man, yall are confusing ...and confused... im running 405cfm and 450cc injectors on a corksport ecu... and on the wideband i dont see above 13.0 at any given rpm ... if you are burning stupid amounts of fuel then the ecu is not the issue ...as it does the same thing at a given rpm and psi.. wether you have 300cc inj. or 450cc inj.. the pulse coming from the ecu is the same... its how much fuel comes out each time a pulse occours...therefor fuel pressure takes play...
an injector rated to flow 300cc does it at a certain fuel pressure... lets just say 32psi pressure for a base...a 300cc injector that squirts 300cc fuel at 32psi will squirt like 350cc at 42psi does that make sense???
so you may be running a 300cc injector but if you bump the pressure you can make the injector push more fuel...
this is how we turbo honda civics with there little 280cc injectors to the tune of 8psi...
now to lean out a big injector you lower the pressure... yet this can lean you out up top...
so how do you get a bigger injector to push the correct amount of fuel down low, yet be rich enough up top not to lean out???
lets think about what controlls the engine guys... you have an ecu whitch reads and calculates how much fuel your engine needs at a given moment using information given to it by a list of engine sensors... the second most important of being the vein airflow meter...
basically this tells the computer how much air is coming in the engine hence how much fuel it needs... if you strap a bigger turbo to the car the airflow meter is then opening faster due to the draw of the bigger turbo... smack the throttle and the afrs will plummet as the ecu sees alot more movement of the flaper due to the bigger turbos air draw....
so how do we change this?
if the ecu sees a flapper open to 75% at 1/2 throttle it uses its maps accordingly and injects alot of fuel... becuase at 75% thats alot of air...but your only giving it 1/2 th.
floor it at say 3,000rpm and the flapper opens up all the way...so now you are at 4,000rpm with the ecu giving you full fuel load... this is correct.. at full throttle... but at say normal 25 -35% throttle the big turbo opening the flap too far gives you too much fuel and makes the fuel mileage suck...wideband act silly and your plugs turn black...right???
so how the fuck do we change this?
you added more suck to your intake with the bigger turbo.. you need to add more resistance to suck with your flapper yall...
the meter is key... it is oldschool, and is easilly manipulated...
WARNING: WE ARE ABOUT TO MESS WITH STUFF THAT MAZDA NEVER INTENDED AND CAN FUCK YOUR SHIT UP
I HAVE DONE THIS A BIT AND CAN HELP YOU ACHIEVE, WHAT I HAVE THROUGH TRIAL AND ERROR... PLEASE WHEN I SAY "NO MORE THAN" OR "BECAREFUL NOT TO"
LISTEN TO ME .. IM NOT JUST SOME ASS WITH NO IDEA WHAT IM DOING... IT TOOK SOME MESSIN AND SOME RESEARCH TO DO THIS....
ok take the black plastic cover off your airflow meter, to expose its inside workings...
you can basically see the meter is a big potentiometer.. as airflow pushes the flap open it turns the "volume" up on the fuel...
thares a coil spring that makes the flapper return..you can see it coil as i open the flapper above... if you want the car to lean out down low you need to tighten this spring so as the new "bigger" turbo opens the flapper as the stock one did...but how do we do that???
well the coil spring is attached inside a gold ring that has teeth all the way arround it...
thare is a keeper spring arm to the right of it that keeps it from spinning back and loosening the spring tension...
what you want to do is spin the ring clockwise 3 or 4 teeth. NOT MORE THAN that or you will lean it out too much (over tighten it) and you need to BE CAREFUL NOT TO crush the ring in any way ..it is soft metal and is vital to proper tension of the spring...
i used a small screwdriver and carefuly pushed it past the keeper 4 clicks ...
this will make the meter more acurately read what your big turbo is doing and straighten up your fuel economy issue also make the power smoother ...it still does the same thing at full throttle but it smartens it up getting there...
make sense... now everyone knows my secret to running 450cc injectors and a big turbo acurately with a corksport ecu on a b6t
DO THIS AT YOUR OWN RISK AND I AM NOT LIABLE IF YOU FUCK YOUR OWN CAR UP... BUT this is what i did and it works great ... remember im making over 200hp yall...be good and your welcome...enjoy...Joe..RCICustoms...