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Submitted by: Dan Kyle

  • The PC is designed to be used with the Dynojet 250 dyno.
  • The 250 dyno is used for making the maps for the PC.
  • The 250 dyno has an eddy current load adaptor and an Air/Fuel ratio sensor.
  • There are two ways of making maps, for now let's skip the older method and go straight to the easiest most current.
    • "Tuning Link"
      • The Tuning link software makes making a map much faster and is very accurate.
        (I should point out that the exhaust air recirulation,(Pair Valves) must be blocked off.)
      • First set the software to the air/fuel ratio you want the bike to be at 3 different RPM/Throttle position blocks, for the sake of this discussion lets just say at all throttle postions and RPM's we want it at 12.5 to 1, that is 12.5 parts air to one part fuel.
      • Next we pick a starting point usally 1000 RPM 0% throttle.
      • The tuning link software will measure the air/fuel ratio, change the map, recheck, and tell you to go to the next throttle position, those are 0%, 2%, 5%, 10%, 20%, 40%, 60%, 80%, and 100%. as the operator changes and holds each throttle position the software adjusts and rechecks the Air/fuel ratio, and in real time alters the fuel map. The dyno uses the eddy current load cell to hold the bikes engine at each RPM position. You repeat this for each RPM block, 1000, 1500, 2000, 2500, 3000, 3500, up to redline.
      • It is very, very important to maintain a constant water temp, usally as close to 180 degrees as possible, a change of 15 degrees is about the max allowable.
      • The numbers in the map indicate richer or leaner than the stock map, the stock map would be unchanged if all the numbers are zero.
      • Now how much of a change is each number??
      • If you measure the A/F ratio as 13.0 and you want it 12.5, a "5" would be inserted, this richens the mixture, if the measured A/F is 11.0 a "-15" would lean it out to 12.5. So "10" is equal to 1.0 A/F ratio and "1" is a .1 change in A/F ratio.
 

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Very good explanation !!!!! I was looking for this information and its not easy to find someone who knows this PC-III table... It will help me a lot !!!!

I´m thinking to buy a wide band commander for help me to make a personal map myself. I´m not happy with the map that my mechanic did and I belive the engine is running riched. At 5000rpm and about 15% throttle the map has a 15 on the PC-III map and the consumption is very very high. I´m thinking how could I improve the comsumption with no damage, so I need to check A/F rate with any kind of device... So wide band could help me...

Thanks !!!!!!!!!!!!!!!!!!!
 
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