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To: Dave Dahlgren <>
Subject: Re: BSFC
From: Bryan Savage <>
Date: Fri, 19 Sep 2003 18:02:42 -0700

Thank you for the information in your reply.

I am unclear about one think. When pressure is specified, does it always 
refer fuel rail pressure?
What terminology should I use to differentiate between rail pressure and 
the pressure delta
across the injector?  Is pressure always in PSIG?

Thanks for your help Dave,


The pressure problems you state are very injector specific as well as ecu
specific as to the available drive current. with a saturated injector, which
really has no business on a racing engine, or a low impedance injector with
insufficient drive current this can happen at times. Flow is controlled by
pressure across the injector not the pressure in the fuel rail. The injector
opening load only sees this as well for the most part. I have run in excess of
125 psi using bosch injectors that you can buy and are not F1 parts. Atomization
is everything when trying to make HP. It is not good to go big on injector size
and run low pressure this makes for poor atomization and you are screwed before
you even start. You do need to have a realistic projection of how much power you
are going to make before you start. It is the difference between a professional
and a backyard hacker. Then pick the injector to match the rpm and flow rates at
some pressures that will make for good atomization.

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