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combatc87
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combatc87

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Jan 6, 12:25am - #366635 
Good exhaust for both N/A and F/I?

I'm looking for some extra sound and performance out of my car. I'm prepping my car for a turbo kit sometime late spring or early summer, but until then I want an exhaust, but I don't want one that will either adversely effect my turbo or crap out power until then. I know with turbo 3" piping is good, but that would suck on N/A, right? Would something like the Greddy Evo 2 or TPR suck with a turbo?


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Kim
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Jan 6, 12:35am - #366636 
uh yes and yes.

Basically with a turbo you don't want any back pressure so gases exit faster and the turbo spools faster. the greddy or tpr both have canisters that have a certain amount of back pressure for good torque and flow. for a turbo you want a straight pipe design that allow gases to exit quickly. best idea is to wait for the turbo, to fabricate an exhaust.


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combatc87
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Jan 6, 12:39am - #366637 
i figured i'd get that response. i really don't want to wait to get an exhaust. could i get one and then instead of fab a whole new system just get the "canister" removed to relieve back pressure? i'm not looking to put out insane numbers once i get the turbo, so i don't need an awesome set-up.


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Kim
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Jan 6, 12:46am - #366638 
i guess you could do that, the TRD exhaust comes in two peices, exhaust muffler(canister) and tail pipe (tube with a tip that connects to the canister)you can just have someone make another steel pipe to replace the canister and just have a "staight pipe" no muffler. it should work, but it'll be loud as hell.


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celicadragon
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Pittsburgh, PA
Jan 6, 7:44am - #366639 
well, my custom setup is a straight pipe with a performance muffler where the resonator used to be and it is a perfect sound, has a nice rumble but no weedwacker effect and definately no where near as loud as all the civics running around


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Zero
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Jan 6, 1:58pm - #366640 
how about just getting a universal exhaust muffler for right now, then get something else later?


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BlkCelicaGT07
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Jan 6, 2:09pm - #366641 
kazuma thumbsup

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celicadragon
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Jan 6, 2:20pm - #366642 
yeah mysetup cost me $120 with work and the muffler included not bad for a temp exhaust until i go turbo


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Lucky_317
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Jan 6, 3:44pm - #366643 
why would you waste the money??? you don't want a muffler unless it's a 3" inlet for the turbo. since you don't care about power and you know you're getting the turbo, get the 3" exhaust done now and sacrifice a lil power. it'll be more cost efficient down the road.


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combatc87
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Jan 6, 4:29pm - #366644 
when i said i don't care about power, what i meant was huge gains once i get the turbo from the exhaust.


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SLVCELI
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Jan 6, 5:04pm - #366645 
Originally Posted by Lucky_317
why would you waste the money??? you don't want a muffler unless it's a 3" inlet for the turbo. since you don't care about power and you know you're getting the turbo, get the 3" exhaust done now and sacrifice a lil power. it'll be more cost efficient down the road.


What he said. Just wait or get the 3" exhaust now.


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Jan 6, 5:11pm - #366646 
you need 3" for turbo.
N/A 2.5"


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Jan 6, 6:26pm - #366647 
3" piping and an APEXI universal 3" turbo muffler

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celicadragon
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Jan 7, 11:40am - #366648 
some muffler shop told my frien that wanted a custom exhaust on his 2004 elantra that 2.5 would ruin his engine due to the loss of backpressure and advised a 2.25 exhaust. something about a valve breaking. said he saw it happen on a neon, so 3' na might be bad


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Lucky_317
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Jan 7, 11:44am - #366649 
an elantra is not a celica and make sno power to begin with. it won't break anything.

Running a 3" on an N/A car shouldnt lose tooo much power. You'd have to be a fool to buy a turbo and then not care what gains you get. Why the hell would you get a turbo for in the first place???????????????????????????????????????????????????????????? confused confused you're better off doin it the way I said. that way you get the best of both worlds. thumbsup


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combatc87
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Jan 7, 12:33pm - #366650 
okay, i lied when i said that. what i meant was i want something powerful yet streetable and don't want to spend huge dollars to push a little extra out of the turbo.


