My bike transfer from AC to DC and using Fi By kosousa (Read 1,817 times)

[kosousa]

Hi,
My bike imported from Thailand,it did not have switch,the technician modify it have a swith to turn off and turn on the lighting.The Electric default is AC.
When i use Koso RX2 Meter,i should change it to DC Electric.
I would like to ask a question,the ECUs on my bike is suitable for DC Electric or i must change it to default Electric(AC Electric)??The RPM will lose at WOT or not ??
How does the new Electric affect to bike if i change it to DC instead of default AC?
Thanks

[sprocket]

Most scooter are both AC and DC...AC direct from the stator and DC from the regulator rectifier...

[Bashan]

What kind of bike is it? The Koso meter runs off of DC so you'll need to hook that to the battery with a switch. Or if the technition provided a DC power board you could just hook to that. I would imagine that whatever original power source from the bike that the ECU has you'll have to stick with that. Most computer modules run off of DC but that's after the internal power supply converts it. So if the ECU is designed for AC you'll have to hook that up to it. It's not a matter of how it would run, it's a matter of it wouldn't run at all and you could damage the ECU. Rich

[sprocket]

I have seen ACV ECUs but they usually have their own rectifiers, so they actually run on DC.

I would think all the ones on scooters are DC... as Rich mentioned

[kosousa]

My bike is scooter.The technician runs parallel two charger on my bike-one default charger for Fi and one charger of Spacy.
I will change it to default Electric.
Thank all.

[Bashan]

I kind of figured it was a scooter, I was curious who made it. Like if it was Chinese it might be Bashan or CF Moto. Also, I wondered how big the engine was, the number of ccs. Hope everything works out for you. Rich

[kosousa]

It made in Honda Thailand.
The engine is 124cc,1 piston.
Could you help me explain difference from AC and DC about RPM ???I think if i use DC electric,the RPM was reduced or not ?

[Bashan]

Great question, I had to think about that for a while. The two types of electricity that are used to power our scooters, and just about everything else, are alternating current (AC) and direct current (DC). In alternating current the electrons move back and forth in the wire. In direct current the electrons move in one direction from positive to negative; contrary to popular belief that's red to black. The juice on your scooter comes from your stator which makes just AC. Some of the AC goes to the CDI and some to your rectifier/regulator (R/R) to be turned into 12v DC and 12v AC. I'm not sure you have a CDI with an ECU, the ECU might make the spark. Scooters usually use a circuit to power a few things right off of the battery, that's a DC circuit. Due to convenience manufacturers like to run a lot of lights off of an AC circuit. The main problem with DC is line drop, the loss of power over the course of the wire. In scooters that's not really a problem because the distances just aren't that far. AC power is considered "dirty" because of voltage fluctuations. DC voltage is considered to be "cleaner" and that's why they use it for computers, including your ECU. I'm sure on your scooter (very nice by the way) your ECU is already powered by DC and must continue to do so. Even if it's an AC feed to your ECU (something to think about on your conversion), it's being converted internally to DC. It's the ECU which is controlling the spark and that determines your RPM. So going all DC should not affect the performance of the scooter, including RPMs, in any way; you're already DC on that. Going all DC will probably make your lights burn more evenly and allow to use unidirection LEDs if you wish. There is no all AC, you have to charge the DC battery somehow. Rich

[kosousa]

Below my seat,Honda technician designs a device to convert AC electrics for stable volt to ECUs.
Thanks for your sharing.

[Bashan]

Sept 6, 2011 18:26:48 GMT -6 kosousa said:

Below my seat, Honda technician designs a device to convert AC electrics for stable volt to ECUs.

[/b][/quote]
Wow, we'd love to see some pictures of that. But I think this comes back to my point, changing your power sources won't change your RPMs. The ECU or CDI controlling your spark needs a certain type of electricity it can operate on. After that, it's the internal configuration of the component that determines how it manages the spark, not how much or what kind of electricity powers it. Rich

[Alleyoop]

Yes, put up some pictures of your setup, we are very Interested on this device under your seat and the EFI setup.
Alleyoop

[kosousa]

I must come to my company to work,in this morning i will take a picture and post it to you see.
Thank all.

[kosousa]

Sorry for replying late because i have a deadline with Avaya and i have no time to online and upload.
There is a device which i said.

[sprocket]

That is a double ballast resistor... 20watts 10 ohms times 2

Here is what they look like on Chinese scooters.

There are used to control the voltage on the lighting circuits and also the enricher circuit...

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[kosousa]

Hi Sprocket,
I do not know because in the same model with my bike is using carburetor they do not have this device.
Thanks,