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#16
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"I'll be back".....the resonator......
So i see this is a big issue as well with everybody else. So if i install a resonator on each side(Where the old cats where) Before the 2into1 pipe this noise will go away? It sounds good all up until the resonating starts, then it sounds like a cat stuck in a tin can.
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#17
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What's the engine at (rpm-wise) when "the cat gets stuck in the can"? You may just have to extend the length of the primary pipes before you join them together with a "Y"
-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 |
#18
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Quote:
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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. |
#19
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haha, i have that same problem on my car. im thinking about running duals, but i read somewhere that that creates a "two raspy 3cyl. engines running at the same time" sound and i deffinetly dont want that. any suggestions?
dustin
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-Dustin 1992 Ebony LS-L w/191k miles Mods: a few and acouple more 1995 Brilliant Red L/AWD w/154k miles Mods: Stebro catback exhaust, K&N drop in filter, ECUtune ST1v5, 4.44, lots of JDM goodies 1992 Pearly LS-L w/154k miles Sold Mods: 4.11, rust 2008 DGM Legacy spec.B w/245k miles Mods: Cryotune Stage3, VF52, bushings galore, STi pink springs, Bilstein HDs My Locker The only man alive who drives three "Subu SVS's".......according to my insurance company |
#20
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Quote:
-Bill
__________________
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 |
#21
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It may have to be a bit more than 60 inches. I'm at 58 inches right now, and the car sounds like crap from 3000-4000 rpm (and there is a slight drop in power too). I think 70 inches or so will be necessary... about the location of the factory pre-muffler.
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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. |
#22
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I just looked at my notes. If this is a constructive interference phenomenon occuring with the next cylinder firing, then the way to minimize the interference is to either place the y-pipe at about 120 inches from the manifold (past the back of the car?) or place it at around 24 inches from the manifolds.
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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. |
#23
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Quote:
-Bill (almost done reading the 4cyl aircraft exhaust system article...)
__________________
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 |
#24
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dont blame me if this is bad
i looked up some pictures of the stock exhaust, and it turns out i basically have the stock exhaust with two resonator tips at the very end instead of the stock secondary muffler. dont blame me if this is a bad thing the previous owner had this done. opinions about this?
dustin ps. i was wrong earlier, my exhaust doesnt resonate at the same rpm's as yours do, i just have a rattle somewhere at 2500-3000 after you let off the gas.
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-Dustin 1992 Ebony LS-L w/191k miles Mods: a few and acouple more 1995 Brilliant Red L/AWD w/154k miles Mods: Stebro catback exhaust, K&N drop in filter, ECUtune ST1v5, 4.44, lots of JDM goodies 1992 Pearly LS-L w/154k miles Sold Mods: 4.11, rust 2008 DGM Legacy spec.B w/245k miles Mods: Cryotune Stage3, VF52, bushings galore, STi pink springs, Bilstein HDs My Locker The only man alive who drives three "Subu SVS's".......according to my insurance company Last edited by odepaj; 01-15-2005 at 07:10 AM. |
#25
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Why a Y connection.
Connecting the two engine pipes together with a Y pipe, is not the best way for engine performance.
The two pipes should enter a box of some kind, to drop the gas pressure, before they join. If a Y pipe is fitted to the engine pipes, the high gas pressure from one, is going to enter the other pipe, to cause a high pressure in the other exhaust manifold. The way they join now is the two pipes enter the space in the front of the second cat, where the gas pressure drops. This has the pipes joining in a low pressure area, to prevent one from affecting the other. If you are dividing the system into two pipes, the dia of the pipes should stay the same as they are now. The idea that because there is only three cylinders on the pipe now, it can be smaller is wrong, as the cylinder size, is what sets the pipe size, not the number of cylinders. Only one cylinder's exhaust is using the pipe at a time. 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. |
#26
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Harvey,
I should have been more specific...the Y connection I suggested would feed into the stock (or aftermarket high flow) secondary cat, thus achieving what you've noted (given that the primary cats have been replaced by straight pieces of pipe). Just trying to keep the air a little cleaner and minimize the chance of anyone not passing their state's emissions testing. -Bill
__________________
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 |
#27
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Quote:
BTW, removing the expansion box had zero effect on the butt-dyno HP estimate.
__________________
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. |
#28
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"OEM expansion box" = OEM resonator??
-Bill
__________________
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 |
#29
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Re: dont blame me if this is bad
Quote:
The rattle could just be from your heat shields. Do you still have the stock primary cats? You might want to get the car up on a lift and see if anything is loose. -Bill
__________________
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 |
#30
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Quote:
__________________
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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