Hello! Lt1 issues, rich but lean.

[steveo]

Is that as easy as installing the 30lb injectors, then setting the computer injector size to 30lb injectors? right now it has 24lb stock injectors, but its set to 24.57

assuming the new injectors are flow rated at 43.5psi, then yeah, that'll get you in the ballpark.

there's also the difference between n-heptane or gasoline flow ratings, which is a small difference, but it does make a difference.

depending on the level of ethanol in your fuel, you may have to account for that in your injector flow constant as well, since the stoich afr variable (if it exists) in EE is unknown.

then there's your offset table.

you should make sure before you buy injectors that a proper datasheet including a proper offset table is available.

30lb injectors are a bit big for a stock-ish engine, but will give you some growing room.

why dont you confirm this is the issue by doing a homemade flow bench? disable the ignition coil for safety then, hang the rails and put a container under each injector.

keep fire extinguisher handy

first just run the fuel pump to check for leakage. then just crank the thing until you get a good sampling. if you have one injector flowing more than the rest, you'll see it real quick in the jar.

you should also check fuel pressure and the other basics while you're in there

[92rslt1]

assuming the new injectors are flow rated at 43.5psi, then yeah, that'll get you in the ballpark.

there's also the difference between n-heptane or gasoline flow ratings, which is a small difference, but it does make a difference.

depending on the level of ethanol in your fuel, you may have to account for that in your injector flow constant as well, since the stoich afr variable (if it exists) in EE is unknown.

then there's your offset table.

you should make sure before you buy injectors that a proper datasheet including a proper offset table is available.

30lb injectors are a bit big for a stock-ish engine, but will give you some growing room.

why dont you confirm this is the issue by doing a homemade flow bench? disable the ignition coil for safety then, hang the rails and put a container under each injector.

keep fire extinguisher handy

first just run the fuel pump to check for leakage. then just crank the thing until you get a good sampling. if you have one injector flowing more than the rest, you'll see it real quick in the jar.

you should also check fuel pressure and the other basics while you're in there

Sorry, I should have specified more, its a cc306 cam, mild ported heads, 36mm TB, aftermarket ignition, hooker headers and 3 inch cat back. Tuned by a very reputable tuner who no longer offers lt1 services so I'm trying to learn on my own. It ran amazing before being parked, it had stock fuel pump in it then too. When I started it up after its 5 year slumber it ran terrible, was missing several cylinders. I took the injectors out and soaked them over night in carb spray and blew air through them and when I reinstalled them it ran good. It now has a walbro 225 with stock regulator still. It actually still runs really good, but is too rich and lopes a bit more then it should at times. I'm leaning toward the injectors being suspect. I will try to get them to flow like you said and see what happens. My friend has a snap on scanner that will fire injectors, so I will try to rig up a pump and clear glass tank to spray test.

[92rslt1]

Well I pulled some of the plugs today and much to my surprise they look OK to me. I expected them to be black.IMG_4088[1].jpgIMG_4087[1].jpg

[steveo]

that is on the rich side for sure but not enough where it should make your cat glow?

not that i'd know, i never run cats on builds like that.

still with all those issues you should replace them, injectors need to be perfect.

keep in mind there are lots of ways to make a cat glow like that, not just sketchy fuel injectors....

[92rslt1]

that is on the rich side for sure but not enough where it should make your cat glow?

not that i'd know, i never run cats on builds like that.

still with all those issues you should replace them, injectors need to be perfect.

keep in mind there are lots of ways to make a cat glow like that, not just sketchy fuel injectors....

I know what ya mean about the Cat, it is becoming a pain. With modern day Cats I didn't see a reason why not to run one though. I hate the smell of a cammed up car without cats and my last build had no cats and every time I got out of it I would smell like I just mowed the lawn.

Did you write the Raspberry pi code? I clicked on the link in your sig and was pretty excited to see that. I have a pi that's been collecting dust on my desk, I wanted to make a fuel injector pulser with it just for fun, but just haven't gotten around to it.

[steveo]

Did you write the Raspberry pi code?

yep, sure did

you should build one, it works out of the box with your car..

http://fbodytech.com/aldlrpi.html

[92rslt1]

yep, sure did

you should build one, it works out of the box with your car..

http://fbodytech.com/aldlrpi.html

That's awesome. I'm going to order up the parts. Is it possible to display the air fuel ratio too?

do you know what type of operating system the PCM runs? I was trying to figure out what functions I could use to write a c program that would allow me to pull the memory off the PCM... Kinda like winaldl does. But first I needed to figure out how to establish that communication.