Ok, the LE2 kit is going in soon. I have a stock tune and stock injectors. Should I get a tune and swap injectors before the initial startup?

 

i would without a doubt get some bigger injectors and a tune to go with it, but for initial startup you might be able to get away with stock injectors

 

Your stock injectors are fine, no need to upgrade them right now. They're good for almost 500 HP, which you're not near.

The car will run with a stock tune, but you're going to want to get that tune soon.

 

BTW, here's a vid of my car with fully ported and polished heads, and a cam about the size of a LE2/comp 503 cam.

http://www.youtube.com/watch?v=k5JkVohD_B0

That's with stock injectors and tune.

 

Good vid. And yes, I will be getting bigger injectors probably 36# SVO's. I just really don't want to screw anything up, even a little, by running it without a tune. I read a couple posts about fouling the plugs and some other little problems that resulted from running an LE2 without a tune. Maybe I should mention that my cam isn't the actual LE2 cam, it's a Comp Cams custom grind, .510/.520, I don't know how that compares to the LE2 powerwise, or if it matters, but just so you know.

 

I would just save a bit and get some injectors and a tune. 30# SVOs will be fine for an N/A LE2 setup, and the tune will help a ton.

Best case scenerio is that it will run crappy, but with stock injectors and tune on a HC setup you can damage your engine...I wouldnt risk that to save a couple hundred on some injectors and a mail order to get you started.

After my HC install I was on a mailorder tune from one of the "big two", and it got me running but was rich in the lower rpms and then leaned out pretty bad up top. Gas mileage was horrible too. Without a tune I'm sure it would have been quite worst, maybe even damaging something.

 

since when are 24# good for near 500hp? i know my 22# are at 85-90% duty cycle with a mere 277whp at wot

 

You can run 24# injectors up to 450 horsepower. Its been done.

 

It will run, BUT you weren't cheep on the LE2 stuff, don't be on the injectors and tune. 30# injectors are relatively inexpensive in relation to the lack of headache of knowing you are set. The tune will then make you very happy with the drive ability. FWIW, you'll love the setup once it's tuned!!

Travis

 

i find that odd seeing as i have a friend that has a heads/cam LS1 making 441rwhp that used to have 26# at 95% duty cycle... he has since upgraded...

 

I'll probably just stick with the 36# because I plan on using a little nitrous later on, not much, but I think it will help. I would really like to tow it to a dyno for the tune rather than a mailorder, but I don't think there is one near me. If I find one, I'll be there. I just don't want to damage anything in the meantime.

 

The mailorder will be fine for a while. See sig for a mailorder tune LE car.

 

You can run 1# injectors up to 450 horsepower with enough PSI
You can run 24# injectors near 100% duty cycle if you want.

Is it a dumb risk? Yes. I wouldn't recommend it. Thats like saying you can run your car on the street at 15PSI on regular tires, You can drive on the left hand side of the road, you can buy a mustang, etc etc ... It's been done. Should You? No!

The question was "-Should- I get a tune and swap injectors before the initial startup?" not "Do I Need..."

-You will need to get bigger injectors and tune anyways
-You don't "need" to do it on itial startup, but if you have to get them anyways it makes no sense not to do the injectors and tune too.

 

You do NOT want to use stock injectors or a stock tune. Do yourself a favor and pick up some 30lb SVOs and get a mail order. I got my 30s for $150 used, they're not very expensive.

 

There have been people that have claimed to put down 450 with stock injectors. I understand that this person was probably at 100% DC, and that's really not what anybody wants to do because it doesn't deliver fuel accurately.

My point is, he probably won't put down enough power to worry about running his car w/out the bigger injectors. The stock injectors and tune will start and run fine. He's going to get the injectors and tune, but he asked if it was OK to run the stock PCM and injectors for his first startup, and it is.