GT35thconvertable

Can I install my 42 lb injectors & 255 lph fuel pump with no other tuning or modifications until I put my sc on.

Matts00GT

I'd say no...If you dont get it tuned for 42lb inj. then you will be getting too much fuel and not enough air.

GT35thconvertable

but wouldnt the computer tell it how much fuel not the injector..I thought the injector just was their when needed but the computer told it when to flow more fuel

99REDGT

I think you need a tuner to program for that injector size

racer02GTstang

thats partially true but not in this case. your MAF is calibrated for your stock injectors, so if you put some bigger injectors with the stock maf, the stock maf will say to open this much and you will be opening the injector the same but the injector is bigger than the other so it will flow more than the other and the computer cant control this. if you got a lightning maf and the injectors, it could work... but i dont know if you will be running rich or not still. 42lb injectors is alot of fuel for a stock motor...... you can add the pump without the injectors though and be fine... thats what i did when i was gettin ready to put the blower on.

SilverGTV8

I am guessing you have a 35th [8D] so installing the pump will be fine because it is a return style system.

The injectors would be a bad idea until the blower because of the state calibration issue.

Changing the injectors at teh time of the blower won't take more then a 1/2 hour longer. You'll just have to depressurize the rails remove the old injectors and install new ones and install the fuel rails. Not overly hard.

I would how ever recommend a pressure requlator in the mix to monitor the system.

redfireshaker06

There is no aftermarket fuel regulator for 99-04 it will need to be controlled by a chip/tune. And is the 255 for a returnless fuel system? If not, it won't last very long.

SilverGTV8

Sorry I meant sensor not regulator

http://216.242.145.16/products/product.phtml?p=100

My math was bad to 98 was the last year for a return system.

I would don't either now just do it with the blower install.

Voodoo

No the 42# injectors will not work unless the computer is reprogrammed. Even with a MAS that is calibrated for 42#. It will run but very bad. I know this because I put my stock tune in one time because my Predator crashed out on the road. Had to drive the car home and barely made it. When I first put my blower on I got a temperary tune so I could drive it to the dyno. If you have a SCT xcal-2 you can plug in the MAS and injectors right off the bat and it will run fine but don't get on it untill it's tuned.