I couldn't find anything using search. Does anyone know what fuel pressure the stock injectors for an 07 cobalt SS 2.0 opperate at? I am needing to tune a car for the 60 and have a conversion table in excell ready to go but I need to know the stock opperating fuel pressure.

 

there 34lbs i think. i chould be wrong.

 

34 lb/hr is the flow rate. the fuel system is pressurized at 58psi static flow

 

static flow? whats that?

 

sorry. static flow was the wrong choice of words.
static flow means not under vacuum or boost. a term used primarily when dealing with vacuum operated return fuel systems. ours has a returnless fuel system, where the pump tries to maintain a constant pressure

simplified answer, our fuel system operates at 58psi

 

oh thanks learned somthing new.

 

no problem d00d

 

cool same as all the LS1s I tune. Thanks guys

 

How would you go about measuring the fuel rail pressure?

 

go to autozone, buy or rent a fuel pressure gauge. it threads on to the shrader valve (black cap, on feed line above fuel rail) if you have an ss/sc you need to take off the black rail cover.

 

Happen to know if hp tuners will read it?

 

HPT wont read fuel pressure at the rail.

 

Ok. Thanks.

Do I have to buy one of those full on 300 dollar fuel pressure gauges, or can i buy a unit for measuring the pressure similar to a tire pressure gauge? What I mean is can i get something less elaborate that I can just slap on there while the car is running to make sure fuel pressure is right?

 

fuel rail pressure is 58psi according to the documents ive seen on gmpowertrain

 

Yeah. I know what the rated fuel pressure is, I am just not certain that mine is running there. After tuning every which way, and it still runs scary lean, and really weird. And a buddy of mine has mods very similar to me, and runs really rich.

 

58-63psi

depandant on the car

 

you can log it in HPT is you wire in an external I/O for a FPS.

58psi is normal pressure.

 

my gauge was $26 at autozone.
HPT will log just about anything if you set up an external I/O, but i thought he was talking about having a PID for it.

neo01, what mods do you have and exactly how lean is your afr?