I am installing the Andrews 57H cams and +4 degree cam drive sprocket in my 2012 FLHTK. Which is best to flash the ECM with, a MAP that has slightly differnet exhaust and same cams or the SERPT SE204 MAP witch is about the same as the opening and closings of the 57H intake and exhaust events but lower lift and slightly different exhaust. I ask because I am wondering which effects the tune most, the spark advance differences in the maps or the open/closing events that are basically the same. Thanks in advance for any and all help.

 

The 204 map should be a good place to start as the cam has almost identical specs to the 57h advanced 4*. Are you saying that you have a map for the 57h as well? I found that the spark advance tables were too aggressive on the SE 204 map and had to pull timing in a few areas before my bike ran smooth when I still had 204's.

 

Yes I do have a map for the 57h's and and the SE204 map does have more timing then the 57h map. So if you had to pull timing it might be best if I went with the 57h map I have.