We need some of the more experienced folks ariund here to comment, but I am in the same boat as you. Although I am just upgrading to X-speed. I have two STs and two nanodragon 2s. The electronics on the nanodragon 2s are awful so I am upgrading electronics. At $65 delivered for stck Kyosho electronics it would have been better to just buy a mini inferno stock if all I wantto do is play and not upgrade. But upgrading s the fun and I am just learning.
So I just purchased a new ESC and a separate receiver. I chose the Mtroniks Viper eco20 which is waterproof and can handle 8 cells. I got it from dinball (RC Mart) off of ebay. I decided just to go with a Hitec receiver so that all is compatible with the stock Kyosho or iWaver Tx. Total cost$63 delivered for the esc and rx.
For brushless you have to use a brushless compatible esc from my reading here. This means you will also be upgrading the receiver away from the stock esc/receiver combo. Then you have to insure compatibility with your Tx or you may have to upgrade that. Many Rxs are compatible with your Kyosho Tx so not a problem.
Anyways - the delivered cost of the mtroniks esc and hitec Rx is like $63 and the mtroniks esc is supposedly waterproof. So a balloon on the servo and recieve and should be able to handle light wet conditions on grass. We are upgrading in part to be able to play a little on on our backyard short grass.
After I assemble my first system and actually show I know what I am doing I will consider a more dramatic upgrade to the other Nano and STs. One thing I want to do is document all the speed changes with different upgrades so I truly understand the relative impact of the different upgrades.
Steve
AOL Screen Name: SteveR1960 buzz me if you want to chat RC
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