I don't know if this topic has been covered but a friend of mine told me that I should port my JDM headers because they give a lot more HP gains. My friend recently bought JDM headers and it is in the shop getting ported right now. If anyone has done this, or heard of any gains, please let me know.

 

port the header?? thats a long *** really curved thing to be cuttin with an end mill or somethin... u could maybe polish it some, but not increase the size of the holes... well not easily anyway... how the **** would u port an entire header?!?

 

i think what he is referring to is porting the primaries. the flange is welded from the inside at the primaries. ive heard of people welding the flange on the outside then going inside to port out the old welds. thus increasing the interior diameter of the primary and also making it smoother for exhaust flow.

 

HAHAhahahahaha, wow.....that is the funniest thing i have heard all day. No you don't port the header. And no, even if you could port it there wouldn't be much of a gain from it. Maybe he was referring to the head.
edit: porting the primaries---wouldn't give you more than a hp, if that.

 

Its been done with good gains, Use the search and you shall find it.

 

https://honda-tech.com/zerothread?id=64833 this is an old thread that i went searching for. about 4 hp gain from one source. IMHO, i wouldn't think that it would give that much on a NA car. On a fi, i could believe that because of the restriction issues when more air is pushed through. Why don't you do a before and after porting dyno runs to see the gain.

 

After the header gets ported by Redzone performance in San Jose, Ca, I will let you know the results on the dyno.

 

http://www.importreview.com/re....html

can you back up your statement?

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tegmech &raquo;</TD></TR><TR><TD CLASS="quote">HAHAhahahahaha, wow.....that is the funniest thing i have heard all day. No you don't port the header. And no, even if you could port it there wouldn't be much of a gain from it. Maybe he was referring to the head.
edit: porting the primaries---wouldn't give you more than a hp, if that.</TD></TR></TABLE>

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tegmech &raquo;</TD></TR><TR><TD CLASS="quote">HAHAhahahahaha, wow.....that is the funniest thing i have heard all day. No you don't port the header. And no, even if you could port it there wouldn't be much of a gain from it. Maybe he was referring to the head.
edit: porting the primaries---wouldn't give you more than a hp, if that.</TD></TR></TABLE>
Hahahahahaha your the dumbest thing ive seen all day. if you dont know what someone is talking about just keep your mouth shut.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tegmech &raquo;</TD></TR><TR><TD CLASS="quote">https://honda-tech.com/zerothread?id=64833 this is an old thread that i went searching for. about 4 hp gain from one source. IMHO, i wouldn't think that it would give that much on a NA car. On a fi, i could believe that because of the restriction issues when more air is pushed through. Why don't you do a before and after porting dyno runs to see the gain.</TD></TR></TABLE>

So what kind of turbo are you using with that JDM 4-1.


Modified by lustedp at 8:36 PM 11/20/2003

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by lustedp &raquo;</TD></TR><TR><TD CLASS="quote">

So what kind of turbo are you using with that JDM 4-1. </TD></TR></TABLE>

He said FI, not turbo. Ever hear of a supercharger? : /

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ragejed &raquo;</TD></TR><TR><TD CLASS="quote">

He said FI, not turbo. Ever hear of a supercharger? : /</TD></TR></TABLE>

yea you ever heard of sarcasm? : /

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by lustedp &raquo;</TD></TR><TR><TD CLASS="quote">

yea you ever heard of sarcasm? : /</TD></TR></TABLE>
No sorry...

 

JDM 4-1 Integra Type-R Header VS aftermarket 4-2-1. All that this is saying is that the 4-1 Ported JDM header creates more power over the non ported 4-2-1. Not the port job itself. And ragejed, if you would read my second post you might understand that yes i did mess up and was wrong. I hadn't ever heard of doing this. So I researched the topic more indepth and didn't find a whole lot. That is why I stated that whoisdan should do a before and after dyno to actually see the difference. Its not intended to be a flame war.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tegmech &raquo;</TD></TR><TR><TD CLASS="quote">JDM 4-1 Integra Type-R Header VS aftermarket 4-2-1. All that this is saying is that the 4-1 Ported JDM header creates more power over the non ported 4-2-1. Not the port job itself. And ragejed, if you would read my second post you might understand that yes i did mess up and was wrong. I hadn't ever heard of doing this. So I researched the topic more indepth and didn't find a whole lot. That is why I stated that whoisdan should do a before and after dyno to actually see the difference. Its not intended to be a flame war.
</TD></TR></TABLE>

Click edit on your post, then click delete if you messed up then.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ragejed &raquo;</TD></TR><TR><TD CLASS="quote">

He said FI, not turbo. Ever hear of a supercharger? : /</TD></TR></TABLE>

Even then, I wouldn't use this header with an S/C.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 96dc2 &raquo;</TD></TR><TR><TD CLASS="quote">

Even then, I wouldn't use this header with an S/C.</TD></TR></TABLE>
Neither would I.

 

why wouldn't you use it with a s/c. My thinking is that if it flows the best it would be most suitable for a s/c.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tegmech &raquo;</TD></TR><TR><TD CLASS="quote">why wouldn't you use it with a s/c. My thinking is that if it flows the best it would be most suitable for a s/c. </TD></TR></TABLE>

I'm pretty sure the Kamikaze header runs about the same price and performs much better, without porting

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by lustedp &raquo;</TD></TR><TR><TD CLASS="quote">

yea you ever heard of sarcasm? : /</TD></TR></TABLE>

Haha, some funny ****.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tegmech &raquo;</TD></TR><TR><TD CLASS="quote">why wouldn't you use it with a s/c.

My thinking is that if it flows the best it would be most suitable for a s/c. </TD></TR></TABLE>

Long primary tubed header + SC =
You want short primaries on an SC header (ala Kamikazee and Hytech's very successful designs) NOT long primaries like the JDM ITR header.

Your "thinking" cannot (and should not) be applied universally to all engine packages. Just because a header works well with one engine doesn't mean it will work better on another engine package.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BlueTeg &raquo;</TD></TR><TR><TD CLASS="quote">

Long primary tubed header + SC =
You want short primaries on an SC header (ala Kamikazee and Hytech's very successful designs) NOT long primaries like the JDM ITR header.

Your "thinking" cannot (and should not) be applied universally to all engine packages. Just because a header works well with one engine doesn't mean it will work better on another engine package.</TD></TR></TABLE>

well said

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by whoisdan &raquo;</TD></TR><TR><TD CLASS="quote">I don't know if this topic has been covered but a friend of mine told me that I should port my JDM headers because they give a lot more HP gains. My friend recently bought JDM headers and it is in the shop getting ported right now. If anyone has done this, or heard of any gains, please let me know. </TD></TR></TABLE>

In regards to how to port the primary flange area....heres what Dave of SMS had to say:

You don't want to have the exhaust port on the head exactly matched to the manifold/header...I've been told to have the header port about 1mm (.039") larger all around the head port and no larger than 1/16". This provides an anti-reversion attribute to the header. The same goes for steps in the individual tubes.

The performance gains are minimal, but better than nothing.
[shrugs shoulders]