On the road testing is notoriously inaccurate. You don't feel power so much as you feel change in torque versus time. If the car feels stronger up top, that likely means you are noting a surge or increase in power at a certain point. This is just as easily attributed to making LESS power down low as it would be to making more up top. This is the same sort of "feeling faster" that all of the OBD-II track pipe people experienced. Same peak power, less midrange, and thus the car would have a much larger slope in the power band between the midrange and the high RPM range of operation. This is why the butt dyno should never be used. If you are going to try to make more power by messing with sensors, then do so with proper test procedures in place. A wideband to verify the AFR, as well as a timing light to check for any changes to ignition timing from changed load readings, is really required. The before/after tests should also be done on a dyno with the variables as controlled as possible to verify the change in power.


If you are going to try to make more power by messing with sensors, then do so with proper test procedures in place. A wideband to verify the AFR, as well as a timing light to check for any changes to ignition timing from changed load readings, is really required. The before/after tests should also be done on a dyno with the variables as controlled as possible to verify the change in power.