My exhaust is on. . . needs a few adjustments though. . . [Archive] - Club RSX Message Board

: My exhaust is on. . . needs a few adjustments though. . .


chunky
01-27-2005, 11:12 PM
3" from the header back into a 3.5" muffler. Full stainless tig welded. it's beautiful.

There are 2 transitions in the exhaust, from 2.5" to 3", and 3" to 3.5". I bought pre-made transitions from burns stainless, and they worked beautifully.

2.5" collector outlet -> transition -> 3" This is the most beautiful part of the exhaust. My stainless borla header with the ceramic coating I had applied is holding up quite well. The transition fit perfectly, and the welds are oh so clean!
http://www.darksci.net/~chunky/pistons/ex1.jpg

the first bend is also the lowest part of the exhaust. I may go back to have the shop try and raise it up a bit there if possible.
http://www.darksci.net/~chunky/pistons/ex2.jpg

nice and straight. . .
http://www.darksci.net/~chunky/pistons/ex3.jpg

yep, even the 3 bolt flanges are stainless.
http://www.darksci.net/~chunky/pistons/ex4.jpg

who needs a tip when you've got a 3.5" outlet from your muffler?
http://www.darksci.net/~chunky/pistons/ex5.jpg

it is LOUD. a few people at the meet can attest to that for sure. I will be buying a 2nd borla muffler to use as a resonator soon. I love the sound of it though, I just wish it had less drone. The borla sounds fucking rad at WOT. No buzzing, nice and smooth tone. When i'm cruising at 2500rpm, you can discern a rythmic 4 cylinder rumble from the exhaust drone. Once I get rid of the drone, i'll be so glad. I'll have it running as it is for the dyno @ mainstream most likely.

9bells
01-27-2005, 11:31 PM
Nice stuff. Must be a screamer. :thumbsup:

chunky
01-27-2005, 11:42 PM
Nice stuff. Must be a screamer. :thumbsup:

oh yeah. the exhaust is just plain foolishness. But, aside from all the vibration noise at certain load/rpm levels, there is no buzzing, which i'm really happy about. The borla muffler has a million mile warranty, so if it ever starts buzzing, that shit is getting sent in - but borla makes a quality product, and the muffler is from their xr-1 race lineup.

I'll try to get some WOT sound clips up sometime.

JTSmith
01-28-2005, 12:36 AM
Looks nice Razid.

Are you gonna go to Mainstream on the 6th?

9bells
01-28-2005, 12:43 AM
oh yeah. the exhaust is just plain foolishness. But, aside from all the vibration noise at certain load/rpm levels, there is no buzzing, which i'm really happy about. The borla muffler has a million mile warranty, so if it ever starts buzzing, that shit is getting sent in - but borla makes a quality product, and the muffler is from their xr-1 race lineup.

I'll try to get some WOT sound clips up sometime.

Race mufflers sound the best. Having no resonator helps with drone I found.

9bells
01-28-2005, 12:46 AM
Doesn't look like you are bearing on many threads through your 3-bolt flange
though. Looks like lock nuts, but not engaged enough to work. For safety, maybe grab longer bolts.
Just noticed.

chunky
01-28-2005, 12:51 AM
Looks nice Razid.

Are you gonna go to Mainstream on the 6th?

yep, i'll be there!

chunky
01-28-2005, 12:52 AM
Race mufflers sound the best. Having no resonator helps with drone I found.

man, it drones sooo bad with no resonator right now. . . I've got to get one if I'm going to keep this exhaust on daily. I've been advised by by both the installer and several friends that a resonator will take the drone out of the cabin w/o affecting performance too much.

I'll have fun with this while it lasts for sure, but a resonator is definitely in my future.

chunky
01-28-2005, 12:53 AM
Doesn't look like you are bearing on many threads through your 3-bolt flange
though. Looks like lock nuts, but not engaged enough to work. For safety, maybe grab longer bolts.
Just noticed.

thaks for the tip! i've yet to get under the car and really inspect the exhaust, i'll check the bolts then to make sure there's enough engagement.

BigDawg
01-28-2005, 06:56 AM
Doesn't look like you are bearing on many threads through your 3-bolt flange
though. Looks like lock nuts, but not engaged enough to work. For safety, maybe grab longer bolts.
Just noticed.

I saw that too.

I heard this exhaust last night... :nervous: Needless to say, I will hear Raz coming...when he leaves his house! :laughing:

It is pretty nice work though.

chunky
01-28-2005, 10:06 AM
I saw that too.

I heard this exhaust last night... :nervous: Needless to say, I will hear Raz coming...when he leaves his house! :laughing:

It is pretty nice work though.

i wish you could hear it at WOT in 3rd gear. it sounds sick, with no buzzing. . . :P

hopefully the resonator will take care of the drone. if not, i'll also be getting this:

http://store.summitracing.com/partdetail.asp?part=DTC%2D72%2D32510&N=120+4294923429+4294922711+305162

I hear those things work well for killing sound.

if you want me to take your exhaust up there for him to do, let me know. ;) i'll take it when I get my resonator put in and have the 3" cat flanged to fit my exhaust.

