Z28Camaro30Ann

iTrader: (15)

Question number one: What is the stock fuel pressure for a 97 LT1??? I just installed a Fuel Pressure Gauge, and mine is running 47-49 lbs right now. Is that normal or no?

Also, I have AFR heads...would it be better to go with ARP Head Bolts, or the stock T-T-Y Head Bolts???

LT1

iTrader: (1)

Stock fuel pressure is 43.5psi
Seems like your fuel pressure is high to me.

Should be around 41-47psi

Z28Camaro30Ann

iTrader: (15)

I know I have an adj, fuel pressure regulator on it, but I have no idea what it is set at...apparently around 48...is it bad to run such high FP with my setup, or is it ok?

dlk1950

Mine is at 48 since last fall,,,seems to be fine. nice looking car you got there.

Z28Camaro30Ann

iTrader: (15)

Thanks! That sounds good to me...as long as I dont end up with washed out cylinders or something lol.

Z28Camaro30Ann

iTrader: (15)

Now how about that head bolts question....anyone know???

myltwon

iTrader: (1)

best thing to do is put it on a dyno or get a wideband, a real A/F ratio reading will tell you more than a fuel pressure # as far as what is rich or lean for your setup

FYI stock fuel pressure is 40~ psi at idle and 43~ psi at WOT

Z28Camaro30Ann

iTrader: (15)

I run 47 at idle and 49 wot.

I am gettign a wideband next week...

koolaid_kid

iTrader: (21)

First, I prefer to run ARP head bolts. They can be re-used, whereas the TTY bolts must be replaced each time.
Second, altering the fuel pressure changes the output of the injectors, artifically increasing their size. IIRC, your 97 should have 24# injectors stock. The equation to use (borrowed from RC Engineering):

New_Flow_Rate = Old_Flow_Rate x sqrt(new_pressure/old_pressure)

[sqrt stands for square root. You probably knew that, but I just wanted to be complete.]

So, the equation would be:
New_Flow_Rate = 24# x sqrt(48/43.5) = 25.2#
Not really a significant amount, but if you were to increase it to LS1 pressure (58 psi) they would now flow 27.7#, which is a significant difference.

Unless you were needing to change the injector size in this manner, I don't really see what it will gain you by altering the pressure from stock.

Z28Camaro30Ann

iTrader: (15)

not trying to alter the FP...I WAS gonna get 30# SVO injectors for her, but I dont have that much power. Ill be between 400 and 500 when I'm done and stocks will be fine for that. I just wanna make sure my pressure is ok or not so I dont end up with problems...I think I am good with 25.2# for now lol. If I ever decide to supercharge it then I will worry about higher flow injectors and all...till then, im content...