air fuel guages

[qikr33]

what is an accurate and reliable guage i can buy for monitoring a/fuel ratios.I know that a programmable ems with hand controller would be best but are there any units available that could be used for self tuning purposes

[Roy13]

Yes link make one $400 and $350 for the sensor (wide band) perfect for tuning! Looks great to but out of my price range!

[roz85]

how accurate are autometer a/f gauges. I have myself one, dont know how well it works, though it looks pretty cool.

[Roy13]

If it hooks up to your existing oxygen sensor it isn't good enough to tune with but just give you an idea of how its running!

[Guest mort]

A decent a/f meter for tunning purposes will set you back around $2000 but you must make sure that the unit has temp compensation otherwise the reading will become inaccurate at high exhaust temps.

[Sydneykid]

Hi Roy13, in my terminology there are 4 descriptions of lambda sensors;

narrow band

wide band

slow reacting

fast reacting

The standard lambda sensor found on production engines are what I call slow and narrow (they cost around $100). The ones we use on the dyno for tuning are what I call fast and wide (they cost around $2,000). There are a number around that are what I would call slow and wide (they're the ones that cost around $500).

The meters that read these sensors come in a variety of types with the main differences being display type and memory capacity.

Knowing this it is easy to see that tuning using a slow and wide sensor and an instantaneous display with nil or limited memory is almost impossible.

Hope that makes sense.