pros & cons of a true dual exhaust?
i will be putting on a dual setup on my 88GTU and was wondering from the guys that have experience with this kind of setup, what are the pro's and cons of the duals. i will be using RacingBeat headers w/straight piping and stock mufflers for now since i've spent too much on taxes and whatnot. I will be getting the other stuff like presilencer/s and RB mufflers when i save up enough money for it later on this year.
edit: i forgot to mention that i also have another setup i got from a junkyard that has the y-pipe and a presilencer. advice on which i should stay with. go for the duals or get a flange put on the dual headers and use the presilencer w/the y-pipe? |
Price and weight.
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well, if i get the piping done around my house from teh same place that did my straight piping before it'll be like $60
if i go with the stuff from racingbeat, its gonna be like around $600 |
Originally Posted by koukifc3s
Price and weight.
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nm, i didn't realize it was a true dual setup. ;)
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wow its a good thing u guys pointed that out to me, that hadn't crossed my mind, i don't mind the noise, i have straight piping right now with the stock headers and it doesn't bother me, my friend has headers w/straight piping on his vert and its about teh same as the sound of my car
oh yea i forgot to mention that i took off emmissions and eliminated the 5th & 6th port cylinders so backpressure isn't an issue for me |
true duals i have heard flow a bit too much for an n/a, too much flow actually decreases power from the engine. think of exhaust like tuning the fuel, if you have too much flow then power will decrease, if you have too little flow power will also decrease. only a BP and a PP can handle the flow of a true dual setup unless you use smaller diameter piping.
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Originally Posted by ]v[akaveli
wow its a good thing u guys pointed that out to me, that hadn't crossed my mind, i don't mind the noise, i have straight piping right now with the stock headers and it doesn't bother me, my friend has headers w/straight piping on his vert and its about teh same as the sound of my car
oh yea i forgot to mention that i took off emmissions and eliminated the 5th & 6th port cylinders so backpressure isn't an issue for me Get the road race header from racing beat with the dual outlets, take whatever mufflers you want, and have an exhaust shop weld piping straight from the header to the mufflers. True duals and only 2 mufflers, no presilencers. It WILL be loud as shit, though. Just fyi. |
haha, u simplified what i was trying to say,
that's exactly what i'm gonna get done dual headers --> straight dual piping --> mufflers |
and i thought my T2 was loud, i can't imagine what an n/a would sound like! lol
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Originally Posted by Karack
and i thought my T2 was loud, i can't imagine what an n/a would sound like! lol
Needless to say I couldn't handle how loud it was and I put in a borla xr-1 midpipe to quiet it down :) |
Originally Posted by Karack
true duals i have heard flow a bit too much for an n/a, too much flow actually decreases power from the engine. think of exhaust like tuning the fuel, if you have too much flow then power will decrease, if you have too little flow power will also decrease. only a BP and a PP can handle the flow of a true dual setup unless you use smaller diameter piping.
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i simply made it a point so that the poster knows that a smaller diameter pipe is necessary for true duals. ;)
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what size in diameter would u guys recommend?
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Originally Posted by ]v[akaveli
what size in diameter would u guys recommend?
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I'm currently using 2.25" for my true dual piping.. current setup is as fallows..
RB road race headers>2 22" maganflow presilncers>RB rear mufflers. Piping is custom, and welded up by me.. bents are mandrel.. Power band seems is 4500-7800.. Pulls nicely till about 8200 but power seems to peak right around 7800.. stock port S5 enegine. There is a definet differnece over stock.. The only cons I could think is price.. You might add 15 more lbs with the extra persilncer and piping.. but the wider powerband is diffently worth it.. If your going strait pipe.. not going to much of a weight differnce. I would diffently go with true duals. I been in a few cars with collected system.. power diffently doesn't seem to match to mine.. and seems to fall flat on its face by 7k. |
Originally Posted by trainwreck517
I'm currently using 2.25" for my true dual piping.. current setup is as fallows..
RB road race headers>2 22" maganflow presilncers>RB rear mufflers. Piping is custom, and welded up by me.. bents are mandrel.. Power band seems is 4500-7800.. Pulls nicely till about 8200 but power seems to peak right around 7800.. stock port S5 enegine. There is a definet differnece over stock.. The only cons I could think is price.. You might add 15 more lbs with the extra persilncer and piping.. but the wider powerband is diffently worth it.. If your going strait pipe.. not going to much of a weight differnce. I would diffently go with true duals. I been in a few cars with collected system.. power diffently doesn't seem to match to mine.. and seems to fall flat on its face by 7k. that's exctly what kind of feedback i was looking for. seems u have the same setup i'm shooting for. i can't wait to finish with my car soon, i miss that biatch ;) |
Great...That's exactly what I'm planing to do. I already have the RB road race hdr, flanges, gaskets and a couple of fart cans, all I need to get is the magnaflow as a pre-silencer but my question is. Can I still open my ports if I attached the back pressure tube in to the new piping since she's an '86 na?
Any advise will be greatly apreciated. |
Great... That's exactly what I'm planning to do, I already have the RB road race hdr, flanges, gaskets and a couple of fart cans all I need is the magnaflow but my question is. Can I still open my ports if I attach the backpressure tube in to the new pipping? since she's an '86.
