3inch exhaust .How to make it quieter ?

[HM Headers]

Originally Posted by HM Headers

Change your center muffler for a chambered 15 to 18 inch center offset muffler and weld in a hotdog in the rear section.

2 1/2 in the best size for Falcon I6 for torque and power gains throughout the rev range, but if you budget doesnt allow this just do as mentioned above and this will fix your droning and in cabin boom.

Center Center front muffler for the front section.

[Stav]

Originally Posted by HM Headers

Change your center muffler for a chambered 15 to 18 inch center offset muffler and weld in a hotdog in the rear section.

2 1/2 in the best size for Falcon I6 for torque and power gains throughout the rev range, but if you budget doesnt allow this just do as mentioned above and this will fix your droning and in cabin boom.

Thanks for the info Hm Headers .I appreciate it. The car isnt droning .It sounds great. Problem is that it is a work vehicle spending 4 to 6 hours driving a day.If I was 20 or 18 it would definately stay.
I know that 2.5 inch is commonly said to be the best for power and torque but I have timed the car and can attest to the fact that a single 2.5 inch system does have less accleration power from low down ,midrange and top end over a 3 inch. perhaps the 2.5 inch is the best for a standard or mildly modified six instead of a car like mine which is up a bit more than mild.

[The Monty]

Exactly right Stav. I was told my 60's would blow out, no torque down low, and at half track Id be suffering, and not make it back up in the top end.
But when you go out later on in similar conditions, and run faster 60', 660 ft, 660 mph, 1/4 and MPH, you know that people are pulling your leg.
And thats with a stock driveline, its not like I can change my launch technique much at all, and its at Willowbank, which is always kept to a high standard.
It is true I would have run faster with the quicker 60', but like was said by Casper, your 60' isnt going to be that different in different weather conditions, so its quicker due to something else, and that something else was the exhaust.
I had backed up the 15.37 in similar conditions already, then to run 14.9, 14.9, 14.9 and 15.00 in similar conditions again, you know that something is going on.
I do agree I may have came across a little obnoxiously, but there is a whole thread in the 6 cylinder part of these forums, and it seems like every person who doesnt like the three inch, or is afraid to try it, disses it hardcore with comments like it wont work, youll loose power, etc etc. It may well loose power on a stock car, but not many of us have stock cars on here.
Every single person that is using a three inch on the e series or Au i6, or the XR6T exhaust on the B series (3.18ish inches flow IIRC), or 3 inch on them, has made more power, or dropped there E.T.
I dont see how people can say they dont work, it just doesnt make sense. Im not saying (I know I did before, but I shouldnt have come across so strong) people shouldnt have there own opinions, its just that maybe if you guys put a three inch exhaust on a NA 6, test it, then see if you like it, instead of just saying they wont work, maybe people wouldnt get all the misinformation thats around.
I know one person from the B-series forum who was told by an exhaust shop, that having a 2x2.25 inch XR6T exhaust on was so ridiculous, as the car would have no back pressure, and not be able to travel over 60kph, it would just not be able to accelerate. He later on went on to run a 14.4
I dont jump up and down when someone says they put a 4 inch on an XR6T, I have no freaking idea about exhausts for them , so I stay out of it, and leave it to people that have tried them, and know if they work.


Any way, thats my whinge, I appologise for being a Johson.

[Autocade]

Stav
Is it possible that being a Wagon the sound is resonating more in the larger cabin area than a Sedan
I reckon you might be the first person to fit a 3" to a Wagon so mufflers etc that reduce noise on sedans may not work as well on your wagon

Good Luck
Autocade

[Stav]

Originally Posted by Autocade

Stav
Is it possible that being a Wagon the sound is resonating more in the larger cabin area than a Sedan
I reckon you might be the first person to fit a 3" to a Wagon so mufflers etc that reduce noise on sedans may not work as well on your wagon

Good Luck
Autocade

Hi mate .No its not because it is a wagon. When I am in a carpark and start my car people look from around 20 metres away.People upstairs in second level buildings tell me they knew I had arrived because of the lumpy idle.heehhe.Maybe Ill just stick cotton wool in my ears because i still love it... I went to a job in St Mary's last week and the factory workers (blokes) came out to see what the heck type of beast it was!! It sounds very good..but loud. Have you seen those blue wrx's with the big bonnet scoop? The noisy ones? They think that theyre intimidating..the wagon drowns their noise out..it is funny.. it wipes the smile off their faces.

