Hi all,

After waiting for over a week to be contacted by the manufacturer, I am a little impatient and thought I would ask the question here.

I have a new magnaflow rising rate(1:1) regulator.

The regulator is connected to a magnaflow pump.

When the engine is off, the regulator has been set to 8psi.

When the engine idles, it drops to 5 PSI.

With 2000-2500 RPM, it drops to between 1-2 PSI.

Using the datalogger, there is a relationship between manifold vacumm and the Fuel pressure. The regulator is dropping 1PSI in fuel pressure, as the manifold vaccumm increases. (ie. pressure increases from - 3PSI to -7PSI.

This occurs on crusing, and idling before the turbo gets in to boost.

When the boost rises, the fuel pressure increases again.

Pinching the vaccuum signal line, causes the regulator to go back to the engine off pressure.

This never occured on my previous malpassi rising rate regulator.

My question is, is this a standard behaviour? Do I need to find some type of valve for the signal line, so only pressure increases in the manifold get through?

Has anyone had similar issues?

Regards,

James C.