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Joined: Nov 2003
Posts: 88
driver
Member
driver Apr 6, 9:50am - #146550 

Member
2001 Toyota Celica SX

Joined: Nov 2003
Posts: 88
Australia
exhaust taken off sunds mad

but is it okay for the car or does it damage it
Joined: Aug 2003
Posts: 6,372
Speed4TheNeed
Caleb
Speed4TheNeed Apr 6, 12:45pm - #146551 

Caleb
2000 Toyota Celica

Joined: Aug 2003
Posts: 6,372
New Orleans, LA
taking off your exhaust won't hurt your car one bit.

it'll actually increase Performance (reduces backpressure greatly, obviously) which is good

but it'll blow emissions like a mother, which is bad. and obviously it's illegal because of this.
Joined: Apr 2003
Posts: 2,451
DiabloGTS
Wheezy Joe
DiabloGTS Apr 6, 12:49pm - #146552 

Wheezy Joe
2002 Kawasaki Ninja 250

Joined: Apr 2003
Posts: 2,451
Lafayette, LA
how is a decrease in back pressure an increase in Performance? confused

To have played and laughed with enthusiasm
and sung with exultation
To know even one life has breathed easier
This is to have succeeded.
Joined: Jul 2003
Posts: 500
GTSHYPR
Bruce Leroy
GTSHYPR Apr 6, 1:00pm - #146553 
2002 Spectra Blue Mica Toyota Celica GTS
Bruce Leroy
2002 Toyota Celica GTS

Joined: Jul 2003
Posts: 500
Salisbury, MD
Originally Posted by DiabloGTS
how is a decrease in back pressure an increase in Performance? confused


Yeah I thought that if you loose backpressure you will loose Performance.

I'm gonna take your little Civic. Dust it off. Turn it sideways and stick it straight up you candy A*s.
Joined: Aug 2003
Posts: 6,372
Speed4TheNeed
Caleb
Speed4TheNeed Apr 6, 1:01pm - #146554 

Caleb
2000 Toyota Celica

Joined: Aug 2003
Posts: 6,372
New Orleans, LA
Originally Posted by DiabloGTS
how is a decrease in back pressure an increase in Performance? confused


because it allows your engine to perform better.

as you know, air tends to 'stick' to surfaces--any surface. with an exhaust, air must be 'pushed' out of it and your engine has to work to do that.

without an exhaust, your engine just 'throws' it's emissions out without having to work as hard as pushing it out through a piping.

thats why aftermarket perforamance exhausts have a wider diameter--so air has less friction as it travels along the length of the piping thumbsup
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Posts: 6,372
Speed4TheNeed
Caleb
Speed4TheNeed Apr 6, 1:02pm - #146555 

Caleb
2000 Toyota Celica

Joined: Aug 2003
Posts: 6,372
New Orleans, LA
Originally Posted by GTSHYPR
Originally Posted by DiabloGTS
how is a decrease in back pressure an increase in Performance? confused


Yeah I thought that if you loose backpressure you will loose Performance.


nope. you will lose some initial torque though.

some backpressure is good for torque, however..in the higher rpms your torque will be made up and your whp will incease, also. thumbsup
Joined: Aug 2003
Posts: 6,372
Speed4TheNeed
Caleb
Speed4TheNeed Apr 6, 1:05pm - #146556 

Caleb
2000 Toyota Celica

Joined: Aug 2003
Posts: 6,372
New Orleans, LA
in all aftermarket Performance exhausts & headers, initial torque will be DECREASED, this is because backpressure is reduced therefore your lower rpm torque decreases. (in an Intake your initial torque also decreases).

however, the gains on the top-end are considerred more than worth it because you gain more at the top than you lose at the bottom. that's why theres a market for aftermarket bolt-ons. thumbsup
Joined: Jul 2003
Posts: 500
GTSHYPR
Bruce Leroy
GTSHYPR Apr 6, 1:09pm - #146557 
2002 Spectra Blue Mica Toyota Celica GTS
Bruce Leroy
2002 Toyota Celica GTS

Joined: Jul 2003
Posts: 500
Salisbury, MD
Well I guess ya learn something new everyday.

