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lol turbine speeds. well all i was saying is that 90% of my driving is in 6th gear going fast.. atleast this whole last year was.. but ok lets say. 1980 chevy truck alternator..the alt pulley is 2.5" diameter, and the crank pulley is 7.75"..... considering alot of people are running axle driven alternators.. i find it hard to believe i would need a 30+ inch pulley.. lol
the only reason i was talking about engine rpms... is so i could calculate my axle rpms while im driving..
That's what I've been telling him but it's not sinking in I guess.
You can figure it however you want, but if you are driving anything off the axle then figuring axle RPMs from tire dia and mph is the best way. If you were running the alternator off the crank, then engine RPMs would be the best way.As Fabr said, "it requires less calculations" and will give you the full picture from dead stop to top speed. Axle RPM and MPH directly correspond to each other. Axle RPM and engine RPMs do not. (that should be reason enough right there)I personally would figure out how fast you can safely spin the alternator and then so do the calcs so that you achieve that RPM at the buggies top speed. I would do that to prevent damage to the alternator. Maybe even give yourself a little head room. I haven't looked it up, but I have a feeling that would give you a decent charging rate from moderate to slow speeds and up. Plus matching the upper limit of components just make good sense, but don't let good sense interfere with doing things the way you want. Why is it that you started this thread again?