Wren 44 Kerostart Supplement
Copyright Wren Turbines Ltd 2012. All rights reserved.
Page
9
Settings used in ECU.
A Wren supplied kerostart engine package will already be
adjusted for optimum ECU and pumps settings and should need
little or no attention, so do not fiddle with the settings.
As the fuel pump wears it may be necessary to adjust settings –
see later.
An upgrade set of kerostart parts will have the ECU supplied
pre-programmed with initial values but may need tuning to get
clean and secure starting for the particular engine and install.
Please note,
no
two installations will be truly identical so
do not
swap settings with a colleague with a similar engine as they will
most likely not be compatible.
If the fuel pump is replaced, new settings may be required as no
two pumps have precisely the same characteristics.
A problems checksheet follows in the next couple of pages. It
lists common faults and the likely cures and hopefully will solve
your problem quickly.
Please use the checksheet before calling us – it is there to help
you to save time trouble and expense.
If you find something not covered then of course mail us with a
description and we will try to help you:
Please note, we can only help users with a kerostart issue on a
Wren engine.
ECU default values and adjusted settings:
Item:
Initial value:
Your values:
Pump start point
030-50
Pump start ramp
004
Glow power
6.9v
Low battery volts
6.0v
Starter power at ignition
060
Starter power at fuel ramp
070
RPM point 100% starter power
25,000
RPM starter off
30,000
RPM reconnect starter
27,000
RPM Ignition kero
7,000
Pump power ignition kero
31-50
Engine min flow %
55-60
EGT end preheat ‘C
180-200
RPM preheat kero
12-14,000
RPM fuel ramp kero
20,000
Preheat fuel
50-70
Ignition timeout sec’s
24.5
*Items highlighted adjusted for fine tuning*
DO NOT TWIDDLE WITHOUT REASON
