Tuning: Dyno A/F vs Wideband A/F

[BADASS03SVT]

Im going to play on the dyno next week and wanted a little more aggressive tune done. We got the car right at 11.6-11.7 on the dynojet wideband but my Innovate wideband reads 11.0. Has anyone tested to see if the widebands are accurate? if I can lean it out a bit might be able to pick up a few ponies by using the wideband for a/f.

[Eric Brooks]

I've been meaning to make a post on this topic and I probably will (and supply data) in another thread.

I have little faith most widebands, specifically the ones that utilize a Bosch sensor.

I ran my wife's Mustang on my dyno, and put the DynoJet wideband in the rear 02 sensor bung, made a pull, and the airfuel was off the charts rich. Meaning richer than 10.0:1

I then put in my AFM-1000 wideband in the same spot, and made another pull and the airfuel was 11.5:1.

If I were tuning the car with the DJ wideband, I would have pulled fuel out to make the airfuel look better, but would have ended up with a dangerous mixture.

Just my experience.

[BADASS03SVT]

I've been meaning to make a post on this topic and I probably will (and supply data) in another thread.

I have little faith most widebands, specifically the ones that utilize a Bosch sensor.

I ran my wife's Mustang on my dyno, and put the DynoJet wideband in the rear 02 sensor bung, made a pull, and the airfuel was off the charts rich. Meaning richer than 10.0:1

I then put in my AFM-1000 wideband in the same spot, and made another pull and the airfuel was 11.5:1.

If I were tuning the car with the DJ wideband, I would have pulled fuel out to make the airfuel look better, but would have ended up with a dangerous mixture.

Just my experience.

wow...yea...thats a big difference!

in my case also, the dyno sniffer is at the tailpipe AFTER the hi-flo cats and my wideband is right before the cat. not sure how a cat affects the readout?

[Eric Brooks]

After cat will slow slightly leaner, near the start of the pull when the catalyst is full of oxygen.

[SilverBoost]

this is no good. If this holds true then owning a wideband in a car is a waste of money.

[03WhiteGT]

Subscribing

[04MystiCobra]

Dont forget to read plugs too.

[FULLBLOWN03]

I have been tuning my car with an innovate lc-1 for the past three years, but i like to tune mine on the street. I even had the kb2.8 at 27psi tuning to this wideband never had any problems so i trust it. Just keep a fresh o2 sensor in it every now and then.

[NeverEnuff]

My dyno shops WB reads quite a bit leaner than my WB in my car. I sit in the 11.5 range and he reads low 12s to 12.4ish. Then when I stuck his WB IN my pipe his read like mine. So I will believe mine before I will believe a tube stuck in my tailpipe.

Now I know I don't have a ton of experience...but this is of course just what I have seen and done.

[BLK_03]

I've been meaning to make a post on this topic and I probably will (and supply data) in another thread.

I have little faith most widebands, specifically the ones that utilize a Bosch sensor.

I ran my wife's Mustang on my dyno, and put the DynoJet wideband in the rear 02 sensor bung, made a pull, and the airfuel was off the charts rich. Meaning richer than 10.0:1

I then put in my AFM-1000 wideband in the same spot, and made another pull and the airfuel was 11.5:1.

If I were tuning the car with the DJ wideband, I would have pulled fuel out to make the airfuel look better, but would have ended up with a dangerous mixture.

Just my experience.

New sensors on both and freshly calibrated?

That is quite a difference.

If I'm going to be making tuning adjustments to the car, the first thing I do is install a new sensor and calibrate it.

[Eric Brooks]

New sensors on both and freshly calibrated?

That is quite a difference.

If I'm going to be making tuning adjustments to the car, the first thing I do is install a new sensor and calibrate it.

Yes

I working with someone very knowledgeable on UEGOs to give me some information on the differences. Its not all the sensor, a great deal of the accuracy comes from the electronics.

The NTK sensor for my wideband costs what an LC-1 costs.

[BADASS03SVT]

I have been tuning my car with an innovate lc-1 for the past three years, but i like to tune mine on the street. I even had the kb2.8 at 27psi tuning to this wideband never had any problems so i trust it. Just keep a fresh o2 sensor in it every now and then.

this was what I was about to ask...who street tunes their cars? Ive seen a few people mention this in threads and wonder who's wideband they are using.

I mean...which is correct and how can we tell??

[FULLBLOWN03]

this was what I was about to ask...who street tunes their cars? Ive seen a few people mention this in threads and wonder who's wideband they are using.

I mean...which is correct and how can we tell??

I was having Jon Lund(one of the best IMHO)tune my car. I would do some logs on the street email him the logs and he would adjust my tune accordingly. Like i stated I have logged and tuned to this wideband for 3 years and my combo has changed alot in those 3yrs.

[Eric Brooks]

I'm not saying you can't use one of these widebands for tuning, but just know that there is a good chance the airfuel isn't that accurate. More info coming soon.

[WDW MKR]

Is there a better replacement available to use in place of the Bosch with the Innovate and DJ widebands?