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Old 11-10-2017, 00:31   #31
sparkso
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Thanks for the info fred

Pumps still hardwired, next move is to return it standard wiring to see what it does incase there's something amiss in the wiring, but initial multimeter tests show voltage at 13.6 when running

Low vacuum reading could be down to the hks 272 cams in it but it's still baffling me why the pressure is dropping so much when revving.

Boost gauge moves up to - 0.1 but fuel pressure readings at the rail and pressure regulator are dropping around 0.5 instead of increasing 0.5

My next move is going to be a measure the vaccum being created at the hose I have going to the fpr to make sure it's drawing - 0.5 like the boost gauge is showing

Thanks again for all the help and info you have far Fred, it's much appreciated
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Old 11-10-2017, 07:29   #32
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Quote:
Originally Posted by sparkso View Post
Thanks for the info fred

Pumps still hardwired, next move is to return it standard wiring to see what it does incase there's something amiss in the wiring, but initial multimeter tests show voltage at 13.6 when running

Low vacuum reading could be down to the hks 272 cams in it but it's still baffling me why the pressure is dropping so much when revving.

Boost gauge moves up to - 0.1 but fuel pressure readings at the rail and pressure regulator are dropping around 0.5 instead of increasing 0.5

My next move is going to be a measure the vaccum being created at the hose I have going to the fpr to make sure it's drawing - 0.5 like the boost gauge is showing

Thanks again for all the help and info you have far Fred, it's much appreciated


Your boost controller I guess it's a apexi avcr
Did you setup the controller or did somebody else do it?

Reason I ask is we both have a apexi controlling boost and have done similar steps to fault find the same issue with no joy, I wonder if it's not setup correctly either plumbed in correctly to vac lines or the relative 1&2 and other settings it uses to control the boost pressure are actually causing the issue

Ps thanks for keeping this thread dated. And the same to you Fred


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Old 11-10-2017, 23:02   #33
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Solved!!!!!!!!!!!

Well, another evening of fuel pressure woes has ended with success

So first off I replaced the return line from the pressure reg from 8mm to 6mm that fits better to the standard return hard line

Refitted the sytec pressure reg so I can read fpr pressure and direct rail pressure from the aem rail.

Still dropping pressure....

So I took the airline and fed 1bar into the nipple to simulate boost pressure, and the gauge moved up from 3bar to 4bar. Great the pressure reg is working it would seem

Reconnected the vac line and guess what, the pressure dropped slightly!!!

Eh

Bit of a rev and we are rising pressure!!!

Fantastic, so decided to fit the 450 pump back in because the 255 was going to be running hard to keep up with the s205b

450lph pump fitted with the 3.5mm drilled return tube

And we now have rock steady 3bar base pressure and it's rising with revs

So the blast of pressure into the pressure reg must have woken it up because everything seems to be working 100% now

Thanks for all the help and advice guys, it's been a great help
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Old 12-10-2017, 17:29   #34
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Sytec aint a great make and could fail anytime bight the bullet and get a better FPR
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Old 12-10-2017, 19:05   #35
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I ran the turbo smart one. Very good. No problem at all.
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Old 12-10-2017, 19:14   #36
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Strange thing is that I've exactly the same sytec on my skyline and even it was reading the same as the new reg I got for the evo and both were using different gauges.

Has been working flawlessly for around 4 years on the Skyline but as soon as I put it on the evo it was reading up the left :s

Going to do a road test this evening and make sure that everythings working as it should so will update again after I see how the road test goes
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Old 15-10-2017, 18:10   #37
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when I ran 255 pumps I found they can pump different pressures and ltrs per min so caused issues also leaking on connections in tank rubber seal
fuel reg a decent one had to be set at pressure with vac pipe off and fuel pump hard wired via a relay
mine ran 532 /470 safe map
I ran an aeromotive 340 in mine no issues
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