Any advise will be greatly apreciated. |
Has anyone thought about using single-baffle tractor mufflers as presilencers? They're light, dirt cheap, and tractors are run at WOT most of the time, so I don't think heat and reliabillity would be an issue. Any thoughts?
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i was going to get a collected header for my n/a but after reading this im not too sure .... ( i have an 87 streetported na)
i want to get the road race header , but i dont want to pay 225 for their presilencer and all that... how much would i be looking to spend to get the road race header ( 200 bux), and get all the other components elsewhere ( presilencer, mufflers, etc) i would get the collector, but if i can make power above 7k with this system , and wont make it with collected, then why get collected ? ... other plans for me may be getting the s5 intake conversion with vdi , and safc |
^ VDI conversion is nice, well worth the effort.
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http://www.exhaustproslinc.com/4rore.html
Thats what I used for presilncers.. then been holding up for over a year now.. including a few track days. Edit: Heres a few vids that show sound and what not.. last one shows some fire balls. http://www.mirror.wreckedyouth.com/v...unwinmedia.wmv 21.1MB http://www.mirror.wreckedyouth.com/v...ndowsmedia.wmv 34.7MB |
Originally Posted by trainwreck517
I'm currently using 2.25" for my true dual piping.. current setup is as fallows..
RB road race headers>2 22" maganflow presilncers>RB rear mufflers. Piping is custom, and welded up by me.. bents are mandrel.. Power band seems is 4500-7800.. Pulls nicely till about 8200 but power seems to peak right around 7800.. stock port S5 enegine. There is a definet differnece over stock.. The only cons I could think is price.. You might add 15 more lbs with the extra persilncer and piping.. but the wider powerband is diffently worth it.. If your going strait pipe.. not going to much of a weight differnce. I would diffently go with true duals. I been in a few cars with collected system.. power diffently doesn't seem to match to mine.. and seems to fall flat on its face by 7k. |
Well its a N/a.. which is why we use headers.. as for 4 port question it has been my understand 6 port side plates will work better because it will provide nice lowend, if your 5&6th ports are working right... so unless its a big port job and will be track driven I don't see why one would go 4 port on an N/A.
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heh .... did u film that video in city of commerce? i recognize that spot somewhat. i sure would like to listen to what your car sounds like 1 of these days in person to get an idea of the sound levels.
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taped the day one in Palos Verdes and the night one in a bussiness section in carson. I'll most likely take it to the meet in ricky and ronnies next month.
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true duals make your car sound like a freakin lawnmower
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thanx trainwreck guess im not going for the 4 port for a while
Originally Posted by trainwreck517
I'm currently using 2.25" for my true dual piping.. current setup is as fallows..
RB road race headers>2 22" maganflow presilncers>RB rear mufflers. Piping is custom, and welded up by me.. bents are mandrel.. Power band seems is 4500-7800.. Pulls nicely till about 8200 but power seems to peak right around 7800.. stock port S5 enegine. There is a definet differnece over stock.. The only cons I could think is price.. You might add 15 more lbs with the extra persilncer and piping.. but the wider powerband is diffently worth it.. If your going strait pipe.. not going to much of a weight differnce. I would diffently go with true duals. I been in a few cars with collected system.. power diffently doesn't seem to match to mine.. and seems to fall flat on its face by 7k. |
Its been said before(last week and the week before, etc......) that the only way to see which exhaust setup will work for "your" engine is to test the three basic types on a chassis dyno. Short primary, Long primary and true dual. Just remember what works good on one persons car might not be right for you.
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I dont see why you would need back pressure on a rotary? The only reason you need it on pistons is to hold the gas mix when both the valves are open so that it doesn't wash into the exhaust. Rotay's dont have this problem as far as I can see. Am I wrong?
I was running with just the header and a pipe directing the fumes down, and there was a noticable increase in power over having the rest of the exhaust hooked up; but the noise was off the wall, never doing that again...well, maybe once more. |
okay but y would you do a mod without doing research on it before then do your tests with your engine, im just asking for results with the true dual setup on a n/a
Originally Posted by MPM
Its been said before(last week and the week before, etc......) that the only way to see which exhaust setup will work for "your" engine is to test the three basic types on a chassis dyno. Short primary, Long primary and true dual. Just remember what works good on one persons car might not be right for you.
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Originally Posted by 1300ccTuner
thanx trainwreck guess im not going for the 4 port for a while
is this n/a or turbo, if its n/a what kinda intake should i use for this exaust I made my own custom cold are intake.. 92 interaga piping off ebay with a nice K&N filter. pics could be found here http://wreckedyouth.com/modules.php?...view_album.php Also did the TB mod.. which gave a bit more juice right around 2000-4000 and a slightly stronger peak. |
I was wanting a true dual setup for a while, but instead I've opted for the following: 2.5" header, straight pipe (replacement for the cat pipe) between header and stock Y-Pipe (2.5" stepped down to whatever diameter the Y-Pipe inlet is) straight back into straight through mufflers. As of now, I have everything but the midpipe. As a side question, what is the Y-Pipe inlet diameter on an S5 N/A?
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