Hondaswap.com | Honda Technical & JDM styling Forums

caboose · 08-08-2008, 12:49 PM

I have a megan racing header and cat back exhaust on my D15B6. I heard that the larger tube header might be causing me to loose low end torque and therefore lower my gas mileage.

Do you think that this might be a problem? Does anyone make a smaller tube header at a low price?

t3t4delsol · 08-08-2008, 01:44 PM

is the header a 4-2-1 or a 4-1, the 4-2-1 are better for low end torque, the 4-1 is better for higher rpm

K2e2vin · 08-08-2008, 01:57 PM

The 4-2-1 vs. 4-1 header thing is a myth. Tube size plays a role in that(there's a bunch of dynos that show they can perform the same).

I believe your best bet would be the tubular D16Y8 header that's in the Acura EL and maybe in some other Y8s.

BTW; I got 57mpg hwy using a Z1R header(ebay 4-1 header) in a D15B VTEC cruising at 4000rpm(~70mph).

caboose · 08-08-2008, 02:50 PM

my HF is only getting 45ish on a tank... I would think that I should see a little better from it. It's a 4-2-1 megan on there right now, #2 is a little kinked though since it came off of my parts car.

I think some of my problem might be that little air filter that is installed on it right now. Thing looks like it has 200k on it. I need to try and see if my civic air box will bolt into it...

is the D16Y8 header hard to come by, and about how much are we talking?

K2e2vin · 08-08-2008, 03:18 PM

I don't know what USDM cars it comes on, but shouldn't be too hard to come by. I'd say you can get one for about $30-$40.

08-08-2008, 12:49 PM	#1
caboose I still know everything Join Date: Aug 2008 Location: Hamilton, MI Age: 20 Posts: 311 iTrader: 0 / 0% Ride: 89 CRX HF, 96 Accord EX, 88 Dodge Daytona Shelbyz T-tops Rep Power: 13	Small tube Headers I have a megan racing header and cat back exhaust on my D15B6. I heard that the larger tube header might be causing me to loose low end torque and therefore lower my gas mileage. Do you think that this might be a problem? Does anyone make a smaller tube header at a low price? __________________ Formerly the.original.kermit Back from the dead... twice I NEED PARTS!!! http://hondaswap.com/parts-sale-trade-wanted/wtb-1989-crx-parts-161172/#post1079066 Check out my progress... http://hondaswap.com/auto-multi-media/my-1989-crx-project-144941/

08-08-2008, 01:57 PM	#3
K2e2vin Senior Member Join Date: Jan 2003 Location: Raleigh, NC Age: 21 Posts: 5,251 iTrader: 2 / 100% Ride: 88 Honda Civic HB Rep Power: 89	The 4-2-1 vs. 4-1 header thing is a myth. Tube size plays a role in that(there's a bunch of dynos that show they can perform the same). I believe your best bet would be the tubular D16Y8 header that's in the Acura EL and maybe in some other Y8s. BTW; I got 57mpg hwy using a Z1R header(ebay 4-1 header) in a D15B VTEC cruising at 4000rpm(~70mph). __________________ 1988 Honda Civic STD-more mods than I want to list Terrorists have successfully attacked our imagination. RIP Jon Eban Nie, August 31, 1991 - May 7, 2006 Y-Daniel Siu Eban, September 7, 1986 - May 7, 2006

08-08-2008, 02:50 PM	#4
caboose I still know everything Join Date: Aug 2008 Location: Hamilton, MI Age: 20 Posts: 311 iTrader: 0 / 0% Ride: 89 CRX HF, 96 Accord EX, 88 Dodge Daytona Shelbyz T-tops Rep Power: 13	my HF is only getting 45ish on a tank... I would think that I should see a little better from it. It's a 4-2-1 megan on there right now, #2 is a little kinked though since it came off of my parts car. I think some of my problem might be that little air filter that is installed on it right now. Thing looks like it has 200k on it. I need to try and see if my civic air box will bolt into it... is the D16Y8 header hard to come by, and about how much are we talking? __________________ Formerly the.original.kermit Back from the dead... twice I NEED PARTS!!! http://hondaswap.com/parts-sale-trade-wanted/wtb-1989-crx-parts-161172/#post1079066 Check out my progress... http://hondaswap.com/auto-multi-media/my-1989-crx-project-144941/

08-08-2008, 03:18 PM	#5
K2e2vin Senior Member Join Date: Jan 2003 Location: Raleigh, NC Age: 21 Posts: 5,251 iTrader: 2 / 100% Ride: 88 Honda Civic HB Rep Power: 89	I don't know what USDM cars it comes on, but shouldn't be too hard to come by. I'd say you can get one for about $30-$40. __________________ 1988 Honda Civic STD-more mods than I want to list Terrorists have successfully attacked our imagination. RIP Jon Eban Nie, August 31, 1991 - May 7, 2006 Y-Daniel Siu Eban, September 7, 1986 - May 7, 2006

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08-08-2008, 01:44 PM	#2
t3t4delsol Senior Member Join Date: Mar 2008 Location: York, Pa Age: 25 Posts: 607 iTrader: 0 / 0% Ride: 97 del sol si turbo / dd is a 95 eclipse gsx Rep Power: 11	is the header a 4-2-1 or a 4-1, the 4-2-1 are better for low end torque, the 4-1 is better for higher rpm

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