Blake01SS

iTrader: (24)

Alright fella's, Im having some problems with the Camaro and was needing some input on fueling questions from people who know more about it than i do. Well, Rhino79 and I went out to tune my car about a month back and come to find out my car is running lean past 5k RPM's (loosing fuel pressure). That being said I called Bob at EPP (Who was extremely helpful once again) and he suggested to change me Fuel Filter (being it was the original with 55K miles on it). So once that was done I went out for a test run and my fuel Pressure was fine at 60lbs under WOT. Back to Rhino79 I went again, this time It was the same deal with the Injector Duty Cycle running at 195% (while still running lean past 5K RPM's)! Now, onto my questions...

1. Are my Injectors big enough (Green Top SVO's *42lbs*)?
2. Do you think its just my STOCK In-Tank pump being sucked dry by my In-Line Pump (And that I should just replace it)?

New Mods are (Keep in mind the car ran Flawless before these)
*AFR225cc Heads
*EPP's Blower Cam
*Upgraded to the 8 Rib set-up on 10-12 lbs of boost

HELP ME PLEASE!

99camarosupersport

iTrader: (6)

My first guess would be that those injectors are too small. I don't think it would be your pump if your constantly running at 60psi under full load, then again I could see it happening.

Blake01SS

iTrader: (24)

Best I remember, we only ran it hard twice with the Fuel Pressure Gauge in it. I had my buddy watching the Gauge (I had to watch the road), so it very well could have dropped a little. Is anyone else running Similar Mods (estimated 550hp or so) with the Green Top SVO's?

Thanks for the help, Blake

stevieturbo

You dont say what blower, if if FP is boost referenced, so I'll assume it isnt.

So you have 60psi-12psi of boost which is leaving you with 48psi of usable fuel pressure. Combine that with relatively small 42lb injectors....
Then you dont mention what pumps you are even using ????

So yes....its no surprise its running lean.

Frost

iTrader: (45)

Dude... AFR 225s, EPP's cam, and 10-12 psi is going to make more than 550rwhp and can't be fed with 42s. ClemsonDave's car made more HP than that on his stock LS6 at 7-8psi with a P1; as have others with stock LS1s and less boost, so I am sure you will doing better than they. If you have that setup on a stock shortblock, I'd start talking to EPP about a bottom end. Not only are you past what those injectors can flow, but the issue of emptying the bucket because of that inline pump are very highly likely as well. Personally if it were my car, I'd look at a boost referenced regulator, 60lb inj, and 2 intank pumps. If it were mine I'd run meth too, but that's something else.

Blake01SS

iTrader: (24)

StevieTurbo...Kinda lost about what your talking about...

Frost...Thanks man (replied to your PM)

So does everyone agree it would probably be in my best Interest to go ahead and get the 60lb Injectors and Get a new In Tank or two?

Thanks, Blake

ALTRDTA

iTrader: (69)

Yes, very much agreed.

stevieturbo

Simply put...

You havent explained enough about your current fuel system. But what you have explained, tells me it is totally inadequate for your project.

Jake@EPP

For that kind of power, a ad on inline pump is worthless for the most part.

You will need a walbro 255 for around the 550hp level, and 2 of them for anything above that. Keep in mind that 550hp is borderline safe if you rag it pretty good, don't be surprised when parts start breaking, its just the name of the game with stock parts.

With the AFR heads, and our cam, you will need to probably build the bottom end soon.

Its a good excuse to go faster

Blake01SS

iTrader: (24)

Thanks alot fella's. I guess EPP will be getting a call from me with-in a day or two. Jake, where have yall been? Tried calling a few times this week (getting ready for the LSX Shootout I suppose?). Anyways, Thanks alot for the help fella's!

Blake

Jake@EPP

Yep, we ended up staying late untill 12:30am on thursday so we could shake it down at the RPM transmissions Track rental on friday morning. Ended up doing a 10.50 first pass with zero traction on the 60ft.

Anyways, give us a ring. This week shouldnt be as bad, just change converters and get it buttoned up for memphis!

EPP

iTrader: (22)

Give us a call. Tony, Diane and myself will be answering the phones. Thanks. Bob

DarkFormula

iTrader: (80)

Ditch the in-line booster pump, it can't flow enough to keep up with the in-tank Walbro and becomes a restriction. I JUST ran into this a few months ago, and dual in-tanks knocked that **** out quick. 12.7psi on a P1, FYI, and made 546rwhp...

Blownramair

Damn... I have my 65mototron's almost MAXED @ 60psi of fuel with a D1 @ 12-14lbs...

SHE WANTS SUM FUEL!

J