SM4 Manual
by
MRM-Racing
V3.0
50
Selecting boost table based on used gear
The first two parameters in the
Boost setup
menu determine which of the three available
Boost setpoint
tables the SM4 will select, based on which gear we are on.
The
Boost setpoint
tables are where one selects the wanted boost pressure.
Parameter
Boost setpoint 1-2
determines which
gear ratio
, (Kph/Krpm) that will select the
Boost setpoint 2
table instead of the
Boost setpoint 1
table.
The
gear ratio
is in units of kilometers per hour times 1000 divided by the engine speed in rpm.
If the
gear ratio
is above the value set in parameter
Boost setpoint 1-2
, then
Boost setpoint 2
table will be used.
For this to work, it is essential that there is a
Vehicle speed
signal connected to the SM4, and
that
Speed setup
is properly configured. See chapter about
Speed setup
for more information.
If we want to use the
Boost setpoint 1
table on first gear, and the
Boost setpoint 2
table on
gears 2 and up, then set parameter
Boost setpoint 1-2
to a value in between the gear ratios of
first and second gear.
Example:
Lets say that the
gear ratio
on first gear is 8.78 Kph/Krpm, and the
gear ratio
on second
gear is 14.79 Kph/Krpm. (8.78 + 14.79) / 2 = 11.785 Kph/Krpm. Setting parameter
Boost
setpoint 1-2
to the value 11.79 will make it so that the
Boost setpoint 1
table is used on
first gear, and that the
Boost setpoint 2
table will be used on second gear and higher.
Parameter
Boost setpoint 2-3
determines which
gear ratio
that will select the
Boost setpoint
3
table instead of any of the tables
Boost setpoint 1
and
Boost setpoint 2
in the same way
that the parameter
Boost setpoint 1-2
works.
Selecting the
Boost setpoint 3
table has priority over the other two tables. So when the
Boost
setpoint 3
table is selected, the parameter
Boost setpoint 1-2
is overridden. This is true for
both the ways to select
Boost setpoint
table. Either with the
Boost setpoint
parameters or
with external switches.
Lets say we don’t want the boost table to be selected based on choosen gear. Then we simply
disable it by setting both the parameters
Boost setpoint 1-2
and
Boost setpoint 2-3
to a very
high value that will never be reached. For example 300 Kph/Krpm.
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