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#46
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Quote:
-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 |
#47
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Bill, I'm not sure if you understood his suggestion. He wants the added hose to terminate in the circle in his picture...not start.
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David B. SVXipedia @ SVX-IW.COM -- SVX Information Warehouse 2.0 coming...eventually! Ebony 1992 SVX LS-L 5 spd Koni/GC Stebro 187k miles RIP (Rust In Pieces) 1993 SVX 5 spd Koni/GC Stebro Polyurethane bushings still available! |
#48
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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. |
#49
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my thoughs exactly on entry. if i had a extra i would send one i can look around though. the goal is to bypass it but is throwing the extra in the bigger area (by the throttle body) more effective or into a elbow (right after the maf) which is packed with air already? or would that even matter?
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#50
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It would be an interesting comparison. From what SGS has said, I'm guessing that my current configuration may be the more effective one for a couple of reasons. First, I think that SGS is suggesting that the corrugations in the main pipe will further inhibit flow in the main pipe at high air velocities. This would increase the percentage of air going through the bypass tube at high rpm. Second, it may be difficult to smoothly merge the airflow from the bypass back into the main pipe right after the MAF. Third, I'm also wondering if having the bypass tube end near the throttle bodies causes a strong pull on the air going through the bypass. All just guesses though. To know for sure, I can test it, or maybe SGS can model the main pipe and the bypass together. :-))
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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. |
#51
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David, You're right....I read the post too quickly...good catch! -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 |
#52
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On another note... how does the bypass effect the IRIS system? Isn't the IRIS designed w/ a specific length/volume intake for resonance purposes?
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3 turbos, 28 cylinders, 96 valves, 18 cams, 1400hp/1600ftlbs: '09 Outback XT / '06 Outback Sedan / '02 WRX / '94 SVX / '01 F-250 SuperDuty |
#53
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im not real technical, but basically what im gathering from this is that if you have a "ram air", this would help?
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Would love an SVX of my own... |
#54
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The MAF bypass is designed to prevent the MAF (Mass Air Flow meter, it measures the amount of air entering the motor) from "maxing out". Basically, if the car is running at high load/rpms, there is the possibility that MAF won't be able to accurately measure all the air coming into the car, which can cause a problem for the ECU as it attempts to calculate the amount of fuel needed for combustion. So, if you let some ari flow around the MAF, you can provide the motor with plenty of air w/o the MAF maxing out. However, this is very dangerous because if there is air entering the motor that the ECU doesn't know about, the motor will run lean and blow itself up! To counter this, a higher pressure fuel pressure regulator (FPR) from an Impreza is used to bump the amount of fuel that's dumped in the motor. Getting a balance between the extra fuel and extra air is a delicate procedure, which mbtoloczko is attempting to measure with his wide-band 02 sensor, as he tries different bypass configurations in an attempt to find the ideal setup to match his FPR. The ultimate goal is to give the motor more air and the matching amount of fuel so that all the air is burned during the combustion cycle, because air = power. Which is why people try things like ram air, turbos, superchargers, NOS, etc... they're all ways to get more oxygen into the motor.
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3 turbos, 28 cylinders, 96 valves, 18 cams, 1400hp/1600ftlbs: '09 Outback XT / '06 Outback Sedan / '02 WRX / '94 SVX / '01 F-250 SuperDuty |
#55
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Why not put a voltage resister inline between the maf sensor and ECU that will not allow voltage to be read up to the voltage cap (4.5 volts it is right?)? Just thinking out loud since I can see the power die off on the dyno run I did, when the maf supposedly maxed out. Yeah, this is old news but I couldn't find out who have done this while searching. I will continue.
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Kevin Thomas 1997 2.2ltr Subaru Impreza Outback Sport Wagon (AWD/Auto) 13.03@100mph 1989 2.7ltr Subaru XT6 (AWD/Auto) 15.912@85.93mph 1996 3.3ltr SVX (AWD/Auto) 15.070@91.38mph ***R.I.P*** 2010 RAV4 AWD Sport (13.717 @ 99.19mph ) 2015 Honda Fit LX CVT (15.2 @ 90mph) |
#56
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This thread is actually worth resurrecting
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R.I.P Cool Signature. You're gone but not forgotten. I mean, sure, I kindof don't remember some of the finer details..but I remember you were funny, and at one point you said spaghetti in Dutch....but definantly not forgotten |
#57
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There is another way to handle the situation. For some other cars, people will cut the MAF sensor out of the stock body and install it in a larger diameter body. The problem here is that air flow vs MAF voltage is highly dependent on the geometry of the MAF tube. Small perturbations in geometry can affect that correlation and the afr.
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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. |
#58
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Now to start trouble! I was thinking that perhaps the ECUtune software/Z32 maf combination would address the issue I saw that happens with power output above 5500rpm. Looking at the dyno chart on their site, it doesn't. (Here's where you guys shoot me at). This leads me to believe that the problem above 5500rpm is not because the volts max out but because the engine is not getting enough air going through it. Something 'is' restricting it somehow. Turbulence, air flow discrepancies.....I dunno. Something!!! (U already know I think it is the intake). I will post up an example of this on a before and after dyno chart of another Subaru I have after I get chewed up a few posts.
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Kevin Thomas 1997 2.2ltr Subaru Impreza Outback Sport Wagon (AWD/Auto) 13.03@100mph 1989 2.7ltr Subaru XT6 (AWD/Auto) 15.912@85.93mph 1996 3.3ltr SVX (AWD/Auto) 15.070@91.38mph ***R.I.P*** 2010 RAV4 AWD Sport (13.717 @ 99.19mph ) 2015 Honda Fit LX CVT (15.2 @ 90mph) |
#59
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After reading all this so far I am wanting there to be a page 5. Too bad I can't contribute anything to this thread.
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"They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." Benjamin Franklin blk 92' LSL w/ average mods pics here http://s306.photobucket.com/albums/nn277/yourconfused/ Cash68: "Hmm, I wouldn't brag about beating Escorts. That's like saying you tricked a retarded person." |
#60
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can this mod increase my hp/torque or just prevent me from looseing any at high speeds?
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