####   
 #    #  
 ######  
 #       
  ####   
         

         
### ##   
 ### ##  
 ##  ##  
 ##  ##  
 ### ##  
 ## ##   
###      

         
         
  ### #  
 #   ##  
 #   ##  
  ### #  
      #  
      #  

         
         
 ##  ##  
 ##  ##  
 ##  ##  
  ####   
   ##    
         

         
         
  #####  
 ##      
  #####  
      ## 
 ######  
         

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:
With '''increasing MAT, ignition retard is desirable to avoid detonation'''. Unfortunately it takes extreme effort to finetune ignition for a wide range of manifold temps, you need * a climate chamber (5M EUR) * or half year for this * though somewhat useful results can be obtained in half day if temp difference is at least 40C * or you can heat the charge cooler with gas-burner, or change airflow (fan), or swap it or do other tricks to change MAT during a dyno session Therefore almost noone finetunes for a wide temprange. If you fine-tune your engine, please share your experience (measurement results) here. Until than, best-breed experience suggests that marginal retard is needed below 40C, and above 50..60C the retard must be considerable. Since 2006-11-30 1.1.1 and 1.0.65 firmware, these retard curves are wired in: http://www.vems.hu/manual/html/images/MAT/MATretard_C.png The same in Fahrenheit: http://www.vems.hu/manual/html/images/MAT/MATretard_F.gif That means a '''few degrees subtracted from the base ignition advance curve'''. Note that there are other adjustments, like knock-retard, idle-ignadv retard/advance. If your measurements are different (say, at least +-1 degree change in base timing needed at different temps), we'll make it configurable immediately for you. Until someone uses it, there is no reason to have another config (just another chance to get something wrong). ** The timing displayed in the dashboard and datalogs is the actual timing (you do NOT need to subtract this MAT retard) ---- See also * GenBoard/Manual
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.