Dawes Device A/F meter

[spatulahunter1]

http://www.3barracing.com/product_3.htm


A guy that i work with was telling me about this product, he seems to think that they work really well and eliminate the need for an expensive Wideband o2 sensor setup. I dont know anything about the product but it seems like its worth the $60 asking price if its effective.
Does anyone have any experience with this product? If so how would this compare to using a wideband setup?

 

[Quasimondo]

It takes it readings from the stock narrowband O2 sensor. IMO, this makes it no more accurate than the blinking light gauge that autometer sells. It wouldn't be useful in a 1G for this reason:

First light: Red= .78 to .90v
Second light: Yellow= .90 to .94v
Third light: Green= .94 to .98v
Fourth light: Blue= .98v and up

At WOT, a 1G's O2 reading is somewhere around .80v. For 2G's it's around .90v (somebody correct me if I'm mistaken). This makes it completely useless for 1G's since it will always read that it's running dangerously lean when it's probably running ridiculously rich, and likewise for 2G's (except it will indicate a good a/f ratio when you're also running rich).

Either way, using this device to tune instead of using a wideband O2 sensor would be a mistake in my opinion.

 

[spatulahunter1]

It takes it readings from the stock narrowband O2 sensor. IMO, this makes it no more accurate than the blinking light gauge that autometer sells. It wouldn't be useful in a 1G for this reason:

First light: Red= .78 to .90v
Second light: Yellow= .90 to .94v
Third light: Green= .94 to .98v
Fourth light: Blue= .98v and up

At WOT, a 1G's O2 reading is somewhere around .80v. For 2G's it's around .90v (somebody correct me if I'm mistaken). This makes it completely useless for 1G's since it will always read that it's running dangerously lean when it's probably running ridiculously rich, and likewise for 2G's (except it will indicate a good a/f ratio when you're also running rich).

Either way, using this device to tune instead of using a wideband O2 sensor would be a mistake in my opinion.

that makes sense, i dont know much about what the voltage should read from an 02 sensor at all.
Does that reading stay the same always throughout WOT? If it does how does the computer use the sensor to make adjustments if it always gets the same reading (not arguing, im just asking cause i dont know and im interested)

 

[Pure92TSi]

At WOT, a 1G's O2 reading is somewhere around .80v. For 2G's it's around .90v (somebody correct me if I'm mistaken).

I think you might be wrong about the 1G but who knows. Stock narrowbands are useless. Read this link it gives a little bit of info about O2 readings:

http://roadraceengineering.com/instructions/autotimer.htm

bout 3/4 down the page

 

[dsmgrimreaper]

well i didnt even read into that far and thought it was completly useless but thats just me, it might work for someone else but id rather get the right set up

 

[dave99gst]

Its no better than any blink light a/f gauge.

.78 - .90v for 1 light is kind of a large range.
generaly .78 volts @ wot is prob too lean. while .90 is about right.
with only 1 light representing the entire range you have no way of knowing.

 

[u12run]

Go to RRE website and look at how to tune using the jumptronic. If don't have a turbo timer yet apex has one where you can hook it up to your O2 sensor. This will allow you to kill two birds with one stone. My friend uses this to tune his evo