One thing though..when it gets up on the freeway it is quieter.

[Ruger]

Originally Posted by The Monty

Exactly right Stav. I was told my 60's would blow out, no torque down low, and at half track Id be suffering, and not make it back up in the top end.
But when you go out later on in similar conditions, and run faster 60', 660 ft, 660 mph, 1/4 and MPH, you know that people are pulling your leg.
And thats with a stock driveline, its not like I can change my launch technique much at all, and its at Willowbank, which is always kept to a high standard.
It is true I would have run faster with the quicker 60', but like was said by Casper, your 60' isnt going to be that different in different weather conditions, so its quicker due to something else, and that something else was the exhaust.
I had backed up the 15.37 in similar conditions already, then to run 14.9, 14.9, 14.9 and 15.00 in similar conditions again, you know that something is going on.
I do agree I may have came across a little obnoxiously, but there is a whole thread in the 6 cylinder part of these forums, and it seems like every person who doesnt like the three inch, or is afraid to try it, disses it hardcore with comments like it wont work, youll loose power, etc etc. It may well loose power on a stock car, but not many of us have stock cars on here.
Every single person that is using a three inch on the e series or Au i6, or the XR6T exhaust on the B series (3.18ish inches flow IIRC), or 3 inch on them, has made more power, or dropped there E.T.
I dont see how people can say they dont work, it just doesnt make sense. Im not saying (I know I did before, but I shouldnt have come across so strong) people shouldnt have there own opinions, its just that maybe if you guys put a three inch exhaust on a NA 6, test it, then see if you like it, instead of just saying they wont work, maybe people wouldnt get all the misinformation thats around.
I know one person from the B-series forum who was told by an exhaust shop, that having a 2x2.25 inch XR6T exhaust on was so ridiculous, as the car would have no back pressure, and not be able to travel over 60kph, it would just not be able to accelerate. He later on went on to run a 14.4
I dont jump up and down when someone says they put a 4 inch on an XR6T, I have no freaking idea about exhausts for them , so I stay out of it, and leave it to people that have tried them, and know if they work.


Any way, thats my whinge, I appologise for being a Johson.

Mate as much as its annoying dont listen to other peoples whinge and put down your suggestion. Stick it to em and shove it in their face.
When i was getting my xr8 exhaust fitted to my ba i had a shop say it wont fit, no way blah blah blah he goes come back when you find someone that will fit it because it physically wont fit. Basically tried to humiliate me...... you know what i did? i got the thing fitted and took it to him and slapped it in his face. bloody retard
I had a whole bunch of people say twin throttle bodies wouldnt work on the BA 6..... i fitted it sorted it out, went out in worse condition and dropped 2 tenths off my time (14.5 stock driveline, unopened engine, stock diff gears 3.23 single legger) a few people were dumbfounded

dont listen to their crap. the hard part is finding someone thatll do what you want them to do and not what they want to do.

[blackers10]

losing down low torque isnt exactly a big problem on the autos anyway...
as soon as you fit a stall you have no down low torque to start with.. and its all go from what ever stall speed

so really its ALL benefits for a 3" on an auto with a high stall

[stiddy]

hehe..

[blackers10]

exactly stiddy.. exactly

[Cooper69S]

I'd be interested to know if anyone has some factual data to back up the idea of a 3" being too big. The same thing has been debated over and over in the windsor section as well, with people saying that a 3" is too big for a standard or mildly worked 302 but my experiences and everything I've read says that the 3" is better than a 2.5" for the good old 5L...

