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#1
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exhaust diameter
Just for the record for all those who ask or have asked (and because I'm piecing together the parts for my exhaust right now): Is the exhaust diameter 2.25" or 2.5"? Is the engine really that dependant upon backpressure to make 3" too big?
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#2
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Re: exhaust diameter
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#3
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The stock piping size is 60mm (about 2.36 inches). I would be hesitant to change the size of the piping to anything larger than 2.5 inches. Something tells me that Subaru used such a strange size for a reason...
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#4
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Todd
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Down to none |
#5
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You know what I meant! |
#6
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Exhaust diameter
I am now on my sixth exhaust system experiment, the first was stock with no resonater, the second was true duals, 2", (from the joint after the cat outlet pipes) with just very free flowing Hooker Aero Chamber mufflers at the very back, way too loud below 3000rpm, but sweet like a porsche above 3000. Then, the same system with two 31" long Cherry Bombs, in the middle, very quiet, good flow, lots of power from 4500-6500rpm, next that system without the aft Hookers, again way too loud, the same results as system two. Then I hand-made headers with long primary tubes for torque, they again helped at higher revs, but cost power below 3000. Now my system has been altered/morphed into a six into one header with a 3" collecter, a 35" long Cherry Bomb, more tubing then an After Burner muffler with a crome straight pipe exiting thru the lower rear bumper. The newest system is too loud for my tastes below 2500 rpm, but at 3000 it's quiet enough to talk to my kids at normal levels.
When I drive Green-Eyed-Lady's compleatly stock SVX, hers is quicker off the line, and wonderfully quiet. If I were not planning something more under the hood, this would not only be WAY too big, but it costs power at the lower rpms. Why spend money to go slower? Last edited by svxfiles; 05-30-2004 at 06:17 PM. |
#7
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SVXtypeR dyno'd his car a while back with a K&N drop in filter and 3" cat back exhaust system (+ Level 10 Stage 3 tranny): SVXtypeR's Dyno Run
The 3" system seems to rob the engine of low-end torque which is essential in off the line acceleration (as the 4EAT has a 2500rpm stall). I've heard that 2.5" systems are much better for our cars - of course, if you're planning a big ball-bearing turbo install, then the 3" system will be better suited for that application (Evo's and STI's get gains from aftermarket 3" systems). -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) |
#8
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IggDawg is cool -IggDawg 1992 Teal SVX LS-L 160k miles 4.11:1 final drive, K&B dropsprings, ART front rotors, stainless steel brake, aluminum underdrive crank pulley, Kuhmo Ecsta Supra 712's, K&N drop-in filter. Previously owned by Alacrity024. FOR SALE 1994 SVX LSi, Barcelona Red #1659, build date 11/93, 117k miles, RIP ECUtune stage 1, bead crush, smallcar shift kit, TB bypass, SS brake lines, silencer removed, alternator and grounding wires, Mobil1 @ 117k |
#9
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Good explanation!
-Chike Quote:
__________________
"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) |
#10
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exhaust
Yea, what he said.
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#11
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it's too bad our pool of people is so small, but the consensus seems to be that 2.5" is the preferred diameter. That's what I'll be going for when I get mine.
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IggDawg is cool -IggDawg 1992 Teal SVX LS-L 160k miles 4.11:1 final drive, K&B dropsprings, ART front rotors, stainless steel brake, aluminum underdrive crank pulley, Kuhmo Ecsta Supra 712's, K&N drop-in filter. Previously owned by Alacrity024. FOR SALE 1994 SVX LSi, Barcelona Red #1659, build date 11/93, 117k miles, RIP ECUtune stage 1, bead crush, smallcar shift kit, TB bypass, SS brake lines, silencer removed, alternator and grounding wires, Mobil1 @ 117k |
#12
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Yup, from what I've heard, 2.5" is the ideal size for NA EG33 engines... If you add a turbo or S/C the exhaust diameter can be increased without having a -ve effect on backpressure.
-Chike Quote:
__________________
"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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