twin cam trigger kit??? whats this?

[GT-RJules]

what is this thing its made by ross tuffbond i would imagine it just gives the ecu more information on what the motors doing? anyone know a build that uses one and how it affected them?

http://blog.rossperformanceparts.com...m-trigger-kit/

[speed]

X2, id like to know for myself!

[GTRADDICT]

I think its to replace stock CAS

[Super_Dude]

The timing belt throws of the cas and what the cas sees as crank position isn't accurate and jumps around a lot.

This kit let's the ecu see exactly where crank position is and the tuner can safely add more timing and make more power.

[collector240sx]

If you do a search for AEM r26 cas trigger disc, you should come up with some info about the problem getting good reading of the cam position on aftermarket ECU, some more affected then others.

[Skym]

As far as I know, both are a hall effect sensors (square signal on oscillioscope). I think crankshaft sensor is for ignition timing and the cam sensor is for timing of injectors (need both on a RB engine).

Stock CAS (Cam Angle Sensor) is looking at where valves would be open, closed, so ECU knows when to fire spark plug, inject fuel. Inside stock CAS it has window shape looking holes on inner (closest to shaft) of timing disc for I think was injector timing and 360 tiny slit like slots on outer of timing disc for ignition timing that light is put through on one side of timing disc by a optical sensor and picked up by optical sensor on other side. Loose cambelt can cause stock CAS to give inaccurate signals due to backwards, forwards movement of camgear (I think the sudden changes in ignition timing to raise or lower revs + loose cambelt makes camgears go backwards, forwards and signal scatters) hence the scattering. Stock CAS optical sensor has a curvy looking signal on oscillioscope.

Aftermarket ECU has settings that allow you to trigger at the high or low part of both signals (I think they are the rising, falling edge settings), etc.

[collector240sx]

One of the problems with the CAS is that it's linked to the crank by a BELT. The belt is NOT a solid materiel, it's a durable one, and very effective one, but it does stretch and contract. That stretch and contraction from my understanding can cause a timing drift, not really a problem on a stock engine at stock power level, but when you start extracting power, and advancing the timing this can become a problem. You want to have solid consistent reading or else you have to concede power in order to account for a safety margin.

Timing is really important, for example in a real high horsepower car (2k-3k hp) they actually have to take into consideration the stress of the crankshaft during acceleration.

BTW Do you know how much they go for, haven't come across any price on them yet.

[GT-RJules]

thanks for the knowledge on that guys, i believe they go for around $900.