Obviously some of you guys have proven that the 3" has benefited the 4L as well. There was an article in autospeed a couple of years ago, where they challenged the same idea - basically they said that they had never seen a dyno result where an bigger exhaust gave a detrimental result. does anyone have any cold hard facts to prove that autospeed theory wrong?

[blackers10]

think sombody NEEDS to go from 2.5 to 3 " with back to back dyno and 1/4 mile runs
only way its gonna be proven

[bingoTE50]

I just had my exhaust done on the weekend and was told that twin 2 1/4 or single 2 1/2 would flow up to 550hp . Mine has twin 2 1/4 with sports mufflers and no resonator.
Sounds excellent to me.
I am no real expert and I have seen The montys setup and he will swear by it.But he has also worked on the induction which may be helping the engine breathe better and suit the 3 inch exhaust. Maybe if you only do one side of the equation you do not have any gain or even losses.

[Stav]

Originally Posted by blackers10

think sombody NEEDS to go from 2.5 to 3 " with back to back dyno and 1/4 mile runs
only way its gonna be proven

With a lukey 2.5 inch I got 15.124 1/4 mile and 141 rwkws tuned
I Put a 3 inch cat,muffler and left the rest at 2.5 inch.147 rwkws tuned 14.773 1/4 mile.Recently I ditched the rear 2.5 inch resonator and piping. The car feels like it has more power and torque.It is not tuned either. It is going to get a slightly quieter muffler in the near future.

The 3 inch is better than 2.5 inch for power and torque but I think that it is not the best.

[mik]

another vote for 3" i have no facts or figures but bumometer tells me its better, may not have gained much torque down low but definatley have`nt lost it and midrange up it seems to haul.

[Gammaboy]

Quieter?
Easy:

[Stav]

I found a cheaper option.Also helps when I get hungry..

http://images.dpchallenge.com/images...ited_78716.jpg

[Damage]

The anti 3" members should read up a Joe Sherman article about a 302(306) Windsor putting out 402hp at 6500rpm using a 750cfm Holley, in the article I think he went from 650 to 750 and gained 10hp, but in theory a 600cfm would be to big, but in theory years ago it was proved that 300mph could never be achieved in under 5 seconds , go figure?

Just because in theory 3" is to big, they used to say that about 2.5" too.

[Stav]

I went in and got the exhaust checked. My catalytic converter had a crack in it.The crack was welded and the car is much more quieter but the performance is down alot.Looks like the leak was giving me the benefit of extra flow.

[JC]

What does a 600cfm holley on a 302 have to do with a 3" exhaust on a 4.0 (250) I6?? Oh, I know - because Toyota use a tiny little turbo on their sprinter years ago, I should be able to use it on my V10 to double power output.

[Damage]

Originally Posted by JC

What does a 600cfm holley on a 302 have to do with a 3" exhaust on a 4.0 (250) I6?? Oh, I know - because Toyota use a tiny little turbo on their sprinter years ago, I should be able to use it on my V10 to double power output.

Absolutely nothing, but I guess you couldn't work that out.
Just because in theory something shouldn't work it may just do the opposite.

I used the carby size as an example, in theory you shouldn't need a carburetor with a bigger CFM than 575.5 with an optimistic 100% volumetric efficiency at 6500rpm, but Joe Sherman proved different, it could be the same thing with the 3" exhaust vs 2.5". But with your smart remarks I am sure you understand this, or do you need a cardboard book with bright coloured pictures to be included.

[Mark351]

So now it's been confirmed the leak was the source of 'extra performance', is the 3" really that much better over the 2.5" on your wagon?

I just find it amusing when people debate 'fact' with experts like someone from HM Headers who have designed and fitted hundreds, nee thousands of headers/exhausts to cars, but because someone fits one exhaust to their car they know better. Neither Chris Bluepower or Rob Herrod who worked on my car suggested going 3" was going to make more power and was worth the $$. In the end, it's your own $$ you're spending so if 3" is what you want, 3" it is.

