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rsrmike rsrmike is offline
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Join Date: Jan 2008
Location: Birmingham, AL
Posts: 538
The reason your fuel pressure should be matched to manifold pressure is to correct for pressure differentials between manifold pressure and atmospheric pressure.

The injectors are tested at 43 psi and their flow rate is calculated against atmospheric pressure.

Spray them into a vacuum (part throttle intake) and their flow rate will increase as there is less resistance out of the injector.

Spray them into a manifold with boost on it and they will not flow the same rate as they are fighting the pressure in the manifold.

The changes in fuel pressure help to equalize this for the most part although there are variables and errors to everything...

You can read more about this in Electromotive's TEC manuals on their website.

Last edited by rsrmike; 08-16-2008 at 06:13 PM..
Old 08-16-2008, 06:10 PM
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