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

  ____  
 |  _ \ 
 | |_) |
 |  _ < 
 | |_) |
 |____/ 
        
        

 _______ 
(_____  )
     /'/'
   /'/'  
 /'/'___ 
(_______)
         
         

 _______ 
(  ___  )
| (   ) |
| |   | |
| |   | |
| | /\| |
| (_\ \ |
(____\/_)
         

 _______ 
(  ____ )
| (    )|
| (____)|
|     __)
| (\ (   
| ) \ \__
|/   \__/
         

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:
The old v3 was very non-standard. Originally low voltage flyback. ~10 Ohm injectors so the replacement ECU has 30V flyback which is better. '''But you need to increase VE table especially at low kPA to get appr +500 usec longer pulsewidth'''. Without tuning the VE table the engine can be lean, undrivable, and misfire. The USB-RS232 can indicate misfire by disconnecting. '''solution: Increase fuel pulsewidth''' You can get an idea of the direction of required changes: * in the VE-table we increased the lowest-kPa row by +32, than gradually only +24, +16, +8, +4, +2... import VE table by saving [http://www.vems.hu/files/MembersPage/SalyiBmw/v3.3_n000816-A-2013.07.17-16.37.27_modified_higherVE.vemscfg this vemscfg] to disk and dragging over the VemsTune VE table (VE tuning) ** this is just very approximate, to show the direction of changes, the engine must be fine-tuned for proper lambda 0.96 .. 1.00 at low load (that's why the wideband lambda sensor is installed) * and in "Engine setup" dialog increase req_fuel slightly (eg from 3.0 to 3.1 msec) Alternatively, in injector settings "injector opening" can be increased (eg. from 208 to 720 usec). See tutorial videos under [http://vems.hu/vt/ vems.hu/vt].
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.