Map sensor missing link and fpr ?

[g2nickle]

I need some clarity. Ive heard that the stock map sensor can read up to 12psi of boost. But Ive also heard that it cant read boost, because obviously your not reading vacuum on a FI car, since it is under pressure and that is why you need to run the missing link to block the vacuum line....does this make sense what im saying? Or am I just confused? Im going to be running larger injectors with a re-chip and a basic turbo map with a walbro255 in tank pump for management for now. Will I need to run a missing link? How does that work? Also, do you need a fuel pressure regulator that can read boost since they have a vacuum hooked to them?

[ksniperfox]

Originally Posted by g2nickle

I need some clarity. Ive heard that the stock map sensor can read up to 12psi of boost. But Ive also heard that it cant read boost, because obviously your not reading vacuum on a FI car, since it is under pressure and that is why you need to run the missing link to block the vacuum line....does this make sense what im saying? Or am I just confused? Im going to be running larger injectors with a re-chip and a basic turbo map with a walbro255 in tank pump for management for now. Will I need to run a missing link? How does that work? Also, do you need a fuel pressure regulator that can read boost since they have a vacuum hooked to them?

you are confused. SOME stock b16 map sensors can read about 12 psi, i believe its the obd0 one, not 100% sure. but let me explain:

1.)a missing link creates a space between your MAP sensor and your intake manifold so that it cant sense the boost. since most honda sensors arent designed to 'see' positive air pressure in the Intake manifold, they turn on a check engine light under boost and causes it to run a little off. the missing link blinds your sensor to the boost with this spacer/spnge material inbetween. this device is typically used in LOW boost applications, with a FMU(fuel management unit/rising rate regulator) in place to compensate the extra air with more fuel, since the MAP sensor is incapable of sensing the extra air and compensating for it.
2.) larger injectors and/or an aftermarket fuel pump depend on how much extra air you are flowing that need more fuel. do not just put on larger injectors and assume your engine is getting the right amounts of fuel/air. your ECU does not know you have larger injectors. it thinks you have the OEM 240cc or so ones, and if youre using 350cc, that just means an ASSLOAD of fuel is going to spray and your car will likely bog down at idle or under light throttle.
3.)there are aftermarket MAP sensors, and GM map sensors that are designed to read boost. use one of these in conjunction with a chipped ECU and your car is now 'reading' the boost and now, it 'knows' how much fuel to add, sort of. it will know how much fuel to add by the a/f maps that are programmed into it. those maps are programmed by a professional tuner. there is no 'basic turbo map' that your car can safely run from if you put on a turbo.

if your engine can handle the extra boost and you want to increase it, then you may want bigger injectors and eventually a better pump.