CAS
The famous E15ET turbo distributor fits in an A12 and uses an optical crank angle sensor (CAS). Optical CAS was used as a trigger for ECU-based electronic spark control. 280ZX Turbo used it as did S13 and many other Nissans.
Overview
Nissan optical sensor & wheel
See Main Article: Hitachi D4P Distributor
Under the cover plate is a trigger wheel for the ECU.
Photo: Mitsubishi T4T84471 6626, Nissan 22100-27M15 from USA 1987 KPB12
The crank angle sensor is a thin aluminum disc, which is actually perforated 360 times. In this photo you can make out the screw under the disc, seen through the perforations.
retouched photo (marked to show degrees)
Note the second (inner) row of perforations. These are the Cam position marks.
The photosensor is a Mitsubishi unit that read light pulse through the slits in the trigger wheel
http://i297.photobucket.com/albums/mm219/ddgonzal/wiki/KA24E_CAS.jpg
E-series CAS
A.k.a. Crankshaft Position Sensor (CPS).
Fits in Datsun 1200 engine. Only the A12 distributor gear needs to be swapped. For A14/A15 and newer A12, the hold-down needs to be modified
E16I throttle-body fuel injection E15ET EGI multi-port fuel injection
MITSUBISHI Crank Angle Sensor J912 (NISSAN 22100-53J11)
STANDARD MOTOR PRODUCTS # LX653 Rock auto Fits: 1987-1994 Subaru DL/GL/Loyal 1987-1989 Subaru XT 1993-1998 Mercury Villager 3.0 1991-1994 Infiniti G20 SR20DE 1988-1990 Isuzu Trooper 2.6/2.8 1984-1986 Nissan S12 200SX CA18ET 1989-1990 Nissan S13 240SX KA24E 1981-1983 Nissan S130 280ZX Turbo 1984-1989 Nissan Z31 300ZX VG30/VG30T 1986 Nissan 720 Z24I 1990 Nissan Axxess KA24E 1986-1994 Nissan D21 Z24I, VG30, KA24 1985-1994 Nissan Maxima VG30E 1992-1993 Nissan NX GA16DE, SR20DE and many more Nissan
S13 CAS
SR20
J920 sensor J565A sensor
Two version: CAS vs CAS/Distributor. The Turbo CAS for Coil-On-Plug ignition
SR20 CAS converted for use with A-series engine.
The SR shaft is longer than the A-series distributor
The gear needs to be swapped
Mods likely include: 1) Shortening shaft and 2) shortening housing
SR20 CAS unit disassembled
RWD SR20DET bolts to front left side of head (RS13 engine shown)
FWD SR20DE bolts to back of head (GRi-R shown)
http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/AWDSC00018.jpg
KA24DE
KA is an L-series descendent so uses a distributor like the L20B but with a gear on the end.
Has an 8-2-2-2 slit wheel.
J563 S13 KA24 Ignition Optic Sensor Kit BECK/ARNLEY 1800233 STANDARD MOTOR PRODUCTS LX653
CA18DET
Mounts on the front of the CA18, directly at the end of the left camshaft
http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/page_2.jpg
1988 Nissan Pulsar NX with CA18DE engine RockAuto.com * Nissan 23731-85M10 * STANDARD MOTOR PRODUCTS PC25 (CPS) * CARDONE 84S5405/31S5405 (from 6/88) * Spectra NS52 * AIRTEX / WELLS 5S1393
FJ CAS
rally1200: the FJ20 dissy has 2 outputs
1. 4 pulses per revolution
2. Reference lots of pulses (360?) per revolution (don’t use)
for my setup i had to drill a small hole in the optic plate to create a 5 pulse next to number 1 pulse (easily done)
Wheels
Nissan discs vary by CPS (inner ring).
* 4-2-2-2 wheel FJ, KA and E engines * 16-12-8-4 wheel: SR, CA18 engines * varying-slot wheel: Mitsu engines
16-12-8-4 wheel
http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/Dizzy001.jpg
4-2-2-2 (?) wheel S13 KA24DE vs SR20DE
http://i297.photobucket.com/albums/mm219/ddgonzal/wiki/20140529_142512.jpg
FJ20ET wheel has extra round holes
http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/Dizzy004.jpg
Circular Center hole wheel
http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/645195.jpg
Aftermarket low-resolution (GM pattern) wheel
http://i297.photobucket.com/albums/mm219/ddgonzal/wiki/24-2_wheel.jpg
"missing tooth" 12-1 at "crank" speed (24-2 wheel)
Mitsubishi Engines
4G63 sensor J918 - 1990-1994 Mitsubishi & 1992-1995 Hyundai Elantra
{{Photo!|IMG_5999.jpg}
1.8, 2.0 & 2.4 DOHC Sirius 4G6 engines
6G72 sensor 928 - notice the wheel has a different pattern from the 4-cylinder.
http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/ignctrl_cas1.jpg
CPS 'T1T49371 R' from Mitsubishi 3000 GT H Constant-pattern trigger wheels - similar to the Nissan wheel - are available from the aftermarket.
Information on using with MegaSquirt ECU. http://forums.turbobricks.com/showthread.php?t=224740
Red +12v Black Ground White Cam signal Yellow Crank signal
Using With A-series
E-series distributor with CASE can be used as a trigger for ECU-based electronic spark control and for Sequential fuel injection.
See D4P
CA or SR CAS can be custom-fitted to an old A-series distributor (and then Crank Trigger ignition will be required, since you no longer have a working distributor).
CA CAS grafted to A-series distributor
SR CAS can be modified to fit into the A-series distributor spot. See #SR section above.
Coil On Plug
Cam Angle Sensor is required for Coil-On-Plug ignition.
See main article: COP
Distributor-less Multi-coil ignition does not require CAS. See Crank Trigger
Control Box
Nissan
A stock Nissan ECU can be used with an A-series engine. Use it with all the stock Fuel Injection parts from the donor Nissan. For spark-only control, leave the injector harness unplugged. Custom spark maps cab be programmed.
MegaSquirt
MegaSquirt III supports Nissan Optical CAS, with the latest firmware download.
MegaSquirt 2 partially supports Nissan optical wheels, for use with ignition timing (support for spark maps and coil packs). For actual CAS portion, an aftermarket low-resolution wheel is required.
Nissan optical CAS/CPS unit can be used to trigger MegaSquirt ECU for electronic spark control of coil packs and for batchfire EFI. MegaSquirt III with the latest firmware download can use the stock Nissan trigger wheels to support sequential fuel injection and/or Coil-On-Plug.
See Main Article: COP
Aftermarket 50mm GM-pattern trigger wheel for Nissan CAS
- KA and SR engines
- Some SR uses 54mm wheel
- Some KA24E uses 54mm wheel
- Does not fit CA, RB or VG engine
Can also be used with MS-III, although the stock Nissan wheel works with MegaSquirt 3 now.
Haltech
Newer model Haltech ECUs supports Nissan Optical CAS.
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