| Author | Message | ||
     Tbowdre |
Got my bike back yesterday with a new stator, I placed another ground on my regulator and will test it today with Erik Buell Racing ECM. Whats a mosfet regulator? could this save those of us whos warranties are running out? could this be the burned up stator fix? I know an '08 stator and rotor swap seems to be the current consensus for a permanent fix looking for some eduction if you have time, thanks todd | ||
| Keef |
basicly the regulator on the 1125's are shunt type regulators that shunt the power not needed to ground where as the mosfet regulator opens up a leg off the stator to control output it makes less heat at the regulator and heats up the stator less also...there is a sweet posting that has links and directions for the mosfets here on the badweb.. | ||
| Keef |
www.badweatherbikers.com/buell/messages/290431/580 833.html?... go here | ||
| Blk09r |
Todd - I believe a mosfet regulator will put just as much load on the stator as the stock SCR regulator. The mosfet regulator is a better design however and should last longer than the stock unit. My regulator started overcharging at about 1700 miles. I've got about 600 miles on the mosfet and so far so good. Here's a link to my install. http://www.badweatherbikers.com/buell/messages/290 431/588143.html?1282091581 I think I read where someone got theirs to fit in the stock location. | ||
| Keef |
and another www.badweatherbikers.com/buell/messages/290431/578 689.html?... | ||
| Reepicheep |
We are misusing terms again. The discussion is really series regulators versus switching regulators versus shunt regulators. Here are the differences and implications: 1) Shunt Regulator. When the output voltage of the stator goes above 14.2 volts, the output of the stator is just shorted to ground. So the stator is putting out 100% power all the time, and when shunted the stator windings are dissipating the excess power as heat. 2) Series Regulator. When the voltage output by the stator goes above 14.2 volts, the voltage regulator "takes" the excess voltage across itself and prevents it from reaching the rest of the bike. So the stator is still putting out 100% power all the time, but the excess heat is being dissipated across the voltage regulator in addition to the stator. 3) Switching Regulator. The voltage from the stator is shorted on or switched open (off) tens of thousands of times per second. The duration of the "on" time varies based on the load needed by the motorcycle to maintain 14.2 volts. So the stator is only putting out as much power as is necessary based on the current electrical load on the bike. So there is no excess power to be dissipated anywhere. (I think this is right off the top of my head, but I should probably do some math on #2 to verify it). There are other subtle advantages to the switching regulator as well. Switching regulators, because of their operation, are nearly always built using MOSFETS. You could make a decent shunt regulator from a MOSFET as well. But the MOSFET isn't the important part, the operational mode of the regulator is. The factory fix of opening up one leg during vulnerable operating modes is a reasonable alternative to a VR change... though at the risk of lower charging under some circumstances (that may very well never matter, or may matter, I don't know). (Message edited by reepicheep on October 27, 2010) |