..and Stav, it may be just that people are looking at your car perhaps not as an 'enthusiast', but someone wondering what the hell is making all that racket...

Dsiclamer: I had 3 pints of Mountain Goat for lunch.

[SammyDen]

lots of people look at ugly cars, not because they like it, but because they can't turn away.
loud 6's generally sound horrible.

[JC]

Originally Posted by Damage

Absolutely nothing, but I guess you couldn't work that out.
Just because in theory something shouldn't work it may just do the opposite.

I used the carby size as an example, in theory you shouldn't need a carburetor with a bigger CFM than 575.5 with an optimistic 100% volumetric efficiency at 6500rpm, but Joe Sherman proved different, it could be the same thing with the 3" exhaust vs 2.5". But with your smart remarks I am sure you understand this, or do you need a cardboard book with bright coloured pictures to be included.

Cardboard book with pictures would help - and if you can find one that proves that a 3" on a 4.0 is better than a 2.5", then please post up a link.

Just because someone proved something different works for one kind of anything does not mean that everything else different works every time for everything - if that were the case, we'd all be driving to Mars.

[The Monty]

I was reccomended 3 inch by a sponsor of this forum. Also JMM, who obviously know nothing about NA6's (yeah, sarcasm intended), are supposed to be releasing a 3 inch option on the DEV3 kits for the B series cars.
I posted hard fact. I ran 15.37, backed up, with 2.5 inch, and 14.9 three times in one night with 3 inch. How can you people sit there and debate it.

IT WORRKKSS,,, NO CRAP EINSTIENSSS!!!

[The Monty]

With three inch ^^^^^





With 2.5 inch ^^^^^

[The Monty]

http://www.fordforums.com.au/showthread.php?t=42103

And there is 7 pages of bickering on the same subject. People who dont have 3 inch, argue it doesnt work, EVERY SINGLE PERSON that has 3 inch, or bigger for that matter, says it was a good move.

[The Monty]

http://autospeed.com/cms/A_2319/article.html

Article on DEV kits on the BA outlining 3 inch exhausts.
And yes I do realise that I said DEV 3 kits before, I dekcuf up.

[The Monty]

Plus if anyone wants to say anything bout what mods I had at either of those two drag nights, ask Blackers10, XTC, Dazzler, or FS5, they all know what I had on both of those times.

[Stav]

If anything,the 3 inch cat is to restrictive. I am going to see if I can fit a 4 or 5 inch cat.I had the car turning both wheels off the mark.Maybe the tune needs adjusting. The extra performance was from a 2.5 inch with a leaky cat to a 3 inch with a leaky cat. There was a big performance increase.This says leaky cat or not the gains are there to be had.The car stll feels much quicker than the 2.5 incher. So whoever doesnt back the 3inch just hasnt really done enough work on them.

[Stav]

Originally Posted by Death351

So now it's been confirmed the leak was the source of 'extra performance', is the 3" really that much better over the 2.5" on your wagon?

I just find it amusing when people debate 'fact' with experts like someone from HM Headers who have designed and fitted hundreds, nee thousands of headers/exhausts to cars, but because someone fits one exhaust to their car they know better. Neither Chris Bluepower or Rob Herrod who worked on my car suggested going 3" was going to make more power and was worth the $$. In the end, it's your own $$ you're spending so if 3" is what you want, 3" it is.

..and Stav, it may be just that people are looking at your car perhaps not as an 'enthusiast', but someone wondering what the hell is making all that racket...

Dsiclamer: I had 3 pints of Mountain Goat for lunch.

I might just go to the track one of these days and see if theres any difference. Mountain goat sounds like good stuff too mate.The truth is in the real results.Me I am happier because the dam leak was blowing my eardrums out. Some people say harden the f up but I wont look that hardcore if someone abuses me and I have to hold my hand to my ear and scream out ..' WHAT WAS THAT SONNY" because I cant hear..heheh