ORIGINAL: elenasgrumpy
As soon as I started burning it I noticed that all my OS .46's & my Tower .46 seemed like they needed to be re-tuned or something. It felt like I lost the top 20% of my power-band.
That's because they did need tuning! Yes, you will get more top end power with higher nitro, but any time you change fuel, you need to retune your needle valves to get the best performance from the fuel you're using. If your engine is tuned to burn the 10% fuel, and you change to 15%, it won't run right until you retune, either.
Phil