Hi, this is my first post on here. I’m probably gonna start a log since I’ve got some interesting stuff on my newfound S6. However, I need your opinion this…
My OEM coils were fine, but I decided to swap to APR coils for the 10% of power gain they promise.
I thought it would be interesting to try to measure any results. I used the dyno app PerfExpert which has received good reviews and is supposed to be pretty accurate. It measures acceleration on a certain gear using the GPS and phone acceleration sensors, and calculates the power and torque based on all the car specs, gear ratios, the weather, fuel and driver weight etc.
Did some pulls before swapping the coils and it showed a pretty consistent 415 hp, and the next day with the APR coils only 395. Again, did several pulls which were all pretty close together. The car also felt subjectively slower.
Of course, it could just be an inconsistency with the app, different day, placebo etc, but I’m still pretty disappointed. I expected it to do nothing at worst, but to get an almost 5% reduction in horsepower is pretty dismal.
So what I’m asking is if you can think of any reason why these coils would perform worse than OEM, or do you think it’s just coincidence or unreliability with the measurements? Do you have experiences with the APR coils ?