AMP EFI MS3Pro - Nissan SR20; Nissan RB25; Ls1; Yzf1000

5.3 Ignition settings 5 SETTING UP A BASIC CONFIGURATION
The low resolution signal runs to CKP. Because of the high frequency of the high resolution signal, it needs to
be connected to the Digital Frequency In or Digital Frequency In 2 input instead of the CMP signal. You will need to
specify which frequency input is used in the Ignition Options / Wheel Decoder menu. Ignition input capture needs
to be set to Falling Edge, and the Spark Output needs to be set to Going High if using the stock ignition module.
5.3.31 Nissan SR20
This mode is used for the RWD version of the SR20DET with coil on plug ignition. These engines use an optical
CAS with four unequally sized slots and a row of 360 slots. It wires up exactly like the Optispark and uses the
same settings.
5.3.32 Nissan RB25
Known applications include:
• Nissan Skyline RB25DET, RB26DETT, RB20DET
• Nissan VG30DE and VG30DETT
This mode works for Nissan engines that used six unequally sized slots; it does not work for earlier VG30E
applications which used a distributor and one long slot with five short ones. It wires up exactly like the Optispark
and uses the same settings.
5.3.33 LS1
This mode is used on the Chevrolet LS1 and related LSx V8 engines with the 24X wheel. The CKP input wires
to the 24X sensor and the CMP input wires to the 1X sensor. Both are Hall effect sensors, but do not require pull
ups. This spark mode looks like it might be the “dual wheel” mode, but if you look closely at the crank trigger, you’ll
see that the edges of the crank wheel are different lengths. The MS3Pro can use these different lengths to sync
faster and avoid the sorts of problems caused by timing chain stretch causing the cam sensor to trigger on different
teeth.
Ignition Input Capture needs to be set to Rising Edge for MS3Pro, and spark output needs to be set to Going
High.
For LS2 and other engines in the Gen IV family with a 58X crank wheel, see the examples under Toothed
Wheel.
5.3.34 YZF1000
This is used on Yamaha motorcycle engines with 7 small holes and 1 long recess in the crank trigger. There is
no cam sensor in this mode, so current firmware only supports wasted spark and semi-sequential fuel. Known
applications include the following Yamahas:
• YZF1000 / Thunderace
• FZR1000
• FZR750
• FZ700
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 94