---What size injectors?----
 

Well since my tune my injector duty seems to max out at 100% any time i drive the car to redline.... I want to up grade with the possibility of going single one day but probably not in the near future. what size/ setup would you recomend for this?

If you have to pass emissions, have your secondaries bored out to 1300cc by RC Engineering. They will drop right back in the OEM rail. If you need more fuel after that with the single, you could drop in stock secondaries into your primaries with minimal modification.

Alternately, if you do not have to pass emissions and can handle more intensive install, get an aftermarket secondary fuel rail, get some Bosch 1600cc injectors and a fuel pressure regulator and have a ball. You will need resistors to run the 1600cc injectors with the PFC. (Please search, tons of posts on it.)

In either case, you will need an upgraded fuel pump. And you will also need a retune after the pump and injector install.

Thanks,

I understand the ton of information but it seamed a little overwelming. I already have a 255 fuel pump and idont need to pass emissions so I guess Its time for the fuel rail, injectors and fpr!


thanks again for the info

Rynberg, doesn't 100% duty sound high for 277rwhp? I'm thinking the tune was done without checking fuel pressure and the high duties are compensating for pressure drop from a weak pump.

I agree Eggie, if he is hitting 100% at only 277, the tune is definitely compensating for weak pump. If this is really the case, the OP should upgrade the pump wiring, as per Dale's excellent thread.

Sorry i keep forgetting to take that sig off. I made 312 at like 7500 on that tune.... and I already had the fuel pump at that time.