Go Back   Team-BHP > Under the Hood > Technical Stuff


Reply
 
Thread Tools Search this Thread
Old 5th September 2010, 03:02   #106
Senior - BHPian
 
avishar's Avatar
 
Join Date: Oct 2008
Location: kolkata/bangalore,india
Posts: 2,411
Thanked: 686 Times
Default

Guys,i have often come across this question some threads as to whether we can make FFE's more environment friendly and more importantly so that the car does not fail at the PUC test.
Can sport catalysts be a solution?These are catalysts with more greater flow rate than normal catalysts because of the larger chamber size and is as efficient as a normal cat.

Here is the link to the article
Power gains from a sports catalyst

So what to the pundits think?Also will fitting such a catalyst will not really make the exhaust "free flowing" anymore?

PS Its a nice site for learning the basics of tuning.
avishar is offline   Reply With Quote
Old 4th October 2010, 15:31   #107
BHPian
 
wildchild4lyfe's Avatar
 
Join Date: Nov 2009
Location: mumbai
Posts: 405
Thanked: 4 Times
Default

how important is the primary muffler in an FFE?
im running a straight pipe in my car and am really happy with the top end. the low and mid range has slightly gone down though.
so would a primary help?
P.S i got my FFE done at BAR.
wildchild4lyfe is offline   Reply With Quote
Old 4th October 2010, 18:52   #108
Senior - BHPian
 
rjstyles69's Avatar
 
Join Date: Sep 2006
Location: Bengalooru..
Posts: 4,345
Thanked: 789 Times
Default

Quote:
Originally Posted by wildchild4lyfe View Post
how important is the primary muffler in an FFE?
im running a straight pipe in my car and am really happy with the top end. the low and mid range has slightly gone down though.
so would a primary help?
P.S i got my FFE done at BAR.
wildchild by saying primary muffler did you mean the Auxiliary Muffler ? If yes the Auxiliary Muffler is the one which reduces the sound at the end can. This usually has glass and steel wool.

Usually most installs would have an expansion chamber instead of the auxiliary muffler. The expansion chamber is usually installed after the header.

I would recommend that you go back to the installer and the car tuned once. If the power isn't up to your expectation, then check for leaks in the headers.
rjstyles69 is online now   Reply With Quote
Old 5th October 2010, 09:47   #109
BHPian
 
wildchild4lyfe's Avatar
 
Join Date: Nov 2009
Location: mumbai
Posts: 405
Thanked: 4 Times
Default

thanks mate! going to pay him a visit today.
wildchild4lyfe is offline   Reply With Quote
Old 1st November 2010, 19:33   #110
Senior - BHPian
 
Desmosedici's Avatar
 
Join Date: Nov 2009
Location: Mumbai
Posts: 1,378
Thanked: 407 Times
Default

what exactly does an expansion chamber do? and what is an auxilary muffler?

and why is it called 4-2-1 or 4-1 for FFEs. whats the relevance?
Desmosedici is offline   Reply With Quote
Old 30th November 2010, 22:03   #111
BHPian
 
quadra's Avatar
 
Join Date: Sep 2006
Location: Blore
Posts: 542
Thanked: 52 Times
Default

My Spark's muffler is kind of broken due to rust (will post a pic soon). The OEM muffler costs around 3k+.

1. Should i go for OEM / Aftermarket muffler ?
2. How much will an aftermarket muffler cost ?? warranty ??
3. I want my vehicle to be rev freely and not get restricted. Does an aftermarket muffler allow this ?? or i need a full FFE ?/
quadra is offline   Reply With Quote
Old 23rd January 2011, 10:06   #112
BHPian
 
webblescott's Avatar
 
Join Date: May 2006
Location: Kasaragod/Bangalore
Posts: 152
Thanked: 101 Times
Default Re: sensors

Hi, i would like to go for a FFE on my i20 Asta Crdi, Let me know which one to choose ? without harming my machine. Someone suggested me Rimmers Bolt on stuff, i am not much into this FFE thing but still i need a decent sound on my ride.

