Quote:
Originally Posted by bestclimb
Looking at that torque curve you get up to speed fastest (least time spent accelerating) around 3800-4200 rpm with a nice little secondary dip in BSFC. I tend to prefer a quickish acceleration (If there is not much of a fuel economy hit).
As for steady state cruising (lightly loaded) some sort of instant fuel economy info will give you better data than a graph depicting a fairly heavily loaded engine.
One thing that may help is a cam reground for low end torque but the cost would likely eat fuel savings.
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So basically when accelerating, I should try to accelerate at around 4k RPMs. This has two benefits: best BSFC as well as get up to speed faster so I can than cruise. My question though is the BSFC is in g/kWh, not necessarily MPG, so the engine may pollute the least at 4k, but not necessarily be the most efficient in fuel used?
If one was to research a cam reground for economy use rather than street racing use, what would one be looking for?
Quote:
Originally Posted by Occasionally6
What is needed for a BSFC map is the BSFC figures corresponding to power outputs at a range of manifold pressures and rpm. You might generate that by holding the inlet manifold pressure constant, at a number of different pressures, and generating similar curves to those above for each pressure. They can be then be displayed together in the form of 3D maps; manifold pressure vs rpm vs BSFC and manifold pressure vs rpm vs torque. Power is, simplistically, torque X rpm.
Because a given power output can be obtained at more than one combination of manifold pressure (~ throttle opening) and rpm, that map allows you to pick the most efficient combination from the load vs rpm points at which the power you want/need can be generated.
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Could this be done with an Arduino and tapping into the ECM?
