I know there has been a lot of debate over tuning on the dyno vs. on the street. My car was originally tuned in October of '06, it was a pretty cold night and the car was tuned by Paul Meister of Steeda on a loaded mustang dyno. Since there has been so many comments about dyno tunes not being the same once the car is on the street, I decided to hook up a wideband and go for a drive to see what my air fuel was. The temp was around 87 degrees and there was a fair bit of humidity in the air. With the wideband hooked up, and on a country road, I did a pull from 3rd gear to redline....My air fuel was a consistent 11.8 to 12 which is exactly the same as what we had on the dyno.

I just wanted to share my experiment with the cobaltss.net forum, and for me this confirms Pauls abilities as a tuner.

 

well with the dyno tune you know exactly how well the tune is power wise, with the street tune your power estimates are off the butt dyno.

 

I think the biggest issue people had with a dyno tune was that they claimed that you couldn't reproduce the load and airflow you get on the street. They claimed that this would cause you to run lean due to the added air. With the way that Paul tunes this is not an issue, plus with the dyno that he uses, it is able to load the vehicle and produce a very reliable and safe tune.

 

The dyno is good to tune for maximum power. The street is good to tune for all driving conditions and you can achieve better driveability by tuning using street datalogging.

 

That is why Mustang Dynos are the better choice for tuning purposes. They add load when speed is increased to simulate drag as if you were driving on the road. That is why Mustang Dyno numbers are typically lower then DynoJet Dyno numbers.

 

Yep. Dynos do have their purpose. They may not be quite as dynamic as the street is, but to fine tune you need to have control over the running condtions which generates consistency.