MSD 2950 Atomic LS2_LS3 Master Kit Installation - Manual (Page 15)

INSTALLATION INSTRUCTIONS 15
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• W W W . A T O M I C E F I . C O M • ( 9 1 5 ) 8 5 5 - 7 1 2 3 • F A X ( 9 1 5 ) 8 5 7 - 3 3 4 4
ADVANCED SETUP
The Advanced Setup features are optional as the Initial Setup
menu provides the Atomic EFI with the values needed to run
the engine. Features in the Advanced Menu are designed to
deliver additional features and advanced tuning functions to
further enhance the driveability and overall performance of
your vehicle. Figure 20 shows several examples.
Fans: The Atomic LS allows you to select temperatures to
activate two electric fans. Each circuit will be activated
by supplying ground through the Red and Orange wires
of the Power Module. A relay is required for both circuits.
The fans will be activated at the desired temperature
and will remain on until the temperature falls below 10°
of the setting. Settings are 100°-300°F.
A/F Targets: The Atomic LS provides an option to set an
air/fuel target for Idle, Part Throttle, Wide Open (WOT),
Nitrous and Boost. The Atomic will use its self-learning
technology to adjust the fuel delivery to meet the target
air/fuel ratio. The values are adjusted in 0.1 increments
and range from rich at 10:1 to leaner at 16:1. The ideal
air/fuel ratio for cruising is called stoichiometric and is
commonly referred as a 14.7:1 air/fuel ratio.
Boost: The Atomic will switch to the commanded Boost A/F
ratio once manifold pressure reaches 110Kpa.
There is also a timing setting for a Wet Nitrous System.
When a nitrous system is activated (as shown by supplying
12 volts on the Brown/White Power Module wire), the timing
will be retarded. Timing can be retarded up to 20° in 0.1°
increments. Note that in order to alter the timing for nitrous
use, the Nitrous Selection in the Advanced menu MUST be
programmed to ENABLE (see Figure 21).
Ignition Timing Adders: The Atomic provides a base timing
table for each engine application. You can also modify
these settings at idle (closed throttle), part throttle and
wide open throttle (WOT). Each setting is adjustable +/-
10°. Note that the values programmed are set for stock
engines using 91 octane fuel. For lower octane fuels it is
recommended to retard the timing 5° as a starting point.
TPS Enrichment: To assist in throttle transitions the
Atomic EFI has a feature to increase fuel delivery by a
prescribed percentage any time there is an increase in
throttle position. If needed, make small changes in no
more than 5% increments without further testing. Most
engines will find 25% being sufficient. Most applications
will accept 15%-35% enrichment. Adjustable from
0-100% in 1% increments.
MAP Enrichment: To assist in manifold pressure transitions
the Atomic EFI offers a MAP enrichment feature. This
functions by adding fuel based on MAP transitions
while moving the throttle. Large cam vehicles with low
vacuum generally required a slightly smaller number
while stock/small camshaft vehicles with a high vacuum
TPS Enrichment
Igniton Timing
Advanced Setup
Fans
A/F Targets
Figure 20