The 700's ECU is an open loop system, it's not a subjective discussion it is a statement of fact that the OEM system as it ships from the factory does not have the ability to automatically (without input from additional non-OEM sensors or controllers) compensate for intake/exhaust/engine modifications. All of the atvs on the market from major manufacturers that I can think of from the top of my head function the same way. Only recently have some of the on-road motorcycles switched to closed loop systems that can make these kinds of adjustments. Cars have used closed loop systems with oxygen sensor feedback for making these adjustments for decades.
The 700R, like other EFI atvs, is equipped with an intake air pressure sensor which monitors the atmospheric pressure and therefore can compensate for the thinner air at higher altitudes. While we're on the subject there is also a sensor for intake air temperature, which is why you don't have problems starting it when it's cold outside.
Now I have heard from some who have bought the GYTR products that they took their atv into the dealership (or had it done before they picked it up) and the dealer flashed the ECU with a different map specifically made for the GYTR pipe and that only the dealerships had this capability to do so. I haven't experienced this myself but it sounds plausible and would explain why Yamaha doesn't see the need to offer their own aftermarket piggy back fuel controller since they can affect the same change with just a software flash. This new map wouldn't compensate for changes either, but it would be pre-tested to provide the additional fuel required for the GYTR setup.
There was also a thread a while back where the 09+ models were able to be put into some kind of diagnostic mode which enabled at least some form of interface or viewing of what appeared to be the EFI map settings. I do not know much about this but do recall it was a surprise to me at the time. I have no idea if or how these can be manipulated and what the impact is when you do so.
Just trying to clear up some confusion, if you think I've got something wrong here or it needs clarification please feel free to chime in.
The 700R, like other EFI atvs, is equipped with an intake air pressure sensor which monitors the atmospheric pressure and therefore can compensate for the thinner air at higher altitudes. While we're on the subject there is also a sensor for intake air temperature, which is why you don't have problems starting it when it's cold outside.
Now I have heard from some who have bought the GYTR products that they took their atv into the dealership (or had it done before they picked it up) and the dealer flashed the ECU with a different map specifically made for the GYTR pipe and that only the dealerships had this capability to do so. I haven't experienced this myself but it sounds plausible and would explain why Yamaha doesn't see the need to offer their own aftermarket piggy back fuel controller since they can affect the same change with just a software flash. This new map wouldn't compensate for changes either, but it would be pre-tested to provide the additional fuel required for the GYTR setup.
There was also a thread a while back where the 09+ models were able to be put into some kind of diagnostic mode which enabled at least some form of interface or viewing of what appeared to be the EFI map settings. I do not know much about this but do recall it was a surprise to me at the time. I have no idea if or how these can be manipulated and what the impact is when you do so.
Just trying to clear up some confusion, if you think I've got something wrong here or it needs clarification please feel free to chime in.