Wideband Dyno??

[Shirl]

Exactly how is the air/flow ratio measured on a wideband?? Experiences with this?? Getting tuned on a dyno within a week or two...

[Magnus]

they use a different o2 sensor that is put into your exhaust pipe. It's a very accurate sensor, more acurate than the normal ones in your car.

[Tyler]

SO... if i wanted to put an A/F ratio guage in my car.. im better off buying 1 wideband o2 sensor, and adding it to my y-pipe or something?

[Magnus]

wideband monitoring kits are around 400 bucks

[Tyler]

not a problem... just gives me a reason to save more money and spend less on taco bell

[AZ3.8Camaro]

Can't you buy a widebad O2 sensor and then just hook it to a normal A/F Gauge. I heard that works well. Not quite as expensive.

[Magnus]

no.

[Shirl]

As you said, Keith, it's suppose to be more accurate. I've noticed with autotap, the numbers fluctuate too much and it's difficult to get accurate readings. I have to keep freezing each frame during a run to read the millivolts. I was told that autotap's not as accurate because the readings are going through the PCM first. I guess wideband is the way to go afterall.

[ September 19, 2003: Message edited by: Shirl ]</p>

[merlinsrealm]

<blockquote>quote:</font><hr>Originally posted by Shirl:
As you said, Keith, it's suppose to be more accurate. I've noticed with autotap, the numbers fluctuate too much and it's difficult to get accurate readings. I have to keep freezing each frame during a run to read the millivolts. I was told that autotap's not as accurate because the readings are going through the PCM first. I guess wideband is the way to go afterall.

[ September 19, 2003: Message edited by: Shirl ]<hr></blockquote>

Shirl With dynoing on a widebad I was able to tune my A/F so it was 13.0 across the board while the car is being pulled on the dyno.....If you have tuning capabilities do it.

[Magnus]

autotap's readings aer as accurate as the sensors will alow, the PCM doesn't modify them at all.

At WOT your #'s should remain fairly constant. If you have a lot of fluxuation over +/- .2 then I'd look at fueling. It should be very steady and changes should be gradual.

One thing I bet your car does is lean out a little bit in third.

[merlinsrealm]

<blockquote>quote:</font><hr>Originally posted by Magnus:

One thing I bet your car does is lean out a little bit in third.<hr></blockquote>


As most of our cars would especially if there are Intake or fuel changes done. Thats were the wideband come into play...With me I use the MAFT and as I am going up in the RPM band on the dyno I just click more or less fuel...By the time I am done tuning I run 13.0 across the board....

Another benifit is when you have the wideband done and know where your tuning is you will alway know your base and WOT so that you can adjust for things like a cutout at the track where you might need to run another 2% richer at WOT....one click and when done at the end of the night just click the WOT back to where you started.

[Magnus]

if you richen it up using MAF T+ for a nice fuel mix in 3'rd, you'll be even richer in 1'st and 2'nd.

[Tyler]

so then how do they fix the leanness in just 3rd gear???

also. im gonna be getting a wideband o2 kit for my bday... would i have to get 2 sensors.. one for each bank? or can i just put one wideband o2 sensor on my y pipe where the two banks meet?

[ September 20, 2003: Message edited by: Tyler ]</p>

[Magnus]

PCM reprogramming

[merlinsrealm]

<blockquote>quote:</font><hr>Originally posted by Magnus:
PCM reprogramming<hr></blockquote>


Untrue....

if after tuning with the MAFT dynoing the the car with the wide band...if its 13.0 across the board it is what it is...it isnt richer because of gearing or shifting. Dyno sheet is on my website to prove the point.......