I had my car dyno'd on a portable Dynojet that was trailered in to a car show I attended. There was no A/F capability. I was wondering if these portable units are as accurate as the ones you would find in a shop somewhere ? I didn't get a chance to watch the guy set up the various parameters so I was wondereing if he evn knew what to input. Things like weight for instance. Do they have a computer software package that gives them all that data and they just punch in what year/car type (coupe/vert), etc. ? I did get the dyno sheet when it was all done which I was fairly happy with. Especially since a new WS6 Firebird went just before me and pulled an astounding 301 rwhp. Sounded like he had at least changed out exhaust too.