I would expect this to be a more prominent issue on an inline 6 like an RB or a JZ engine due to the length of the fuel rail. The regulators job is in fact to act as a pulsation damper, if that makes sense. I’ve no idea what the case is in this application, but ordinarily you would not require the pulsation damper when using an Aeromotive fuel pressure regulator in conjunction with good, high flow fuel rails and corresponding port fittings, fuel lines and hose-ends. When a “pulsation damper” is used in a fuel system it is basically a bandage, that is it’s a sign that there are either compromises in plumbing or the existing regulator that are either causing excess pulses or are unable to handle the standard pulsation found in most EFI systems. I emailed Aeromotive for fuel system design help and this was their response to me. But if you come across, it should be discussed. Which is why some vehicles that has aftermarket fuel lines from gas tank to engine will be just fine when tuning and not experience this lean issue. I've done research and found that changing fuel lines from oem hardlines to aftermarket steel braided or nylon braided lines will act as a dampener internally as the inside can flex and dampen better than hardlines. Radium has really cool fuel dampener adapter for aftermarket fuel systems. I think personally my opinion, having a lean spot like that at a much higher rpm range where the engine is capable of producing a good amount of torque, personally I wouldn't like that at all. Can't imagine how lame it would feel to hit that lean spot every time you are in traffic or at a parking lot or leaving from a red light. I made one customer install the fuel dampener to his set up as he told me he was going to be street driving the vehicle. I've tuned a only track car with that slight issue and informed the owner and he was fine leaving it like that as the engine won't see those revs for long at track. I had this exact problem with two JZ motors. I don't think it's the fuel pump, because this is a centrifugal pump i don't think that it will cause pressure spikes. I think that there were pressure spikes in the fuelrail caused by the injectors. Because i only have experience with my own car, i'm curious what you guys think? In my opinion, after my problems, you need it. I want to know what you guys think about using a fuel damper. He said that, he never installs the fueldamper because you don't need it. Still a liitle bit lean, but after adjusting the fuelmap, the problem was gone.Īfter this i asked my tuner how the hell did he mapped my car like this. And what do you think? The hissing/sissing sound of the FPR is gone and the engine runs very smooth 3200 rpm. ![]() When i was looking the drawing of the fuelrail/injectors i saw that there was a fuel damper in the fuel return line. i thought that there could be some sort of pressure/flow spikes in the fuel/rail. I searched in the engine manual to see if there were some other checks i could do. But it still bothered me.īecause i could't find the problem. So i didn't spend much attention to this sound. When i was my tuner to map the engine i already heard the hissing/sissing sound and i asked him if the sound was normal. I don't know if the noise appeared while driving because of the engine noise. The only thing that was strange, was that the FPR was making a hissing/sissing sound idle. I measured the fuel pressure and it was 43,5 PSI, taking the vacuum pressure in acount.Ĭhecking the new injectors for dirt and defects, nothing found. I searched for vacuumleaks and performed a smoke test. I purchased the NIstune software and a Innovate MTX-L Plus wideband sensor. After this the engine was still running very bad 3200 rpm.Īfter that i never went back, and start to search for myself and followed the HP Academy training course. My tuner advised to put back the Original 63mm throttlebody and replace the fuel pump. ![]() The engine runs perfectly, but +/- 3200 rpm the engine was running very lean. Fuelab FPR 43,5 PSI (3 Bar)īecause of the modifications i went to my tuner, to map the engine. I had installed a greddy style intake with a 80mm throttle body. I have a Nissan Skyline R33 GTST running a Z32 Nistune ECU. So i was forced to search for myself to avoid a large bill. After a very long search i found the problem, my tuner didn't had the proper solution. I had i very strange problem with my car.
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