Do anyone here have dyno sheet comparing Comtech Street 2.25" header and stock 2.25" header on ITR???? what are the gain/loss on hp & torque. deciding whether it's worth $500 to purchase 1.

 

ur better off going with a dc jdm 4-1 or just a jdm 4-1. a bigger collector means more potential. dont waste ur money on comptech too expensive with no gains imo..

 

i do/did have DC JDM 4-1 and they suck

1) collector is so big that air flows straight up to the rear bumper that it made black sh*t over the paint

2) decreases torque

3) o2 sensor reads all retarded

4) kills your fuel mileage

5) DC sux


Modified by integrasi at 8:58 AM 7/26/2004

 

bump any1?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by integrasi &raquo;</TD></TR><TR><TD CLASS="quote">i do/did have DC JDM 4-1 and they suck

1) collector is so big that air flows straight up to the rear bumper that it made black sh*t over the paint</TD></TR></TABLE>

The collector has Nothing to do with this. Did you have a cat in place.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">2) decreases torque</TD></TR></TABLE>

Never saw this. Yours is the first report I've seen, got any graphs to compare.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">3) o2 sensor reads all retarded</TD></TR></TABLE>

Retarded? Not exactly scientific. Dunno why unless it was damaged upon install or was going bad or went bad in some way, the header should have nothing to do with this.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">4) kills your fuel mileage</TD></TR></TABLE>

Not in my experience, my gas mileage actually improved, you sure this isn't attributed to more aggressive or abusive driving just because the mod was added.


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">5) DC sux</TD></TR></TABLE>

I remember when DC was the ****. But, don't forget that he also mentioned the STOCK OEM JDM ITR 4-1 Header.

Might be old but still worth showing or mentioning in this instance:

http://bob123e.tripod.com/thegreatheadertest/

Here's the Comptech 4-2-1:



And heres the JDM DC 4-1:



And finally the JDM ITR 4-1:




Of course results may vary with different cars/motors.


And no bumping in this forum btw.

 

I don't know where you are getting those ideas about the DC. My only complaint is that it hangs too low. As long as the car is properly tuned, it will run great.

 

I just looked at "The Great Header Test" and they show Comptechs header making the exact same peak HP as the DC JDM header. Ruffly 11whp more than stock.

I dont know the specifics as to whether it was bolted up to a regular cat, or 2.5'' cat though.

 

Please excuse Young, he's been known on Clubsi to use poor judgement, buy expensive parts, buy useless parts, and do his own installs without proper tools or experience.

Young-

Do some searching, now that you have that motor in the car, please do things right

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jond &raquo;</TD></TR><TR><TD CLASS="quote">I just looked at "The Great Header Test" and they show Comptechs header making the exact same peak HP as the DC JDM header. Ruffly 11whp more than stock.

I dont know the specifics as to whether it was bolted up to a regular cat, or 2.5'' cat though.</TD></TR></TABLE>

Here's the notes I saved about that:

"Just some info about the Comp Tech piece at the header test. It was the only stock bolt on header tested (except the stock manifold) and therefore needed it's own test pipe to bolt up to the 2-1/2" system used. The test pipe was stepped from 2-1/4" to 2-1/2" to bolt to the cat back system. A 2-1/4" flex joint works perfectly on a 2" collector donut. All the other headers had JDM type collectors and used a full 2-1/2" test pipe. "

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by NBP #0933 &raquo;</TD></TR><TR><TD CLASS="quote">Here's the notes I saved about that:

"Just some info about the Comp Tech piece at the header test. It was the only stock bolt on header tested (except the stock manifold) and therefore needed it's own test pipe to bolt up to the 2-1/2" system used. The test pipe was stepped from 2-1/4" to 2-1/2" to bolt to the cat back system. A 2-1/4" flex joint works perfectly on a 2" collector donut. All the other headers had JDM type collectors and used a full 2-1/2" test pipe. "</TD></TR></TABLE>

Awesome!!!
Was the stock manifold also hooked to the 2.5'' exhaust?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cruzersi00 &raquo;</TD></TR><TR><TD CLASS="quote">Please excuse Young, he's been known on Clubsi to use poor judgement, buy expensive parts, buy useless parts, and do his own installs without proper tools or experience.

Young-

Do some searching, now that you have that motor in the car, please do things right </TD></TR></TABLE>


at least mine is faster than yours

 

keep in mind this forum is comptech vs. stock damn it. NOT comptech vs. DC 4-1

 

i'm pretty happy with my dc jdm 4-1, at least until i get my smsp header

 

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

Awesome!!!
Was the stock manifold also hooked to the 2.5'' exhaust?</TD></TR></TABLE>

Good question but I don't know the answer. I imagine it should have been. That way the header would be the only part of the system that changed.

Does anybody else know? SMSP? Sackdz?

 

i am almost tempted to post up some pictures of comptech header

eh **** it, why not










Features-

-Ground Clearance: Offers the best groundclearance for the power made
-Carb EQ #- PERFECTLY legal
-quality, Stainless steel w/ tig welds- Will last pretty much forever- wont crack like others
-design, stepped primaries, 4-2-1- makes good power, compact design- BOLTS to factory cat. Dont need to modify exhaust or cat.

Not everyone is just looking for the biggest HP #

Comptech, while having great daily driven characteristics happens to make more power then any other "Bolt on" header that I know of.

 

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


at least mine is faster than yours </TD></TR></TABLE>

I'd love to run it at the track and see Young

That means you'll need more than an engine, mods, and your mouth.

 

More power than the Toda?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cruzersi00 &raquo;</TD></TR><TR><TD CLASS="quote">More power than the Toda?</TD></TR></TABLE>


toda has a 2.5" collector

Not bolt on.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cruzersi00 &raquo;</TD></TR><TR><TD CLASS="quote">More power than the Toda?</TD></TR></TABLE> the car is making close to 200whp as of 7/21/04

 

Young-

If this is truley the case then listen to everybody and upgrade to 2.5" collector header like the JDM 4-1 or JDM DC 4-1.

The comptech may not have enough flow for your "built" engine.

So if you're pushing 200whp, that means that you did cams on your b18c5? Does this also mean you paid someone to tune it?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cruzersi00 &raquo;</TD></TR><TR><TD CLASS="quote">Young-

If this is truley the case then listen to everybody and upgrade to 2.5" collector header like the JDM 4-1 or JDM DC 4-1.

The comptech may not have enough flow for your "built" engine.

So if you're pushing 200whp, that means that you did cams on your b18c5? Does this also mean you paid someone to tune it?</TD></TR></TABLE>

is it just me or u??? you have been missing on club si meets????? i have had jdm dc4-1 for almost 6 months. now i want something new. yes i just got some top secret cams & no i haven't tuned

 

I dyno'd 171.xx and 123.xx with an AEM and my comptech 4-2-1. Im in no rush to change mine until I can afford a high end header like SMSP or Toda

 

First, I should clarify that neither the OEM manifold nor the Comptech header have 2.25" collectors -- both are 2.00" OD. Secondly, while you may not appreciate most of the advice you've received here so far, it is indeed very useful. If you already have a DC JDM 4-1, and your setup is making the power you stated it is (in other words, a decently healthy build), the Comptech street header will quite simply be a step-down in terms of performance. The only advantages it offers are its CARB legality, its better ground clearance, and its arguably better build quality. If you're looking for something better, you'll have to look towards the more high-performance headers, such as SMSP, DTR, Toda, Comptech race, etc.

 

hey "irev210"... are you the same guy selling pistons on ebay?

 

Member "Austin" is an expert when it comes to Comptech.