__   __
\ \ / /
 \ V / 
  \ /  
  | |  
  \_/  
       
       

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

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

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

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

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:
It is very easy to calculate dRPM / dt, which is proportionate to torque. However, when doing tuning runs, you want to be able to compare the result after changes (like changes in ignadv). Analyzing the logged runs, in RPM-bins, in a similar way as lambda, VE and ignadvn is tuned is very helpful. Something like this (except for real data, and colored nicely): ||'''RPM'''||'''3000'''||'''3500'''||'''4000'''|| || MAP || 110 || 140 || 170 || ||ignadv || 24|| 25 || 27 || ||EGT(C)|| 552 || 603 || 612 || ||lambda || 0.82||0.81 || 0.8 || ||torque dRPM/dt || 1600 || 3100 || 3900 || ---- '''RPM => power calculation''' is very simple Some of the input parameters are often estimated though (a well known such parameter: m=mass, you can measure that too, of course) * P=F*v * F=m* (dv/dt + anull) + Fnull ** where anull = g*slopepercent (like g*0.04 for a 4% slope to keep the car climbing without deceleration) ** Fnull = some force to keep the car running without decel even on a 0 slope. Fnull=500N means that 500N * 20m/s = 10kW sounds reasonable below 100km/h (at high speed this climbs as v**2, due to air drag) * so P=v* (m* (dv/dt+anull) + Fnull) * v = RPM * const ** where, with audi in gear2: const = 1/2.13/4.11 * wheel_circumference ** wheel_circumference=1.87m (if you measure diameter and calculate 0.6m * pi, you get 1.885m, but remember the tyre is somewhat pressed in) ** so the '''audi wheelspeed at 7000 RPM and gear2''': 7000 / 60 /2.13/4.11 * 1.87 = 24.9 m/s = '''89.7 km/h'''
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.