Kat EFI batteries

[GSX1100 dreamn]

It was always going to be interesting to see how the charging/battery system was going to cope with the large increase in amps required and also the drain fron turning a 1260cc motor.
So I took steps to counteract this draw/drain by putting 2 batteries in a lithium 190cca and a large made for 1250 Bandit battery 230cca.
I also increased the battery cable size to 10 gauge.
The new bandit battery on the left.

The lithium waiting for the other battery to sit on it.

Batteries installed.


The bandit rec/reg and starter relay mounted

The larger battery cables.

Cheers Andrew.

[GSX1100 dreamn]

At the moment it seems to be holding its own.
At the lights headlight/blinker/brake light on it sits at about 12.6v.
And riding around it sits at 13.5v.

[posplayr]

At the moment it seems to be holding its own.
At the lights headlight/blinker/brake light on it sits at about 12.6v.
And riding around it sits at 13.5v.

Isn't that Bandit R/R for an alternator system like the GSXR have?

The best way to improve the electrical power situation is to change over to LED lighting. About 7 amps of your 15 amps max total load (stock) is from lighting. You can easily cut that down 1/2 to a 1/3 which would compensate for your new fuel pump requirements (5 amps?).

While higher capacity batteries should allow you to run longer, they also take more current to charge so there is a diminishing return. At 5K RPM there are about 3.5 charging amps in a 14 amp-hr battery (C=3.5/14=1/4) and if you double the battery up to 28 amp-hr , then the C=1/4 charging is now 7 amps.

Unfortunately the charging system can't put out much more than 15 amps total. Essentially you are just running at least partially like a like a total loss system.

[GSX1100 dreamn]

Your correct it isn't a solution just a patch until I can reduce load/increase output.
Not sure about the GSXR alternator but the Bandit one is similar to Kat one driven off the end of the crank.

There have been others who have adapted later model alternators but more to get the benefit of better design stater clutch with slight increase in power output.
Cheers Andrew.

[posplayr]

That looks like a Permanent Magnet (PM) Alternator (like a GS) and not a field controlled alternator (like the GSXR or standard car alternator).

The GS/Bandit have magnets to establish the magnetic field where as the GSXR uses a field controlled electromagnet. With the Electromagnet when you want to regulate you simple reduce the current in the electromagnet thereby reducing the charging current. The PM regulators are either shunt (short the output) or series (open a switch) for the output current.