That leads to a decrease in boost pressure, which means the engine isn't producing as much power. So, in a side-by-side test where you are timing how long it takes to accelerate from one rpm to another, if half of the test is done at reduced boost resulting from throttle cut, it becomes difficult to draw a conclusion about how the vehicle would have accelerated in the absence of throttle cut. The IPP IC's had TC on every FATS test, the stock IC's had it on 2 out of 5. Thus the stock IC's were running full boost on several tests while the IPP IC's never did. Trying to make a comparison about the power produced with each IC on the car was not something I felt was wise to try and do given the circumstances.

There is no speculation about the TC happening. I didn't include plots of the throttle cut because I didn't feel any need to, I felt stating that it had occured would suffice. I'll see about consolidating the data we have collected and making the file available so you can independently verify that I correctly identified the TC. You won't be able to check the affect on boost because boost was not logged.

National Motorists Association