headers
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headers
so i'm lookin into some heads. i think i'm going to go with the 4-1. i'm lookin around at different places and one thing by lookin at them is kinda confusing me. you see the heads that come together up higher, closer to the motor. and then you see the ones that connect much further down. what's the difference? is one going to make it louder, more power, or anything?
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Long tube vs. short tube. Long tubes will make more power in theory, but on this heap of crap, its probably 1 or 2 HP. The hamsters don't care much about the header.
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Rep Power: 0 on our motors...any bolt on mods will do very little. no point on getting bolt ons. especially if you have an auto. i have an auto with I/H/E and trust me...im not very happy with it. save up and do a k20a2 engine swap or turbocharge the **** out of your car. 
but if you really want header then i would look into the DC sport header.
but if you really want header then i would look into the DC sport header. 
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Rep Power: 0 Also if you do want to waste some cash on a header get a 4-2-1 they make better low end power where as 4-1 make high end power. The D17 is a low end motor (i.e. not makeing good power after 6k)
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Rep Power: 0 your log in name is turbo_civic so turbo ur civic! j/k but the best you can do with a header is get a sound you like, Ive had 2 types of headers, DC sport, and Kamikaze and by far the kamikaze sounds a lot better IMO
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From: NV
Rep Power: 812 Actually honda engines are known as hi revving motors. You can get hp up real quick, its the torque that takes work. A header is really a waste unless you have some head porting done which I assume you don't. Whats the point of going from small port, to big header, back to small downpipe? The only thing it will do is slow down the air and cause power loss. In short, it doesn't need or benefit from a larger header.
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Rep Power: 0 i was basically just going for the sound area. i kinda figured that there wasn't going to be much power out of it so i was lookin for sound that was gonna get it loud. which would be louder, 4-1 or 4-2-1?
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Originally Posted by gearbox
Actually honda engines are known as hi revving motors. You can get hp up real quick, its the torque that takes work. A header is really a waste unless you have some head porting done which I assume you don't. Whats the point of going from small port, to big header, back to small downpipe? The only thing it will do is slow down the air and cause power loss. In short, it doesn't need or benefit from a larger header.
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well turbo_civic i don't know if you have an EX or LX/DX but heres my 2c.
assuming you have an EX:
your going to have a hell of a lot more sound out of a 4-2-1 header because it eliminates the cat. 4-1 would just attach to the cat and you would have header, cat, exhaust. also if you live in CA. it's illegal to not have a cat.
assuming you have a DX/LX
well if you have this model of civic then the cat is on the header which means you only have one choice of header which is 4-1 because the exhaust already reaches to your header.
well turbo_civic i don't know if you have an EX or LX/DX but heres my 2c.
assuming you have an EX:
your going to have a hell of a lot more sound out of a 4-2-1 header because it eliminates the cat. 4-1 would just attach to the cat and you would have header, cat, exhaust. also if you live in CA. it's illegal to not have a cat.
assuming you have a DX/LX
well if you have this model of civic then the cat is on the header which means you only have one choice of header which is 4-1 because the exhaust already reaches to your header.
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Rep Power: 0 i've got a EX with thermal catback. i live in Missouri and i'm not sure but i think here we have to have a cat. i'm not worried about gettin pulled over for it and checked cause i doubt the cops here will get their lazy a$$ that low to the ground lol, it's just passing all the tests that i will need to pass. would i better off getting a shorter 4-1 header and a high flow cat?
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Originally Posted by mkingk2
You shouldn't be allowed to drive a car.
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Rep Power: 0 thank you gearbox. you get rep wether i truly am in the right or not. If i'm not in the right i'd like to know why. It just seems like a general oberservation i've made is that most SOHC engines aren't all that high revving compared to the 8100rpm redline of say an 05 RSX type S. granted this isn't proper scientific method because i didn't explore and experiment. But hey i figured this is the real world why not state conjecture as fact. So i did. And i'm sorry for it.
