Is a header worth it??

[Phatwhippin_CRX]

Originally posted by VTEC_boi


http://www.automotiveforums.com/vbulletin/t13199.html

^^Read up my friend

Anyways, I think a header is very much worth it. Just as long as you don't plan on going turbo.

peace
boi

Like Dez said, it's a blanket statement that does NOT apply to all cars...


ESPECIALLY small displacement, no torque Hondas that need to rev HIGH to make any power. Our small economy cars NEED backpressure to produce any kind of low end torque.......... which is what makes cars move, HP is what makes them fast.......

[Phatwhippin_CRX]

Originally posted by madtownhonda


yep, that thread explains the entire thing..thanks for posting that link

Un-bolt your exhaust at the header and drive around for a week like that, then tell me where your low-end power goes. Trust me, I drove around like that for a week and the car couldnt move out of its own damn way until 4800 rpms when it just pulled like a bat out of hell.

For a full out drag car, backpressure = bad

Daily driven? you need it.....

[Ktulu]

That just doesn't go for 4 bangers. I frequently check out the windsor (5.0L and 5.8L found in mustangs) forum at corral.net and they also say you need backpressure. There are some really intellegent people there that could explain to you why you need it.
Anyway,
Ktulu

[ric]

backpressure on any car is bad no matter what the condition period.

Q. do you know why you loose low end power when you remove your exhaust at the header?

A. an exhaust system doesnt exist soley to provide sex appeal my friends and nor does it exist to provide backpressure. what it does exist for is its scavanging capabilities. at a low rpm the cat back section is necessary for keeping the egts up and creating a path for exhaust to travel so the velocity remains high and it can scavange the exhaust behind it and pull it forward towards the muffler where at that point it will be expelled. the cat back is in essence a suction pump for exhaust gas in the lower rpm range because it doesnt have the velocity on its own to move freely out of the system. take the header off at low rpm and you are actually creating backpressure from the turbulance of not having a controlled flow or not having any suction to pull recently expelled gases out of the header. all this leads to reversion which is why you have shit for power if you take it off at the header.

you need the catback not to create backpressure, you need it to help scavange your header in the low rpm range. after a given point in the rpm scale a catback or any exhaust becomes a restriction because the rapidly increasing rpm which means rapidly increasing flow volume of exhaust gas has enough velocity of its own to push gas out of the header. a perfect system would have the whole exhaust on untill a switchover point where it would switch to an open header. unfortunatly noise and emissions laws and general stupidity prvent that from happening.

if ya dont believe it then i can let you talk to some mechanical engineers that are friends of mine and they can get way more technical to clarify anything for you.

[VTEC_boi]

thanks for the backup Rick hehehe

[Si2000 Vtec]

Apparently the new JG Header pumps out 13 hp to a B18C1??? I guess Import Tuner dyno'd it at that much. That's a lot of power, the draw-back is it cost around $600. I think if I get a header, I'll get a 2.5" collector'd Type-R Header... Better dyno results than DC, and its HONDA OEM.

[sindogg]

if not planning on going turbo get the header.

[Dezoris]

Originally posted by i like naked girls
backpressure on any car is bad no matter what the condition period.

Q. do you know why you loose low end power when you remove your exhaust at the header?

A. an exhaust system doesnt exist soley to provide sex appeal my friends and nor does it exist to provide backpressure. what it does exist for is its scavanging capabilities. at a low rpm the cat back section is necessary for keeping the egts up and creating a path for exhaust to travel so the velocity remains high and it can scavange the exhaust behind it and pull it forward towards the muffler where at that point it will be expelled. the cat back is in essence a suction pump for exhaust gas in the lower rpm range because it doesnt have the velocity on its own to move freely out of the system. take the header off at low rpm and you are actually creating backpressure from the turbulance of not having a controlled flow or not having any suction to pull recently expelled gases out of the header. all this leads to reversion which is why you have shit for power if you take it off at the header.

you need the catback not to create backpressure, you need it to help scavange your header in the low rpm range. after a given point in the rpm scale a catback or any exhaust becomes a restriction because the rapidly increasing rpm which means rapidly increasing flow volume of exhaust gas has enough velocity of its own to push gas out of the header. a perfect system would have the whole exhaust on untill a switchover point where it would switch to an open header. unfortunatly noise and emissions laws and general stupidity prvent that from happening.

if ya dont believe it then i can let you talk to some mechanical engineers that are friends of mine and they can get way more technical to clarify anything for you.

Bla bla, the point is dynos show they don't do shit on civics , you can get as technical as you want, including moisture levels in the atmosphere, tempereature, atmoization of fuel in the combustion process. But is still does not take away the fact on a stock motor, especially the SOHC civics lose power using 4-1 headers on 70% of the rev band and 4-2-1s produce minor gains, when combined with an exaust you'd be lucky to get 6 HP at the wheels and that is not noticable.

[ric]

Originally posted by Dezoris

Bla bla, the point is dynos show they don't do shit on civics , you can get as technical as you want, including moisture levels in the atmosphere, tempereature, atmoization of fuel in the combustion process. But is still does not take away the fact on a stock motor, especially the SOHC civics lose power using 4-1 headers on 70% of the rev band and 4-2-1s produce minor gains, when combined with an exaust you'd be lucky to get 6 HP at the wheels and that is not noticable.

agreed on for a civic (unless its supercharged). but larger motors can greatly benefit from them.

[delsolguy]

Originally posted by Si2000 Vtec
I'll get a 2.5" collector'd Type-R Header... Better dyno results than DC

http://www.automotiveperformanceengi...om/header.html

Might wanna compare the graphs....