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Exhaust question
I got this info from a website, anyone do this or care to comment?? Thanks
The first modification I recommend would be to create a complete dual exhaust from the individual cats to the rear of the car. This would eliminate the single secondary cat. The three cylinders on each bank of a flat-six engine fire evenly every 240 degrees of crankshaft travel. Since there is no overlap during this period, this eliminates the problem of one cylinder exhausting while another cylinder's exhaust valve is still open. So keep the two sides completely separate. This will result in the best flow with no reversal. Don't go too large on the pipe diameter, or you will slow the velocity of the exhaust and ruin the mid-range scavenge effect. I would recommend 2" exhaust as a maximum. Definitely do NOT use the 'most advanced new' method of using sewer pipe to conduct exhaust gas away from the vehicle. In some quest for the least amount of backpressure, these folk are missing the point that harnessing the velocity of the exhaust gases creates a scavenge affect that is better than zero backpressure. |
#2
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A true 2" dual set-up will work well with our cars but sound horrible. Basically, the sound emanating from the exhuast pipes wouldn't be a lovely flat 6, but more like two raspy 3 cyl engines running at the same time.
That's why it'll still be a good idea to use a cross-over pipe between the two sides. -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) |
#3
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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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