9bells
01-28-2005, 10:24 AM
man, it drones sooo bad with no resonator right now. . . I've got to get one if I'm going to keep this exhaust on daily. I've been advised by by both the installer and several friends that a resonator will take the drone out of the cabin w/o affecting performance too much.

I'll have fun with this while it lasts for sure, but a resonator is definitely in my future.

Could be size difference I guess. Just found that all the aftermarket cat-backs I have heard in local club, try too hard to rumble. I suspected it was the resonators after hearing mine without. Mufflers also have part in this though. Sucks to have to take it apart again, but being happy with it is what counts.

BigDawg
01-28-2005, 10:27 AM
BTW, there is a guy neamed john d on H-T that has 304 for the low. Go over there and tell him that Jarrod who just order some tubing told you about him.

chunky
01-28-2005, 11:18 AM
Could be size difference I guess. Just found that all the aftermarket cat-backs I have heard in local club, try too hard to rumble. I suspected it was the resonators after hearing mine without. Mufflers also have part in this though. Sucks to have to take it apart again, but being happy with it is what counts.

it's probably due to the larger cabin size of the ep3. more of the low freq. exhaust drones. also, the differences in the head could be an issue.

I have no cat btw, a catalytic would quiet it down a lot.

chunky
01-28-2005, 11:19 AM
BTW, there is a guy neamed john d on H-T that has 304 for the low. Go over there and tell him that Jarrod who just order some tubing told you about him.

word. can he get borla for cheap? I want that muffler/resonator I linked in the first post.

BigDawg
01-28-2005, 11:24 AM
word. can he get borla for cheap? I want that muffler/resonator I linked in the first post.

I don't know dude, hit him up. Like I sadi tell him I told you about him and he might still give the hook like he gave me.

chunky
01-28-2005, 09:05 PM
here's a short video clip of the exhaust at idle.

http://www.darksci.net/~chunky/videos/exhaust1.wmv

GIKEN
01-28-2005, 11:01 PM
Raz, I want to ride in your car before you get the resonator and/or that piece from summitracing. Mine drones bad and I want to know what difference yours will be before and after. I may have to get the same thing as you. I do know I have a resonator on mine already, but maybe that other piece will help with the drone. I'll take you for a ride in mine so you can hear mine drone.

chunky
01-29-2005, 01:05 AM
Raz, I want to ride in your car before you get the resonator and/or that piece from summitracing. Mine drones bad and I want to know what difference yours will be before and after. I may have to get the same thing as you. I do know I have a resonator on mine already, but maybe that other piece will help with the drone. I'll take you for a ride in mine so you can hear mine drone.

well, the resonator will be on soon. heh. the exhaust is gonna get me in trouble if I don't quiet it down soon.

I've already ordered the 2nd muffler from summit racing. did you know they match online pricing? got the 3" round muffler with 5" diameter casing for 117 shipped. it's a pretty good sized muffler and should work really well as a resonator. . . as long as it kills the horrid cabin resonance i have, i'll be cool. I can live w/o flooring it, so long as I can cruise in peace.

project02rsx
01-30-2005, 04:39 AM
damn..3" is a lil wide for non turbo...losin lotta back pressure...specially for a lil civic

RSX-Slow
01-30-2005, 10:13 AM
Isn't having no back pressure good? Having a stepped exhaust is the best way to go.

DallasTypeS
01-30-2005, 10:38 AM
damn..3" is a lil wide for non turbo...losin lotta back pressure...specially for a lil civicthat's b-series tech that has no bearing on the k-series.

GIKEN
01-30-2005, 10:44 AM
I love my 3" exhaust from header back. I felt the gains right when it was installed. There's a little hesitation when I roll into the throttle right at about 3k, but other than that, I like the performance of it. Just has this drone inside the cabin.

Diggs
01-30-2005, 11:08 AM
damn..3" is a lil wide for non turbo...losin lotta back pressure...specially for a lil civic


i love the backpressure myth it cracks me up everytime :rolleyes:

chrisnick
01-30-2005, 12:36 PM
i love the backpressure myth it cracks me up everytime :rolleyes:

yeah, its not about backpressure, but flow. 3" seems a little big, why'd you choose such a larger diameter piping?

Diggs
01-30-2005, 04:29 PM
that's b-series tech that has no bearing on the k-series.


exactly what he said.... these engines are completely different animals. there has been dyno testing that proves a 3 inch exhaust is needed with more than a "mild" application. its all based off of flow velocity and quality. also the k20a(2) head flows a lot higher than any b series head, even modified ported b series heads so with a good header a larger exhaust would be beneficial.

keebs23
01-30-2005, 05:07 PM
Just wondering about the exhaust diameter on K20A2's.

