Since I have a second 350z HR to mess around with. Trying to gauge your opinion on this. Converting a dual throttle body to single. Why? because it makes everything simple, plus if going boost less piping to mess around with and less headache when one of the throttle body goes bad. To me it seems straight forward. If my theory is correct. I have to join the signal wires from the Throttle plug to the other side and the same for the MAF plug. I am assuming both sides read the same voltage readings. I will be trying this on my other car to see if it will work. Any thoughts? If it does work Ill make block off plate for the right side throttle body to keep it closed. Reference image below.

 

Sounds like a counterintuitive move to me. Taking away the freer breathing aspect of the HR/VHR engine is kinda like cutting off one's foot to save on the cost of socks.

But, yer car.

 

 

Beyond being counterintuitive, why would you trust your opinion to be better than the vast R&D program Nissan used to develop the HR? Simple is NOT always better and this is not an area that will result in better performance. It's your stuff, but you're betting on your ego and I'd bet your ego is about to cost you plenty of time and money!

 

I haven't had both versions off the car at the same time so I couldn't say if the pass side feeds Bank 1 and vice-versa or they share/mingle sides for air intake. Reasons not to attempt this-
1) It's unclear how to manage the input to ECU from 2 throttle bodies.
2) It's unclear how your upstream O2 sensors will manage fuel delivery.
3) If you physically block the pass air intake and hack up the wiring and melt your ECU, you won't be able to have Nissan or anyone else bail you out $$$$.

I wouldn't recommend this ever.

 

So your idea of "simple" involves deconstructing how the intake system was designed by Nissan engineers? I'm 99% sure that the throttle bodies feed separate heads (as in three runners feed the left side and three runners feed the right), so you'd also need to design a new intake manifold that can feed all six from a single throttle body (not as "simple" as slapping on a single TB 350Z plenum). Then there's the "simplicity" of hacking up wires, dealing with turning signals to signal in the ECU (MAF signals, drive by wire signals, etc)... this whole mess is the exact OPPOSITE of "makes everything simple".

If you want to go single throttle for simplicity's sake, just swap in an LS. Would be MUCH simpler.