December 02">


December 02, 2000

OK. Finished w/ power commander 2 on this RC51.


Supplied map for TBR exhaust is rough cruising and has lean spot at full throttle at 6000 rpm that cannot be fixed with the power commander. Mixture problem immediately obvious on the EC997 with integrated 4 Gas EGA.

AP Table:
Maximum + change value is only +9. Or, if you are used to integrated EGA dynos, less than 2/3 of 1 main jet size possible enrichening at full throttle.

MMP Table:
Manifold pressure changes: Software allowed changes in Manifold pressure signal. Virtually no mixture changes when modified. Was not able to record ANY changes in 4 Gas EGA readings or engine smoothness (the LAST word in mixture selection) when doing changes to the MMP Table.

Ignition Timing Map:
Ignition map - NOT even modified at all with "special TBR map"! Modified ignition map and improved part throttle power.

Tuning Issues:
Low speed / cruise mixture was poorly mapped and in the wrong direction on this bike. Even when tweaked as far as possible in the correct direction, there's still not enough range of change available. That explains roughish cruise with TBR exhaust on this bike.

Full throttle:
Not enough range in pc2 for proper tuning. The pc was unable to isolate a 1000 rpm wide spot, and any changes made at that  rpm point overly affected the neighboring rpm ranges.

Part throttle:
Not enough range to correct the lean surge with TBR exhaust. Cruise still poor.

Ignition rpm scatter issue - pc2 introduced ignition timing scatter into signal. Ignition timing scatter reduced power.

Conclusions - poor map supplied for TBR exhaust and insufficient range in pc2 for acceptable tuning on the RC-51.

Note: This information, including ignition mapping, took a total of 2 hours and a standard EC997 dyno with integrated 4 Gas EGA. All the mapping tests were loaded step tests at steady rpm. Sweep tests delivered little useful information for mapping.

Other dyno companies have had virtually unlimited time to deliver a better map with their "model 250", but failed.





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Maybe in next rewrite, he'll fix the ignition timing and dyno chapters...
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