Will a stock 5.3 fuel pump be able to feed 8.1L injectors sufficently?
What is the stock pump rated at for a 5.3 and 8.1L, differences?
5.3 fuel rail pressure?
8.1L injector rated fuel pressure and flow rate?

thanks

 

anyone know these specs or where I can find them?

 

What Specs Are You Looking For
I Know That Just @ The Beginning Of The Week And 8.1 Was Around 50 Lbs
My 5.3 Is At 64 Lbs. I Don't See Any Problem I Am Thinking Of The Same Thing For A 408 Are Something In That Neighborhood

 

I have a set of non-marine 8.1 injectors for my 5.3 as well. Hopefully someone has these already installed and can tell us these answers so I can install mine too

 

8.1 truck 31lbs, marine 8.1 43lbs. Both the 5.3 and 8.1 injectors are rated for the same presser. The 5.3 pump will be fine unless you are using 8.1 marine injectors close to their max. Then you'll need a pump booster. I don't know what flow the pumps are rated for but I do know they're different.

 

thats good info tie
thanks

 

Anyone have the proper values to scale the injector tables in a 5.3 with the non-marine 8.1s installed?

 

found this over on hp tuners website, figure its worth a shot sounds very reasonable and easy

edgZ06:"click engine-general fuel- flow rate vs kpa. Your staock or current fuel injector size is listed.

If your stock injectors are 29 #, then at 0 vacuum the number shown is 29.15. If you are upgrading to 60 # injectors, just subtract 29 from 60 and add that number (31) to all the cells and that will do it."

Heres a calibration spreadsheet from redhardsupra one is for inj pw and the other for duty cycle

 

another method from
chris(owner of hp tuner)
the easiest way to tune for larger injectors is to know the ratio of your existing ones and the new ones. eg. if your current ones are 28lb and new ones are 36lb then mutliply your whole table by 36/28 or 1.286. Its not exact but gets most of us close enough.