Replacing R/R for better MPG?
I am looking to replace the OEM Shunt type R/R with series unit, and if my math correct depending on speed this should give me 3-13% MPG improvement?
OEM stator is rated at 35A (420w) and this is constant load due to shunt type R/R. The actual electric load is 190w less, which with series unit should reduce engine drag by 0.26hp. Per calculator depending on speed (35-65mph) road+aero load is 2-10.3hp, so the 1/4hp drag reduction should give ~3-13% improvements. Am I missing something? I suppose at lower speed the stator output will be less than max, so 13% is over-estimate. |
If we are talking about a generator system then minimum drag is when there is no current in the field windings or the armature is not moving. The core of the field coils will have some residual magnetism so there will be some slight output with the armature moving. A clutch on the armature shaft could control it such as used on an AC compressor though there would need to be enough current from a battery to engage it.
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Just remove the alternator, and install an exhaust driven turbine driving a generator.
Really, you don't need an alternator, are better off with a rotating exhaust turbine. |
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Back pressure trades top speed for torque, so your MPG should go up, as well as your acceleration.
As far as an exhaust driven turbine, powering an alternator, no one invented this yet. But if you want to ride alternator free, the exhaust is a good place to harvest the energy from. |
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It's a proven fact to increase torque and MPG. That's why many manufacturers do this especially for small bikes, and performance cars as well, using exhaust back pressure valves, or some form of restrictive exhaust can. |
I was talking about the exhaust-powered alternator, obviously.
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I think trying to disconnect an alternator, is just as unproven.
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