerning jetting patterns and their effects on engine performance.
The Victor Jr. Series Nitrous Systems are intended for single-plane manifolds only.
Do not use a dual-plane manifold
with the Victor
Jr. Series Nitrous Systems. In testing, we found that dual-plane manifolds have some distribution problems at these super high flow rates that
could cause serious engine damage.
14.
Using the jet chart below, select the appropriate jets for the
corresponding horsepower setting that you wish to use.
It is
always wise to start with a lower horsepower selection and
progressively step up to your intended power setting to be sure
that the engine can handle the extreme increase in horsepower.
Be sure that you install the fuel jets in the fuel jet holders
and the nitrous is the nitrous jet holders. Failure to install
the jets correctly may cause serious engine damage.
Both
the fuel and the nitrous inlets to the plate are etched next to their
correct fitting. Be sure not to mix the two up. At right is a picture
of a jet being properly installed.
15.
Install the 4 red 4AN x 3AN Steel Braided hoses from the 4AN tee outlet fittings of the Performer RPM Fuel Solenoids to the Fuel Jet
Holders on your Victor Jr. Nitrous Plate.
16.
Install the 4 blue 4AN x 3AN Steel Braided hoses from the 4AN tee outlet fittings of the Performer RPM Nitrous Solenoids to the Nitrous
Jet Holders on your Victor Jr. Nitrous Plate.
17.
Install the 2 blue 6AN 15 inch Steel Braided hoses from the inlet fittings of the Performer RPM Nitrous Solenoids to the supplied blue
6AN Tee fitting.
18.
Route the 6AN feed line through the same route as your previous 4AN feed line, if possible. Connect one end of this line to the bottle
nut and the other to the blue 6AN Tee Fitting.
Approximate HP Gain
Nitrous Jet
Fuel Jet
Timing Adjustment
200
35
35
7°-9° retard
300
50
50
11°-13° retard
400
59
59
15°-17° retard
Approximate HP Gain
Nitrous Jet
Fuel Jet
Timing Adjustment
200
35
35
7°-9° retard
300
48
48
11°-13° retard
400
57
57
15°-17° retard