I'm gonna take your little Civic. Dust it off. Turn it sideways and stick it straight up you candy A*s.
Joined: Aug 2003
Posts: 6,372
Speed4TheNeed
Caleb
Speed4TheNeed Apr 6, 1:12pm - #146558 

Caleb
2000 Toyota Celica

Joined: Aug 2003
Posts: 6,372
New Orleans, LA
Originally Posted by GTSHYPR
Well I guess ya learn something new everyday.


thumbsup thats what i'm here for--to learn and to hopefully help some other people learn as well.
Joined: Oct 2003
Posts: 214
marajade
Member
marajade Apr 6, 1:59pm - #146559 

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2000 Toyota Celica GT

Joined: Oct 2003
Posts: 214
Denmark
Originally Posted by GTSHYPR
Well I guess ya learn something new everyday.


Me too... well not in great detail - but something grin

1988 Toyota Celica 2.0 GTi-16 and 2000 Toyota Celica VVT-i
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Posts: 3,077
slidr
Specialist
slidr Apr 6, 4:26pm - #146560 

Specialist
2000 Toyota Celica

Joined: Sep 2003
Posts: 3,077
Saint Louis, MO
Originally Posted by sPeEd4tHeNeEd

taking off your exhaust won't hurt your car one bit.

it'll actually increase Performance (reduces backpressure greatly, obviously) which is good

but it'll blow emissions like a mother, which is bad. and obviously it's illegal because of this.
This will not affect your emissions one bit if you remove the exhaust after the cat, and that's not why it's illegal. It's illegal due to the annoying loud sound that it would produce.

Also, reducing back pressure isn't always good. Reducing it some can prove to be beneficial to Performance, but reducing it too much is just asking for problems.

Back pressure is there for a reason. It's not a mistake that it's there.

When too little back pressure is present then some of the fresh air entering the engine leaves with the exhaust before the exhaust valve closes. So when the engine isn't getting enough air then the computer compensates by decreasing the fuel too.

Therefore, less power.


Back pressure is essential for allowing the correct amount of air to enter and exit the engine when it's supposed to, and on the correct stroke. You don't want Intake air exiting on the exhaust stroke.
Joined: Aug 2003
Posts: 6,372
Speed4TheNeed
Caleb
Speed4TheNeed Apr 6, 4:40pm - #146561 

Caleb
2000 Toyota Celica

Joined: Aug 2003
Posts: 6,372
New Orleans, LA
Originally Posted by slidr
Originally Posted by sPeEd4tHeNeEd
taking off your exhaust won't hurt your car one bit.

it'll actually increase Performance (reduces backpressure greatly, obviously) which is good

but it'll blow emissions like a mother, which is bad. and obviously it's illegal because of this.
This will not affect your emissions one bit if you remove the exhaust after the cat, and that's not why it's illegal. It's illegal due to the annoying loud sound that it would produce.

Also, reducing back pressure isn't always good. Reducing it some can prove to be beneficial to Performance, but reducing it too much is just asking for problems.

Back pressure is there for a reason. It's not a mistake that it's there.

When too little back pressure is present then some of the fresh air entering the engine leaves with the exhaust before the exhaust valve closes. So when the engine isn't getting enough air then the computer compensates by decreasing the fuel too.

Therefore, less power.


Back pressure is essential for allowing the correct amount of air to enter and exit the engine when it's supposed to, and on the correct stroke. You don't want Intake air exiting on the exhaust stroke.


exhaust is an accumulative term, or it can mean just the rear piping.

the actual 'exhaust' includes everything from your engine to your tailpipe.

a lot of time we use the term exhaust just to mean the part from the header/downpipe to the tailpipe.
Joined: Jan 2004
Posts: 1,248
Rocketman
Specialist
Rocketman Apr 6, 7:06pm - #146562 

Specialist
01 Toyota Celica

Joined: Jan 2004
Posts: 1,248
Idaho Falls, ID
Most people don't know that exhausts come of the header. They are made of pipe. Usually metal pipe. Sometimes there will be catalytic converters in the pipe to help with the exhaust smell. It can be really smelly without a Catalytic converter!! Sometimes Exhausts have resonators on them. This can make things resonate. I am not exactly sure what...but you get the idea.

