Anyone know the size of the NA injectors? And how much boost I could run with them and a 12:1 FMU?
NA injector size?
- Thread starter RIPDOTCOM
- Start date
Most OEM injectors, particularly small ones, don't show much if any flow improvement above 60 psi of fuel pressure. With a 12:1 you'll be getting 60 psi of fuel pressure around 3 psi of boost. If you're relying on a 12:1 FMU your fuel curve will go from stock a/f ratio, to pig rich then it'll start to come back down as boost increases. Unfortunately you'll lose injector control around 80 psi of fuel pressure (or 5 psi of boost). The excessive pressures will also cause the injectors to fail prematurely.
Stock injectors are 330cc/min, enough to support ~280 hp at sock pressure @ 80% DC. There's plenty of power to be had at stock pressure levels with a piggyback. I'd call the upper limit with a piggyback 9 psi, assuming you've got everything else sorted out.
Stock injectors are 330cc/min, enough to support ~280 hp at sock pressure @ 80% DC. There's plenty of power to be had at stock pressure levels with a piggyback. I'd call the upper limit with a piggyback 9 psi, assuming you've got everything else sorted out.