Forums/Z31P/z31-performance-upgrade-forums engine-management/Injectors maxed out?

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onefast87: (2013-08-22 11:15:08)

Im running 500cc injectors with a walbro 255, stock fuel pressure, with a hy35 and the injectors seem to max out at 17-18 psi.MS2 is the ecu.

I could run 11 psi on the stock injectors before the duty cycle went over 90%.

Does this seem right?

I was hoping to max out my map sensor at 21 psi before the injectors quit.

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Kimbro Slice: (2013-08-22 15:22:59)

Do you have a fuel pressure gauge on the rail? Usually aftermarket fuel pumps bump up the pressure in the rail, even if you're running larger injectors. Not that the fuel pressure could max the injectors that hard or anything, but just a thought.

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FlawleZ: (2013-08-22 18:19:59)

Just shooting in the dark without knowing fuel pressure.

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onefast87: (2013-08-23 01:11:12)

Last time i tested it had good fuel pressure.

I was thinking about installing my aeromotive fpr this weekend!

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Chrisw_2003: (2013-08-23 02:17:08)

and a fuel pressure gauge while you're at it!

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onefast87: (2013-08-24 00:59:38)

I also have the gauge for the aeromotive fpr!