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3" exhaust with good mufflers 

 

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 Post subject: Re: 3" exhaust with good mufflers
Posted: Sat Oct 01, 2011 6:42 pm 
Getting Side Ways
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cozza88 wrote:
2.5" is good for about 400-500hp non blown but on a na6 3" could be good, pressbent is crapp mandrel bends are good, but i wouldnt waste the mney on a varex muffler they are just a wast of money, go a good old lukey or a walker (same company different stamp), ive got a 2.5" lukey from extractors to tail pipe all mandrel bent, and it goes good, it's not too loud but not too quiet it had a nice sound but doesnt drone through the car all the time,


Very informative post right here... :|

 

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EVL098 wrote:
Cramping in the hand from having it on your Wang for an excessive period of time is a definate con.
Seriously do people google "f**k up modifications for Fords owned by Jews" and get linked straight to this site nowadays?

AU,factory fitted tickford kit/IRS, t5,Sports ryder/KYB: gone.

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 Post subject: Re: 3" exhaust with good mufflers
Posted: Sat Oct 01, 2011 6:47 pm 
Oompa Loompa
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A varex can't be a waste of money if it's going to save you hundreds and hundreds of dollars in epa and civic compliance fines...

At the end of the day, a muffler is a muffler. Obviously full on tricked out custom whatever are an exception, but they're still just another bit of pipe.

But not all mufflers have a remote control butterfly valve..
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 Post subject: Re: 3" exhaust with good mufflers
Posted: Sat Oct 01, 2011 6:53 pm 
Getting Side Ways
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comeherelois wrote:
At the end of the day, a muffler is a muffler. Obviously full on tricked out custom whatever are an exception, but they're still just another bit of pipe.


Ahhh no.

f**k we are really on a roll with good posts today.

 

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EVL098 wrote:
Cramping in the hand from having it on your Wang for an excessive period of time is a definate con.
Seriously do people google "f**k up modifications for Fords owned by Jews" and get linked straight to this site nowadays?

AU,factory fitted tickford kit/IRS, t5,Sports ryder/KYB: gone.

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 Post subject: Re: 3" exhaust with good mufflers
Posted: Mon Oct 03, 2011 7:21 pm 
Getting Side Ways
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cozza88 wrote:
2.5" is good for about 400-500hp non blown


Yeah if you use two of them on a V8 it'll be fine for that power.

Funny thing is I've seen 180hp 4cyl engine step up from a 2inch to a 2.5inch system and pick up power from 3000 rpm through to 7500rpm.
Both systems were mandrel bent and both had lukey mufflers of the same design.

The only way to know is to measure for back pressure across the operating rpm of the engine.

 

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 Post subject: Re: 3" exhaust with good mufflers
Posted: Mon Oct 03, 2011 7:47 pm 
Smokin em up
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I just put a hotdog on my 3inch system last week, because without the cat it wasnt bearable for a street car.
Also had the headers fiddled with. Picked up another 11rwkw.

Image

 

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 Post subject: Re: 3" exhaust with good mufflers
Posted: Mon Oct 03, 2011 8:07 pm 
Stock as a Rock
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i run a twin 2.5 on my n/a :) hehe
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 Post subject: Re: 3" exhaust with good mufflers
Posted: Mon Oct 03, 2011 8:38 pm 
Getting Side Ways
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Trav199 wrote:
i run a twin 2.5 on my n/a :) hehe


DAMN! - based on all the "experts" you should be lucky to make 100Kw :wink: :roll:

 

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 Post subject: Re: 3" exhaust with good mufflers
Posted: Mon Oct 03, 2011 8:44 pm 
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hahaha is making 245rwkw at the moment.. more tuning next wk..
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 Post subject: Re: 3" exhaust with good mufflers
Posted: Tue Oct 04, 2011 7:30 am 
Getting Side Ways
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Greenmachine wrote:
Trav199 wrote:
i run a twin 2.5 on my n/a :) hehe


DAMN! - based on all the "experts" you should be lucky to make 100Kw :wink: :roll:


Whose this aimed at? Have been purposely biting my tongue over your earlier post comparing an oversized exhaust to venting directly to the atmosphere...

 

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EVL098 wrote:
Cramping in the hand from having it on your Wang for an excessive period of time is a definate con.
Seriously do people google "f**k up modifications for Fords owned by Jews" and get linked straight to this site nowadays?

AU,factory fitted tickford kit/IRS, t5,Sports ryder/KYB: gone.

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 Post subject: Re: 3" exhaust with good mufflers
Posted: Tue Oct 04, 2011 10:19 am 
Getting Side Ways
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No that wasn't specifically aimed at you - I just have a general issue with the concept that larger than a certain size is arbitrarily "oversized" - I've had similar experiences to tickford_6 (respect) where certain things that should be true don't actually end up that way - things that should work don't and others that have no business being any good at all work out terrific :shock: Suffice it to say I prefer to be open minded than not :wink:

Also I never compared "oversized" system with venting direct to atmosphere as such (altho the notion that bigger is going to be closer to that than than smaller IS implicit, but it's of course not that simple - it's about what ACTUALLY happens at the ports) - I was illustrating my THEORY of "subflow" by pointing out that flow into a chamber is different to flow thru a pipe (column flow) - an example being ambient atmospere as the ultimate chamber :wink:

 

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 Post subject: Re: 3" exhaust with good mufflers
Posted: Tue Oct 04, 2011 10:40 am 
Getting Side Ways
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Trav 4.0 has already proved the gain of the 3" system, there is no "its too big issue" now..

