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need idea with building custom exhaust

 
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Old 05-17-2010, 08:52 PM
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need idea with building custom exhaust

hey guys im trying to build my own exhaust cuz currently i just have some no name pipe on my car. it sounds pretty decent but i really want dual exhaust, i know i rice or what ev so dnt even start its what i like. so im thinking of gettin s megan header and just use 3 inch straigth pipe all the way back to rear axle where ill put in a y and slpit it into 2 megan exhaust pipes

Megan GT muffler Exhaust 2.5 Prelude 92 93 94 95 96 H22: eBay Motors (item 320532155803 end time Jun-12-10 11:00:22 PDT)

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ive reaserched around and seen some people on opposite sides of the header sayin its no better than stock. im really wantin to gain some performance and still have a decent sound, no fart can or anything.

does anyone have any ideas how i can make this work keep in mind i do want 2 duals, and i will be using the megan exhausts, jst need to know if the header is worth the money? should i use 3 inch piping or what size whould be best i have a 95 h23 if that helps. and also should i run with cat or no cat or should i get a hi flo if so what kind. thank you all in advance and no flaming or anything jst leave if u have nothing good 2 say this is a serious question and i want a real answer
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Old 05-17-2010, 09:40 PM
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Re: need idea with building custom exhaust

Hey, say what are your plans for the Lude (street, drag, track etc, and what modifications so far)? Not too sure how the H23 responds to an 3' exhaust but it should be similar to the H22A. You will sacrifice low end and gain top end. You will also gain a whole heap of noise if you remove the CAT and go 3' the whole way back!

When I removed/gutted my CAT I noticed a fair few changes. Instead of the proclaimed increase in top end power i lost power!. But then my H22A is a very strange engine, factory fuel pressure makes it run lean (air fuel ratio of 14.5:1 from 4.7k rpm till 5.5k rpm). Thus, I run higher fuel pressures (around 42psi without vacuum) and this changes everything for my engine (JDM by the way). I had the fuel pressure set according to the dyno, then removed the CAT a few months later..., engine response definitely fell and I was running lean again after this. Increased fuel pressure to around 44psi and all went well again. Therefore in my case the CAT was a huge restriction, haven't gone back to the dyno to check changes yet....

My exhaust tune also became much louder, almost too loud! Therefore I would recommend getting a high flow CAT, and if you go 3' I would recommend fitting at least 2 resonators otherwise it will be pitchy and loud!

As for the Megan header....

Quote from Honda-tech, Click ME:

"DC Sports 4-2-1
Greddy 4-2-1
Megan Racing 4-2-1
OBX Racing 4-2-1
Pacesetter 4-2-1
These are the CARB legal headers. These headers make little WHP over stock, if any. I don’t see why anyone would want to waste their money on it. If you plan to get a CARB legal header, stick w/ the OBX Racing one, because you can get it for under $200 on eBay. All the headers feature a small 2.0” collector that restricts exhaust flow. A popular thing to do is to get one of these headers, and modify the collector. This is done by cutting off collector at the end of the header, and welding a 2.25” or 2.5” pipe to it."

....its up to you. Some get gains others don't. The collector mod is the way to roll on these but other than that the low end headers probably wont gain you much.
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Old 05-17-2010, 10:07 PM
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Re: need idea with building custom exhaust

youre really most likey to lose horsepower, considering our cars were designed for a single exhaust
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Old 05-17-2010, 10:55 PM
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Re: need idea with building custom exhaust

i believe if you use maybe a smaller piping size then it would balance the dual exhausts as if it were a single, thus still keeping the same exhaust pressure. but thats just my guess... but a 3 inch dual exhaust is kind of overkill, possibly very loud, and you wont get the nice sport sound. Ive sat in a car with 1 single 3 inch exhaust and it was loud inside the vehicle, and it gave me headaches
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Old 05-17-2010, 11:30 PM
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Re: need idea with building custom exhaust

What a lot of people don't realize when having plans to go dual-outs, is that there's only space for one pipe from the engine to the back of the car, so it's not a true dual exhaust. As with a V-6 or V-8, you won't have the left and right exhaust channels mixing to create that flow, you'll just have the same channel splitting off at the end which will just replicate your exhaust tone on both side, but ultimately will have no effect on your power if you were to keep the stock diameter piping all the way back.

One thing I have seen a few times, on a Mini, a Mazdaspeed3, and something else, I can't remember..They had 4-2 headers that kept the 1/4 and 2/3 channels separate up to an X-pipe and dualed out from there. What effect that has out power output or flow efficiency, I'm not sure (I asked, the owners didn't know), but I'd like to know..
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Old 05-17-2010, 11:31 PM
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Re: need idea with building custom exhaust

Correct azn13; smaller diameter will keep the pressure (and gas velocity) where it needs to be with a twin muffler setup.

On a H23 the Megan header isn't bad, but the collector mod (as described above) is a good fix. It's a cheap part, so the gains will be minimal anyway. If you get a proper mandrel bent header made (or find one from a reputable manufacturer) you'll be way better off, though it will cost more $$$. What's that saying...you gotta pay to play.

