PT Cruiser Forum  
Advertisements
       

Go Back   PT Cruiser Forum > 2.4L Turbo Forums > Turbo Performance

PT Cruiser Forum

Advertisements
Downpipe/exhaust question

 
Like Tree4Likes

Reply
 
LinkBack Thread Tools Display Modes
  #1 (permalink)  
Old 01 May 2015, 06:08 pm
Regular Cruiser
 
Join Date: Dec 2014
Posts: 177
Default Downpipe/exhaust question

I'm looking to upgrade my O2 housing and downpipe. My plan is to purchase a 3" O2 housing and downpipe from Modern Performance or Ebay (if you have recommendations on which to go through, or if there are others you would recommend let me know). I was looking at the following parts from Modern:

Downpipe for an SRT-4 3" necks down to a 2.25":
O2 Housings & Downpipes - CHQ Downpipe w/ Cut Out Package, 03-05 Neon SRT-4

3" O2 housing:
Exhaust - MPx 3inch O2 Housing, 03-05 Neon SRT-4 / 03-07 PT Cruiser GT

I'm aware that the SRT-4 downpipes are a little shorter than what is needed on the PT so some modification would be required but I have a friend with a lift and a welder in his garage and he'll help me weld up everything so modification isn't that big of deal.

My question is that I've read I need bigger exhaust than a 2.25" if I plan on going much above stock hp (which I do) but since the downpipe has an electric cutout I can open up when I want more power would I be fine for daily driving with just 2.25"? Or would the performance be impacted significantly in that case? The car currently has some straightpiped 2.25" on it and if I could just keep that it would save me some $$$.

Would I be better off just getting a downpipe that is 3" all the way through and welding up some 3" exhaust all the way back or could I get a way with what I stated above? I'm not trying to cut corners but I do want to avoid any unnecessary spending.

If you have any recommendations on downpipes and O2 housings I'm open to suggestions.

I'm currently digging through the forums to see what I can find also so I apologize if I'm asking a question that has already been thoroughly discussed, I just want to order as soon as I can and start modifying!
Reply With Quote
  #2 (permalink)  
Old 01 May 2015, 09:46 pm
NitroPT's Avatar
Obsessed Cruiser
 
Join Date: Jun 2012
Location: USA kalyfornia
Posts: 15,642
Default Re: Downpipe/exhaust question

Gosch what cab I say....stay of the forums about how to build a car.

Use the KISS method of exhaust system.
keep it simple stupid!

Stay with stock i.d. unless you plan on racing frequently.
Don't go more than 2.5 i.d unless you have invested on a race engine for track use.

Try to build a system with mandrel bent pipes with as little bends as posible. The more straight pipe the better.

The CAT is not an enemy to power unless you have invested in a race engine for track competition.

Cutout exhaust is for those that want attention and in most case hurts power unless you have invested in a race engine for the track.

Choose you muffler for it CFM rating and not the name or what forum groupies run.
SPLNeon likes this.
__________________
To view larger pictures simply "click " on the picture!

Dalai Lama
"Share you knowledge. It's the best way to achieve immortality."
ASE MASTER TECHNICIAN
Reply With Quote
  #3 (permalink)  
Old 01 May 2015, 11:29 pm
Regular Cruiser
 
Join Date: Dec 2014
Posts: 177
Default Re: Downpipe/exhaust question

Quote:
Originally Posted by NitroPT View Post
Gosch what cab I say....stay of the forums about how to build a car.

Use the KISS method of exhaust system.
keep it simple stupid!

Stay with stock i.d. unless you plan on racing frequently.
Don't go more than 2.5 i.d unless you have invested on a race engine for track use.

Try to build a system with mandrel bent pipes with as little bends as posible. The more straight pipe the better.

The CAT is not an enemy to power unless you have invested in a race engine for track competition.

Cutout exhaust is for those that want attention and in most case hurts power unless you have invested in a race engine for the track.

Choose you muffler for it CFM rating and not the name or what forum groupies run.
Not sure if you were trying to be rude with some of the statements or not, but thanks for the tips you did give... That much is appreciated.
Reply With Quote
  #4 (permalink)  
Old 02 May 2015, 12:03 am
Regular Cruiser
 
Join Date: Dec 2014
Posts: 177
Default Re: Downpipe/exhaust question

Most of my curiosity about exhaust sizes arises from the debate about back pressure and whether it hurts turbo performance or not, or how much is too much, but I feel if I ask on these forums I will likely be lectured like one would speak to a disobedient child as opposed to information that is conducive to answering my question.

