You can not be a mechanic. What do the injectors have to do with you hittin boost cut? I have an idea search and here is the hit "AFM" and the type we have is called a karman vortex ......
People are making 400+rwhp on the stock 440's.
found something .... i searched yahoo for 7mgte karman vortex and after a few second i found this
http://www.novogate.com/exco/thread.php?forumid=15002&threadid=103821
Myth 6:
Fuel cut woes
Fuel cut, or technically ignition cut is a protection system used in the 7M-GTE and numerious other Toyota
engines. Unless we get information directly from the Toyota development team who designed and built the
7M-GTE, no one really knows the precise reason why fuel cut was implemented and why it triggers at certain
boost and RPM levels.
One reasonable purpose of fuel cut (actually ignition cut) is to circumvent excessive turbo boost pressure.
This will protect the turbo from reaching excessive PSI levels in case the actuator or related parts fails.
Many would argue that the conditions that trigger fuel cut is set in relation to capacity of the stock
440 cc injectors. Yet given the known injection duty values and combined with the flow rate of 6 x 440 cc
injectors - the reasoning is preposterous.
Considering that parts fail over time, some kind of mechanism is needed to protect the engine. Toyota has
no legal obligation to allow their production engines produce as much power as the parts allow, but
they do have the obligation that these engines produce the rated 232 HP give or take 5% of this figure, and
that these engines remain fit for purpose through their warantee period.
So this means that fuel cut could have set to be triggered at a lower boost @ RPM level, say for example:
just above 8 psi @ 5600 RPM had Toyota wanted to, although it doesnt mean that the engine cannot handle the
extra PSI boost level, more likely to the reality that not all actuators and wastegates, CT-26 units,
intercoolers, the pipework, air flow meters of the thousands of 7M-GTE's out there all function exactly the
same, some reasonable tolerance needs to be applied to take this into account.
Fuel cut often is triggered when the AFM values x RPM + air temp & altitude readings accumulate past a
set point seen in the ECU. Often people would think fuel cut is merely triggered by boost, but that is not
the case otherwise 13 PSI would trigger fuel cut as soon as these pressures are reached regardless of what
gear and RPM you are in.
It is important to realise this "trigger value" whenever using the Toyota ECU at any state of tune. The
most extreme examples of modified 7M's using the standard management system often manipulate the AFM signal
as far as it can, this is the only parameter that can be reasonably adjusted without causing running problems
and avoiding fuel cut at the same time.