How accurate are these online calculators? By their math, it looks like I'll be out of injector after my next round of mods. I currently have the 31 lb/hr 8.1L truck injectors. I conservatively expect to make 375-380 rwhp after the next round of mods. I am looking at the newer GM truck 50 lb/hr flex fuel injectors for an upgrade - part # 12613412. This truck is mainly just a daily driver/work truck, so not looking to spend $1000 on a set of injectors.

 

They are normally pretty close. What air fuel ratio you run can swing the end number a little though.

Going to the 50's or 52's from the 6.0/6.2 trucks is a great upgrade and they are cheap. All the data is available too, just need to use the LS1 to LS3 spreadsheet to convert the injector data over.

 

Depends. A lot of them can run a conservative 80% duty cycle assumptions and the BSFC can somewhat depend on where you end up for peak lambda. Since the injectors are easy to change out, you can always do a couple runs (each time getting closer to peak rpm) with the current set and keep a close eye on your duty cycle. If it hits 95%, it's time for new injectors.

 

i believe there is 2 or 3 sets in the for sale section for around $100

 

After I posted, I realized that I have a set of 36 lb/hr non flex fuel injectors out in the garage. Not a HUGE upgrade, but hopefully enough room for what I am doing. Plus they are free.

 

free is nice, but why not use the search feature and pick up one of these 50# sets?

 

because he doesn't need them and therefore can spend the money somewhere else (or put it in the kid's college fund). If he's NA, 36# can easily support 400rwhp. I could understand if he's spending upgrading anyway, why not go a little bigger and give room for more possible future upgrades; buy why spend money you don't need to?

 

The kids need to pay for their own college lol.

I payed for mine.

 

It was cheaper when we went.

 

"hey dad I'm about to walk across the stage to receive my degree"

"proud of you son following in ole dads footsteps I see"

"no daddy I graduated with a degree in gender studies"