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exauhst question #222667 Jul 13, 7:21am Jul 13, 7:21am
Joined: Mar 2004
Posts: 647
san bernardino, california
hector OP
Senior Member
2001 Toyota Celica GT
hector OP
Senior Member
2001 Toyota Celica GT

Joined: Mar 2004
Posts: 647
san bernardino, california
exauhst question
so heres a question that i hope someone can answer. i have heard that adding dual exauhst to a celica drops backpressure and although improving appearance(subject to opinion) lowers hp instead of giving gains.This makes sense and i agree with this idea. But i have also heard that just taking your muffler off gives the same gains as having a Performance muffler. To me taking the muffler off would cause there to be even less backpressure than if you had two mufflers working. So assumning that taking your exauhst off gives gains, why would putting duals on lower hp. Maybe i just dont know how a muffler works and i am being ignorant, but thats why i am asking the question. what do you guys think

Re: exauhst question [Re: hector] #222668 Jul 13, 8:01am Jul 13, 8:01am
Joined: Sep 2003
Posts: 825
Ft. Lauderdale, FL
hkysk8r86
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2000 Toyota Celica GT
hkysk8r86
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idunno

Re: exauhst question [Re: hkysk8r86] #222669 Jul 13, 8:09am Jul 13, 8:09am
Joined: Mar 2004
Posts: 647
san bernardino, california
hector OP
Senior Member
2001 Toyota Celica GT
hector OP
Senior Member
2001 Toyota Celica GT

Joined: Mar 2004
Posts: 647
san bernardino, california
spineyes spineyes spineyes spineyes spineyes
thats what i thought most people would think...for example kazuma...thats just a straight though pipe pretty much. no back pressure there. i think there has to be an ideal amount of pressure in the exauhst system and thats what gives the gains. but im still waiting for someone to give a long explanation as to how the exauhst system is optimized grin

Re: exauhst question [Re: hector] #222670 Jul 13, 8:10am Jul 13, 8:10am
Joined: Sep 2003
Posts: 825
Ft. Lauderdale, FL
hkysk8r86
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2000 Toyota Celica GT
hkysk8r86
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Joined: Sep 2003
Posts: 825
Ft. Lauderdale, FL
Wait for the Forum Troll Veterans to wake up thumbsup

Re: exauhst question [Re: hkysk8r86] #222671 Jul 13, 8:10am Jul 13, 8:10am
Joined: Jul 2003
Posts: 500
Salisbury, MD
2002 Spectra Blue Mica Toyota Celica GTS
GTSHYPR
Bruce Leroy
2002 Toyota Celica GTS
GTSHYPR
2002 Spectra Blue Mica Toyota Celica GTS
Bruce Leroy
2002 Toyota Celica GTS

Joined: Jul 2003
Posts: 500
Salisbury, MD
I've also heard that duals reduce back pressure and hp.
I've never heard that removing your exhaust will give you any Performance. I'm pretty sure that it will reduce your back pressure also. thumbsdown


I'm gonna take your little Civic. Dust it off. Turn it sideways and stick it straight up you candy A*s.
Re: exauhst question [Re: GTSHYPR] #222672 Jul 13, 8:29am Jul 13, 8:29am
Joined: Jun 2004
Posts: 118
Irvine, California
gearSHIFTx
Member
1990 Toyota Celica
gearSHIFTx
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1990 Toyota Celica

Joined: Jun 2004
Posts: 118
Irvine, California
Putting dual exhaust on a car that has 4 Cyl's isnt going to do anything besides sound and maybe a little gain. Because its not real "dual" exhaust. Dual exhaust is when there are 2 headers, and 2 different pipes completely seperate from each other ie. v6, v8. I would recommend just getting a normal cat-back exhaust.

Re: exauhst question [Re: gearSHIFTx] #222673 Jul 13, 8:39am Jul 13, 8:39am
Joined: Mar 2004
Posts: 647
san bernardino, california
hector OP
Senior Member
2001 Toyota Celica GT
hector OP
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2001 Toyota Celica GT

Joined: Mar 2004
Posts: 647
san bernardino, california
i know, i am going to do it just for looks, its not going to do anything for sure i know. thats why i am going to just use on muffler and run two pipes out of it and run then back into my cutouts. i know this way its pretty much the same thing as having one muffler and leaving everything normal. but some people actually have two mufflers, maybe its a cali thing, ive seen two celicas w/ duals and i know its not true duals but it still looks nice. and as for people with no muffler and reported gains there is lucky for one. and im sure hes not the only one.and one person w/ duals would be morris.