Just my 2 bits!!!












BUAWAAHAHAHAHAHAHAHAHAHAAHH!!
Joined: Sep 2003
Posts: 3,077
slidr
Specialist
slidr Apr 6, 11:04pm - #146563 

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2000 Toyota Celica

Joined: Sep 2003
Posts: 3,077
Saint Louis, MO
Originally Posted by Rocketman
Most people don't know that exhausts come of the header. They are made of pipe. Usually metal pipe. Sometimes there will be catalytic converters in the pipe to help with the exhaust smell. It can be really smelly without a Catalytic converter!! Sometimes Exhausts have resonators on them. This can make things resonate. I am not exactly sure what...but you get the idea.

Just my 2 bits!!!












BUAWAAHAHAHAHAHAHAHAHAHAAHH!!
I think the resonator reduces the sound of the exhaust.

Aqua Teen Hunger Force...number one in the hood, G
Joined: Sep 2003
Posts: 3,077
slidr
Specialist
slidr Apr 6, 11:06pm - #146564 

Specialist
2000 Toyota Celica

Joined: Sep 2003
Posts: 3,077
Saint Louis, MO
Originally Posted by sPeEd4tHeNeEd
Originally Posted by slidr
Originally Posted by sPeEd4tHeNeEd
taking off your exhaust won't hurt your car one bit.

it'll actually increase Performance (reduces backpressure greatly, obviously) which is good

but it'll blow emissions like a mother, which is bad. and obviously it's illegal because of this.
This will not affect your emissions one bit if you remove the exhaust after the cat, and that's not why it's illegal. It's illegal due to the annoying loud sound that it would produce.

Also, reducing back pressure isn't always good. Reducing it some can prove to be beneficial to Performance, but reducing it too much is just asking for problems.

Back pressure is there for a reason. It's not a mistake that it's there.

When too little back pressure is present then some of the fresh air entering the engine leaves with the exhaust before the exhaust valve closes. So when the engine isn't getting enough air then the computer compensates by decreasing the fuel too.

Therefore, less power.


Back pressure is essential for allowing the correct amount of air to enter and exit the engine when it's supposed to, and on the correct stroke. You don't want Intake air exiting on the exhaust stroke.


exhaust is an accumulative term, or it can mean just the rear piping.

the actual 'exhaust' includes everything from your engine to your tailpipe.

a lot of time we use the term exhaust just to mean the part from the header/downpipe to the tailpipe.
That's why it matters where you remove it at. Taking it off from the rear axle on back will help Performance a little, but would just be too noisy.

Taking it off before the cat and from the header could cause some problems.

It all depends on where he takes it off at. He wasn't really too specific about it.

Aqua Teen Hunger Force...number one in the hood, G
Joined: Jul 2002
Posts: 10,123
VSGTS14
05 WRB
VSGTS14 Apr 6, 11:28pm - #146565 

05 WRB
2005 Subaru WRX STi

Joined: Jul 2002
Posts: 10,123
Milford, NJ
that's how nascar's run...


we had a tundra getting headers installed on it and the mechanic just had open headers on..no exhaust...



you do not want to know how loud it was...omg, it was awesome.

SUBARU TECNICA INTERNATIONAL
Joined: Jan 2004
Posts: 1,248
Rocketman
Specialist
Rocketman Apr 7, 2:37am - #146566 

Specialist
01 Toyota Celica

Joined: Jan 2004
Posts: 1,248
Idaho Falls, ID
Originally Posted by slidr
Originally Posted by Rocketman
Most people don't know that exhausts come of the header. They are made of pipe. Usually metal pipe. Sometimes there will be catalytic converters in the pipe to help with the exhaust smell. It can be really smelly without a Catalytic converter!! Sometimes Exhausts have resonators on them. This can make things resonate. I am not exactly sure what...but you get the idea.

Just my 2 bits!!!












BUAWAAHAHAHAHAHAHAHAHAHAAHH!!
I think the resonator reduces the sound of the exhaust.


