Air Fuel Ratio Meter

[TURBO4LT]

I was just wondering has anyone fitted one of the AutoMeter AIr Fuel Meters?

[scott52]

I've just bought one from jay-car. I'll let you know once it is fitted. I bought it because I think my car is running too rich. it uses lots of fuel even when I try to conserve it. a recent country trip at a stead 110-115 delivered an average of 11.0lt/100km

[twinxrs]

I'm starting to think the same thing... Fuel economy doesn't drop below 14.5 even after a long trip on the highway !

I'm sure that it's running rich, as there's a fine black power on the back of the car all the time. I just washed it yesterday, so I'm going to take careful note, but I've noticed this before, 2 or 3 days of city driving (not stop-start even) and the lip on the rear bumper bar just looks like it's never been washed.

The car's a citric acid, so it might just be showing the grime more than I'm used to, but has anyone else see this ?

[Zeke]

That sounds a bit OTT. I trust you're restting the computer before the highway trip or using instantaneous consumption. If so, and you're getting those figures, then something's wrong! Unless you cruise at 160 or something!

zeke

[TURBO4LT]

Well I bought a 2 gauges air fluel and boost ill fit them on the weekend and see how we go....I usuallly get 14.5/100km that's mainly city driveing

[Turbo6man]

Yes, they do run rich - Ford have erred on the safe side because, I suppose, they are fully expecting people to mod their exhaust or tamper with their boost etc which generally results in the mixture leaning out a little.

Running rich will drop power but also drop combustion chamber temps slightly - so you can easily understand why Ford would build in some engine protection by doing this...

[Ford_Power]

Turbocharged cars are generally run richer so as to keep the combustion chamber temperature down and given worst case conditions (eg high engine temp, heavy load) the engine will not ping, and thus get damaged.

Although, it is worth pointing out that it is generally at WOT that the mixture is set to run rich and not at stoic. The mixture should not really be rich under part throttle. (cruise)

Ross

[TURBO4LT]

Well Ive fitted the Boost and air/fuel meters, and it runs in closed loop cycling pretty quickly at idle and cruise. Under part load like 1 to 2 psi it still works in closed loop . When you floor it boost goes to 5psi and mixture sits on 12:1 steady. A few times when I plant it , the boost spikes to 10psi especially when the traction control comes in , feels good whilst it hits 10psi but quickly goes back to 5psi.