CHIP Mixture Meter – first presented in
1995 – is one of the most popular performance car electronic kits ever produced.
Literally thousands have been built, each showing by means of 10 coloured LEDs
whether the air/fuel ratio is rich or lean.
While such a design – which works from the car’s standard
oxygen sensor – won’t give you an absolutely accurate readout of the mixture
strength, it’s far better than having no indication at all as to whether the car
is running rich, lean or at stoichiometric (the latter means an air/fuel ratio
of 14.7:1). As a bonus, it also clearly shows if the car is in closed or open
The new Smart Mixture Display presented here still displays the
mixture strength by means of 10 LEDs – red for lean (red is for danger!), green
for mid-range mixtures and yellow for rich. However, we’ve added three important
extra features with this new design:
(1). Better protection of the electronics (in some cars, the
old design was prone to blowing its chip);
(2). An automatic dimming function for night driving; and
(3). An audible lean-out alarm.