AFR gauge

[djchickcrx]

Hi all,

Considering putting an Air:fuel ratio gauge into my crx. Seeing as the car isnt selling, Id like to possibly get the carbs tuned up so it runs as economically as possible.
Not sure I fully understand the concept, so have a few questions;

The AFR gauge, which reads lean, stoich or rich, is basically an o2 sensor. The O2 sensor itself is also called a lambda sensor? This screws in somewhere along the exhaust. Is the above correct? Is it also called a wideband sensor, or is this something different.

If so, can anyone recommend a standlaone unit, with o2 sensor, for reasonable money? Ive seen some of the stuff on ebay, but its expensive. There are cheaper gauges, that only come with a wiring loom. Would it be possible to wire this into the 1.5x d15b engine, or would those be only suitable for a car with obd1 or similar.

Any info would be of great use lads.

[djchickcrx]

Should add, that I already have a place to screw in an extra o2 sensor, it is on my decat pipe.

[C-Rex]

Widebands are pretty expensive alright considered getting one for my CRX to monitor the engine. The gauge itself will only show you how lean or rich it is running. Getting it more economical would require a proper setup of the carbs

[djchickcrx]

Is 'wideband' the same thing as AFR?

[mcd22]

Wideband refers to a 5 wire O2 sensor.

All standard cars with modern ecus run with 4 wire O2 sensors. These are called narrowband.

Afr stands for air fuel ratio. It's how many parts of air you mix with the fuel before entering the cumbustion chamber.
Think of it like mixing your Mi wadi with water.

Wideband sensors can accurately measure lean to rich mixtures. This is the sensor required for tuning.
A minor bit of extra info about this sensor, Honda invented it. They used it on the 1.5vtec e to accurately measure Afrs.

Narrow band sensors only measure lean mixtures. Lean starts after an age of 14.7 Any more parts of air to fuel than that is not good for your engine.

All in all James buying one of them to try make your car more economical is a waste. Your looking at spending €250 On a part that will take extensive tuning to try make it more economical.
250 is a nice bit of fuel.

[mcd22]

Plus, when you install this device, your actually gona use loads of fuel trying to set it up.

I've successfully tuned my 2.8 diesel jeep lately. But used significants amount of fuel doing so, but I have made it more economical with a lot more power.
It involves modifying the diesel pump, removing egr, and increasing boost while modifying wastegate so boost in built much earlier.
This took 1 months of testing

[Stephen K]

Gary if I went and brought an 02 sensor off an 1.5 vtec-e civic would I in theroy have a wide band sensor that I could use for a gauge? Is it a cheaper alternative to buying an after market one? Would it be as accurate as an aftermarket sensor?

[mcd22]

Calibrating it too your gauge is a problem
Plus, there not a sensor you want to read incorrectly, so I change mine regularly

[djchickcrx]

fair points, cheers Gary