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Rep Power: 336 ok, if you are going to get a header, try to get one thats ceramic coated, cause it stays cooler.
now to get off topic. redline on a d17 is 6800 rpm. and the k20az is 8100 cause thats how they were ECU programmed. we can raise our rev limit if its done properly. stock, they aren't meant to be AS high as DOHC motors. BUT, d17s are higher than alot of other 4bangers out there. like the 2.2 GM motor. or the 1.5 DOHC xa/xb scion motor which redlines at 6k. i mean its all what the car company wants to do.
now to get off topic. redline on a d17 is 6800 rpm. and the k20az is 8100 cause thats how they were ECU programmed. we can raise our rev limit if its done properly. stock, they aren't meant to be AS high as DOHC motors. BUT, d17s are higher than alot of other 4bangers out there. like the 2.2 GM motor. or the 1.5 DOHC xa/xb scion motor which redlines at 6k. i mean its all what the car company wants to do.
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Originally Posted by caorndorff
You shouldn't be allowed to post.
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Rep Power: 812 if anyone wants, I'll have a ceramic kamikaze header for EX for sale $218 shipped cause they go for $350 new and its still in good shape. It keeps heat out and works very well ( i believe pipes are equal length). I'm going back to stock and saving for turbo, so I don't need it anymore.
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Originally Posted by MajinB
ok, if you are going to get a header, try to get one thats ceramic coated, cause it stays cooler.
now to get off topic. redline on a d17 is 6800 rpm. and the k20az is 8100 cause thats how they were ECU programmed. we can raise our rev limit if its done properly. stock, they aren't meant to be AS high as DOHC motors. BUT, d17s are higher than alot of other 4bangers out there. like the 2.2 GM motor. or the 1.5 DOHC xa/xb scion motor which redlines at 6k. i mean its all what the car company wants to do.
now to get off topic. redline on a d17 is 6800 rpm. and the k20az is 8100 cause thats how they were ECU programmed. we can raise our rev limit if its done properly. stock, they aren't meant to be AS high as DOHC motors. BUT, d17s are higher than alot of other 4bangers out there. like the 2.2 GM motor. or the 1.5 DOHC xa/xb scion motor which redlines at 6k. i mean its all what the car company wants to do.
You would need alot, alot, alot, alot of internal work to get a d17 to rev to 8k or more. not just a new ecu. Even if you did build a high reving d17 it would be a waste of money. Peak Hp happens at 6100rpm (d17a1) and 6300rpm (d17a2) stock, so after that your powerband sinks, so why rev past that, your loseing power. The k20a2 on the other hand hits peak power at 7800 rpm so it has a reason to be reving in that range.
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Originally Posted by booba5185
whoa, let's calm down, i quoted you, but this isn't directed at you, i just did so we knew what subject i was talkin about, that guy is prolly used to ur standard v8\v6 that doesn't know what 6k rpms is, get's in his honda, see's 7-8k redline and gets a hard-on.
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Originally Posted by gearbox
my auto EX peaked at 6800rpm when i had i/h/e pnp head, cam gear -1.5
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Originally Posted by MajinB
that was my point. just cause its power peak is 6300 don't mean redline it.
Yes, yes it dose. Because the engine is inefficient at that point. But all aside even if you could make a d17 rev up high, it would blow up. The valve springs are not stiff enough, the rods are too small, and the list goes on and on and on.
Go on Honda-tech.com and tell them you want to build a high revving d17. This will he their reaction
Here look at this n/a d17 dyno
http://www.kandn.com/dynocharts/57-3513.jpg
Only too guesses to where the horsepower is heading after 6200
Here is a hint
Don't believe everything u hear caorndorff, when I talk about revving high, I mean 9-11k. I have seen both sohc and dohc motors in range.
These guys don't make peak hp anywhere close to 6200-6300 rpms.
I don't remember his name but there is someone on this site that has his d17 revving easily past 9k.
These guys don't make peak hp anywhere close to 6200-6300 rpms.
I don't remember his name but there is someone on this site that has his d17 revving easily past 9k.
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Originally Posted by mkingk2
Don't believe everything u hear caorndorff, when I talk about revving high, I mean 9-11k. I have seen both sohc and dohc motors in range.
These guys don't make peak hp anywhere close to 6200-6300 rpms.
I don't remember his name but there is someone on this site that has his d17 revving easily past 9k.
These guys don't make peak hp anywhere close to 6200-6300 rpms.
I don't remember his name but there is someone on this site that has his d17 revving easily past 9k.