When you say "mild" you mean basic bolt-ons like I/H/E + hondata. And for that setup an exhaust from 2.36"-2.5" is suitable?

Or do IPS cams with these mods still fall under mild?

With cams, hondata, CAI, RH + catback will a 3" exhaust prove to have better power gains than a 2.5" exhaust?

Thanks

Diggs
01-30-2005, 05:58 PM
Just wondering about the exhaust diameter on K20A2's.

When you say "mild" you mean basic bolt-ons like I/H/E + hondata. And for that setup an exhaust from 2.36"-2.5" is suitable?

Or do IPS cams with these mods still fall under mild?

With cams, hondata, CAI, RH + catback will a 3" exhaust prove to have better power gains than a 2.5" exhaust?

Thanks

when you refer to cams what kind of cams are you refering too? also when i said mild i meant for a basic bolt on or flash customer. me personally wouldnt bother with a 3 inch exhaust system unless i upgrade farther than ITR cams. i dont know the positive or negative effects of a 3" exhaust on stock cams with bolt ons.

chunky
01-30-2005, 09:06 PM
I went to the dyno today to do some tuning. I'm still waiting for my dyno results to be emailed to me so I can't post them just yet.

here's pics of the dyno & exhaust.

the 2.5" -> 3" transition.
http://www.hondalife.com/~chunky/pistons/ex6.jpg

The exhaust has so few bends.
http://www.hondalife.com/~chunky/pistons/ex7.jpg

It's nearly straight as it goes over the rear sway bar.
http://www.hondalife.com/~chunky/pistons/ex8.jpg

A shot of my ceramic coated borla header. primaries are much longer than your average "shorty" header.
http://www.hondalife.com/~chunky/pistons/ex9.jpg

wideband o2 sensor bung.
http://www.hondalife.com/~chunky/pistons/ex10.jpg

This is the tightest spot on the exhaust. on the inside radius of that bend, it is basically touching the floorpan.
http://www.hondalife.com/~chunky/pistons/ex11.jpg

it drags a bit coming into the driveway at work. :(
http://www.hondalife.com/~chunky/pistons/ex12.jpg

It's not too bad though. good thing i'm not worried about keeping it pretty forever.
http://www.hondalife.com/~chunky/pistons/ex13.jpg

Yeah, you might say it hangs a bit low.
http://www.hondalife.com/~chunky/pistons/ex14.jpg

last but not least, a video of the car running on the dyno. :D

It sounds a bit off on the dyno, the mic pics out certain frequencies & highlights them. Either way, this is what a race trim exhaust will sound like on an ep3. The borla supposedly is one of the quietest race mufflers too. :P

http://www.hondalife.com/~chunky/vids/dyno_exhaust2.wmv

chunky
01-30-2005, 09:09 PM
yeah, its not about backpressure, but flow. 3" seems a little big, why'd you choose such a larger diameter piping?

smart man. The name of the game is optimizing flow velocities in the rpm range where you want to make power.

If you search, you can read up on my motor build thread. I'm going to toss the a3 in favor of an 11.9:1, 9000rpm a2 with ported head and other goodies before too long.

The exhaust probably is a bit oversized for the a3, but my dyno showed that I lost no midrange power, and significantly prolonged my high rpm powerband. I make peak power around 6500-6800, and it is maybe 2hp down at 7700rpm. Most ep3's hit a wall at 7300 and are 10hp off peak by the time they get to 7700.

I've planned out my basic boltons carefully. The borla header is the only compromise, but it does quite well at high rpm v.s. the shorties, just not quite as good as the true longtube headers. Eventually it will be tossed in favor of something that will better support my target powerband.

chunky
02-01-2005, 01:20 AM
Blue line is before tuning, red line is after only 1 hour tuning.

Who said 3" exhaust would kill all my low end torque? :P looks like I still have plenty. Note the high rpm falloff. it's a lost smoother and less drastic than most other i/h/e combos. Up top is where the bigger plumbing has paid off. With some more tuning, I could probably smooth things out in my midrange. The hump at about 5000rpm is where the intake manifold resonance & intake tube resonance co-incide (i designed the intake to be a specific length to achieve this). The 2nd resonance peak would be at about 8000rpm, but the cams don't make power that high so it's not really seen. That will show up on the built motor though.

My car feels great now. I'd like to run her at the track, but the clutch is ailing and the new motor will probably go in before I get to the strip.

http://www.darksci.net/~chunky/dyno1.jpg

chrisnick
02-01-2005, 09:19 AM
looks great down low and uptop! is there a dyno that you can overlay so we can see the differences between this and pre-exhaust/tuning?

chunky
02-01-2005, 10:47 AM
looks great down low and uptop! is there a dyno that you can overlay so we can see the differences between this and pre-exhaust/tuning?

my previous dyno's were all done on dynapacks. i made 146/115 on the last dyno prior to exhaust + kpro.

But you can't overlay dynapack onto dynojet. :(