I am in the middle of a 418 stroker build, and I am looking to upgrade to a bigger injector. Has anyone had any experience using these on an LS3?

I have heard that the LS9s spray at a different angle, and I did not know if they would be compatible on the LS3.

As for the build, it will be N/A using stock heads and intake.

 

They are included in all E-Force kits, so I along with plenty of others have used them on LS3's. I never used them in the stock manifold, but I cannot see any problems whatsoever.

 

Vengeance put mine together with 60# injectors. I'm pretty sure they're Siemens.

 

Yes it will be a issue. The ZR1 injectors has a 20 degree axial offset, which on a ZR1 is fine because the injector is offset from the center line of the intake port. On your LS3 the injector tip is center line so when the injector sprays it spray against the edge of the cylinder head instead of hitting the intake valve. Does this mean it will not work, it will still work but there are two issues. First you have to deal with the wall wettting and evaporation of the fuel on the cylinder head. There are tables for that and they can be time consuming to get them right. The bigger issue that nobody likes to talk about are the IVT and IJT models that are built around a injector with a pencil stream hitting the intake valve. This one is a unknown fix and the effect is also unknown. GM spent allot of money to build that model so I would assume that it is important. None of us have the ability to do what they did on those. So with those two important items I would look for another injectors.
So what injector to use, that is a good question. We are working on injectors now to try and fill a huge void, if you have a month then I may have something then. The Deka60 is always a good choice also, it will be a little big for what you are using it on. You did not say what year car you had, so if you have an 08 and older you will have to scale your calibration for the Deka injector, it is 60lbs at 3 bar and your car operates at 4 bar and that injector is 73.4lbs at 4bar. On 08 and back the limit of the PCM is 63lb, so you will have to do some scaling to make the injector work. If you have an 09 and later than you will be good. That is a big injector for N/A motor, had the ZR1 been a straight injector it would probably be perfect. Bosch makes a Bosch III injector that is 42lbs@ 3bar that injector is 48.3lbs @ 4 bar. That is a tall injector though, but you could make it work, you would also need a wiring kit for it, but you will also need that kit for the Deka's. There is also supposed to a new Deka 54lb with would be a 62.1lb injector at 4 bar, but there is no injector data available for it right now.

 

Injector Dynamics 850s. You need Injector data. The LS9 is great, because you can grab the Data from an LS9 file, but as mentioned, its angle is different and the wall wetting parameters and well as evap factors all change.

If you have less than 550/575 rwhp, I would stay stock, as they will supply that amount of fuel no problem.

If you are planning on swapping to E85, or run higher RPM, I would just do yourself a favor and use an Injector dynamics 850 because you have the proper injector information.

 

So you are saying there would be no gain going with a larger than stock injector? 08 LS3 Kooks long tube and cats, Corsa, Halltech, 160 stat, Tune by BSP in Medina. If there are gains to be had what do you recommend?

 

no gain at all. I would bet your running less than 70% duty cycle

 

Nailed it.

There is absolutely zero reason to run a larger injector on an LS3 car unless you're north of 575+ RWHP. We build 500-550rwhp cars all the time that have no issues with the LS3 injector.

And yes, I.D. injectors are the shiznit. Expensive but worth every single penny.

 

Why the LS7 revs more than a LS9 despite a longer stroke and higher piston speed?