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Discussion Starter · #1 ·
My buddy is going to take his 96 accent up to a MIR sometime this spring and he wants to get the best time(1/4 mile) possible with the least amount of money. We were wondering if it is even possible to run open headers on a pretty much stock hyundai accent, and if so, what are the procedures for doing so.


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Anything is possible, but removing the exhaust might actually make it go slower because 4 cylinder cars require the back pressure from the exhaust pipe to run good <img src=/images/forums/snitz/thumbup.gif width=25 height=18 border=0>


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As in disconnect from the exhaust from the header?<img src=/images/forums/snitz/uhh.gif width=15 height=15 border=0>

If so you will lose back preasure greatly which will mean huge loss in torque which will result in a poor 1/4 mile time.


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Ghey....

Not only will you loose TONS of back pressure without a header connectecd to a downpipe, you will burn TONS of gas because your not connected to a 02 sensor anymore, Trust me I did it just to see how loud and annoying I could be for a week, but sucked tons of gas and was slow going it.


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NEED backpressure?? <img src=/images/forums/snitz/moon.gif width=15 height=15 border=0> Needs the ECU recalibtated more like. If you reduce backpressure in the exhaust you'll make the motor run lean. To get around this, you need to increase the fuel supply. On old-school vehicles you'd fit larger jets in the carburetor. On anything with electronic fuel injection, you need to get the fuel map recalibrated to keep the injectors open longer, getting more fuel in.

Without recalibration, the car will run like crap. But if you want to try an open pipe, disconnect the catalytic convertor from the downpipe, leaving the CO2 sensor in place. This should give the engine some idea of the conditions it's running under, and increase fuelling to suit.


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I am surprised some people in here had the nerve to answer your question. But then again, most of the people on this site are good people, and don't let stuff like this bother them. Why don't you change your forum name, and come back a more mature person, and not tell us and then ask questions. Thats the beauty of the internet! A forum name like that just plain ignorant!

Immature little prick. When the hell are you people going to learn? ooooo...."Me so cool because me drive a Honda or subaru", or whatever you said you had"

Get a life.

Guys, I'm done. No need to turn this into a flame or move it. I just don't like ignornat screen names such as his.

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Edited by - jrh382 on 02/14/2002 1:22:39 PM
 

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Damn, JRH, He was just asking a simple question.


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I know Lantra, but just the ignorance of not only his forum name but the lame posts he did awhile dissing Hyundais was just stupid. And for what reason?


<hr width=60% noshade size=1 align=left>2000 Hyundai Elantra GLS
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I do agree with jrh on this one. This kid is a little imature fvcktard who comes in here does nothing but start sh!t and now he wants his questions answered. The funny thing is that by asking a entry level tuner question like this he proves he doesn't know sh!t about cars.

Oh well I will still answer the little fvckers questions but I do agree that maybe he should change his name.


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<BLOCKQUOTE id=quote>quote:<hr height=1 noshade id=quote>
NEED backpressure?? <img src=/images/forums/snitz/moon.gif width=15 height=15 border=0> Needs the ECU recalibtated more like. If you reduce backpressure in the exhaust you'll make the motor run lean. To get around this, you need to increase the fuel supply. On old-school vehicles you'd fit larger jets in the carburetor. On anything with electronic fuel injection, you need to get the fuel map recalibrated to keep the injectors open longer, getting more fuel in.

Without recalibration, the car will run like crap. But if you want to try an open pipe, disconnect the catalytic convertor from the downpipe, leaving the CO2 sensor in place. This should give the engine some idea of the conditions it's running under, and increase fuelling to suit.


<hr width=60% noshade size=1 align=left>
<hr height=1 noshade id=quote></BLOCKQUOTE id=quote>
true about running lean, and the carburator jets, and the remapping, but the FACT remains that tiny engines like ours NEED the backpressure to create TORQUE... *maybe* the HP gain would be nice, but if you can't get up to that peak HP soon (which torque enables you to do) then u won't have even close to good 1/4 mile times!!!!!!!! <img src=/images/forums/snitz/cool.gif width=15 height=15 border=0>


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No, backpressure is always bad, no matter the displacement.

With a bigger pipe than necessary, the exhaust cools down and hence moves slower. The hot exhaust coming out of the engine runs into the slower moving exhaust and pressure builds.