I KNOW!!! It was a joke...gone bad...
Joined: Mar 2004
Posts: 815
5280vvti
Senior Member
5280vvti Apr 7, 2:56am - #146567 

Senior Member
2002 Toyota Celica GT

Joined: Mar 2004
Posts: 815
CO
Originally Posted by DiabloGTS
how is a decrease in back pressure an increase in Performance? confused


wtf You'll lost low end but it'll more than make up for it in top end
Joined: Aug 2003
Posts: 2,269
NorwayGT
Specialist
NorwayGT Apr 7, 3:01am - #146568 

Specialist
2004 Dodge SRT4

Joined: Aug 2003
Posts: 2,269
Seattle, WA
lmao. i took off my axle back and listend to it for a while, then i installed kazuma, and let me tell you...kazuma is LOUDER

was....5speed with i/h/e
15.41 @ 89.30mph 2.282 60'

is....04 srt4 stock
13.936 100.15mph 2.177 60'
Joined: Jan 2004
Posts: 1,612
eric_h
2low2slow
eric_h Apr 7, 3:26am - #146569 

2low2slow
2002 Toyota Celica GT

Joined: Jan 2004
Posts: 1,612
St.George, UT
Originally Posted by slidr
Originally Posted by sPeEd4tHeNeEd
Originally Posted by slidr
Originally Posted by sPeEd4tHeNeEd
taking off your exhaust won't hurt your car one bit.

it'll actually increase Performance (reduces backpressure greatly, obviously) which is good

but it'll blow emissions like a mother, which is bad. and obviously it's illegal because of this.
This will not affect your emissions one bit if you remove the exhaust after the cat, and that's not why it's illegal. It's illegal due to the annoying loud sound that it would produce.

Also, reducing back pressure isn't always good. Reducing it some can prove to be beneficial to Performance, but reducing it too much is just asking for problems.

Back pressure is there for a reason. It's not a mistake that it's there.

When too little back pressure is present then some of the fresh air entering the engine leaves with the exhaust before the exhaust valve closes. So when the engine isn't getting enough air then the computer compensates by decreasing the fuel too.

Therefore, less power.


Back pressure is essential for allowing the correct amount of air to enter and exit the engine when it's supposed to, and on the correct stroke. You don't want Intake air exiting on the exhaust stroke.


exhaust is an accumulative term, or it can mean just the rear piping.

the actual 'exhaust' includes everything from your engine to your tailpipe.

a lot of time we use the term exhaust just to mean the part from the header/downpipe to the tailpipe.
That's why it matters where you remove it at. Taking it off from the rear axle on back will help Performance a little, but would just be too noisy.

Taking it off before the cat and from the header could cause some problems.

It all depends on where he takes it off at. He wasn't really too specific about it.


i believe at a certain point in reducing backpressure the top end will not make up for the low end, but what the hay every engines different

[Linked Image]
A boats a boat, but the mystery box could be anything....Even a boat!
Joined: Oct 2003
Posts: 92
shabu
Member
shabu Apr 7, 2:48pm - #146570 
Member

Joined: Oct 2003
Posts: 92
There is a lot of half-right information in this thread. "Backpressure" by itself does not add torque - a smooth pattern of exhaust gas pulses leaving the engine pulling each other along adds torque. Unbolting your stock axleback section can lose some torque because it shortens the length of exhaust pipe that those pulses travel down. If you look at the TRD exhaust, which actually GAINS low end torque, the path the piping takes makes it longer than stock, so with a free flowing muffler it adds power and torque. Another reason some aftermarket exhausts lose low end is they use larger than stock piping, again allowing those exhaust pulses to slow down (picture water going through a bigger or smaller pipe) also losing low end torque. If you made a straight mandrel bent pipe from the cat back, following the same path as the TRD piping, with the same diameter piping as stock you would have much less backpressure, but you would gain horsepower AND torque (and a hell of a lot of noise!)

**DONOTDELETE**
Unregistered
Anonymous Apr 7, 6:08pm - #146571 
Unregistered



^^ thank you for summarizing this thing...!! spineyes
Joined: Jul 2003
Posts: 460
theretiredpimp
Senior Member
theretiredpimp Apr 9, 10:09am - #146572 

Senior Member
2000 Toyota Celica GT

Joined: Jul 2003
Posts: 460
Camden, NJ
I learned a thing or two today. thumbsup

They call me Superman, leap tall hoes in a single bound...
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