Quote:
Originally Posted by DirtyDan View Post
Modern diesels with turbos have a sensor or sensors in the exhaust that sniff for heat and chemical content of exhaust gas and then feed this info back to the vehicle's computer. The computer (chip) then controls things like the EGR (exhaust gas recycle valve) and maybe the vanes on the turbo and some other things as well.

My point is, that if you let someone do work on your exhaust or install a product that disrupts these sensors then you will seriously disrupt the information your vehicle's computer recieves and you will probably greatly harm the performance. Make sure the people who work on your vehicle know what they are doing. You can not just bolt on a higher diameter unrestricted exhaust system. You have to account for the sensors.
webblescott is offline   Reply With Quote
Old 23rd January 2011, 11:53   #113
Newbie
 
Join Date: Jun 2004
Location: TVM
Posts: 10
Thanked: 2 Times
Default Re: What's a free flow exhaust ?

Are we not required by law to fit a catalytic converter in our cars or to rephrase the question, is it not illegal to remove the cat con?
Will it cause my car to fail a PUC test and more importantly will my car become less green if I fit an FFE?

Hari
Hari is offline   Reply With Quote
Old 26th January 2011, 11:02   #114
Senior - BHPian
 
Join Date: Apr 2008
Location: Dombivli
Posts: 2,626
Thanked: 1,191 Times
Default Exhaust Headers

I am sure this topic will have been discussed somewhere on the forums, though I was unable to locate the exact threads. So mods, if this topic has been discussed, please merge this thread with the right one.

Is it possible to only fit exhaust headers on a car, without touching the catcon and other components? Will it provide more power than the stock exhaust manifold setup?

To the best of my knowledge replacing the manifold with headers should allow the exhaust gases to flow with less restriction and this will ease up the load on the engine. I am also aware it will be lesser than a complete FFE. However I am only interested to know if simply moving from manifold to headers will produce any improvements. And if yes, how much?
honeybee is offline   Reply With Quote
Old 27th January 2011, 15:04   #115
BHPian
 
Honda_Power's Avatar
 
Join Date: Dec 2009
Location: Bangalore
Posts: 66
Thanked: 16 Times
Default Re: Exhaust Headers

Hi,

Let me split and address your last update in parts.

"Is it possible to only fit exhaust headers on a car without touching the catcon and other components?"

Answer is Yes, if the B (catcon) and the C (endcan) are in good condition because
after all the tuners try to replicate the set up and fabricate them accordingly.
@performance gurus: Please correct me if i am wrong.

Will it provide more power than the stock exhaust manifold setup?

This should be answered by the performance gurus and i will be closely monitoring
the thread. Although i believe this has nothing to do with the end can as it has the
muffler placed and retaining it will have the exhaust note muted similar to stock
though you can have the end can fabricated and muffler designed to have a muted
exhaust note.

You can also follow the below thread to understand the impact of removing the catcon to achieve an performance gain.

http://www.team-bhp.com/forum/techni...its-worth.html (Removing a Catalytic Converter (Cat Con) - Do you guys think its worth it?)

Hope this helps.

Cheers,
Ayyappan
Honda_Power is offline   Reply With Quote
Old 29th January 2011, 09:22   #116
Senior - BHPian
 
Join Date: Apr 2008
Location: Dombivli
Posts: 2,626
Thanked: 1,191 Times
Default Re: Exhaust Headers

Quote:
Originally Posted by Honda_Power View Post
You can also follow the below thread to understand the impact of removing the catcon to achieve an performance gain.
Thanks Ayyappan for the answer. I am not at all interested in removing the catcon. The only mod I am looking for is to replace the exhaust manifold with headers, maybe make it a bit quieter in the process too. As yet I haven't had any trouble with the existing exhaust system in terms of rattles or any other issues. All the PUC checks are being carried out on time and the readings are quite good.

The only objective in this exercise for me is to see if by using exhaust headers I can get x number of horses more from the existing engine. This increased power may help in better acceleration or maybe better AC performance. And this x number of horses will then be compared to the cost of making the mod and that's what will influence my final decision.
honeybee is offline   Reply With Quote
Old 16th February 2011, 14:24   #117
BHPian
 
Join Date: Sep 2008
Location: bangalore
Posts: 42
Thanked: 3 Times
Default Re: Exhaust Headers

Quote:
Originally Posted by honeybee View Post
.

