Why upgrade fuel system? - Nissan 350Z Forum : 350Z / 370Z Tech Forums

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Old 11-07-2006, 08:06 AM   #1 (permalink)
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ok guys how far can you go before you have to upgrade your fuel system and how far do you have to go in upgrades? I know that the 350z has a non-return system. Has anyone upgraded to a full return system and why would you want to upgrade to a return system?
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Old 11-07-2006, 10:05 AM   #2 (permalink)
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People do it when they go forced induction to make sure you have a steady fuel pressure.
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Old 11-07-2006, 10:56 AM   #3 (permalink)
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In your opinion what would be a good system? I was looking at the AAM Spec Fuel Rail Return System but I don’t know if I need to go that far.
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Old 11-07-2006, 11:50 AM   #4 (permalink)
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What kind of mods are you currently, and planning, to run? I have yet to see a streetable NA or lightly boosted car require a fuel system upgrade.


The reason why you'd want to switch to a return system is if you're planning on running a lot of boost. With a non-return system, your pump has to supply just more than enough fuel so you don't lean out, or overpressurise the fuel rail. Since on a non-return system the ECU sends a signal to the fuel pump directing it to flow a certain amount (based on the air that's going into the engine), when you start upgrading your fuel system you need to make sure the signal is either modified, or your pump is set up, to keep the mixtures correct.

With a return system, you can just tell the fuel pump to go nuts and run its rate independent of engine load. Anything the injectors can't use doesn't build up in the rails, it just gets returned. A lot easier.
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Old 11-07-2006, 11:53 AM   #5 (permalink)
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The OEM setup is not really designed for boost. It is not designed to flow enough fuel, or monitor the pressure as accurately as needed. Currently there is only the AAM and 1 other fuel return system. They both cost about the same and are similar in design.
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Old 11-07-2006, 12:02 PM   #6 (permalink)
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Well, right now I have cold air intake, dc headers, test pipes and hks cat back. Im planning on getting a Vortech supercharger, upgrading to 9:1 pistons, new rods, new cams, new springs and a Crawford plenum. I thought that with all of this upgrades I would need to upgrade my fuel system as well.
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Old 11-07-2006, 12:16 PM   #7 (permalink)
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If you are going forged internals you will most likely want to upgrade the fuel system as well.
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Old 11-07-2006, 12:26 PM   #8 (permalink)
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the AAM system is the way I was thinking of going. how would this mod affect the ECU and the performance of the car if I put it before i SC or should I just do everything at the same time?
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Old 11-07-2006, 08:00 PM   #9 (permalink)
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Considering the stock bottom end is good for 400rwhp / 7psi of boost, and most of the turbo kits that pull those kinds of numbers require some kind of fuel system upgrade, if you "need" to rebuild the bottom end with a stronger and lower compression setup then the OEM fuel system definitely won't cope.
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