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.
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.
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
Ignition Timing Map:
Ignition map - NOT even modified at all with "special TBR map"! Modified ignition map and improved part throttle power.
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.
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.
Not enough range to correct the lean surge with TBR exhaust. Cruise still
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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Edited to the tunes of Chemical Residue by Herbie Hancock.
Maybe in next rewrite, he'll fix the ignition timing
and dyno chapters...
Otherwise great book with great starting ideas.
The little blue bible for quick references and little