Question about fuel injection from a newbie

[Signman]

Try replacing you O2 sensor they do go bad due to the leaded fuel. Also location should matter at low RPM but upstairs should not be a big influence unless you have a header leak, make sure there are no leaks at the flanges.
Raising fuel pressure should richen across the map but the ECU does not know it, it's best to add fuel by editing the table.
The internal data logger works pretty well for tuning when you indicate an area on the log open tables will show which cells are being used. Tables should have there dashboard closed for this to work. use percentage to make changes: the difference between actual and target O2 in percentage is added or subtracted from number in cell.

MOST Important: Always save your base file where you will not delete it.
Always save your tune with a unique file name when making changes (facility;date;run#). Much easier to go back where you were if the change did not work get lost which is easy.

You should be logging RPM, Fuel, Timing, O2, Voltage at least.
Cells are divided in RPM increment usually 500, in the data log select RPM range in high gear for a suspect cell. This will then give you averages on the dashboard below, have the fuel table open with its' dashboard off, cell being used in fuel map will be indicated. Make changes then make another run.

[Glenn Briglio]

How many and where are the O2 sensors located? Headers? Collectors sealed to primary tubes? What duration cam at .050?

[Kdw1403]

1 o2 sensor. Located in the collector up close to where headers slide in. Would 42 or 50 or even 60 lb injectors be ok to upgrade to?

[Kdw1403]

Cam 268@50. No exhaust leaks anywhere

[Kdw1403]

I just made a street outlaw pass down the hi way in front of my house with data logger monitoring fuel pressure. I set it at 60lbs, left the line easy and got it in high gear real quick then nailed it. Data show instantly fuel pressure dropped to 25 and stayed there till I let off at 6700rpm. Pressure went right back to 60. Pretty sure its the fuel pump or filter. Since I am new to fuel injection is there anything else that can cause this? I don't think so but again I never thought thought a President would say that its ok for men to go into the womens bathroom. Thanks

[Ed Wright]

Listen to Cooter. Your injectors are big enough. You need to worry about your fuel pump, and filter. Your fuel pressure should not drop off like that. I use 36lb injectors in my Super Stock LT1, at 60 psi.

[Painter]

I am really thinking that we might have a plumbing issue.

[GUMP]

Originally Posted by Kdw1403

Data show instantly fuel pressure dropped to 25 and stayed there till I let off at 6700rpm.

You need to fix this first. There should not be the voltage drop that you have reported. You will burn something if you continue to run things with this problem.

I am assuming that you have your regulator plumbed after the fuel rails and that you are running a return line?

[Ed Wright]

I didn't think about him maybe having the regulator in the wrong place. HAS to be AFTER the fuel rails, controlling return only.

Surely his battery or batteries is/are in the trunk. I let my FAST ECU control my fuel pump relay, just like a factory vehicle. My relay is back there too. All 10 gauge wire from my batteries to the relay, then to the pump, and a ten gauge ground from the pump back to the battery's ground terminals. My batteries are grounded directly to the engine, with a long, large gauge ground cable. I have a ground cable to the body too. My battery cables have all terminals soldered on. I've logged my fuel pressure. Never changes. Solid at 60 psi.