I'm lookin for a better header design and/ or ideas on how to make it better. I currently have a Neuspeed N2. I've been reading the last thread about the h22 headers and wonder if the lack of r&d funding would effect the h23 as well. Besides equal length primaries, what other design changes would benefit the h23? IE, for a ground-up h23 header build what would you do and why?

Also, some good header dynos would also be appreciated.

 

bump

 

i was planning on using a kamikaze.

why?

cheap, comes in black, 2.5" collector, haven't heard horror stories like DC sports

 

Yeah I have a Kamakazi its seems to be good only for supercharged motors. I had it on my h23a and it seemed the car would pull pretty good at high end, but loss a lot of torque on the low end. Not really a good header if you only have a few modifcitations like Intake and Exhaust. Will sell you mine don't use it anymore PM me.

 

2.5" collecter?!?! That seems a bit large for nonvtec. How long are the primaries and whats the inside diamiter?

 

Stock, unless you make the strongest n/a H23 ever made.

The stock H23 header is very good from the factory, and unless you start making some huge modifications, it will suffice for almost all builds.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LudeyKrus &raquo;</TD></TR><TR><TD CLASS="quote">Stock, unless you make the strongest n/a H23 ever made.

The stock H23 header is very good from the factory, and unless you start making some huge modifications, it will suffice for almost all builds.</TD></TR></TABLE>

or running nitrous....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SUB-0 H23 &raquo;</TD></TR><TR><TD CLASS="quote">

or running nitrous.... </TD></TR></TABLE>

Not even with nitrous. If you actually go w/ a huge header just to perform while on the bottle, then your everyday-driving off the bottle is going to suck.

 

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

Not even with nitrous. If you actually go w/ a huge header just to perform while on the bottle, then your everyday-driving off the bottle is going to suck.</TD></TR></TABLE>

well it sucks anyways LOL... we will see what happens when i get the "huge header" . stay tune....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LudeyKrus &raquo;</TD></TR><TR><TD CLASS="quote">Stock, unless you make the strongest n/a H23 ever made.

The stock H23 header is very good from the factory, and unless you start making some huge modifications, it will suffice for almost all builds.</TD></TR></TABLE>

Are you joking? The stock H23A header is terrible, its not even tubular like the factory H22 header. DC Sports is dyno proven to gain 6whp on the H23A from an old dyno posted on vtec.net back in the day. That's pretty good for a motor which doesn't shine in the high revs. Gains were throughout the band in TQ and HP. Try comparing it to a stock H22 header and you'll see a big difference. If anything the H22 header is a well designed stock piece. It is actually a tubular manifold.

 

good info. i did not think dc would produce those kinds of gains on the h23 on its own.

 

well, my h23a didn;'t come w/ a manifold when i got it, and itd be cheaper and easier to get a nice aftermarket replacement. im thinking about using the bottle this summer.

this engine w/ have my web cams and aem gears, intake, trust sp exhaust, gutted cat, probably a UR crank pulley and that nextgear intake manfiold gasket if that ****** ever emails anyone back.

it's all in an accord, so i figure the 2.5" collector will give me the top end power that i want and just enough torque to get off the line faster than the no torque wonder "high hp" civics.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mike95lude &raquo;</TD></TR><TR><TD CLASS="quote">

Are you joking? The stock H23A header is terrible, its not even tubular like the factory H22 header. DC Sports is dyno proven to gain 6whp on the H23A from an old dyno posted on vtec.net back in the day. That's pretty good for a motor which doesn't shine in the high revs. Gains were throughout the band in TQ and HP. Try comparing it to a stock H22 header and you'll see a big difference. If anything the H22 header is a well designed stock piece. It is actually a tubular manifold.</TD></TR></TABLE>

Funny you say that; I have also seen 2 dyno's of H23 Preludes w/ many more mods, one of which was a DC Sports CC header, and it didn't even gain 10 HP w/ all of the other mods listed! Unless I see another dyno proving otherwise, I stand by my opinion that an H23 header is not a very cost-effective mod.

 

Major modifications aren't an issue. If theres not a decent one on the market I was going to fab one up where I work.

So yea or nae on the DC? I've never seen any dynos for the h23 except for mine or an h23vtec which doesn't count. Does anyone know where I can find dynos or does anyone have an h23 aftermarket header they can give me measurments from?

Ya know, for having the most sales out of the 4g Ludes, theres really very few of us h23ers around. Its all h22 this, h22, h22....

 

well i perform a search on PO.com and found one dyno graph that showed:
------------------------------------------------------------------------------------------------
Dyno results of my '92 Si that was done on July 28, 2003.

Car: 1992 Prelude Si

Milage: &gt;200K miles

Mods: AEM CAI, DC Sports 4-2-1 CC Headers, Greddy SP Cat-back Exhaust

Stock power: 133.8 WHP @ 5600 rpm, 130.0 Ft-lbs @ 4750 rpm

After mod power: 147.9 WHP @ 6200 rpm, 139.7 Ft-lbs @ 5250 rpm
------------------------------------------------------------------------------------------------
ill post the dyno graph later if you guys want me too...

BTW there was a report on an old comparison on vtec.net that showed on fresher motor that produce 155whp and 157 wtq. but unfortunately the site is down when i checked. not bad if you ask me.

 

200k miles must have a big effect! I had 149.9hp and 146tq with an Iceman cold air, Stillen fpr, Neuspeed headers, and DC exhaust. The car only had about 60k on it though.

I know for a fact that the Iceman set up sucks donkey butt and I've replaced it with a Top Fuel. I've read that the DC exhaust is actually pretty good and that the Neuspeed N2 header was modeled after the DC. Does anyone know if this is true?

 

^^^ does the neuspeed header have carb exempt #?

 

Yes it does. Why do you ask?

 

that is one factor that i need to consider when purchasing a header for my car. to my knowledge dc were the only ones w/ carb #s. so how do you like neuspeed? how does it compare to dc?

 

my friend is looking into different headers for his h23 it will only have light mods for now but what kind of header do you reccomend? and as for the kamikaze what kinds of gains can be made up top over the DC?

 

Yeah I'll sell you my Kamakazi, and dyno test it out. I have only heard about gains on a supercharged motor, and when I had it on it did seem like I had any gains until I hit near the fuel cut-off.