Jerky IGN

contectr · Post by **contectr** » Wed Apr 21, 2010 3:45 pm

Hi Hondata, i have a problem with my K20a2 JRSC at 10 psi, tsx 06 intake cam, race header, 650 cc and KPRO PRA ECU.
When i drive on low cam with part throttle, the engine have a little bug of power. I have datalog it and all it's ok but i see the IGN don't follow the Kal and go up and down. For example in kal are 11° and in the datalog go to 1° and next to 9°...Why?
About 1 month ago i don't have this problem and the only change is the Kamanger version
i post datalog and kal

Post by **Hondata** » Thu Apr 22, 2010 7:36 am

I think the ignition is retarding because of IAT compensation. Try making both IAT retards the same and see if that helps.

You should also not check 'disable P0135' unless there is no primary oxygen sensor.

contectr · Post by **contectr** » Thu Apr 22, 2010 7:54 am

Hondata, thanks for the reply,
For the primary oxygen sensor i use the Plx devices narrowband signal and i disable the P0135 because i don't have the stock honda primary oxygen sensor wired.

Hondata, if you zoom a big the datalog and see the RPM signal and IGN signal, you can see the RPM are not good, a little jerky..possible the ecu lost the rpm signal and change the IGN???

I have think about is possible the IAT compensation work a lot because i have the IAT sensor in the manifold and the IAT now is normally at 70 °C. In the table i have a 10.75 retard with 80°C IAT..
This value 10.75 are °IGN or a % of IGN??

contectr · Post by **contectr** » Thu Apr 22, 2010 3:52 pm

Hondata, i have try with only a value of 2 in the Retard IAT compensation 80°C,,,the car are better, but not the best. The IGN have a little jerky..
see the datalog, when i open the throttle they go at 6° of IGN and next to 9°C..