-->

Latest News

Thursday, March 28, 2019

Nissan Skyline Crank Angle Sensors : CAS


R34 CAS on the left, R32/R33 on the right

Nissan CAS or crank angle sensor is a crankshaft position sensor driven from the exhaust cam. The CAS sometimes accidentally called a cam angle sensor, has an optical wheel inside that is driven at 1/2 crank speed.  It has two sets of slots inside. One set is 360 one for each degree. The other set of slots is 6 or one for every 120 degrees of crank rotation. You will often see the signals labeled as the 1 and 120 signals.   The CAS allows you to adjust base ignition timing on an RB engine.    There are several different part's and part numbers for them.  There are Mitsubishi and Hitachi sensors.  There even a couple of shapes of the R32/R33 sensor.  The late R32, and early R33 sensors had a slightly different shape than the early R32, and R33 later sensors that were all the same.

RB26 Hitachi Crank Angle sensor.  
The Mitsubishi and Hitachi crank angle sensors are interchangeable between R32/R33 GT-R.  You don't have to replace them with the same sensor. Just the look is different.

Crank Angle Sensor Part Numbers

23731-02U11



R32 GT-R with timing anti tamper tape applied

Notice the drive on the R34 CAS on the left, and the R32/R33 on the left







Other options:


Other options involve not getting the crank position from the cam gear.  The problem with getting the reading at the cam is that the belt stretches and flexes a little bit.  Add in the wheel inside the CAS fluttering a little, and having 360 little, teeny, tiny slots, you can get some crank/ignition timing errors.  If you have a stock car, at stock power, the OEM CAS works fine. If you are making 1000 hp, turning 10,000 rpm, then you need to go to a crank pickup. 

With a crank pickup, you also need what is called a 1 signal. Since the crankshaft spins around 720 degrees, or two turns in every complete combustion cycle, the ECU needs to know when it is at top dead center (TDC) on #1 cylinder during the compression stroke, to fire the spark plug. 

In recent years, lots of companies have come up with kits to read the crank position.  Here are a few.


Nissan RB (Twin Cam) Crank/ Cam Trigger Kit from Ross Performance
Kit includes the following:
  • Nissan RB Harmonic Damper with 12 or 36-2 Tooth Integrated Trigger Disc
  • Nissan RB Crank Angle Sensor Mount (306000-75) OR Nissan RB Crank Angle Sensor Mount to Suit Girdle (306000-75-SP1) SP1 mounting spigots are 10mm shorter than standard.
  • Nissan RB Cam Angle Sensor Mount (306000-74)
  • Nissan RB Twin Cam Trigger (306000-73)
  • Honeywell GT101 Hall Effect Sensors (992GT101) OR Cherry Hall Effect Sensors (992CHERRY)
This Kit is designed to suit the following engines; Nissan RB20DET, Nissan RB25 NEO, Nissan RB25 R33, Nissan RB26 R32 GTR, Nissan RB26 R33 GTR and Nissan RB26 R34 GTR






Buy USA Legal R32 and R33 Skylines at Importavehicle.com!
Buy-R.com for Nissan Skyline GT-R and GT-R parts.




No comments: