im wondering how safe It is too use extra injectors? I aint going to lie things are tight right now and Im running Stock dek injectors which are maximing out around 5 to 6psi. I have two 370cc injectors in the shop and a fuel rail that I can mock up to insert them in my charge pipe and control them with my EU. Im wondering how much will the stock injectors with two more 370cc injectors support and how safe would it be!

 

its all on how you secure them onto the charge pipe.
can you take any pics of where you are going to put them?

 

I think most here are going to advise against it. I'm guessing the typical response will be to keep it low boost until you can afford larger injectors.

 

their going in a 3 inch pipe right before the throttle body. They will be right in front it. one injector at 11 oclock and the other at 1 oclock

 

Nealoc has one extra injector he controlls with Emanage blue. Im not sure where he has is mounted. Wait for him to chime in.

-matt

 

aic96max uses two extra injectors on his setup, has been fine for a while,.

 

What size is his other two and how much will it support. Im also wondering how much will the two extra 370s support?

 

I believe he's against this type of fuel management, though. His setup is that way because that's how Hal has had it.
I don't know enough about this type of setup to criticize it, it was just the general idea I got from what I've read. I'm interested to see what others have to say who have experience with it.
(370 + 370) / 6 = ~123cc per cylinder on top of the DEK injector ratings Educated guess, I could be WAY, WAY wrong as to how the extra injector thing works. A stab in the dark

 

He has two 1000cc's. Its not really overkill, keep in mind that he is using the stock DEK injectors (290cc), with these on top of that.

He had 555s on the DE (259cc) but when he put up the boost to I think either 10psi or 12psi they were pretty close to being maxed out to maintain the a/f he needed. So he upted for the 1000s and they've been working great for years.

I think that if you're using 370s asthe main injectors, 555s should do the trick no problem as the extra injectors. You might be able to get away with 370s as the extras. I guess now that you have some #s as to what he has, you can guesstimate what you need. I'd try to but Im too tired, lol

 

I think he's doing all this based around the DEK injectors as being the mains and the 370's being the extras.

 

I'm not a fan of this setup though I had been running it up until last fall. Our manifolds are dry manifolds, not designed with the equal dispersion of vaporized fuel in mind like wet manifolds are. You could show a good AFR on your wideband, but you could have AFRs all over the place in each individual cylinder which just "averages out" to a decent AFR. You might be running one cylinder in the 13s and one in the 9s, and your wideband would just be telling you that your average AFR is 11 (though it likely isn't that drastic of a difference).

I won't be running this setup anymore now that I've got properly sized injectors.

Anyhow two 370s on top of 6 290s would give approximately the same fuel flow as six 410cc injectors I believe (just did the arithmetic quickly in my head since my computer calculator program is messed up apparently), assuming all were running the same FP and IDC, etc.

 

ok im using the dek manifold. Does that make any differance

 

no, that's not a wet manifold either. wet manifolds are either aftermarket and designed as such (not very common anymore) or came on old azz cars with throttle body injection.

 

Listen to the man ^

 

Well the stock 290s support 278hp at 80% duty cycle, or 313hp at 90%
The two 370s will give you an additional 118hp at 80% or 133hp at 90%

So 396-446hp depending on how hard you want to push your injectors.

As far as safety, I would not go beyond 375hp and only temporarily. As Nealoc said the mixture will not be even between cylinders.