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#106
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It raises the fuel pressure. The fuel pressure regulator is nothing more than a restriction in the fuel's return path to the tank. The manifold pressure acts on it to change the size of the restriction but it's no more complicated than that. When you put a larger amount of liquid through the same size hole you get higher pressure. When you put in a higher flow fuel pump you get higher fuel pressure. |
#107
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excerpt from 1st section (installation overview) of first page of stage2v4 instructions: "With switch in off position or no switch connected vehicle will run on code optimized for premium unleaded and no forced induction. If you do not wish to use the second version of software housed in the memory adaptor it is not necessary to install a switch or any additional wiring." |
#108
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The flame on your welding torch doesn't change as the bottle pressure gets less. Harvey.
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One Arm Bloke. Tell it like it is! 95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels. 97 Liberty GX Auto sedan. 320,000Kls. 04 Liberty 30R Auto Premium. 92.000kls. |
#109
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That's the way I was taught that pressure regulators worked... -Bill
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Retired NASA Rocket Scientist Most famous NASA "Child" - OSIRIS-REx delivered samples from asteroid BENNU to Earth in Sept. 2023 Center Network Member #989 '92 Fully caged, 5 speed, waiting for its fully built EG33 '92 "Test Mule", 4:44 Auto, JDM 4:44 Rear Diff with Mech LSD, Tuned headers, Full one-off suspension '92(?) Laguna, 6 spd and other stuff (still at OT's place) My Locker |
#110
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Mychailo :: 2006 Silver Mitsubishi Evolution 9, E85, 34 psi peak, 425wtq/505whp DJ :: 1995 Laguna Blue SVX L AWD 5MT (sold) Visit my locker SVX Mods: ND iridium spark plugs, Impreza RS fpr, afr tuned to 13.2:1 using a custom MAF bypass, custom exhaust, WRX 5MT w/ STi RA 1st-4th gear & stock WRX 5th gear, Exedy 13 lb flywheel & Sport Clutch, STi Group N tranny & engine mounts, urethane spacers in rear subframe, rear diff mounts, and pitch stopper, SVX Sport Strut Springs (185f/150r), custom 19 mm rear swaybar, urethane swaybar mounts, Rota Torque 17x8", 225/45-17 Proxes 4 tires, Axxis Deluxe Plus organic brake pads. |
#111
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well, according to the fuel pressure guage on the fuel line the pressure went up. I believe i even put pictures of it up at the time.
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#112
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I don't recall seeing any picture...but then my memory isn't what it used to be How much did the pressure "go up"? As Mychalio mentioned, you're probably just over driving the stock fpr which means you're applying load to the internal spring that, while probably covered in the spring's design margin, is taking the fpr out of its most efficient operational "band". In a "bigger picture" sense, what are people more likely to replace, the fpr or the fuel pump? Personally, I'll take the fpr over dealing with electrical wires going into a container of liquid TNT every day of the week -Bill
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Retired NASA Rocket Scientist Most famous NASA "Child" - OSIRIS-REx delivered samples from asteroid BENNU to Earth in Sept. 2023 Center Network Member #989 '92 Fully caged, 5 speed, waiting for its fully built EG33 '92 "Test Mule", 4:44 Auto, JDM 4:44 Rear Diff with Mech LSD, Tuned headers, Full one-off suspension '92(?) Laguna, 6 spd and other stuff (still at OT's place) My Locker |
#113
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That's how I imagine it works. I could be wrong. However it works the effect is the same. I measured it. In any case I'm not advocating the use of any given fuel pump or fuel pressure regulator. I designed the stage2 v 4 software to work with all the available fuel supply scenarios. Since the v4 revision solves the fuel injector cap problem no matter which fuel supply scenario you have I'm personally done with fuel supply discussions. This thread is dead I think. Stage 2v3 no longer exists. The stage 2v4 write up is at http://www.subaru-svx.net/forum/showthread.php?t=28023 Please try to keep it relevant to stage2v4 though. |
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