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#1
02-01-2005, 09:53 AM
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Anyone notice the Porsche 3.8L uses the IRIS system?
When I was at the Detroit Auto Show, they had a cutaway display of the Porsche 3.8L engine. An awesome 350HP and 295Ft/lb of torque from a naturally aspirated engine.
The Intake system caught my eye. It had butterfly valves that separated the intake tract into two halves and had two throttle bodies. Sound familiar? Ever since I have been looking for documentation about the Porsche system online but have come across nothing. BTW, using a carefully concealed tape measure at the show, it appears that the Porsche motor is almost the same width but is a little taller than the SVX engine. I still think it could be made to fit. Anyone want to donate one to me to test out my theory??? Doug
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1992 LS Touring (6/91) - Currently undergoing a five speed swap Black over Claret with spoiler; 235,000 miles; Mods: 2002 Legacy 5 speed, ACT Pressure Plate, Excedy Clutch, Short Throw Shifter, Aussie Powerchip 1992 LS Touring (6/91) Black over Claret with 2.5" setback spoiler; 202,000 miles; Mods: B&M Cooler 1994 LSi (4/93) Bordeaux Pearl; 198,000 miles; Mods: Weight reduction. 1969 Mustang GT Convertible 1970 Mustang Convertible 2000 Ford Excursion Sola lingua bona est lingua mortua. My Locker 
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#2
02-01-2005, 10:15 AM
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in 1987, the Porsche used a valve in the 928 intake, to alter the length of the intake runners based on RPM (differing RPM points were used, depending on if you were accelerating or decellerating). i'm not sure when the 911 started using this, though.
the Ford Probe (Mazda MX-6 engine) also used a "VRIS" system to open butterflies in the intake. probably plenty others i'm not aware of, too.
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Alan 1987 928 S4 (Black) SOLD!  1997 SVX LSi (Ebony) SOLD! 2005 Legacy GT (Silver) [Cobb Stg 2+] SOLD! 1987 928 S4 (Black) SOLD! 2005 Forester XT Premium (Crystal Gray Metallic) SOLD! 2008 Lancer Evolution X MR (Apex Silver) [Cobb Stg 1+] 2015 Outlander Sport 2.4GT AWD (Mercury Gray) 2013 G37xS (Obsidian Black)
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#3
02-01-2005, 10:26 AM
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Also used by Yamaha on their V-Max.
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www.svxfiles.com The first SuperCharged SVX,  the first 4.44 gears, the first equal length headers, the first phenolic spacers, the first Class Glass fiberglass hood, the first with 4, 4.44s in his driveway  Fiberglass Hood thread My locker 4.44 Swap link
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#4
02-01-2005, 06:48 PM
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Re: Anyone notice the Porsche 3.8L uses the IRIS system?
Quote:
 -Chike
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"Wise men talk because they have something to say; fools, because they have to say something." - Plato 2013 Cosmic Blue 5spd Evo X GSR 2006 Galaxy Gray 6MT RX-8 (sold) 2006 Steel Gray WRX TR (sold) 1996 Brilliant Red SVX L (sold)
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#5
02-02-2005, 11:30 AM
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Quote:
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Pearl '92 LS-L 179K (Historic 1st 5-speed SVX) Mods: 5-speed, 4.11's, Group-N motor mounts, dual Magnaflows, cone air filter, Kenwood MP-228 CD/Receiver, white-faced gauges, '97 grill, custom window tinting. Ebony Mica '92 LS 80K Oct 2002 - Dec 2004: Victim of theft. She served me well. You can tell the lack of craftsmanship by the wrinkles in the duct tape.
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#6
02-05-2005, 01:43 AM
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How do you conceal a measureing tape?
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"That which can be asserted without evidence can be dismissed without evidence." '92 Dark Teal SVX LS-L, >146,000m 3 pedals, 5 speeds., restoration underway. 2012 Honda Insight, slow but cute. 
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#7
02-05-2005, 06:29 AM
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Quote:
Doug
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1992 LS Touring (6/91) - Currently undergoing a five speed swap Black over Claret with spoiler; 235,000 miles; Mods: 2002 Legacy 5 speed, ACT Pressure Plate, Excedy Clutch, Short Throw Shifter, Aussie Powerchip 1992 LS Touring (6/91) Black over Claret with 2.5" setback spoiler; 202,000 miles; Mods: B&M Cooler 1994 LSi (4/93) Bordeaux Pearl; 198,000 miles; Mods: Weight reduction. 1969 Mustang GT Convertible 1970 Mustang Convertible 2000 Ford Excursion Sola lingua bona est lingua mortua. My Locker
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#8
02-05-2005, 09:49 AM
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Did you get the measurements for where it mounts to the tranny? :-))
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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.
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