InputTrigger/SubaruThirtySixMinusTwoMinusTwoMinusTwo (2010-06-15 16:48:51)

Because of contradiction between information from the same Subaru manual, start with

Cam info. This helps to decide what is more likely around the crank.

There is a camsync pulse 45 crank degrees before Cyl 1 TDC, then the second comes 135 crank degrees after TDC

Camsync:

subaru2001-camwheel.jpg

The relative position of the cam (having the camsync pulse coming inside the middle of the long gap) was a reasonable decision.

Now this crank arrangement makes more sense than the contradicting other:

subaru2001-crankwheel.jpg

crankwheel1modi.jpg

just tell me the direction of rotation ! clockwise or counterclockwise ? Consider

The timeline on the drawing above and below are contradictory and this information is needed.

Our implementation assumed the above photographed wheel rotates COUNTERCLOCKWISE so the double long gap is followed by 13 tooth, not 16.

If anyone scopes the real thing please write here: ....

Crank Sensor pattern:

subaru2001-crankwheelpic.jpg

The choice to have the long gap detected at 30 BTDC and 0 TDC is weird.

On both pics with the wheel, it turns anti-clockwise. The engine runs clockwise, but the pic is of the back of the wheel.

We can look at it as 15+3,3+12+3


Subaru 36-2-2-2 implemented with camsync: derived from c012

Than burn, and might need to reboot.

Please measure+figure how to set trigger tooth and TDCdelay.

(tooth 0 is after the long gap after the group of 16 normal tooth).


Test pattern

Here is a [wav file] (with CamSync. Inverted to play properly. 670 RPM ?)

Of course, it would be wise to scope the real thing.

Here is a [vemscfg file] of the setup described above (trigger settings)

In Jason's engine there is the possibility of using a 4-1 cam signal. It's for the 2004 WRX STi variable cam system (disabled on this engine for now) and those sensors are still there but unused. We should figure out the 2 pulse camsync, but if the 4-1 is easier to handle quickly, I'm ok with that. There is a 4-1 on each cam, but I expect it's sufficient to just read one of the two (just like this 2 pulse cam trigger).