And yes, I want the cutout to be loud no other reason lol.
Reply With Quote
  #5 (permalink)  
Old 02 May 2015, 12:38 am
NitroPT's Avatar
Obsessed Cruiser
 
Join Date: Jun 2012
Location: USA kalyfornia
Posts: 15,642
Default Re: Downpipe/exhaust question

Take it however you want.

IMO,based on phisic's not street phycologiest butt dyno racers there is no datebate about the back pressure subject and TurboCharged engines used on the street. That iis if you follow simple rules and forumlas for thermal dynamics and flow rates.

I posted to help you so that you would not make the mistakes as many have done.

The muffler bypass or cutout will be very loud and you will lose low end torque and make a peaky producing engine. The cutouts in the common loctions cool the exhaust too fast which slow exhaust velocity. Keeping the exhaust as hot as posible as long as you can when it leaves the head is the goal.


BTW I was responding useing my cell phone. Most of the first lines seemed to have not worked out. It should have read:
What can I say, if you stay on the forums to learn about how to build a car instead of talking to performance shops you are going to be making a lot of mistakes.

Lol may not be much better then your impression of my first response?
__________________
To view larger pictures simply "click " on the picture!

Dalai Lama
"Share you knowledge. It's the best way to achieve immortality."
ASE MASTER TECHNICIAN

Last edited by NitroPT; 02 May 2015 at 01:19 am.
Reply With Quote
  #6 (permalink)  
Old 02 May 2015, 09:16 am
Handy_Cruiser's Avatar
Obsessed Cruiser
 
Join Date: Oct 2013
Location: Arkansas
Posts: 10,264
Default Re: Downpipe/exhaust question

Quote:
Originally Posted by FlyinPurplePeopleEater View Post
Most of my curiosity about exhaust sizes arises from the debate about back pressure and whether it hurts turbo performance or not, or how much is too much, but I feel if I ask on these forums I will likely be lectured like one would speak to a disobedient child as opposed to information that is conducive to answering my question.

And yes, I want the cutout to be loud no other reason lol.
Don't worry too much about the tone of responses you get. For some reason, motor heads often sound more asinine when responding on a forum than in real life. I think it has to do with poor writing skills.

As far as NitroPT's comments, he is likely the best expert on this that currently comes to this forum. Not sure why he acts like Mr. Hyde online, but he's a very nice guy on the phone and I suspect the same is true in person. Send him a PM if you really need help. He can likely give you some very good advice if you really want to go faster.

There are lots of older posts about exhaust upgrades. In the past, many folks reported that the stainless down pipes sold on eBay were about as good as any. Most of the best exhaust kits I've found have been "Cat-back", meaning from the behind the catalytic converter to the exhaust tip. So to do a complete system, you will need to select a good down pipe to go with it. Again, there are older post where PT guys did this very successfully based on what they were trying to accomplish with their PT's. You may want to start with those older threads first.
__________________

Last edited by Handy_Cruiser; 02 May 2015 at 09:25 am.
Reply With Quote
  #7 (permalink)  
Old 02 May 2015, 09:33 am
Regular Cruiser
 
Join Date: Dec 2014
Posts: 177
Default Re: Downpipe/exhaust question

Quote:
Originally Posted by NitroPT View Post
Take it however you want.

IMO,based on phisic's not street phycologiest butt dyno racers there is no datebate about the back pressure subject and TurboCharged engines used on the street. That iis if you follow simple rules and forumlas for thermal dynamics and flow rates.

I posted to help you so that you would not make the mistakes as many have done.

The muffler bypass or cutout will be very loud and you will lose low end torque and make a peaky producing engine. The cutouts in the common loctions cool the exhaust too fast which slow exhaust velocity. Keeping the exhaust as hot as posible as long as you can when it leaves the head is the goal.


BTW I was responding useing my cell phone. Most of the first lines seemed to have not worked out. It should have read:
What can I say, if you stay on the forums to learn about how to build a car instead of talking to performance shops you are going to be making a lot of mistakes.

