fuel pressure w/52lb injector question

[iangoround]

How far back can I dial the pressure on my 52lb injectors? I need to do some serious electrical troubleshooting and want to switch back to a stock calibration and MAP. I don't have any 33lb injectors to swap out so I was hoping I could just turn the fuel pressure down to around 20psi or so to approximate stock injectors.

I don't need it to be able to do much more than idle and free rev in the garage while I sort things out.

[shadow88]

The lowest I could get was about 27psi. It's close enough for everyday driving, but a little rich at idle with a stock computer and +40's

[iangoround]

I guess I'll try it and see what happens. Like I said, i don't need it to drive. I just need it to idle without dripping fuel out the exhaust and ruining my oil while I do some troubleshooting.

[4 l-bodies]

24-26 PSI (static) will put you just over what a stock 33lb injector would be. 34-36lbs. Some adjustable fuel pressure regulators can be the limiting factor. If you have better than stock flowing head and manifolds you will probably need a bit more fuel than that.
Todd

[Dave]

Try it out, but you may run into setting it too low and the fuel wont atomize and the car wont start.

[iangoround]

I got it down to 20psi at idle with the vac line hooked up. It starts to break up after that. I guess that will do for my purposes.

[shadow88]

That's probably about where mine is at too, but I always check with the vacuum line off. It's not so rich that it's dripping out the exhaust, just around 11.0:1

[iangoround]

I just tried 20psi static, and it was stumbling and stalling. That may be related to the issues in my other thread though.

[black86glhs]

Turn it up to 25 or 26 psi and see what it runs like.