Interesting... but they kind of play fast and loose with terminology
with statements like "we create an open ignition circuit that disables
the starting circuitry at the starter".
The starter doesn't run the car. A relatively light manual-transmission
vehicle such as the Tiger, can easily be push started once you bypass
the ignition switch. Therefore, the only true security mechanism is to
disable the fuel pump, and/or the ignition itself, if the car is not
started properly. You can do that in a couple of ways. The powerlock
website pooh-poohs ignition and fuelpump bypass relays. That's
understandable, since a piece of jumper wire can easily bypass the
relay. But what if you took the opposite approach? You wire in a circuit
that uses a relay to ground out the fuel pump if the alarm is triggered.
Now, anyone that triggers the alarm prevents the fuel pump from
operating. If they do bypass the ignition key and get 12 volts onto the
fuel pump circuit, they blow whatever fuses are inline to the fuel pump,
further compounding their problem. If the fuse(s) are located in an
unconventional place, then the would-be thief is going to have a hard
time quickly solving that problem.
Another approach is to use an authentication system integrated into a
vital part of the engine controls. Suppose you use an MSD or similar
ignition controller. It includes a feature where grounding the unused
ignition trigger wire disables the ignition. I'm sure that any
knowledgeable thief knows about that and may attempt to circumvent any
obvious use of that feature, but it is possible to integrate a wireless
receiver onto the MSD box such that it will only un-ground that wire if
the receiver is receiving coded messages from a short-range transmitter
that you carry on your person. With the whole thing built into the MSD
control box, there is nothing external for the thief to work on unless
he brought his own MSD box to replace yours.
Theo
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