Triumph Herald 1360
As with many
cars of the same era, subtle modifications on this Triumph
Herald have been added over the years. After a full rebuild
including uprated suspension and brakes, the owner of this
car was looking for an increase in power.
including a change of cam and a swap to twin 40 Webers meant
an ignition system upgrade was required. To get the best out
of the car, a Canems Ignition ECU was fitted.
of the car had sourced a nicely made alloy pulley, onto which
a 36-1 trigger wheel had been fitted. The trigger wheel was
an ex-Ford Sierra item, which was an excellent fit. Unfortunately
these cars are getting hard to find in scrapyards nowadays
but similar laser cut trigger wheels are available from us.
hard to get a smooth vacuum signal from car with Weber carbs.
Like this Herald, most Weber setups only have one vacuum takeoff
point, originally intended for a brake servo. For this reason,
a throttle position sensor was used as a load sensor, rather
than a MAP sensor which uses a vacuum reading.
fabrication work enabled a throttle position sensor to be
mounted on the end of the carburettor spindle. Once this was
physically in positon it was simply a case of calibrating
the TPS with the Canems software. A reading is taken when
the throttle is closed, and again when the throttle is wide
open. The Canems ECU then knows what you are doing with the
accelerator and adjusts the ignition advance to suit.
initial fitment, the owner was very pleased with reliable
starting and smooth idle characteristics - especially considering
the state of tune of the engine.
Most people with Weber carbs remove the vacuum advance pipe
from their distributor because there isn't anywhere for it
to connect to on the manifold. There also seems to be a common
opinion that removing the vacuum pipe is what you do on a
'racey engine'. On a full race engine, which doesn't need
to idle or be driven in traffic this is fine, but lack of
vacuum advance will not help the engine to idle at all well.
As this Herald had a load sensor, the idle characteristics
could be transformed just by changing the advance figure by
a few degrees.
car will be heading to the rolling road once the engine has
been run in - it'll need the carbs setting up correctly. It'll
be interesting to see what figures the engine produces and
how much difference the ignition timing makes on this particular
the engine sufficiently run-in,
and the reliability of the rest of the car proven, the Herald
was booked in for a rolling road session at Bogg
Brothers in East Lutton near York. After adjusting the
Weber carburettors, several changes were made on the Canems
ignition map. Retarding the ignition timing slightly at low
speed helped to bring down exhaust emissions, reflecting a
more efficient combustion.
slowly building up to some full power runs, a suitable maximum
advance figure was decided upon. With the Canems ECU programmed
correctly, it was time for the moment of truth.
final power reading showed a very respectable 80bhp at the
wheels, translating to approximately 100bhp at the flywheel.
This should make for a great road car, and above all, the
Canems ignition system will give dependable running whenever
the car is used.