TR6 owners are more knowledgeable than most when it comes
to fuel injection - certainly the mechanical injection of
the Triumph 'PI' cars could produce good power. Unfortunately,
this was a long time ago when fuel cheap! It's not the most
flattering photo, but what really makes this car stand out
from the crowd is under the bonnet...
of this car is enthusiastic about the benefits of LPG, and
combined with an electronically controlled fuel injection
system he's able to flip between petrol and gas at the push
of a button.
speed and timing information is taken from a 36-1 trigger
pattern machined into the crankshaft pulley. The LPG ECU
intercepts signals to and from the Canems unit to calculate
the quantity of gas required.
previously run with mechanical injection, converting to
EFI was relatively straightforward. The original mechanical
injector positions were used for the electronic injectors,
and a new fuel pressure regulator reduces fuel pressure
from approximately 105 PSI down to 45 PSI. The owner of
this car was fed up with balancing the individual throttles,
so they were removed in favour of a larger single throttle
butterfly placed at the end of the plenum.
As it stands,
the mapping for LPG still needs some fine-tuning, but the
basics are all there. When the LPG system takes over, the
Canems unit is still providing ignition by means of a wasted
spark coil pack. Once the car is running on gas, the ignition
can be advanced to take full advantage of the high octane
rating - an advantage that comes about through the switchable
maps in the Canems ECU.
an exciting project that can only enhance the appeal of
a classic sports car like this - not only will performance
and reliability be improved, but fuel economy and emissions
too, by quite a considerable margin.