Originally Posted by RCGaryK

I have seen guys run caps on Keyence ESC's. I've even seen guys add power caps to older Tekin G12cIII's that were running 27mhz equipment. Again, it's to smooth things out and to provide more punch. A side benefit of running the power cap is it does help prevent the BEC output from dropping too low in high current drain situations, like when you accelerate. I've been running multiple power caps on ESC's since I first started running the GM V12WXC like 4 years ago, then with the VFS2000, onto the VFS1, QC2, GTX, and GTB. It's not that you have to run a power cap if you run Spektrum. It's a feel thing and I personally prefer running power caps on my equipment because I like the throttle delivery and acceleration with them versus without. Think of it as just another tuning aid.