Quote:
Originally Posted by JRMichler
To help interpret Vekke's graph:
If you need 7.5 hp (5.6 kW) at a particular speed, the best gear ratio is that which has the engine running about 1400 RPM at that speed.
If you need 15 hp (11.2 kW) at a particular speed, the best gear ratio is that which has the engine running about 2000 RPM at that speed.
If you need 60 hp (45 kW), you don't have a choice. You only get that much power at about 4600 RPM. But if you keep the gas pedal on the floor, and change gears to get 3300 RPM, the power drops slightly to about 56 hp and the specific fuel consumption improves from about 250 to 222 g/kWh. That's 13% better (more efficient) use of the fuel.
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5,6 kW was correct in my opinion
For the 11,2kW I would say the optimal rpm is that 1800 RPM? but in general you have also take into account how many gear you will have at speeds you are using the most. I am trying to optimise my gears for highway use meaning 62-100 MPH cruising speeds. That means tallest gear ratios are always better.
For 45kW I have plenty of options in my car as there will be 89 kW+ available in the first stage. But with stock engine BSFC map that this is there is not much choices.