GEMS - General Engine Management Systems Ltd - Forum

I'm in the process of starting some maps for a 2.0l black top zetec for an EM36. Engine is using the standard ford crank (36-1) and cam (single pip) triggers.

In the EM36 documentation it gives an example for the ford 36-1 trigger which specifies the "Tooth Control table is repeating 1,0,0,1, till 30 then 4,4,5,4,3". Based on the explanation of the tooth table values this doesn't seem to make any sense.

An example map I've got (ford4 rsa1) has a pattern of 5,4,4,5,4,4,5,4,4 etc until 3 at index 35. This seems to make more sense but it would be nice to have some confirmation of that!

Also, as I understand it the tooth counts (A Tooth) should count from the missing tooth, this is then scaled down to the I Tooth and F Tooth values by the Tooth Control table. Therefore, the values entered into IGNx Tooth values are dependent on the TDC->missing tooth measurement. To save me ripping the flywheel off (again!) does anybody know what this is for a Zetec?

cheers
ian

Hi,

Generally you will get a much better sync with 1,0,0,1. This is the format we use alot as it strains the processor less. 4,4,5,4,3 will give you a good sync as well. If you have a 36-1 the missing tooth is 1. The fuel and ign teeth should be 12 however the fuel and ignx teeth are used over an engine cycle so they are over 24 teeth. They obviously determine the firing order so should be 6 teeth apart from each other. (0,6,12,18,24) as you probably know.

I hope this answers your questions?
Ed

hi Ed,

Ok, I think I understand the processor loading issue although potentially the 1/0 solution could take longer to sync on initial cranking. However, i still can't get my head around the repeated 1,0,0,1? Surely it should be 1,0,0,1,0,0,1,0,0,1,0,0,1,0,0,1,0,0,1,0,0,1,0,0,1,0,0,1,0,0,1,4,4,5,4,3 ?

thanks
ian

Hi

Sorry i wasn't being clear thats exactly the control table you need with the first 1 being on the 0 tooth. Make sure the option 'test not sync'd' is on as well and your sync should work. In order to monitor if your sync is working whilst cranking look at the parameters:

Mx Tooth No: should be 34 whilst cranking.
Timing error: you should only have one or 2 at the beginning of syncronisation and no more counting up.
Stat Sync'd: should be on whilst cranking.

Hope this helps
Ed

hi Ed,

That makes sense now.

Thanks for the diagnostics advice - I'm sure it'll be usefull!

cheers
ian