....i have got in my secret car LOL a AFR meter its LED's i am assuming its a narrow band setup......of what possible use is it?..Is it at all useful? (possibly a weber alpha)

 

phil in a word no unless its bin calibrated against a wideband


cheers jay

 

......cheers i am used to the wideband motec gold box set up....so had never looked into the narrow bands.

Seems strange they are of no use i would guess the mixture comming out would show a vague idea surely?

 

yeh but its a little like playin darts in a dark room lol
there just not the most accurate way of reading a afr


cheers jay

 

bttt!

 

Phil, they are of no use for mapping a car on boost, but are vaugely useful for checking that a car is running economically at part throttle.

People sell them because people buy them, not because they are very useful.

The narrow band sensor is basically only guarenteed as reliable as a switch around 14.7 AFR

So if will show you if you are above or below 14.7 AFR but it wont accurately tell you how much by!

 

thats the term narrow band as will only read around the econ level of 14 to 15 afr it will give inacurate reading under or over that in most cases

cheers jay

 

What he said, just so you believe .

 

What they both said

 

Narrowband will clearly never be any substitute for wideband, and can not be considered as a tuning tool as such in that it won't indicate any sort of AFR accuracy except around 14.7:1 as already said..
BUT - if you take a wider view, it can be useful to tell you if anything is going wrong... if it's running rich on light load it will be obvious, if it's running lean on boost it will be obvious, by which i mean seriously lean... I've had a boost pipe come of the Fuel pressure reg. for example, or if the fuel pump has a big problem..

 

What about on a N/A car?

still useless?

 

Same applies really as with your foot down you will still be running richer than the rich end of the scale.

 

So of use to actually detect a major failure before it happens!!! Thats all thats needed to know...this new car has one really neat install so i wont bother taking it out.

For serious stuff the GGR innovative wide band unit is being used

 

Which one, as the version that Stu tested in PF recently, wasn't particularly accuarate, and showed it being richer than it actually was...

 

...whatever stu recommended i get!