Precision Turbo and Engine BigStuff3 GEN3 PRO SEFI System Hardware & BigComm Software - Manual (Page 25)

BigStuff3 Pro SEFI System
Version 2.1 – February 2011 22
 Trigger three (3) stages of timing and/or boost control (connector locations B, C & D).
All GEN3 DAI systems are all sold with the mating half, 4-way connector, terminal (used for the
“Timer Enable/DAI Trigger wire) and seal.
Connector location “A”, on all GEN3 base systems, enables two (2) functions.
1. The internal timer, referred to as the “Timer Enable”. No matter how the GEN3 system is
configured, or what options the system has, Pin A of the Boost connector will always act as the
internal timer trigger wire (used for boost and traction control, and other optional features). The
timer enable wire (connector location “A”) must have 12V applied to it at the exact moment the
system is configured to start a timing sequence, like boost or traction control. Initiating both the
timing sequence (Timer Enable) and internal data logger (DAI trigger) can be accomplished by
inverting the 12V signal from the brake switch or trans-brake as shown in the diagram below.
2. Internal data logger (know as the Replay function) trigger wire. When upgrades/options are added
to the GEN3 system, the data log trigger wire may be moved to header 2, terminal location Y2.
When the GEN3 system is upgraded to include optional features like DAE, DAE2, SR2 and ETM
traction control, 16 or 24 injector upgrades, and the NTK methanol upgrade, the wire used to trigger
the internal data logger is moved from Hdr. 1, pin location L2, to header 2, pin location Y2. No matter
how the GEN3 system is configured, or what options the system has, Pin A (which runs to Header
connector 1 terminal L2) of the Boost connector will always act as the Timer Enable trigger wire (used
for boost control, nitrous control, traction control, and other optional features).
Note: The “Timer” sequence will be reactivated, every time the throttle is closed and then
opened again, since the “Minimum RPM and Minimum TPS criteria are re-satisfied.
The other three terminal locations (B, C & D) in the Boost connector can be used to turn on three (3)
stages of boost control (via relays), along with corresponding, and independent, timing retard tables for
each stage. The three stage Boost control can also be used to control other types of solenoids (e.g. in a
wet nitrous system).
The boost solenoids
must be turned on using relays, in a low side configuration for each stage.
Each boost stage (solenoid) that is activated has a corresponding timing retard table associated with it.
The timing retard stages can be configured in the BigComm software under Boost from the main tool
bar. If no timing retard is desired, for any one of the three stages, leave zeros in the timing retard
tables.
In order to activate the three (3) boost stages, and corresponding timing retard stages, the following
criteria must be met:
 The minimum RPM and TPS settings under “Boost Parameters” must be met. These
parameters are user configurable. From the main BigComm tool bar go to “Boost” (see screen
print below)
 There must be a value in each of the three timer cells
 The time period, for each of the three timers cells, must be larger than the preceding timer
value even if only one (1) of three (3) stages is going to be used. For example, if stage 1 is set
for .5 seconds, then stage two must have a timer value greater than .5 and stage 3 must have a
timer value greater than the value used in stage 2. If there is a zero value in any of the timer