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IMPORTANT: enter the case-INsensitive alphabetic (no numbers) code AND WRITE SOME SHORT summary of changes (below) if you are saving changes. (not required for previewing changes). Wiki-spamming is not tolerated, will be removed, so it does NOT even show up in history. Spammers go away now. Visit Preferences to set your user name Summary of change: This page is to help with setting up the Primary Trigger option Specifically for the VAG 60-2 wheel, but it will contain general information ----- MegaTune is an easy way to setup the trigger values, but you need to know what you are changing. ''current decimal values'' ||'''Primary Trigger'''|| GRM setup || Mcel || || Edge || Rising || Rising || || Type || Multitooth ||Multitooth || || Filtering || Disabled ||Disabled || || Tooth Relation (Usually Disabled) || Disabled || Disabled || ||'''Trigger Settings'''|| || TDC after trigger (degrees) || 60.0 || 60.0 || VAG wheel on ABA block is 90d off TDC at the center of the missing teeth via calibrated eyeball|| || Number of teeth on wheel || 58 || 58 ||actual nubs || || Trigger Tooth || 3 || 15 ||The third nub after the space ''actually the missing ones are counted, 3= the first after the space''|| VAG ABA wheel appears to have the center of the missing teeth @ 90d off TDC, would this make this value 2|| || Next Trigger Tooth || 15 (V8)/20 4clyn || 15 || Manual states NextTrigTooth= imaginary teeth * 2 / cylinders (60 *2 / 4 = 30) || || Crank minimum period (usec) || 1280 || 1280 || ||'''Tooth Width'''|| || Angular width of tooth || 2 || 2 ||'''shouldnt this be 360/(# of teeth + missing teeth 360/60 = 6''' No, fake degrees, 720/240=3-> 6/3=2|| || This part needs to be made either transparent to the end user or extremely well explained with a shortcut on howto do it. || || Tooth Relation to Normal (usually 181) || 181 ||181 || || Tooth Relation to Missing (usually 118) ||118 ||118 || ||'''Phase'''|| || Angular width of missing tooth ||6 || 6|| ( shouldn't this be 12) ''actually 18, but in fake degrees it's 18/3=6''|| || Engine Phase, when reset||240||240|| ------------- These are all you settings, but these are not normally how motorheads describe thier motors or triggers. '''Typical Descriptions''' * TDC -- Regular meaning when #1 cylinder is at top of rotation * Number of actual teeth on wheel * Number of missing teeth on blank spot on wheel if there were teeth there * Relation of blank spot to TDC this would be in degrees ** Leading edge angle from TDC ** Trailing edge angle from TDC So using these values how do we get the other ones. ------------- '''Suggestion''' Do the number trunkation etc in the make mtt portion. Most NON - EE/CompEE/CS engineers will not get the howto about converting decimals to an arbitrary (seemingly) number less than 255 ( 8-bit micro unsigned issue)... So basically a good picture and straightforward equation, IF it is not automagically done for the config.. Optional: Add document to category: Wiki formatting: * is Bullet list ** Bullet list subentry ... '''Bold''', ---- is horizontal ruler, <code> preformatted text... </code> See wiki editing HELP for tables and other formatting tips and tricks.