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carburetor, headers, fuel injection pump, fuel, etc.
Holley Jets.
Read the Tune-Up Information section before using this program. The Holley Jet change
program is designed to work with Holley carburetor jets from #50 through #100. The program
utilizes actual jet flows as opposed to drill sizes when making the computations. Use this program
with the baseline tune up information to predict the proper jet to use as the ADR changes.
Important: Use only unmodified Holley flowed jets with this program. The Holley Jet program will
not make accurate predictions for methanol or nitromethane fuels. The Precision Jet program can
be used for carburetors with a single orifice main metering system using other than gasoline fuel.
Press the SAMPLE key and allow the weather analyzer to stabilize on the = Sampled Wthr =
screen. Press TUNE-UP then Jetting Menu then Holley to start this program.
Display Example:
== Holley Jet ==
Base ADR? 95.7 (Enter ADR from baseline tune up)
New ADR? 99.2 (Press IMPORT WEATHER DATA to import ADR)
Base Jet? 88.0 (Press in baseline tune up jet number)
Adjust %? 0.0 (Enter tune up change, if needed. See TUNE-UP ADJUST,
page 17.)
New Jet#= 89.1 (Calculated new jet number)
Different size primary and secondary jets or staggered jet sizes can be quickly checked by using
the Recalculate Function. See the Program Access and Use section for details.
Precision Jets.
Read the Tune-Up Information section before using this program. The Precision Jet program is
designed to work with precision drilled/reamed and flowed jets. Hand drilled jets are not accurate
enough for precise fuel metering. This program is designed to accept carburetor jet diameter in
inches or millimeters. Make sure to enter the decimal point and zeros to denote the diameter
dimension. It will work with any fuel. Use this program with the baseline tune up information to
predict the proper jet to use as the ADR changes.
Press the SAMPLE key and allow the weather analyzer to stabilize on the = Sampled Wthr =
screen. Press TUNE-UP then Jetting Menu then select Prec Jets to start this program.
Display Example:
== Prec. Jet ==
Base ADR? 95.7 (Enter ADR from baseline tune up)
New ADR? 99.2 (Press IMPORT WEATHER DATA to import ADR)
Base Dia? 0.032 (Press in baseline tune up jet size)
Adjust %? 0.0 (Enter tune up change, if needed. See TUNE-UP ADJUST,
page 17.)
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