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Straight Through Exhaust...; opinions?
Topic Started: Wed Jan 9, 2008 2:47 pm (1,194 Views)
CrysAk
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Moar Bass!
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hey guys, anyone fit a straight through system on there 16v? if so, would you recommend, what they sound like compared to one with centre boxes etc...

thinking about fitting one to mine in a few months, will be heavily sound deadend on the cabin so shouldn't be too much of a headache. (for me at least)

will it sounds good (DTM good) or crap (banger racing crap)
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dave_irl
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I reckon it would sound good but be quite loud, TBH I would do it for performance reasons rather than just the sound, and a heavily sound deadened cabin would add a few kg's that could offset any slight performance gain by a free flowing exhaust!

That said, letting the exhaust flow more freely does wonders for the responsiveness, i.e. how the revs rise and fall, my old exhaust was rubbish and Im sure the 16yr old cat-converter was clogged to bits, after the new exhaust and decat, 5th gear actually became useable rather than just an overdrive cruising gear, noticeable improvement in acceleration at the top end..

Just some thoughts :) I still say go for it though :D
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CrysAk
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Moar Bass!
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haha, yea ill be doing the sound deadening for audio install reasons so any performance gain i can get to make up for it would be ideal :P
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cossie connoisseur
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there can be only one ;-)
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straight through like scafolding is crap and you will loose power, do it properly!

you can get a custom one for a couple of hundred
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CrysAk
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Moar Bass!
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cossie connoisseur
Jan 9 2008, 02:15 PM
straight through like scafolding is crap and you will loose power, do it properly!

you can get a custom one for a couple of hundred

will be getting it done properly via kingwinford tyres like i did (and many members including everyone in this thread so far has lol)

surely the resonators cause some airflow restriction?
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stwat
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You NEED a certain amount of back pressure in the system for the engine to run properly.

Many moons ago my brother took all the boxes out from his mini and the car ran like a bag of sh!te with no power at all unless it was at the top of the rev range!!!

I have been looking into removing the back box on my range rover to help with ground clearance(the back boxes on rangies stick out way to much and get caught all the time when off road) and have been told to ONLY remove the back box as removing all the boxes causes the problem i have stated above. No back pressure= no low and mid range power!!!
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cossie connoisseur
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there can be only one ;-)
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yeah they are fine, i used them myself :P

when you said 'straight through' sounded like one piece of pipe all the way through.

Kingwinford tyres put 3 silencers on the 16v that tone it down but also provide the right back pressure to stop power drop off.

Although its a tube with holes instead of a propper filter the stainless system provides pleanty of resenance reduction which stops you going deaf :)
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CrysAk
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Moar Bass!
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ahh, i heard about back pressure a little before, didnt realise how much of a crucial roll it played.

how do they work that out at kingwinford tyres? or is it the same for pretty much any car?
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dave_irl
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CrysAk
Jan 9 2008, 04:20 PM
ahh, i heard about back pressure a little before, didnt realise how much of a crucial roll it played.

how do they work that out at kingwinford tyres? or is it the same for pretty much any car?

There was only two on mine, normal size midbox and small back box, they have various shapes and size boxes that provide less or more flow etc, its not an exact science for them but they can match it nicely to the car.. obviously a 1.4 would not get the same set up as a 2.3 :)

Here is my lower system (manifold not finished yet) - only one large & one small box for max-flow.. its just the right volume (for me) and really let the engine breathe.. The hardcore side of me wanted just two of those small fatcans total, but I knew had to compromise a little for fuel economy and attention from the law!

Look at all that lovely stainless pipe!
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merc190uk
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The Godfather

note

i falled the mot last year because my car was too loud !

down to the mot inspector but the rules are if it sounds to loud for a standard car with a normal exhaust he has the power to fail it.

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dave_irl
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merc190uk
Jan 9 2008, 05:32 PM
note

i falled the mot last year because my car was too loud !

down to the mot inspector but the rules are if it sounds to loud for a standard car with a normal exhaust he has the power to fail it.

Then its out with the angle grinder and in with a short section to be swapped with the 190club communal MOT/NCT cheato-catalytic-converter, to be used when needed! :lol:

My car was tested before I went attacking it, NCT is due february sometime, I'll obviously miss that but I think that'd be the least of my worries :rolleyes: :ph43r: Its not so loud but emissions and the carbs! But when it was tested it was at about 7% of the limit for emissions in its class, so I could just get away with it if she burns cleanly enough..

Did you swap back for the MOT Steve?
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cossie connoisseur
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there can be only one ;-)
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if you go to Kingwinford tyres and tell them you want a OEM equivalent system they will sort you out.

3 silencers on the 16v with a dual pipe system l the way to the back box.

tell them when you book about the discount and it will be £220 inc VAT ;)
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190ian
190ian
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I have a stright through but on my 1.8 with a stright through box in the middle its very loud,its ok if you want to be heard well before you are sceen,sounds great in tunnels, gear change is alot smoother and more responsive but it did sound better when the cat was on in my view but i do get a lot of looks at the moment with the cat off.
It is loud in lower gears from 2k revs upwards but quite in 5th at 70mph
It is costom made all wealded together no clamps.
hope this is some help for you
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dave_irl
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^ Nice one, a little exhaust modification really lets the 1.8 breath doesnt it :)

PS Im with you on tunnels, cant resist window open, down to third, give her the boot :lol:
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frank133
frank133
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Hi I dont think back pressure is a problem,I just kept the front box connected to the downpipes,after that I just bolted on what I had ,the middle box I used a cherrybomb[straigt through silencer]and the back box was a 3" bore off a Suberu,
sounded pretty cool ,no trouble with the mot .acceleration was better and fuel.
I then changed the centre box for a standard one,and put a twin outlet back box on
to stop the missus moaning.The engine does seam to breath a bit better with the bigger bore twin back box,or is it just wishfull thinking. B)
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shrekky
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Troll hunter
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CrysAk
Jan 9 2008, 04:20 PM
ahh, i heard about back pressure a little before, didnt realise how much of a crucial roll it played.

how do they work that out at kingwinford tyres? or is it the same for pretty much any car?

you need a little back pressure on the lower revs,or it will just be flat..................a straight through unrestricted exhaust would only be beneficial if you were spending most of the time at the top of the rev range at full throttle.......................and it is pretty much the same for all cars.


a slighter bigger bore and maybe dropping to 2 boxes will be well enough for the engine to breath given the fuel system you have ;)
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