The only objective in this exercise for me is to see if by using exhaust headers I can get x number of horses more from the existing engine. This increased power may help in better acceleration or maybe better AC performance. And this x number of horses will then be compared to the cost of making the mod and that's what will influence my final decision.
I have spoken to several people regarding this who are into mods and they have all given me similar opinion.
You cannot just fit and endcan which make a growling noise and claim that you have a FFE. The entire exhasut system needs to be changed right from the header to the muffler to get performance gains. Obviously, the CATCON has to be removed. You cant have both ie perfromance as well as FE/ meeting emission norms.
Decide what you want at the end of the day FE / performance and then go about it.
prats is offline   Reply With Quote
Old 18th February 2011, 20:48   #118
Senior - BHPian
 
Join Date: Apr 2008
Location: Dombivli
Posts: 2,626
Thanked: 1,191 Times
Default Re: Exhaust Headers

Quote:
Originally Posted by prats View Post
I have spoken to several people regarding this who are into mods and they have all given me similar opinion.
You cannot just fit and endcan which make a growling noise and claim that you have a FFE. The entire exhasut system needs to be changed right from the header to the muffler to get performance gains. Obviously, the CATCON has to be removed. You cant have both ie perfromance as well as FE/ meeting emission norms.
Decide what you want at the end of the day FE / performance and then go about it.
Err, is the endcan the same as an exhaust manifold/headers? I guess not, though I am not an auto expert. To the best of the knowledge I have gained from the internet, the job of the exhaust manifold is to collect the exhaust gases from the cylinders and pass them onto the exhaust pipe which will take them out of the vehicle. An exhaust manifold can be replaced by headers, which have an independent pipe routed from each cylinder to collect the gases. The headers, by design, are supposed to allow easy passage of the gases to the tailpipe. So my logic is if I replace the stock manifold with headers (maybe custom made), I should get some performance increase. I am not interested in fully replacing the exhaust, getting the catcon out or getting any particular exhaust notes.

If my above reasoning is correct, simply by replacing the stock manifold with headers, I should get x amount of performance boost. I need someone to confirm if the above reasoning is correct, and if yes, give me an approximate idea about the improvement, i.e. will it be 1%, 5% or some other figure.
honeybee is offline   Reply With Quote
Old 27th July 2011, 21:30   #119
Senior - BHPian
 
Desmosedici's Avatar
 
Join Date: Nov 2009
Location: Mumbai
Posts: 1,378
Thanked: 407 Times
Default Re: What's a free flow exhaust ?

Hi, have a quick question on FFEs. Gurus, please help.

Can the sound be tuned in such a way that at idling and in normal city driving, the sounds stay as stock. Post 3000 - 4000 RPMs while redlining, the meaty exhaust note comes into picture.

Is such a kind of setup possible. Kindly Assist.

Thanks

Raj
Desmosedici is offline   Reply With Quote
Old 28th July 2011, 00:32   #120
BANNED
 
Join Date: Nov 2006
Location: London
Posts: 5,012
Thanked: 147 Times
Default Re: What's a free flow exhaust ?

Is this for your Gypsy? Remember the multiplication rule. If the gypsy is a 1L, your exhaust should be atleast 5L in volume. So do calculations accordingly. Also, make sure you dont alter the diameter of the pipe much. Max you should go to is 1-3/4inch. I have seen people have MASSIVe 2-3 inch pipes etc and it is all nonsense. also, dont have an exhaust tip. It helps a little trust me.
Cyrus43 is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Free flow exhaust!!! shalini_g Modifications & Accessories 1 27th June 2006 11:23
free flow exhaust muffler for ohc club_honda Modifications & Accessories 23 14th June 2005 04:10
Free flow exhaust tuner in Pune chetanhanda Modifications & Accessories 5 5th May 2005 16:10
free flow exhaust sanket12 Modifications & Accessories 4 29th June 2004 20:09
K&N Filter and Free flow exhaust gbharani Modifications & Accessories 2 19th April 2004 23:46


All times are GMT +5.5. The time now is 10:16.

Copyright 2000 - 2017, Team-BHP.com
Proudly powered by E2E Networks