 

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 Post subject: Re: 3" exhaust with good mufflers
Posted: Tue Oct 04, 2011 11:48 am 
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GeZza200 wrote:
Trav 4.0 has already proved the gain of the 3" system, there is no "its too big issue" now..



Ahh yess 3" isn't to big if you have the right supporting mods.. 3" On standard engine or with just a cai would be over the top.. But if your running cams or more compression well then its no problem
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 Post subject: Re: 3" exhaust with good mufflers
Posted: Tue Oct 04, 2011 12:38 pm 
Getting Side Ways
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GeZza200 wrote:
Trav 4.0 has already proved the gain of the 3" system, there is no "its too big issue" now..


There always will be a too big issue, just like there will always be a too small issue putting a 2.5" system on a worked engine designed to make peak power in the upper RPM.

Most people struggle with getting good results from their modifications because they look at each individual part. As an extreme view: y, you might get an increase in top end power on a stock engine with a 3" system, but overall your car will probably be slower than someone running a 2.5" as it will under perform in a greater proportion of the rpm range where the rest of the engine (heads,cam, intake manifold, maybe headers) was designed to work. The person with the stock engine running 2.5" system has a much more efficient design overall as it will match the flow of a stock engine throughout a greater proportion.

It is like putting a custom intake manifold (which essentially shares same theory as exhaust headers) on a stock engine. You put something with short runners designed with all reflection points around 5000rpm on a stock engine and you will notice an increase in top end (at expense of bottom end). But if you put it on a worked engine with matched heads/cam/exhaust which are most efficient at this point you will notice a much greater increase in top end from the fitting of this individual part.

This is why 90% of people on here shouldn't be fitting a 3" system as even though it will benefit their top end they will end up decreasing overall performance of their car.

 

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EVL098 wrote:
Cramping in the hand from having it on your Wang for an excessive period of time is a definate con.
Seriously do people google "f**k up modifications for Fords owned by Jews" and get linked straight to this site nowadays?

AU,factory fitted tickford kit/IRS, t5,Sports ryder/KYB: gone.

Last edited by skidder on Tue Oct 04, 2011 12:59 pm, edited 1 time in total.

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 Post subject: Re: 3" exhaust with good mufflers
Posted: Tue Oct 04, 2011 12:39 pm 
Getting Side Ways
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Greenmachine wrote:
No that wasn't specifically aimed at you - I just have a general issue with the concept that larger than a certain size is arbitrarily "oversized" - I've had similar experiences to tickford_6 (respect) where certain things that should be true don't actually end up that way - things that should work don't and others that have no business being any good at all work out terrific :shock: Suffice it to say I prefer to be open minded than not :wink:

Also I never compared "oversized" system with venting direct to atmosphere as such (altho the notion that bigger is going to be closer to that than than smaller IS implicit, but it's of course not that simple - it's about what ACTUALLY happens at the ports) - I was illustrating my THEORY of "subflow" by pointing out that flow into a chamber is different to flow thru a pipe (column flow) - an example being ambient atmospere as the ultimate chamber :wink:


Greenmachine wrote:
(I said 3.5 just to shi tstir) - and for no more technical reason than I've experienced how damned FINE a car goes when it's run with the exhaust manifold open to atmosphere - ie. no exhaust system at all - so wanted to see how a fairly huge system would go and sound - pretty much guaranteed it would be better than the factory exhaust and it already hoses down factory AUIII XR6 below 4000rpm with that...


I don't think I have referred to any system being arbitarily oversized? Everything is in relativity; no point putting a 3" system on a stock car where it isn't going to make power in the upper rpm anyway.

I was referring to the above comment where it seemed like you were comparing flow in a column (as you pointed out) with flow into a chamber.

Willing to be proven wrong, but I don't think you will get an N/A i6 to flow enough to give a noticeable gain with a 3.5" over a 3". If you did would be a pig to drive on the street.

 

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EVL098 wrote:
Cramping in the hand from having it on your Wang for an excessive period of time is a definate con.
Seriously do people google "f**k up modifications for Fords owned by Jews" and get linked straight to this site nowadays?

AU,factory fitted tickford kit/IRS, t5,Sports ryder/KYB: gone.

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 Post subject: Re: 3" exhaust with good mufflers
Posted: Tue Oct 04, 2011 12:57 pm 
Getting Side Ways
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Ride: 98 EL Futura

Power: 199 rwkw

Location: Lilydale
VIC, Australia

I was referring to my car about the 3" not being to big

 

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EL Futura: CVE head, Wolf V500, ICE Ignition and Coil, 36lb injectors, Walbro 255lb, Paci comps, 3" exhaust, T5, Harrop Truetrac with 3.9s. Now with 198.9rwkw, (~185rwkw and 13.80 @99.1mph) with more power to come

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