With a proper pipe size, there is enough room for the volume of exhaust to escape, but not so much that it cools down a lot and causes backpressure.<img src=/images/forums/snitz/thumbup.gif width=25 height=18 border=0>


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Back pressure? I thought that was a bad thing. Isn't what we want is low back pressure, and high intake/exhaust velocities @all rpms? Anyways I've run my '96 Accent with the exhaust manifold, primary cat, and downpipe. Very loud. Didn't seem to help. Think it was slower in the lower rpms too.

Frisco


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lol frisco if you run that slow, that should answer your back pressure question <img src=/images/forums/snitz/wink.gif width=15 height=15 border=0> you don't want back pressure if your car is heavily boosted. if you runnning a n/a setup then you want back pressure.


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<BLOCKQUOTE id=quote>quote:<hr height=1 noshade id=quote>I've run my '96 Accent with the exhaust manifold, primary cat, and downpipe. Very loud. Didn't seem to help. Think it was slower in the lower rpms too.<hr height=1 noshade id=quote></BLOCKQUOTE id=quote>

Exactly<img src=/images/forums/snitz/thumbup.gif width=25 height=18 border=0>

Back pressure in small engine cars is need to produce torque. Torque is what gets you up the speed you want to be at quickly.


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Discussion Starter · #15 ·
thank you the people that actually responded on topic, but for the rest of you who continue to say im not knowledgeable about cars TO HELL WITH YOU ALL. I know subarus and subarus only so stop bitchin that your hyundais are slow.


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<img src=/images/forums/snitz/cry.gif width=16 height=16 border=0>
then your obviosly not an "expert" if you only know suburus
COCK!<img src=/images/forums/snitz/thumbup.gif width=25 height=18 border=0>


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how large was the downpipe in diameter frisco?

Low, low pressure with a high exhaust stream velocity is good is good.

No backpressure is bad, but a lot is worse.


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i have an important old school thing to say

old school, the 68 couger you were tuning, wasn't a 4 cylinder either ;-)

hehe ummm... 4 cylinder's are definetely different then larger displacement engines...

but would retuning the 4 cylinder to add more effect, would it still lose torque??




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<BLOCKQUOTE id=quote>quote:<hr height=1 noshade id=quote>lol frisco if you run that slow<hr height=1 noshade id=quote></BLOCKQUOTE id=quote>

Rudy/AUTOBOT,

Well honestly I can't tell you if my car was really slower or faster from running that setup. There wasn't a substantial change. It's just like installing an intake, you can't/barely notice the improvement, just noise. It was a quick run/butt dyno, since I was more worried about getting caught running my car without the secondary cat and exhaust. A whole lot of vibrating though. Quite the juvenile back then, keke.

My exhaust system is already free flowing, hardly any back pressure. Straight through muffler but without the raised louvers (louvers pressed in towards the exhaust stream) like you see inside those cherry bomb mufflers, and no exhaust resonators. Maybe that's why there was no significant change when I removed the exhaust.

Skierd,

2 inches.

<BLOCKQUOTE id=quote>quote:<hr height=1 noshade id=quote>...a good way for an engine to lose power is through back pressure.<hr height=1 noshade id=quote></BLOCKQUOTE id=quote>
Read about it: http://www.howstuffworks.com/question172.htm That article mentions V-8s and I-4s. I've also read this in other sources. A lot of the sources all seem to say back pressure is an old wive's tale. They all seem to focus on the importance of velocity instead. You can also glean a lot of usefel general exhaust information, some relating to back pressure here: http://www.se-r.net/car_info/engine_performance_tuning.html The cars mentioned there are normally aspirtated.

Frisco


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<BLOCKQUOTE id=quote>quote:<hr height=1 noshade id=quote>
<BLOCKQUOTE id=quote>quote:<hr height=1 noshade id=quote>I've run my '96 Accent with the exhaust manifold, primary cat, and downpipe. Very loud. Didn't seem to help. Think it was slower in the lower rpms too.<hr height=1 noshade id=quote></BLOCKQUOTE id=quote>

Exactly<img src=/images/forums/snitz/thumbup.gif width=25 height=18 border=0>

Back pressure in small engine cars is need to produce torque. Torque is what gets you up the speed you want to be at quickly.


<hr width=60% noshade size=1 align=left><font color="red" size="4">Hyu</font><font color="orange" size="4">ndai</font><font color="yellow" size="4">Tun</font><font color="green" size="4">er =</font><font color="blue" size="4"> t3h</font><font color="purple" size="4"> ghey</font>
<hr height=1 noshade id=quote></BLOCKQUOTE id=quote>
isn't that what I said??????????/ <img src=/images/forums/snitz/smile.gif width=15 height=15 border=0>


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