MoTeC Global Forum

How do we get the M4 to learn TDC -on M4 new Race car set up
60 tooth wheel minus 2 - Hall effect csm sensor -mag wheel sensor
Any help would be great - I feel the need for speed -

thanks for all input -and never trust a shop who cant make a car last more than 3 laps

I thought you were following my other thread to get your answer. We both have a 60-2 mag ref and hall sync. I used mode # 73. The 7 part means a 60-2 and single sync signal. The 3 part means falling/rising sensors, it's documented in the F1 help section but it's a multi level F1 help menu so you could miss it.

Next step is to set your crip to tell the M4 where TDC is. Start with the approximate angle from the missing teeth to TDC and then use a timing light to set the final crip number with the crip testing page. Add 360° to the number if you suspect you're firing on the wrong cycle. My missing teeth are 61° from TDC, the crip is 421°.

Does that help?

This is what I needed to Get -My wrench (mike) understands the lingo and is now confidant to move forward and
fire it up -Thank you - We are both learning what a fantastic system this is -This 968 turbo -9 to 1 sleeved block
ported head -t-66 turbonetics turbo-4 cyl -dry sump -trans axel -2500 lb -1440 CFM intercooler -twin radiator -twin oilcooler -has been a head gasket nightmare -runnning at Road america and other big tracks -

You need to set the CRIP from the missing tooth event that happens straight after the sync tooth. the sync tooth is there to decide which time the ECU needs to take notice of the missing teeth. If the engine has a distributor or is wasted spark you could be running 360 out of phase and not really notice.

Start with the engine wound over to the sync sensor. Next wind it forward to the next time the missing teeth come up....you CRIP is from this point back to TDC Compression number 1 in the running direction.

Go to the downloads section and install the old Interpreter program (do not use this program though). Once it is installed go to C:\Program Files\MoTeC\Utilities\Trigger Modes and open the MoTeC ref/sync program. It is not a finished product but works well enough to give you an explanation of what is going on.