I contacted altered atmosphere near me for a custom exhaust as the greddy evo2 has too small of an internal diameter. I am thinking about getting a 2.75 or 3.0" custom exhaust match to the stock piping layout but with the muffler angled like a N1 exhaust. The piping is 16 gauge stainless steel and it will be tig welded. I have heard our motors make power at 2.75" and above. So what do you think?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by spoonlongblock &raquo;</TD></TR><TR><TD CLASS="quote">I contacted altered atmosphere near me for a custom exhaust as the greddy evo2 has too small of an internal diameter. I am thinking about getting a 2.75 or 3.0" custom exhaust match to the stock piping layout but with the muffler angled like a N1 exhaust. The piping is 16 gauge stainless steel and it will be tig welded. I have heard our motors make power at 2.75" and above. So what do you think?</TD></TR></TABLE>


1. If your not driving a supra, or skyline , angled mufflers make you look like a toolbox
2. 2.75 or 3" piping is TOO big for N/A setup Its been proven by a few places
( one being the guys at ToV that the OEM piping is PERFECT for the k20z3.
3. See Number 1


^ This is my personal opinion 1 & 3


oh and where have you heard that that big of piping makes power
i'm very very very very curious on this

considering you work at lexus

 

you will lose power.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Type X &raquo;</TD></TR><TR><TD CLASS="quote">
2. 2.75 or 3" piping is TOO big for N/A setup Its been proven by a few places
( one being the guys at ToV that the OEM piping is PERFECT for the k20z3.
</TD></TR></TABLE>

There was a site sponsor on FGcoupe.com that tested and found that 2.75" inner diameter on the K20z3 is perfect (or works the best) I'd have to spend time search for it ... but yeah...

And i beg to differ that the OEM piping is an adequite enogh size for power. I mean it's not that bad for stock actually, pretty damn good. Matter of fact, Sean (of TOV) was complaining that the DCRH/Exhaust piping size is just not large enough either (not sure what the size difference is between DC and OEM)

EDIT: after some searching (which eventually stopped cuz the site stopped responding) I think the guy that did that testing was Tuning Factory Inc.... which while I was searching, you hella pwned him on the OEM navi unit (retro)

So while you think 2.75" is too big, then why would Type One Racing come out with an exhaust that big for an NA app? Can't tell me T1R doesn't have a clue

All in all I could be completely off here, but I'm just throwing in my 2cents


Modified by SeanJohn1802 at 12:52 PM 9/18/2006

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SeanJohn1802 &raquo;</TD></TR><TR><TD CLASS="quote">

There was a site sponsor on FGcoupe.com that tested and found that 2.75" inner diameter on the K20z3 is perfect (or works the best) I'd have to spend time search for it ... but yeah...

And i beg to differ that the OEM piping is an adequite enogh size for power. I mean it's not that bad for stock actually, pretty damn good. Matter of fact, Sean (of TOV) was complaining that the DCRH/Exhaust piping size is just not large enough either (not sure what the size difference is between DC and OEM)</TD></TR></TABLE>

http://www.nsxprime.com/FAQ/Mi...y.htm

this is for the nsx but rear PIPE SIZING ...


http://www.hondanews.com/catID...e=asc

 

Welll is this for a Hondata reflashed car? built motor?

for Intake, Header etc
Personally i dont find ANY fault with the "oem Equipment"

for Hondata.. I would upgrade since they input tons of dyno time and state which mods are REQUIRED to achieve max power

 

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

http://www.nsxprime.com/FAQ/Mi...y.htm

this is for the nsx but rear PIPE SIZING ...


http://www.hondanews.com/catID...e=asc</TD></TR></TABLE>
thats a lot of reading But I don't know how you can compare an NSX motor to a Civic Si motor (if thats what your trying to do?) I'll admit I don't know too much about NSX, but I do know your trying to compare apples and orages lol

also the 2nd link there, all it states is. .
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">By employing a large diameter tail pipe (60.5 mm), an exhaust flow of 105 liters per second is achieved.</TD></TR></TABLE>

Which is only 2.38 inches ... thats if they refer to the "tail pipe" as the exhaust piping and not jus the axel back portion or tip... iono... not real clear there IMHO... but on a 1.8L B-series going up to 2.5" exhaust for an ALL motor APP is what people do left and right, to me that doesn't make it a stretch for the K-series motor to utilize a 2.75" exhaust (and that's comparable as they are both Inline4 )

What size exhaust piping do folks with the RSX runs, anyone know?

 

my car is hondata reflash and as soon as ips cams out that work with our cars correctly I am going with them I was just wondering as I have seen many k series featured in articles in magazine and they have said that 2.75 is a perfect size for the k series so go as big as 3.00 as it adds more top end power with the sacifice of a little bottom end. I was just throwing the question around to get ideas

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SeanJohn1802 &raquo;</TD></TR><TR><TD CLASS="quote">

What size exhaust piping do folks with the RSX runs, anyone know? </TD></TR></TABLE>


I dont have 100 hours to read this

http://forums.clubrsx.com/showthread.php?t=228923

It all depends on application

but i see more at 2.25 than 3

 

My vote goes for 2.5" for a mildly modified k-series motor. Its a nice inbetween size which a lot of the fully built b-series guys are running who make 200whp. Are motor is 2.0L which makes roughly 200whp. I think 2.5" is good down low, and good up top. I think 2.75 and 3" would be for more radical applications. Big cams, high c/r, etc.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Type X &raquo;</TD></TR><TR><TD CLASS="quote">I dont have 100 hours to read this
</TD></TR></TABLE>
who does lol

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Type X &raquo;</TD></TR><TR><TD CLASS="quote">
but i see more at 2.25 than 3</TD></TR></TABLE>
yeah I don't know about 3" myself but 2.25" is definatley too small, in fact, based off the honda website you linked up, thats smaller than the OEM pipe

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SeanJohn1802 &raquo;</TD></TR><TR><TD CLASS="quote">
who does lol


yeah I don't know about 3" myself but 2.25" is definatley too small, in fact, based off the honda website you linked up, thats smaller than the OEM pipe </TD></TR></TABLE>

well your question was what are rsx's running ...thats the link
i didnt say 2.25 for the si

 

they are only for turbo applications plus you will lose big time low end power,i suggest you go with 2.5"

 

For N/A don't you want a smaller diameter for backpressure....Turbo setup's use bigger diameter to get rid of backpressure but correct me if i'm wrong which i'm probably wrong but don't you want to stay around 2.5 at the biggest if not a bit smaller? I have an H22a in an ej8 and i ran no cat 2.5 pipe with a 18in resonator and I made more power than a guy with same setup with 2.75 piping...

 

From everything i've read and heard, 2.5" exhaust is good for cars up to 250hp (crank). Our car with CAI/RH/E to the wheels makes roughly 205whp which is about 235 crank hp. So I think that our car probably shouldnt have a bigger exhaust then 2.5" unless of course its FI.

 

Or cams I am gonna stay N/A and gonna add cams from IPS and port and polish the head and get a valve job while I am at it. I should make about 275 crank when everything including the new exhaust and race header are completed. I would wanna run the new k pro or whatever it is for our cars