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celicadragon
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Jan 7, 12:51pm - #366651 
well, what would happen if there was a lack in back pressurre?


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Lucky_317
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Jan 7, 1:36pm - #366652 
you'll maybe lose a lil hp but thats it. nothing major or even that noticeable if you're not takin it to the track.


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celicadragon
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Jan 7, 1:39pm - #366653 
so no backpresure will not cause any harm? can anyone say what a muffler shop guy thinks that making an exhaust too big could have adverse effects????


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drkramm
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Jan 7, 1:40pm - #366654 
jezus h chirst next person that talks about back pressure go lick a extesion cord it will give you 10 hp

only reason a 3 inch is useless on a na exhaust is because the engine doesn't put out that much exhaust to warrent that big of a pipe a 2.5 is plenty


last week on two guys garage formely shady tree mechanic they tested the exhaust of a ford range 4.0L v6 and guess what on the factory 2.5 inch exhaust there was less then 1 psi of pressure

only time "back pressure" is needed is in a 2 stoke application


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celicadragon
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Jan 7, 4:21pm - #366655 
what are some examples of a 2 stroke application? i am just trying to figure out why this guy wont do the elantra exhaust in 2.5 inch from 2.0 inch-he says he will do a 2.25 inch at most


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drkramm
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Jan 7, 8:36pm - #366656 
Originally Posted by celicadragon
what are some examples of a 2 stroke application? i am just trying to figure out why this guy wont do the elantra exhaust in 2.5 inch from 2.0 inch-he says he will do a 2.25 inch at most


a 2 stroke as in a dirt bike or those lil pocket bikes or any type of engine wher eyou have to mix oil in to the gas

2 stroke relies on the pressure and vacume of the exhaust in the expansion chamber (muffler) to suck in the new fuel and air and get out the old on a 4 stroke app like every car the exhaust is useless jsut a by product

the guy who said 2.5 is bad is prolly the same one that runs an electric turbo on his 3 cylinder metro


hey thats a 20 minute phone call
"if i have seen farther it is by standing on the shoulders of giants"
derek: do you know that non dairy cream is flamable
Jennie: ...derek..what did you do
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drkramm
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pa
Jan 7, 8:46pm - #366657 
"back pressure"
http://auto.howstuffworks.com/muffler5.htm
2 stoke expansion chamber
http://auto.howstuffworks.com/question636.htm

more about "back pressure" (more specificly scroll to the part where it says "are you a muff")
http://auto.howstuffworks.com/framed.htm...hausttheory.htm


hey thats a 20 minute phone call
"if i have seen farther it is by standing on the shoulders of giants"
derek: do you know that non dairy cream is flamable
Jennie: ...derek..what did you do
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Lucky_317
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Fontana, CA
Jan 7, 10:45pm - #366658 
for goodness sake, nothing will happen. that guy is full of shit. I have a 2002 civic ex auto with a 2.5" exhaust. been running since the car was right off the lot in 2002. NOTHING WILL HAPPEN.


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Johnsgt
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Southern California
Jan 8, 1:46am - #366659 
Personally with my turbo running low boost, there wasnt much difference between 2.5" and 3" power wise on the dyno. However there was a big difference with muffler and without. However if i was running more boost i think the 3" will make more of a difference.

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e_degala
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northeast
Jan 8, 3:14am - #366660 
trying to kill two birds with one stone...


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combatc87
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Jan 8, 11:07am - #366661 
^^exactly


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volcomrider6
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Jan 9, 5:12pm - #366662 
This forum is really uneducated. Backpressure is never a good thing. The thing you have to worry about w/ having a 3" exhaust on a n/a car is the loss of flow velocity. When the exhaust exits it needs to have a certain flow velocity to exit properly. Without it, the exhaust will scavenge and hang out in the exhaust cylinder and then it takes more work for the engine to push it back out. I know there is a formula or something to figure out proper fpi to create optimum performance. With a 3" exhaust, you'll lose some bottom end and make the engine work harder. There is an article on team-integra.net that covers this whole topic.


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