Trispark Mosfet vs Podtronics.

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htown16

htown16

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Was having the breakup at 3000 rpm with my new Trispark ignition and podtronics. Needed the podtronics for another project anyway so installed a new Trispark Mosfet unit. When I checked the voltage at the battery with the Podtronic it would be below 14 volts at idle and would increase up to about 14.3 when revved. With the Mosfet it sits at 14.65 at idle and when revved. Is the Mosfet dumping excess current at a higher voltage than the Podtronics? Anyone checked the output to battery with one fitted. Instructions says it should cut off at 14.5, guess another tenth of a volt doesn't matter.
 
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I'd forgot this morning to test it with the lights on. With high beam on it was reading around 13.5 volts at idle and 14.5 when revved. This is with led head and tail light bulbs.
 
FWIW, when I switched to a PodT over the OEM Lucas rectifier/zener, the charging voltage dropped slightly throughout the rev range. ;) IOW the OEM system was better at the job!

I switched because I ASSumed that 'modern' technology was better than 1973 technology. As the old song says, "It ain't necessarily so." :rolleyes:
 
htown16 said:
I'd forgot this morning to test it with the lights on. With high beam on it was reading around 13.5 volts at idle and 14.5 when revved. This is with led head and tail light bulbs.
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Htown,
I have been running the same set-up as you now have for over 2 years now with no problems along with a LI battery.Just my 2cents
Mike
 
MexicoMike said:
FWIW, when I switched to a PodT over the OEM Lucas rectifier/zener, the charging voltage dropped slightly throughout the rev range. ;) IOW the OEM system was better at the job!

I switched because I ASSumed that 'modern' technology was better than 1973 technology. As the old song says, "It ain't necessarily so." :rolleyes:
Click to expand...
With the old system of rectifier and Zener, the rectifier is the only significant resistance* in the charging system, so perhaps it’s more efficient than many transistor systems. Could be a useful power saving at low rpm. That doesn’t mean it’s “better” at regulating and charging a battery, than a modern Mosfet black box.

*I am ignoring the unavoidable battery, stator and wiring voltage drops.
 
Yes, I did a short video of the Tri Spark version and sent it to Steve, 14.4V at any engine speed, this was connected to a Yuasa YTX14AHL-BS. Mine has now been fitted since they were first available and has been trouble free. The Mk3 also kickstarts with no battery and no capacitor fitted just like it does with the battery fitted.
 
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