throttle pressure
was you able to ask at sema about adjusting the throttle spring pressure especially for the dual power adder set up
That is a subject that you will probably never get Fitech to advise or comment on. Too much liability for safety and warranty. They may make a design change to newer units, but that won't help you. My advice is to use the big hole with a very stiff or metal bushing. This is how I got the right throttle feel. Now with a dual unit I understand that there is twice the spring. You might, at your own risk, try modifying or unwinding one or both the return springs.
I hope you understand the C.Y.A. in this situation.
I know this post is old but, on the blowers you can not take both main springs loose, I tried this and the blower will surge due to not enough spring pressure on the throttle blades. what I did was take one main spring loose and leave the other hooked up, much better but I also run a custom length pedal assembly to help.
i am running two throttle bodies in line i am using the large hole and a quality linkage set up from the blower shop and i am using a lokar throttle cable to the stock pedal and it is hard to press it moves smoothly i will try to unhook one of the springs and see how that is
Be careful of that, the main spring became weak enough that I had a surging and high idle issue, ended up hooking the other spring back up.
I am only going to do 1 spring or try and see if I can unwind it 1 turn