Dirk Posted November 25, 2009 Share Posted November 25, 2009 (edited) Does anyone have a basic spec for an exhaust upgrade for an early EA71? I am interested in Performance, NOT sound. Infact I would prefer to have subtle sound if possible. I should be able to do the fab work myself as long as I know what muffler to use and what size pipe. I'm still running on a stock carb but hope to upgrade to a webber some time soon if that is relevant. Cheers. Dirk. Edited November 25, 2009 by Dirk Quote Link to comment Share on other sites More sharing options...
hatchsub Posted November 25, 2009 Share Posted November 25, 2009 For my EA81 i had a local shop make me a custom exhaust from the heads back out of stainless steel since i was tired of the exhaust rusting to nothing from the inside out after only a few years. I did 2 inch pipes the whole way back. It sounds mellow if not a bit louder than stock but not terrible. I wouldnt go any bigger than 2 for a N/A 1.6. 2 might even be pushing it a bit too big for that motor too. You might want to do 1 7/8 primarys and 2 inch secondaries. The big thing that was holding mine back was the factory restrictive y-pipe (might have been aftermarket too not sure). The drivers side head dumped its exhaust at a 90 degree into the passenger side exhaust. Not exactly good flow for power. Quote Link to comment Share on other sites More sharing options...
The Beast I Drive Posted November 25, 2009 Share Posted November 25, 2009 For the EA71 in my Brat, I built my dual exhaust using 1 3/4 Primaries, an X-pipe under the trans crossmember made of 1 7/8, and I ran 1 7/8 pipe back to a pair of glasspacks, then 1 7/8 back to the back of the passenger compartment, where they do a 90 degree bend and go straight out each side. Its not loud until I REALLY get on it, but it has a ton of torque, and Ive had it up t0 over 75mph (stock 4 speed 4wd, fairly low 3rd and 4th gears) You dont want anythng bigger than 1 3/4 for the primaries on a EA71, you will lose all low-end power. It accelerates better than my RX did, and it has plenty of torque for off-road and such. I also am running a Weber carb, on a early 1400 manifold. -Bill Quote Link to comment Share on other sites More sharing options...
Dirk Posted November 25, 2009 Author Share Posted November 25, 2009 Sweet! Thank you guys. Bill, is there a goog reason why I should not just coninue the pipes to the back after the glasspacks? Side exhausts sound cool but I'm not really into that kind of thing. Cheers Dirk. Quote Link to comment Share on other sites More sharing options...
The Beast I Drive Posted November 25, 2009 Share Posted November 25, 2009 Sweet! Thank you guys. Bill, is there a goog reason why I should not just coninue the pipes to the back after the glasspacks? Side exhausts sound cool but I'm not really into that kind of thing. Cheers Dirk. I just run them out the sides because thats how I like them, but you can run them to the back no problem. Also, I used 18" long glasspacks -Bill Quote Link to comment Share on other sites More sharing options...
Dirk Posted November 26, 2009 Author Share Posted November 26, 2009 (edited) Awsome! Thank you. One more question: Is it worth me doing this will I'm still using the Hitachi carb? Edited November 26, 2009 by Dirk Quote Link to comment Share on other sites More sharing options...
Dirk Posted November 27, 2009 Author Share Posted November 27, 2009 Iv'e been looking under the car and I think that it would be good to connect the primary's to the x-pipe after the transmission. There is more room there so it would give me better ground clearance. Is there any reason why I can't do this? Is the length of the primary's important? Also, do the primary's have to be the same length? Cheers, Dirk. Quote Link to comment Share on other sites More sharing options...
The Beast I Drive Posted November 28, 2009 Share Posted November 28, 2009 It should work fine if you do the X pipe behind the trans, thats how I have it in my '85 Brat. Its best to make the primaries as equal length as possible. -Bill Quote Link to comment Share on other sites More sharing options...
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