injector problem Options

[pabel89]

hey today i put my 315cc lime green supra injectors also the walbro fuel pump when my mechanic was done with the car i took it for a ride and everytime im doing about 4 to 5000 rpm in any gear the car starts losing power and it starts making tht noise when ur sparks plugs are wet...my mechanic said it can be two thing i need to buy stronger spark plugs oobe suggested the ngk v power...also i didnt put my fuel pressure regulator so i was thinking it might b tht...let me kno what u think??

[6strngs]

yeah, if you're running bigger injectors on the stock ECU, the ECU doesn't know that they are bigger and thus sends out the same length pulses to the injectors, even though smaller ones are now needed because more fuel comes out in the same amount of time with bigger injectors. For low throttle cruising you'll be fine, since the ECU looks at the o2 sensor and will see that you are running rich and lean it out as much as it can, but under WOT the ECU does not look at the o2 sensor at all and you will run very rich and have way too much fuel and sputter and choke at high rpms. you need to either tune the car, which would waste money because you are going to need to tune it again after the turbo is on, put your stock injectors back in until you put the turbo on (this would be the best idea), or stay under 80% throttle at all circuimstances. it has nothing to do with the spark plugs although you do need the step colder ones but they should be installed at the same time as the turbo!