So the T4 I bought to get back into racing came fitted with a Bruno servo

A BR1-T4 WC v1 to be exact.

I’ve tried searching on the site but can’t find much info on the servo.

The site lists the servo as having a Bec voltage and speed at 6.0v. Can I set this higher?

Also I’m running it with a NB4 Pro, it says it’s digital but nothing mentioned about optimal frequency/hz.

Any info or advice here would be appreciated.

Or do I just get a power hd s15

this is 6V servo, but if you use LiFe bettery, you could use in 6.6v , the frequecy 333hz

i believe this is the best servo for T4

Eh??????????
You know the T4 is an electric car so no use of a receiver battery?
The BEC of most ESC's is set to 6v but there are plenty out there that are programable to other voltages.