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Join Date: Nov 2017
Location: Qatar
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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.

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Old 06-29-2020, 01:50 AM
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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
Old 06-29-2020, 04:47 PM
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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.
Old 06-30-2020, 05:39 PM
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Siemens 60#/660cc will be more than enough to support 500whp at 3.0-3.5bar base fuel pressure.
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Old 07-01-2020, 10:07 AM
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Got some new 750cc siemens if in need., Jay.
Old 07-02-2020, 01:21 PM
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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

Old 07-03-2020, 08:15 AM
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