So first we needed to get a baseline on our in house Dynapack. For those who are not familiar this dyno attaches to the wheel hub. It is a pretty neat setup and has some pretty cool benefits of working this way. The main two are is it’s really quiet while in use so the only noises you will normal hear are coming from the the car. This makes it easy to hear if you have boost leaks etc. Also this dyno does not slip or spin the rollers nor the variable of rolling resistance from different tires compound and diameters.

We started with raising the the boost pressure since this is the easiest way to get power out of the ST. We settled at about 22 psi peak for the now. We did encounter some knock events. So the next step was the richen the afr up to cool the combustion. We set the AFR to 11.0 afr. While the knock did go away it did loose much of the power we gained by turning up the boost pressure except at peak torque which was roughly around 2500 rpm. The end result was to run the car a little richer at boost onset then to lean out the AFR as the boost started to taper and move a way from peak torque. Over the years with tuning turbo cars with very small turbochargers, we have found this is a pretty good practice to help knock. With more tweaking to the timing table we were able to get the results below. This is just the start we are definitely going to move on from here refining the mapping.  The Focus ST ecu is fairly complex so as we develop more parts and tuning more cars we will have more updates:

240-516-TUNE