when I install a 603ff rx into any of my nitro 1/8 scale rigs the servos twitch and jump around real bad, but if I put that same RX into an electric powered car it works fine! what is the deal with this? I only have one of the 603ff rx all the rest of mine are 603fs. I dont think it is a noise or heat problem because the nitro car dosnt have to be running for this to happen. I am also using a 3PKS tx. this has me puzzled

Do any of your 1/8 cars have carbon fiber near the Rx? They suggest installing away from CF to prevent reception/glitching issues.

Yes, But so does the electric

Any other ideas?

If your servos are not digital the reciever needs to be in normal mode not hrs mode.

Good call. I ran into that when I had a digital in my buggy but not the truck. I'd forget to switch modes when I switched models and it would go haywire.

all ready checked that! both cars have the same servos. Futaba said send it in with TX module for check up but I cant go with out a radio! I wish they would send me a loaner. I have a busy rc schedule! take this weekend for example Fri night=onroad, Sat=offroad, Sat night=rock crawl, & if I can find some action withen an hour away tomorrow, its on