Re: exauhst question [Re: hector] #222674 Jul 13, 8:41am Jul 13, 8:41am
Joined: Jun 2004
Posts: 118
Irvine, California
gearSHIFTx
Member
1990 Toyota Celica
gearSHIFTx
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1990 Toyota Celica

Joined: Jun 2004
Posts: 118
Irvine, California
Well if you like the dual exhaust look, go for it thumbsup

Re: exauhst question [Re: gearSHIFTx] #222675 Jul 13, 9:21am Jul 13, 9:21am
Joined: Mar 2004
Posts: 647
san bernardino, california
hector OP
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2001 Toyota Celica GT
hector OP
Senior Member
2001 Toyota Celica GT

Joined: Mar 2004
Posts: 647
san bernardino, california
but the question still stands..well i might as well add to this question. do you guys think that having headers affects the Performance of your muffler? of so what kind of combos have been known to work best for the celica? confused

Re: exauhst question [Re: hector] #222676 Jul 13, 9:27am Jul 13, 9:27am
Joined: Mar 2004
Posts: 647
san bernardino, california
hector OP
Senior Member
2001 Toyota Celica GT
hector OP
Senior Member
2001 Toyota Celica GT

Joined: Mar 2004
Posts: 647
san bernardino, california
http://www.magnaflow.com/07techtips/faq/question10.htm

^^^^this probably helps a little.. i mean its got some info

Question: Why ISN'T a bigger pipe always better?


Answer: Don't be fooled! Bigger is not better! Many people think that having the biggest diameter pipe is the best way to make power.
Not true. Due to a variety of factors, extensive testing is required. We've dyno'd extensively and our systems yield optimum power increases. Some manufacturers claim even higher horsepower numbers.

It is a fine line to reduce backpressure while maintaining good exhaust velocity. It is not about getting the biggest pipe, it is about getting a more efficient pipe diameter while maintaining exhaust velocity.

There has to be a balanced design to enhance the maximum engine output, exhaust gas velocity, and sound. For example, imagine blowing air through a straw (comparing it to a smaller diameter pipe). This would take time to release all the air from your mouth, and you would feel pressure in your mouth while doing so. Now imagine blowing air through a paper towel roll (comparing it to a larger diameter pipe). You will relieve all your air much faster and feel little or no air pressure in your mouth because of the larger capacity of the tube. This is why it is important to get the correct size piping in order to relieve backpressure while maintaining thermal efficiency.

Use the guide below when calculating pipe size for custom exhaust work. Keep in mind that the goal is to improve exhaust flow. In most cases, just changing the restrictive OEM muffler and replacing it with the same size straight-through, Wide Open Performance MagnaFlow muffler will do the job.

To reduce additional backpressure, the OEM exhaust tubing can be replaced with mandrel-bent tubing of the same size or one size up from the OEM. As a general rule, you can enlarge the pipe diameter of your OEM exhaust system by 1/4 to 1/2-inch to increase your horsepower. However, any additional increase in pipe diameter is likely to decrease your Performance; specifically, low end torque.

Re: exauhst question [Re: hector] #222677 Jul 13, 9:37am Jul 13, 9:37am
Joined: Oct 2003
Posts: 1,669
MADERA, CA
2002 Super White Toyota Celica
ravertony
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ravertony
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Posts: 1,669
MADERA, CA
simply put:

- too big of a piping or too much flow will slow your car cause of exhaust velocity

- too small and the engine cant breath out the excess and you slow down too

- good exhausts find that good midpoint where you can get the most peak hp gains

by the way theres a difference in the design and flow of straight through and dual mufflers like you want, its not like you can say cause Kazuma has 3" piping you can get two 1.5" pipings to match it. you can add such things, its like HP gains from mods, you cant add 5hp gain from an Intake with 8hp gain from an exhaust 5+8 does not equal 13hp when it comes to some of these things

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