boost referenced regulator

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03-27-2011, 10:08 PM

#11

SVC707

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cool thanks for the info, i will be buying fuel pressure, boost and wideband gauges, plus i have hp tuners if i want to drive around and monitor it.

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03-28-2011, 02:08 AM

#12

Three6GMC

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Quote:

Originally Posted by Atomic

Umm, not quite. Boost referenced FPR's dont work the same way in vacuum as they do under boost. Think about what you said for a minute, if it were true there would be no point in setting regulators since it would only be right at one vac setting. That screw on top is a physical stop for the regulating mechanism, boost can push it down more, but vac cant suck it up any more because the screw stops it.

Very true...

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03-28-2011, 11:51 AM

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MikeGyver

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Quote:

Originally Posted by Atomic

Umm, not quite. Boost referenced FPR's dont work the same way in vacuum as they do under boost. ...

Yes they do, so does the stock regulator. That is why you will see a lower pressure when the engine is running than when you cycle the pump with the engine off. So with the engine idling, the pressure might be 57 psi, and when you adjust the base fuel pressure the correct way, it might be 62 psi. In my Magna Fuel regulator, the screw is not a stop, it adjusts the spring pressure. The vacuum limit comes when the spring is fully collapsed. The correct way is to turn the ignition on so that the pump primes, keep doing this until pressure maxes. That is the base pressure, unaffected by boost or vacuum.

Swerve7rpm2000 is correct, it is up to the tuner. If you use boost reference, the injector flow rate vs. kPa table will have the same values across the board, and if your regulator does not have a vacuum hose, the same table will vary according to the injector data. The VE tables will be different for each type of regulator.