Injectors size for a low-mid boost 3.2.
 

This is part of my turbo conversion. I already have a set of Bosch LS V8 injectors that flow 32 lbs and I found in my parts bin a perfect adaptors to make them fit the stock 3.2 fuel rails, and since I'm using a microsquirt engine management, I though it would be a good idea to use these high-Z injectors instead of the stock ones, but I'm not really sure about their size for my application. I will be using an Aeromotive fuel regulator instead of the stock one, so I can run it with boost reference so it will rise the fuel flow in 1:1 rate. I did a lot of forced induction projects on all sort of american engines, but this is my first on a european car, so I need to make sure I'm doing the right thing.

Thanks...

Here is a calculator from RC Injectors. Trick is estimating the BSFC value - guessing 0.55 for forced induction aircool? Can someone verify?

https://www.rcfuelinjection.com/Technical

I started out with 600cc Siemens/deka injectors. I am running 10lbs of boost. I was running close to 70% duty cycle as far as I can remember. I upgraded to 800s. 32lb/hr injectors aren’t gonna do much for you.

Siemens 60#/660cc will be more than enough to support 500whp at 3.0-3.5bar base fuel pressure.

Got some new 750cc siemens if in need., Jay.

Kamaro,

450Hp crank need 52 lbs/hr injectors. 500Hp crank 58lbs/hr.
Calculations based on 3.5 bar fuel pressure, 0.60 BSFC and 80% duty cycle