KMS MP25 - Page 15

KMS MP25(M)/MA25(M) manual Version 4.2
15
Warning:
When using wasted spark, the read out on the timing light must be divided
by 2. A timing light displaying 20 degrees advance with wasted spark is in
reality 10 degrees ignition advance.
Coil on time:
A coil should be charged before every discharge (plug spark). The coil charging time is indicated in
ms. It should normally be 1.4 to 3.5 ms depending on the type of coil. Longer coil charging leads to
unnecessarily high-power consumption and heat development, shortening the service life of the
coil.
Warning:
The coils can only be operated via a driver circuit. If the computer is
connected to the coil directly, the ECU can get damaged beyond repair.
Many modern coils feature a built-in driver stage. However, if a coil without
an integrated driver stage is used, the separate KMS ignition driver module
with KMS partnumber KAC.05.001 will be needed.
Dis-coil:
The choice is between dis-coil (wasted spark) and single coil control (rotor and distributor cap). If
you have a dis-coil (and also when using coil per plug wasted spark) the box has to be ticked.
Tacho output:
Select the amount of cylinders of the vehicle. You can choose between 4, 5, 6, 8 and 10 cylinders.
For a 1, 2 choose 4 cylinders. For a 3 cylinder choose 6 cylinder.
Warning:
For adaptation to a 5, 8 or 10 cylinder configuration, ensure that the ‘No. of
cylinders’ has been specified correctly before connecting the coils. If the
coils are connected with the numbers of cylinders incorrectly set, the coils
(via output 4 and 5) can get seriously damaged.
Firing tooth under 500 rpm:
This is for setting the number of teeth before TDC at which an ignition impulse is given (under 500
rpm). Keep this number as low as possible to prevent backfiring when the engine is started. For
engines with a high compression ratio, it is recommended not to set this to a number higher than 1.
Injection in ‘x’ stroke mode:
The injection frequency (x) can be set to:
➢ 2 times per crankshaft revolution (x = 1)
➢ 1 time per crankshaft revolution (x = 2)
➢ 1 time per two crankshaft revolutions (x = 4)
Normally, it is recommended to select the 4-stroke setting.