Lol may not be much better then your impression of my first response?
Haha whoops I feel bad with my passive aggressive response. I thought you were saying what can I say, stay off the forums about building cars. I was like dang that's kind of rude. But its all good! I really do appreciate the knowledge you are willing to share!
NitroPT likes this.
Reply With Quote
  #8 (permalink)  
Old 02 May 2015, 10:28 am
NitroPT's Avatar
Obsessed Cruiser
 
Join Date: Jun 2012
Location: USA kalyfornia
Posts: 15,642
Default Re: Downpipe/exhaust question

Off topic: Todd there is no "sorta" like to add to someones response? As far as the MR Hyde, if I had to dance around the point I would be in soooo many endless debates and none personal examples from people of the subject matter that many threads would be locked down. Responding on dozens of forums of various subject for over 15 I have learned be swift and to the point. Also demand that if challenged ask for correction by the showing of empirical information that can be verified factually from anybody. That means other then from your second cousins brother or wiki, other forums with the same less then accurate reporters and just what someone logically thinks the world as we live in it should be? That is what I call theorized fantasy physics.
That said not sure how my responses can be called *asinine?
Now you think I am MR Hyde here you should read the fun on the Quantum Physics forum I am a member on.


Todd thank you for the compliment.

On topic:


The traditional CAT back exhaust are most for aesthetic of a PT. The advertising will "WOW" you into believing most all that you want to expect in a vehicle. The sad thing is many actually reduce the total engine power at measure peak levels. The other sad thing is a few actually use great mufflers and then imprison them in the piping.
The old threads are from most that IMO were on the quest of sound and looks. The few that did have performance in mind went with poor choices balanced with IMO looks. It seems that most who mod their vehicles are more concerned with the sound and looks than in real performance increases.

FlyinPurplePeopleEater as Todd aka HandyCruiser, suggested please feel free to PM me anytime. Many times a one on one conversation goes a little better less convoluted then some threads can become.



*adjective
extremely stupid or foolish.

synonyms: stupid, foolish, brainless, mindless, senseless, idiotic, imbecilic, ridiculous, ludicrous, absurd, nonsensical, fatuous, silly, inane, witless, empty-headed;

^^^Is this what you really think of my responses?
__________________
To view larger pictures simply "click " on the picture!

Dalai Lama
"Share you knowledge. It's the best way to achieve immortality."
ASE MASTER TECHNICIAN

Last edited by NitroPT; 02 May 2015 at 10:33 am.
Reply With Quote
  #9 (permalink)  
Old 02 May 2015, 12:26 pm
Handy_Cruiser's Avatar
Obsessed Cruiser
 
Join Date: Oct 2013
Location: Arkansas
Posts: 10,264
Default Re: Downpipe/exhaust question

Quote:
Originally Posted by NitroPT View Post
That said not sure how my responses can be called *asinine?
Now you think I am MR Hyde here you should read the fun on the Quantum Physics forum I am a member on.
Figures. You're likely an "M-theory" guy. Those are the most pig-headed and asinine of all.
NitroPT likes this.
__________________
Reply With Quote
  #10 (permalink)  
Old 02 May 2015, 12:37 pm
NitroPT's Avatar
Obsessed Cruiser
 
Join Date: Jun 2012
Location: USA kalyfornia
Posts: 15,642
Default Re: Downpipe/exhaust question

Quote:
Originally Posted by Handy_Cruiser View Post
Figures. You're likely an "M-theory" guy. Those are the most pig-headed and asinine of all.
actually I am chronon theorist.
__________________
To view larger pictures simply "click " on the picture!

Dalai Lama
"Share you knowledge. It's the best way to achieve immortality."
ASE MASTER TECHNICIAN
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Exhaust question ? rustytoolss General PT Cruiser Discussions 6 02 Oct 2014 06:56 pm
Exhaust question GTLOZER Tech & Performance Forum 19 22 Dec 2013 11:02 am
exhaust question cruisin03pt Tech & Performance Forum 5 03 Sep 2011 11:42 pm
Exhaust Question matt87951 Tech & Performance Forum 2 20 Sep 2004 10:19 am
Exhaust question wildwind Exterior Accessories Forum 2 07 Dec 2002 11:23 am


All times are GMT -5. The time now is 05:34 am.




Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
LinkBacks Enabled by vBSEO 3.6.0 PL2 © 2011, Crawlability, Inc.
vB.Sponsors