RE: Backpressure: The Myth and Why It's Wrong.

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Honda Civic >> Your Ride >> Header, Intake, & Exhaust >> RE: Backpressure: The Myth and Why It's Wrong.

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RE: Backpressure: The Myth and Why It's Wrong. - 7/4/2006 7:55:43 PM    Impreza WRX Posts: 335 Joined: 1/6/2006 Status: offline If your exhaust is 3" wide, that is your problem. General consensus is 2.25-2.5" max. Also, 4-1 header makes less low end than 4-2-1 header. (in reply to WhiteCivic15) Post #: 51

RE: Backpressure: The Myth and Why It's Wrong. - 7/4/2006 7:57:04 PM    Impreza WRX Posts: 335 Joined: 1/6/2006 Status: offline Now I've got the D15B7 engine, and there is no power until you hit 5,000 RPM. Only upgrade is a short ram intake, which did not affect low end power. (in reply to Impreza WRX) Post #: 52

RE: Backpressure: The Myth and Why It's Wrong. - 7/4/2006 8:46:00 PM    WhiteCivic15   Posts: 15 Joined: 6/28/2006 From: Albany, NY Status: offline what do you mean by '4-1' and '4-2-1' header? (in reply to Impreza WRX) Post #: 53

RE: Backpressure: The Myth and Why It's Wrong. - 8/23/2006 12:38:03 AM    jbsi99 Posts: 8 Joined: 8/21/2006 Status: offline So I would like a suggestion on a pipe size for my civic, when my ve-tech is cracking around 6000rpms.... I was thinking about getting a 3inch DC Sport cat-back exhaust. (in reply to sacicons) Post #: 54

RE: Backpressure: The Myth and Why It's Wrong. - 8/23/2006 11:21:19 AM    Remmy Posts: 11161 Joined: 1/11/2005 From: Charleston Status: offline First off its vtec. I have never seen somebody go so out of the way to spell it like you did . Second, a 3 inch exhaust is only good for a DOHC VTEC turbo beast. 2.25 will be the best. Anything more or less will cause you to actually lose power. _____________________________ (in reply to jbsi99) Post #: 55

RE: Backpressure: The Myth and Why It's Wrong. - 9/20/2006 11:04:57 PM    riceburner700 Posts: 6507 Joined: 1/21/2005 From: Loveland CO Status: offline or you got a single slammer running 30pounds of boost with over sized valves...^^^ _____________________________ non-vtec ALL THE WAY cylinder head guru! (in reply to Remmy) Post #: 56

RE: Backpressure: The Myth and Why It's Wrong. - 10/12/2006 2:08:59 AM    Benevolance   Posts: 2 Joined: 10/12/2006 Status: offline Well Technically speaking the Ozone Layer has slowly started to replenish itself...CFC's were the main cause of Ozone being depleted. The latest studies show that Ozone Replenishment is slower than thought and tied to cyclical temputures at the poles and wind direction...Also the CFC's hang around in the atmosphere much longer than originally thought. So clean emissions out of the exhaust pipe will not save the Ozone...But they might help slow global warming(there is no stopping it short of covering the planet with a solar shield straight out of some sci-fi novel)...Smog might go away and the world might breathe a little easier.... So tailpipe responsibility should fall to all of us. At the same time we need to put more pressure on our governments to reduce emissions from power plants and to stop the world from using fuels like coal where there are not seriously advanced smoke stacks with scrubbers and carbon filters& convertors...etc Automobiles are getting amazingly clean...The fuel we burn is getting very clean...The amount of Carbon released and nasty emissions is dropping fast worldwide from Automobiles. Power Generation is going to be our biggest problem when speaking of air quality in the future...The world is awfully power hungry and windfarms and solar panels are not capable of handling this power demand surge....So it likely means more oil, coal and natural gas will be burned to generate electricity (in reply to Roto) Post #: 57

RE: Backpressure: The Myth and Why It's Wrong. - 11/12/2006 11:07:02 PM    Impreza WRX Posts: 335 Joined: 1/6/2006 Status: offline quote: ORIGINAL: WhiteCivic15 what do you mean by '4-1' and '4-2-1' header? 4-1 means all 4 exhaust ports go immediately into 1 pipe 4-2-1 means 4 ports merge to 2 pipes then merge to 1 pipe 4-1 is like this \\||||// ...| | but 4-2-1 is like this \\ || || // ...\ \/ / .....| | < Message edited by Impreza WRX -- 11/12/2006 11:09:12 PM > (in reply to WhiteCivic15) Post #: 58

RE: Backpressure: The Myth and Why It's Wrong. - 1/28/2007 7:52:16 PM    point break 92 Posts: 459 Joined: 1/9/2007 Status: offline amen, amen.....so your saying to stay with the factory exhaust? or just give it straight 1? you lost me there bro? (in reply to sacicons) Post #: 59

RE: Backpressure: The Myth and Why It's Wrong. - 2/2/2007 6:43:44 PM    Eun Posts: 795 Joined: 12/15/2006 From: Santa Rosa Status: offline I just learned about back pressures in my auto tech today. Not a good thing. This thread helped me get more knowledge on the backpressure...thanks. (in reply to sacicons) Post #: 60

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