Not sure FK. I just got my Helios and tried something similar however. I am replacing an XR3 pro and the following worked.
I left my 310 receivers in the cars and set thier pots to channel 72. Then I placed a 72 crystal in the Helios 75 mhz module. I got perfect reception in the "place the car on the p-dub stand and walk as far away as possible and see if you get a glitch test."
I saw someone ask if this would work a few pages back and wasn't sure if anyone answered it. Just an FYI.
A question however. I have a 12L4 and an RDX. I have 1 302 receiver. Which car would y'all preferr to have the faster reponse time in? Does it really matter? THX