bgd73 Posted May 30, 2006 Share Posted May 30, 2006 I haven't ever out done an exhaust system until a Subaru and some of its oem dimensions. How does an expert REALLY tune an exhaust for a an old Sube? Not too big, not too small... just right.:-\ Link to comment Share on other sites More sharing options...
joostvdw Posted May 30, 2006 Share Posted May 30, 2006 I'm no expert, but on a EA82T, 2,5' is a nice diameter, if you go bigger, topend may increase slightly, but low-end will suffer dramatically, not something you want on a streetmachine and I've heard that for the manifold, the 2 pipes should have the same amount of cc as the cilinders behind it, so for the EA82T, the pipes should be 900cc not sure about this, but it is something to look into.. Link to comment Share on other sites More sharing options...
bgd73 Posted May 30, 2006 Author Share Posted May 30, 2006 ok. thanks. so how do you put that number into a circumference/ diameter of a pipe? OEM should be correct, then. Why adding more air on a sube engine is so hard on the oem stuff could only be the balance defying the cc logic.Low end does indeed stay good, towards higher rpms, like 4000 it seems as though bigger is a must have.maybe A variable exhaust pipe valve....:-\ The dynamics from low end to top end is huge! it likes both! Link to comment Share on other sites More sharing options...
cubastreet Posted May 30, 2006 Share Posted May 30, 2006 The new aston martin does that. At low revs it runs a regular exhaust then at something like 4k a big valve opens up to turn it into a straight-thru pipe! Link to comment Share on other sites More sharing options...
bgd73 Posted May 30, 2006 Author Share Posted May 30, 2006 Being new subaru has it on the intake side already.... I have never driven an engine so full a curve, start to screaming, what would it take to encapsulate everything to an exact science? I am better off for now keeping the oem tail end, my old ea82 is just that. Link to comment Share on other sites More sharing options...
Buick350X Posted May 31, 2006 Share Posted May 31, 2006 I dunno if this will help ya but there is allot of good info in this article that can surly help ya understand the basics. "You can build a quiet exhaust system that performs almost like open headers." By Jim Hand & Tom Hand [This article first appeared in Pontiac Enthusiast Magazine. Permission to publish it on the Internet was granted by the magazine and the authors to fellow Pontiac enthusiast and fellow webmaster, Eric Douthitt (The Pontiac Garage). It now appears here exclusively through the courtesy of Eric, Jim and Tom Hand. ] http://www.pontiacstreetperformance.com/psp/exhaust.html Link to comment Share on other sites More sharing options...
SOOBOUTLAW Posted May 31, 2006 Share Posted May 31, 2006 The exhaust ( cat back) on my Brat is 2"..., a little bigger than the 1.75" at the cat back... muffler shop job, it works, but ain't anything real performance due to difference in diameter. Need full size from collector back or things run kinda funky. (low end kicks in fast, yet top end bogs big time.) Link to comment Share on other sites More sharing options...
joostvdw Posted May 31, 2006 Share Posted May 31, 2006 the first major draw on the stock system is the back muffler, replace it with a open type and you'll get a nicer sound and a bit more "oumpf" because that stock bastard is way to restrictive if you've done that and want more, replace from the cat back with 2 1/4 inch, with, if you still want more, you need custom headers and a hi flow cat, mucho $ but you'll notice the difference (especially the cat, they're less restrictive than normal "coated brick" cats ) Link to comment Share on other sites More sharing options...
bgd73 Posted May 31, 2006 Author Share Posted May 31, 2006 The stock muffler is hollow in the coolest part of the whole system. The "oomph" on a bigger one is your hollow imagination . pun intended. Deeper compression, bigger valves, high rev cam. Even then that freaky hollow 50 year muffler would hang onto every "oomph" you think your having. A v8 I ran with high hp didnt even need 2.25 inches on higher compression and bigger valves and revs to 8000. with a cylinder firing every 90 degrees. Stop the four cylinder window rattling fantasy and get a real exhaust. It is much quieter than you "kids" think.Seeing those large pipes for a four banger has people like me muttering. Four cylinders need precision on the exhaust, not a flame throwing "short timer" crowd exciter. Link to comment Share on other sites More sharing options...
joostvdw Posted May 31, 2006 Share Posted May 31, 2006 suit yourself, I know the back mufflers are restrictive, and the increase is not only in my mind. OEM pipes are restrictive so a better flowing slightly bigger pipe is worth a try, especially when your old pipe is rusted away like mine... I am talking about a EA82T eh? Link to comment Share on other sites More sharing options...
bgd73 Posted May 31, 2006 Author Share Posted May 31, 2006 I suppose either way has its way. longevity or not longevity. 1000 miles straight with the big pipes proved it to me a long time ago... there needs to be a tuned exhaust exactly for the engine, from low rpm to high. A twin turbo v8 could get thru 2.5 inch monster pipes easily. It is a hoax on a modern four banger. Ridiculous. Hoax. Link to comment Share on other sites More sharing options...
Anthenium Posted May 31, 2006 Share Posted May 31, 2006 Being a former Honda tuner, and a Fan of the Sleeper, I have made a few Hot Hatches in my day. The Biggest Bang for the Buck comes from an after market Intake, a Header, and a Cat Back exhaust. These little engines need to Breath! Just adding a muffler isn't going to do much. And adding a LOUD muffler is quite annoying! But since there isn't much in the way of Intakes & Headers for the EA8X Soobies, a less restrictive exhaust is about all there is to try... The stock muffler is hollow in the coolest part of the whole system. The "oomph" on a bigger one is your hollow imagination . pun intended. Link to comment Share on other sites More sharing options...
bgd73 Posted May 31, 2006 Author Share Posted May 31, 2006 The Biggest Bang for the Buck comes from an after market Intake, a Header, and a Cat Back exhaust. These little engines need to Breath! Just adding a muffler isn't going to do much. And adding a LOUD muffler is quite annoying! But since there isn't much in the way of Intakes & Headers for the EA8X Soobies, a less restrictive exhaust is about all there is to try... A weak intake will make the big exhaust hollow. Something finally filling it would surely be something breaking on the engine. There is a way to work with some oem stuff to open up the top end, hence this post. There is no exhaust correct it seems for what simple things I have done.Cat back exhausts are great indeed, without the noise, especially if designed for specific cars. good stuff. Two inch the whole way may not be a killer, I have seen some here with it sounding good. Link to comment Share on other sites More sharing options...
SOOBOUTLAW Posted June 1, 2006 Share Posted June 1, 2006 I have what looks like the original exhaust (armored and Subaru stamp in it) with a 2" glasspack out back, rumbles hella loud, noticable improvement of power and gas mileage(not much mileage cuz I drive hard). Link to comment Share on other sites More sharing options...
bgd73 Posted June 1, 2006 Author Share Posted June 1, 2006 hey, I wonder if there is a 2 inch version of the sube ea82 muffler. I really like it. hollow canister, no flow is taking a restrictive "90" to get out and it gives a mellow bass in conjunction with a glasspack as sound resonator...not to mention they last and last and last. Any brands to check into? Link to comment Share on other sites More sharing options...
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