Production of a BHP graph starts by clicking one of the red buttons (probably 
); this will run the calculations and produce a table of data.
The above image shows that the rev range was defaulted at 2000 to 8000 RPM (from Test Setup). Any performance graphs produced will be based on the range displayed at the top of the Engine Performance Table.
The above shows the graph produced using defaults (just click the View button). The rev range uses only half the X-axis, and the Y-axis range is also only partially used.
The image above shows the graph re-scaled to halve (0.5) the X-axis and decrease the Y-axis by a factor of 0.4. (Then click the View button).
Changing the rev range in the Engine Performance Table may modify the number of steps in the rev range, but may also cause problems.
Change the Max Revs to 9000 and click on the number.
The above message is caused by ICE calculating a negative BHP - in the virtual world of ICE a negative BHP can result from excessive RPM. The window below shows the output table, with Max RPM values amended by ICE to the highest value that does not go negative.
8,500 RPM is the highest (with a 500 step) that works.
The above Graph shows the new RPM range. The last value on the X-axis is just short of 8,500. The plot will disappear off the bottom (go negative) at about 8,700.
Changing the step increment (200, 500, or 1000) will not change the resolution of the plot, but might reduce the RPM range plotted.
To examine a particular part of the BHP curve modify the rev range on the Performance Table (in this case it was changed to 3,000 - 6,000) and re-plot the graph.
The X-axis scale has been scaled by a factor of 0.3 and the Y by 0.4. Peak BHP is at about 5,000 RPM. This is confirmed by the data in the Performance Table. Notice the RPM Step has been changed to 200 to increase the resolution of the data.
