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Join Date: Jan 2008
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Fuel Rail pressure
Can anyone clue me in on what proper fuel rail pressure is and what it is at WOT on an early car ... im desperate for this info and dont have the adapter to check it myself
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06-16-2008, 07:23 PM
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Join Date: Feb 2008
Posts: 18,701
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i think it's like 36 psi.
also if it isn't getting any fuel. turn it over for 30 sec to allow pressure to build up in the rail then take the little nut off at the front "use rags to catch the fuel though" and if it should spay/seep out, if it's dry as a bone it's either a line blocked or your fuel pump is bad.
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06-16-2008, 07:58 PM
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Thanks for the reply, My fuel rail is working fine as far as i know and my car is running mint, Im ordering some Jets for my NOS kit and I was looking for the fuel pressure , is the 36 at wot and on an early car? if you could check that for me I would be seriously grateful
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06-16-2008, 08:30 PM
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06-16-2008, 09:18 PM
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Thanks for the link but i've read it like 50 times it does not give me the WOT fuel pressure that i'm looking for, it only gives you Idle pressure.... i guess ill just have to wait until i can get ahold of the adapter and my own gauge
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06-16-2008, 10:12 PM
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Join Date: Apr 2008
Location: Australia
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At WOT (100Kpa, or 0 vac) fuel pressure = 43.5 PSI.
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06-18-2008, 01:46 AM
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thanks RC92 I really appreciate it, Just wondering is that for the 924, the 944 8v the 944 16v or the 924s im just not sure if they will all have different readings
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06-18-2008, 07:16 AM
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Location: Nor Cal
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the 924s and 944 should have the same readings. not sure about the 16v though...
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06-18-2008, 10:10 AM
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Disregard that, was thinking 3 bar but is only 2.5 for all 8V engines.
So it is actually 36 PSI at WOT for a NA. At WOT the fuel pressure will be the same as it is at atmospheric. The engine vacuum reduces it accordingly so that the injectors operate at a constant relative pressure. The 16V, S2, engines use a 3.8 bar regulator so WOT pressure is 55PSI. Roger |
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06-18-2008, 03:10 PM
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thanks everyone, Did it today got 29 at idle and 36 at wot .... thanks for all the help
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06-18-2008, 06:18 PM
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