It is absolutely critical that every vehicle is tested and the actual power output is confirmed.

Anyone can claim a map made a certain figure on another car. It means nothing unless it is proven on the vehicle itself.

Does that always mean a dyno? Not necessarily. We often combine dyno testing with real world data logging to get the full picture.

In this case, that process mattered.

If we had not tested and logged this van, it would have left, gone straight into limp mode, and nobody would have known why.

Instead, through proper data logging, we identified that the fuel system could not meet the demand of the calibration.

After identifying a fueling issue, we tried to work around it. The base calibration had worked well on other vehicles, but clearly this one was different.

We tested a number of adjustments, reducing fuel demand, limiting pressure requests and backing things off to safer levels. Even with only moderate performance increases, the vehicle still entered limp mode.

At that point it was clear there is a deeper issue within the fueling system that needs to be resolved before any tuning can be completed properly.

We declined to bill the customer. Even though time had been spent, we believe in being fair. There is no point charging for a result that cannot be delivered until the underlying problem is fixed.

That is the difference between guessing and knowing.