MoTeC Global Forum

As I understand CRIP, it is the angular distance in degrees (BTDC) from the first REF tooth (after the SYNC tooth lineup) to Cyl/Rotor #1 TDC.

Since the 12-tooth Mazda trigger wheel is mechanically linked without adjustment relative to the rotors, I ASSUME that CRIP values should be the same for ALL 13B-REW engines using the stock trigger wheels and mag sensors. The "Mazda 12 Tooth Mag on Crank" (Diagram T-1T) gives a CRIP of "20" for the '93+ rx-7's 13B-REW. However, I'm seeing a value closer to 10 (BTDC). Is this a mistake on my part or in the MoTeC diagram?

Can anyone please confirm this.

Many thanks,
Carlos

Are you reading the correct edge of the waveform?

Could the polarity of the mag sensor be reversed?

IDP: Thanks so much for your questions.

I've scope the trigger sensors as falling/falling which is in accordance with MoTeC diagram T15's (http://www.motec.com.au/filedownload.php/t15.pdf?docid=1284) recommendation of setting "rEF" mode at 14 (i.e. falling/falling) .

I guess the part I'm really confused about is why my physically measurements for #1 (rotor) TDC is so significantly off from the CRIp setting of "20" in diagram T-15 settings. Since the timing is not mechanically adjustable on 13B-REW rotaries, I'm trying to resolve why am I getting such a substantial difference from MOTEC's documented CRIP setting.

Turns out that my assumptions of how to find TDC on a 13B-REW were wrong. The MOTEC CRiP of 20 is correct. Don't I feel silly!