achieved this by using a
Dynamic Simulation Model©
to precisely model how the
single-choke and diaphragm carburettors work and by incorporating a unique
calibration facility into all versions of Jet-Tech software. Unlike other
products on the market, Jet-Tech uses its unique calibration to exactly
match your individual engine/carb/exhaust combination and setup.
manufacturers quote a 'standard' spec for engines, and especially sealed
racing engines such as the Rotax FR125 MAX, the fact is that no two engines
are the same. In the case of the MAX if you were to dyno them, although the
power would be within a small margin similar, the characteristics of each
engine will be quite different. You are unlikely to ever find two engines,
for the same given spec that will use the same jetting and needle clip
position throughout the throttle range.
So, how do
other vendors compensate for this? Other products on the market provide an
'adjustment' to 'correct' the jetting information that they provide. This
isn't to compensate for different engine/carb combinations and individual
characteristics but to compensate for the inherent inaccuracies in their
products calculations. Many products
use a straight-line correlation between the jet and needle clip position ie.
starting with say a 165 jet at clip 4, as the weather requires a change in
setting, they will step up through clip 3, clip 2, clip 1 (or down) then to
the next jet size at clip 4, 3, 2, 1 etc. Put simply, the Dell'Orto carb
just doesn't work like that so even if an optimum setting is achieved, as
the weather changes from that setting, the error will be magnified. Some of
the other products on the market don't even take into account the different
float weights, float height setting and idle/pilot jet combinations etc that
may be used.