Originally Posted by krambo

Here is a "guideline" for injectors:

1. Take your target peak horsepower (FW) and multiply by .6
2. Take your resulting number and divide it by 8 (number of cylinders)
3. Take that number and divide by .9 (corresponds to a 90% IDC)

The final result is your desired fuel injector flow.


If you wanted to calculate a NA motor instead of your supercharged motor, you multiply by .5 in step 1 and for turbo, multiply by .625.

Originally Posted by 1BADAZZSS

What if you are running E85, IE E85 takes 20% more to run then regular unleaded gas.

Originally Posted by waterdog

I installed a used radix which had a 2.8 pulley and 44 lb injectors on my 6.0 lq9. It came off of a lq9 as well. The previous truck had a stock cam and manifolds with a free flowing exhaust. The injectors were at 75%. My truck has a 212-218 low lift cam and long tube headers. This cam isn't that big for a 6.0L, it idles like stock. I also installed meth inj using washer fluid because its in my washer fluid reservoir and I dont want 100% meth spraying on my windshield. Just wondering if 44lb injectors may be big enough, I dont want to buy 60s if I dont have to and I dont have a wide band yet.