I went to the dyno today and got some data from the dyno operator. I am attaching a spreadsheet that contains two plots: one comparing my in-car WBO2 (PLX M-300) to the dyno tailpipe sniffer (DynoJet), and another plotting the wheel torque and horsepower. I'm posting this in the PFC forum because I used a Datalogit to collect my data I'm posting this for informational purposes only, I was looking for someone to compare in-car WBO2 to dyno WBO2 with real data, and I didn't manage to find any so I decided to do my own. They are not exactly equal, but when full boost comes online and is steady they agree reasonably well.

You can see more info about my car, etc. in the 3rd gen dyno section. HERE Hope this helps someone in some way

EDIT: BTW, my WBO2 is in the downpipe, a good bit before the cat converter. The tailpipe sniffer was, well, in the tailpipe.

 

I noticed an error in my dyno/torque plot. I'll repost the corrected one later tonight.

 

Find attached the "corrected" dyno graph. The previous one was correct in the sense that the numbers corresponding to torque/horsepower and revs were OK, but the scaling was different on each axis (hp went from 0-350, tq went from 0-300) so they didn't cross at the 5252 rpm point.

 

Did you baseline your wideband as per Chuck's recommendations?

 

I sure did. I used his method of removing the O2 sensor and exposing it to a air/fuel mixture and matching up the DL read numbers with the one shown on my WBO2 display. Works like a charm. I was just curious to see how the dyno readings compared to the ones I saw. The dyno samples at a much slower rate than does my datalogit. I'll check on that later.