A couple of weeks ago i fited a DC Sports 4-1 header on my B16A1 engine. The two O2 sensors were welded in the same places as it is in case of a stock header, after a few minutes of driving there was an error code (nr 43 i guess). I searched the HT forum and realized that the sensors were placed in reverse order, so i placed them in the right order. Everything is now allright, no codes, but the dyno results are worse then before:
the red is for stock header, dynoed at 8 C degrees,
the other two are with DC header (the beter one is without a silencer wchich I have installed at the end of the exhaust system to reduce noise), dynoed at 29 C degrees

The rest of my exhaust system consist of 2,5 inch pipes with 2 mufflers without cat. What do You think is the reason for the power and torque lost (ecept the temperature)? I know that a 4-1 header has less torque and power in the lower RPMs, but in the higher ones it should be much better i think.
P.S. KM means HP


Modified by ArvidPolak at 6:25 AM 9/10/2005

 

ok so put some cams in it, and do the test over... go with Toda Bs or something, with their valve trian... bet the header makes a difference then.

 

2 mufflers?

 

What's wrong in having two mufflers? They have the same diameter (2,5inch) inside as the pipes. The diameter is a bit to big for a stock B16 now but with the stock header there was everything fine. I didn't know that a 4-1 DC needs more aggressive cams to give some power.

 

You only need one chief. That dual exhaust is taking away from your torque/power. With the stock header the bottle neck effect made it essentially like a single exhaust (small header/big exhaust).

 

I have a b16a Short ram cai, straight pipe back exhaust, I installed vibrant 4-1 header last week, I did notice a slight loss in low end torque but felt no gains @ the high end !! I didn't drill holes in my header I installed one o2 sensor on the bottom end of the header & the other just before the test pipe, I got no cel, but my a/f gauge does go a lil crazy. Btw, do you get a buzzing/ can like noise @ midrange rpm's?

 

that image is so small I can't see **** on it.

Are they corrected numbers? Going from 46F to 84F will make a difference...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by chri5 &raquo;</TD></TR><TR><TD CLASS="quote">that image is so small I can't see **** on it.

</TD></TR></TABLE>

Click on the image

 

damn that sux u lost power.....i put a neuspeed header on my ls and it made a noticeable difference in the smoothness of the power band.....i would def. say remove the second muffler and try again...good luck

 

yea your losing torque with two mufflers and your lossing torque with the 4-1

 

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

heh, apparently when you have images turned off it doesnt show links that were in the img tag...

 

Wow after reading this I can't wait to install my DC sports 4-2-1 header.

 

But it isn't a normal known muffler, it's like a pipe, You can see through it (****, I don't know how to explain- the muffler has a 2,5inch pipe with holes and a bigger pipe around it with fiberglass or smthg like that between the two pipes, everything to reduce some noise). The whole exhaust system is like one pipe. What's a bottle neck effect??
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Firestarter &raquo;</TD></TR><TR><TD CLASS="quote">Btw, do you get a buzzing/ can like noise @ midrange rpm's? </TD></TR></TABLE>
Yes I have the same effect at about 2800-3600rpm. Sounds scary.

P.S. Does anybody know how many HP are lost when meassuring at a 21 degrees C higher temperature??

 

well I am a junior engineering student and I was just plugin in some numbers into the ideal gas law.
I used 1.6 liters as my volume
done at sea level
29 grams per mole of air

and I discovered that at 29 degrees celsius there are 1.87 grams of air per every 1.6 liters and at 8 degrees celsius there is 2.01......

this means at 29 C there is 7.48 percent less air per unit of volume than at 8 C.....I dunno if this means anything but I had fun doing it.......please no flamin because I am just playin around with numbers
Casey

 

a header will not do the much or anything at all if you dont have any other mods.
you have to have other mods to support the flow of the header. some mods depend on each other to make the power they should.

like using a intake manifold on a stock intake there is really no point unless you have an intake also. im kinda just rambling on but in know soem epopel know what im talking about. if you get cams that would keep the intkae and exhaust ports open longer therefor making the intake manifold and header mose functional along with the exhast, intake throttle body etc.

in short get cams to notcie the real power gains and loose the dual exhaust

 

Ur losing backpressure with those two exhausts. 4 cylinders should have ONE exhaust at most. 2.3" or below for N/a, or 3" and above for Turbo. The guys above me is right, you won't notice any noticeable gains w/o the proper performance parts to go with it, eg. AEM cold air/short ram intakes (or similar) and a nice SINGLE exhaust. The camshaft helps, but it should be noticeable w/o a performance cam. Don't expect that making your exhaust flow smoother is going to give you a whole 3 seconds off your time. That's crazy!

P.S. lose the dual exhaust and get a nice magnaflow or something similar.

-Jon

 

Sorry, but dual pipes on a Honda is Gay...unless you have a V6. Unless a stock motor is choked up with factory exhaust, like on most chevy V8's, headers won't do **** unless they are complemented by other mods.

 

he doesn't have dual exhaust he just has two mufflers.....they are inline. like a cherry bomb or glasspack and I think he has too of them.....so stop flamin the poor kid.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by gnar kill &raquo;</TD></TR><TR><TD CLASS="quote">he doesn't have dual exhaust he just has two mufflers.....they are inline. like a cherry bomb or glasspack and I think he has too of them.....so stop flamin the poor kid.</TD></TR></TABLE>
Exactly! They are inline and in the same places as its i na stock CRXl.
Here is a pic ( its all a bit dirty because it was taken in winter):

One more:

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CRX-Fluffy &raquo;</TD></TR><TR><TD CLASS="quote">Don't expect that making your exhaust flow smoother is going to give you a whole 3 seconds off your time. That's crazy!</TD></TR></TABLE>
I definitely don't I counted for about 0.3 sec on a stock engine ( with a short CAI).
Ok thanks for the help, I'll put the stock header on until I buy some cams, and other stuff.

 

Well... 18bhp for exhaust isn't that bad. That's 10 more than I got with a DC 4-2-1 and OEM catback

https://honda-tech.com/zerothread?id=1366789

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Shirk &raquo;</TD></TR><TR><TD CLASS="quote">Well... 18bhp for exhaust isn't that bad. That's 10 more than I got with a DC 4-2-1 and OEM catback
</TD></TR></TABLE>
I know 4-5 owners of B16A1 EE8's in Poland, their Vtecs are real stock and the results on different dyno's are everytime over 160HP. Thats strange compared to the 150 that Honda declares. I wouldn't say the exhaust (without header) gave 18HP...

 

That isn't a good idea......very restrictive......

 

Not trying to be a jerk, but there is no such thing as a B16a1, only B16a or B16a2, etc...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by VTEC-Power &raquo;</TD></TR><TR><TD CLASS="quote">Not trying to be a jerk, but there is no such thing as a B16a1, only B16a or B16a2, etc...</TD></TR></TABLE>

theres no such thing is a JDM B16a#, but in the US there was a b16a1\2

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by VTEC-Power &raquo;</TD></TR><TR><TD CLASS="quote">Not trying to be a jerk, but there is no such thing as a B16a1, only B16a or B16a2, etc...</TD></TR></TABLE>
There are B16A1's. f.e:

That's that engine:

Every JHMEE8xx has a B16A1 engine,
EDIT: They were made for the European market.