mcamarols1

iTrader: (9)

like the topic says
whats the stock fuel system limit of a 02 fbody?
hp limits i mean??

Ouija

iTrader: (3)

A stock 02 should have come with 28# injectors making it capable safely of 358HP @ 80% Duty Cycle, and a max around 403HP @ 90% Duty Cycle, due to the injectors, if you have an average tune. A good tune could increase those values a bit.

My understanding is that the fuel pump maxxes out around 400HP as well, but I have never calculated the lb per hour of the stock pump so I'm only going on second hand knowledge.

If anyone has any input or differing opinions I'd love to hear tham as I've tried to discuss this in other threads with little to no responses.

john563

iTrader: (17)

I have a 98 its cammed and in the process of adding more hp and wpuld like to know the answers to the limit of the injectors pump

Ouija

iTrader: (3)

From my current research Holley claims for their pumps:
155 liters (41gal) = 246lbs of fuel which is capable of supporting 491 HP
190 liters (50gal) = 301lbs of fuel which is capable of supporting 600 HP
255 litres (67gal) = 404lbs of fuel which is capable of supporting 800 HP
http://www.thunderracing.com/catalog...d=270&pcid=165

I think our cars came with a 180lph pump, but I'm trying to research that now.

Someone else has posted they think it's a 155lph stock, so I have no clue.

Google isn't returning any useful results, nor is LS1Tech's search...

Obviously if it's a 155lph it's capable of almost 500HP

MeentSS02

iTrader: (11)

The problem I'm having with the stock fuel system is the rail pressure drop as the load increases on the engine. It goes from 58 psi at idle (right where it should be) all the way down to 50-52 psi at WOT. This will drive your injector duty cycle up, and is why I had to go to 30 lb/hr injectors on my bolt-ons only car to get a decent duty cycle.

I wish there was a clean, somewhat simple way to get a regulator at the rails and do the return line from there. The only good thing is that the pressure drop is repeatable, but still, it isn't ideal.

Frost

iTrader: (45)

You're right, so if someone is actually happy with where they are at, the drop can be handled.

I'm gonna say with the original poster's 02, with M6/dynojet numbers that you will see the end of things between 420-440RWHP.

rich

I was tring to figure out a way to stop the bypass at wot under load. Like using an open solenoid and closing it at wot or under boost or on the button. any ideas?

mcamarols1

iTrader: (9)

thanx everyone so then i should b good w/ the mods in my sig, if any thing ill change the injectors right?

pushinfreight

I maxed out the stock system at 443rwhp and a 110% dc. you should be ok but that is about 80% dc for the injectors so you should look at a bigger set of injectors soon if you add any more power.

Frost

iTrader: (45)

110% from what I can tell is either an estimation or just some phantom; 100% is static.

pushinfreight

the reading was from LS1edit showing 110% but they were maxed out. I only let them do it twice. After the second run with the same results we stopped and I ordered bigger injectors. Most of the Fbodies locally once they go over 400rw have gone to bigger injectors as they are pushing 90-100% DC.