For the cat, back to back testing carried out in a local workshop showed a massive gain when the cat was removed - 0.5whp. If you seriously feel that you need to do something with the cat then get a high flow, other than that just a replacement stocker will do the job.
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Old 05-17-2010, 11:46 PM
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Re: need idea with building custom exhaust

Well the megan header is 175 on ebay also bt I dnt need any carb stuff wich is y I can pretty much run straigth pipe as for the car its a dd and prob some drag time 2 time so I migth want it 2 where my ears aren't ringin lol by the way sorry for punctuation im typin from my phone as for the 3 inch piping I dnt have 2 have it I jst thougth I would c gains cuz I hear a lot of people sayin its good on h22s and they're pretty much the same thing exept for higher revin and vtec
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Old 05-18-2010, 12:06 AM
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Re: need idea with building custom exhaust

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Not too sure how the H23 responds to an 3' exhaust but it should be similar to the H22A. You will sacrifice low end and gain top end.
Just a clarification on this... When all the testing was done (the articles are on H-T if you want to see them), the H22's actually made more power and torque over the entire graph. Nothing was lost anywhere. Not sure if it would be the same on the H23 though. Someone should find out.
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Old 05-18-2010, 12:12 AM
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Re: need idea with building custom exhaust

Yeah it seems the h23 has no support really and I wanted the megan header cuz I thougth I would have it match the exhaust and also I have megan front and rear strut tower bars also all the megan stuff is real cheap and its been pretty good with all the stuff I've gotten from them I also got rear toe control arms and they're great so I really like the performance for the price
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Old 05-18-2010, 12:14 AM
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Re: need idea with building custom exhaust

I've had the Megan header for about two years and I don't like it at all. If you actually want an improvement in performance, you should step up to something along the lines of a HyTech Replica. It's pretty good and it seems to be relatively easy to get ahold of compared to the other high-end headers.
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Old 05-18-2010, 12:49 AM
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Re: need idea with building custom exhaust

well i friend had megan headers....and they cracked, i thought myself about gettig megan but all i did was get your normal headers no name brand and pretty much gave a straight pipe to the back i went 2.5 alot people say big motor big equipment.. not me...only go that big if your planning on something even bigger (turbo maybe)..i went with a CAT cause in my state u wont pass inspection and CEL might come on...im not good with the duals but u had someone earlier help u out with that... but im happy with my sound...and i gained a tiny bit more...vtec feel stronger and i actually feel a pull when it opens...just throwin this out there
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Old 05-18-2010, 02:52 AM
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Re: need idea with building custom exhaust

I have a twin muffler setup and it works like a charm, but bear in mind i have the f20a3 engine and not the h23 :/
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Old 05-18-2010, 04:46 PM
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Re: need idea with building custom exhaust

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Originally Posted by dbd6604 View Post
Just a clarification on this... When all the testing was done (the articles are on H-T if you want to see them), the H22's actually made more power and torque over the entire graph. Nothing was lost anywhere. Not sure if it would be the same on the H23 though. Someone should find out.

Dyno's rarely are able to give accurate power curves from 1-3k rpm, which is where your losses will be (less scavenging in a larger exhaust till rpm climbs). You would be able to feel it on the road at least. 3k is practically midrange so yes from 3k-7.6k or higher rpm there will be gains. I believe this is the thread you were talking about?

And it would be interesting to see if the H23A can make use of an 3' exhaust (hint hint, someone try it.lol).

And by duel exhaust I figured the OP was talking about two outlets/rear mufflers not two duel 3' exhausts from header back etc, or at least that's how I understood it. (Quote "but i really want dual exhaust, i know i rice or what ev"). Can split it around where the fuel tank is, not sure how that will sound with a 3' feed but I guess it's worth a go if you want two outlets.
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Old 05-18-2010, 04:48 PM
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Re: need idea with building custom exhaust

Well I'll put in another input on my setup that im going with, I'm currently on a raffle for a tri-y header on PP, getting a high flow cat, I got the Kteller mandrel bent piping 2.5 inch and I've ordered an OBX twin loop ( heard some goods and bads so I'd like to gamble with it, and if its bad I'll try another muffler). I'm going with this set up because I want to make power with a semi affordable cost plus I don't like loud obnoxious sounds coming from behind and the popo chasing after me lol. All in all it looks to be around $800 set-up if i lose the raffle, if I win looking at 600. basically custom enough for me. Now you could scrap the dual exhaust and go with a similar set up as mine or I'd recommend a mandrel bent piper to be involved into this..
It's your vehicle and I have most respect if you want to go dual, but you know a-holes out there might talk crap especially if there is no gains and just noise. I would love to see a nice dual set up but there might be trial and errors on how big and small the piping would be. Like you would have a straight pipe going to the back either 3inch for example then split off into 2 more 3 inch muffler inlets? I believe that's just too much exhaust flow like 3 inch to a 6 inch pipe.. so you gotta get the exhaust pressure to be correct without sacrificing power and not creating a bottleneck effect.
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Old 05-18-2010, 06:30 PM
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Re: need idea with building custom exhaust

yeah i think ima jst get a 2.5 all the way back 2 real axle and slplit it at the gs tank (by the way that is how i explained i wanted it) as for the dyno i would take the time to do it bt i dnt know of any dynos or honda tuners in my area i live in grand junction CO its all rednecks with 4in diesel exhausts out here

as for the car thing i really dnt care what people say work is work and i respect people 4 that if u actually take the time and plan sumthing out and try i think u atleast deserve some credit
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Old 05-18-2010, 08:57 PM
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Re: need idea with building custom exhaust

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You would be able to feel it on the road at least. 3k is practically midrange so yes from 3k-7.6k or higher rpm there will be gains. I believe this is the thread you were talking about?
Yeah that's the one. But I imagine that with a good anti-reversion header (HyTech, etc.), it would help scavenging tremendously and probably make up for most of, if not negate the loss on the low end.
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