Thread: 54mm CAS ....

WTF how in the world did you get that so fast man? Please let me know where to call and who to talk to so I can get myself one.

Bump this up. I think this is so wrong that they sent me the 50mm CAS disc thats for the RWD SR20's with my FWD EMS and now they start making the right size 54mm CAS disc they want me to pay freaking $25 for the correct one man!?!? That sucks.

This is quite the exciting development. Looks similar to the one I designed. =]

If I were to do it again, I'd have designed it like their 50mm disc so there was no difference when you installed it one side out versus the other side out.

OMG i need one!!!!!!

Call them and get one.

ok so what is so special about this 54mm disc that AEM is selling vs using the stock one.

Also

I see people saying they make it for the GTI-R and not sure if it will work. The GTIR runs the same Dist as a B13 SER.


I wonder if the SR20VE 20V CAS is the same size as the RWD SR20DET

24 holes vs 360 holes and it works with the aem ems...

right now my car is on the dyno and it wont cleanly rev past 4k with the oem cas disc...

The AEM EMS (and a handful of other EMS) sometimes have a hard time interpreting 180 signals from the CAS every engine rotation. It's simply a lot of data to process. The stock ECU is designed to handle it. Many aftermarket ECUs are not. To solve this problem discs are made with fewer slots (24 in this case versus 360). The fewer slots give less accuracy and slower CAS sync which can make start-up after cranking take fractions of a second longer (the loss of accuracy is almost of no concern) but allows the ECU to deal with much less data.

Because of the data overload often you will have problems with ignition at heavy loads, certain rpm, or other crazy places.

At some point (I think during the transition from B13 to B14s and from P10s to P11s) Nissan changed the CAS from the 54mm early design to the 50mm later design on the FWD engines. The RWD engines all seemed to get the 50mm design from the S13 on up. The 50mm RWD CAS discs will physically install into a later-model FWD distributor but the inner 4 slots are likely not the same length (they weren't in my case) and will probably cause problems on a stock ECU. I would imagine the 20V has the same 50mm CAS as all the others, but it's inner 4 slots might be specific to that engine. I wouldn't know.