Cam Sync on Zetec VCT

[hardline]

I am still looking into investing into an MS3 unit, but I have a couple of hurdles to overcome first. My biggest one, and the one I cannot find an answer to is whether the MS3 can use a 4+1 cam wheel for cam sync for Variable Cam Timing, and also be able to run COP and Sequential injection.

[jsmcortina]

Not yet no, but it could do.

However, in order to get support for the 4-1 cam wheel I need full timing diagrams for it or a "recording" of the crank/cam tooth patterns from the Megasquirt composite tooth logger.

James

[hardline]

OK, I can try and get measurements. On the cam, there is a tooth every 90 degrees, plus an additional tooth about halfway between two of the 90 degree teeth for sync for Sequential injection.



Borrowed this image thanks to Google

[jsmcortina]

That's a start, but what is needed is the exact phasing. Ideally draw up a timing wheel for the crank and rotate the engine through 720 degrees by hand and plot out when the cam teeth pass the cam sensor.

James

[hardline]

Please forgive the crudeness of the scope output, but here is the outputs of the cam and crank sensors.

Cam Wheel 4+1 (yes that is a Plus)
Crank Wheel 36-1



The Green trace is the Cam Sensor, the Red trace is the Crank Sensor.

[Mike]

bump

Was there a solution for the zetec 4+1 cam position sensor? I'm also running this engine and just finished installing a MS3X system. Initial settings are all in and I just did the cam/crank position logging. Below is my composite log and rough diagram of the cam position sensor at cylinder 1 tdc.

[jsmcortina]

Please post the raw composite logs taken from "log crank and cam" mode and I'll see what I can do for alpha13.

James

[Mike]

Thank you. Is the attached file what you were referring to? I couldn't find the 'log crank and cam' mode. this log was generated in tunerstudio under diagnostics, composite logger.



In case no software solution can be found, could i grind off 4 of the 5 pegs? this would leave a single pulse 180 crank degrees before cyl 1 tdc, as per the below diagram.

[VolvoGuy50]

Thank you. Is the attached file what you were referring to? I couldn't find the 'log crank and cam' mode. this log was generated in tunerstudio under diagnostics, composite logger.

It's in ignition options. Where you select toothed wheel, basic trigger, etc.. It's an option in that drop down.

In case no software solution can be found, could i grind off 4 of the 5 pegs? this would leave a single pulse 180 crank degrees before cyl 1 tdc, as per the below diagram.

Yes, that would work.

[jsmcortina]

Can you confirm if the cam sensor is hall/gear-tooth or VR ? The pulses you have recorded seem quite wide and hall-like. That will impact how the decoder is written.

Something seems strange with your crank sensor though - I'm not seeing a missing tooth?

James

[Mike]

Sorry for the dealy, I've been out of the country. Thank you for the help. Hopefully I wont have to grind into my camshaft! I ran another log while using the 'log crank and cam' setting. please find it attached.

The cam sensor has 2 wires, one to ground. that makes it VR, correct? My crank sensor is the factory zetec wheel on the flywheel. 36-1, 80 degrees. The engine was running well with the factory computer when it was removed. I kept the factory harness and built a EEC-V adapter to the MS3X. Is thre something wrong? Thanks again.

[jsmcortina]

Did you Burn and powercycle after selecting "log crank and cam" before starting the comp log.? The log should show rising and falling edges of the input signal instead of a rising or falling edge. However, you log isn't showing that.

James

[Mike]

Apologies, please find attached a new log file. You were correct, I don’t think I power-cycled. Thank you for your assistance and patience.

oops, the new log is too large. please find it here (comp log 3.csv):
http://people.ucalgary.ca/~mofogwil/Megasquirt/

[jsmcortina]

I have some test code working on the bench. You need to change you input capture edge to obtain the correct crank tooth pattern.

James

[Mike]

I have some test code working on the bench.

Excellent. Thanks. How do we proceed from here?

You need to change you input capture edge to obtain the correct crank tooth pattern.

Its currently set to falling edge as shown below. Should I change it to rising edge? How do the remainder of my settings look for a sequential setup with COPs.

Please let me know if there is anything else I need to log for you. Thanks again.

[jsmcortina]

You'll need the alpha test code, I'll send you an email.

James

[Mike]

thanks for the code. i followed your instructions and everything went well. the new firmware communicated with TS, i got a stable cranking RPM, i verified the spark angle and tried to start it up. it fired, revved up to 2500rpm and promptly died. Sound like its working! time to mess with the ASE values. please let me know if you require any more information/data logs.

[jsmcortina]

The key things you need to check are that you are retaining rpm and not getting sync loss (take datalogs and check the lost sync counter.) Also ensure that your timing is stable and always matches the commanded timing.

James

[Mike]

From the first datalog, there were no sync loss events in the ~3-4s of run time. also, the logged spark angle was right where it shoud be on the table. ive attached the log.

[jsmcortina]

Do strobe the timing as well.

James