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displaying posts 1 to 24 of 24
| Author | Subject: New exhaust! First test fit |
 devere
Senior User  Location: Saxtead Registered: 16 Dec 2008 Posts: 810 Status: Offline |
Post #1
Well, after my latest excursion into a ditch, the exhaust finally got too bent! Had taken a beating for a while now so this made me decide to finally sort a new one! Here ar the pics of my first fitting. Not bad for a bit of cutting, and loosely fitting it on i thought... Obviousy clamps will be put at more suitable angle when finally fixed!     |
 Posted 16th Jul 2011 at 23:16
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smithers
Seasoned Pro  Location: Glasgow Registered: 22 Nov 2004 Posts: 1,016 Status: Offline |
Post #2
Is that just a straight pipe from the exhaust manifold?  Surely you will loose a lot of power with that and crate a lot of noise. ________________________________________ 1997 Black GTi6smithers205 at hotmail.com |
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Posted 16th Jul 2011 at 23:35
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devere
Senior User Location: Saxtead Registered: 16 Dec 2008 Posts: 810 Status: Offline |
Post #3
Its just straight pipe for now yes, a friend in Belgium has a genuine group A backbox lying around, so willhopefully have that ff him a some point soon! And at the moment it should be within the noise regs! |
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Posted 16th Jul 2011 at 23:39
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dangti6
aka JKshooter  Location: Taunton, Somerset Registered: 15 Jun 2006 Posts: 10,305 Status: Offline |
Post #4
Back pressure didn't get a look in.Those Arcan jacks are good. ________________________________________  |
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Posted 16th Jul 2011 at 23:41
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bukosgti6
Regular  Location: leicester Registered: 14 Jun 2010 Posts: 170 Status: Offline |
Post #5
i doubt that would be in the noise limit |
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Posted 16th Jul 2011 at 23:42
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devere
Senior User Location: Saxtead Registered: 16 Dec 2008 Posts: 810 Status: Offline |
Post #6
bukosgti6 wrote: i doubt that would be in the noise limit depends what the noise limit is.... |
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Posted 16th Jul 2011 at 23:45
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gilesy
Seasoned Pro  Location: Greenwich - in that London Registered: 03 Apr 2006 Posts: 5,133 Status: Offline |
Post #7
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Posted 16th Jul 2011 at 23:47
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owain
Seasoned Pro  Location: Essex Registered: 20 May 2009 Posts: 9,185 Status: Offline |
Post #8
No power or eardrums ftw!Seriously, just buy a proper one  ________________________________________ Membership expiring soon, get in contact on our new little forum project. |
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Posted 17th Jul 2011 at 17:46
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mattgti6phase2
Seasoned Pro  Location: inside my 6 abusing the tarmac!! Registered: 16 Jul 2010 Posts: 2,371 Status: Offline |
Post #9
You will now have about 3bhp! People will hear you a million miles away and it will sound like your going fast until you roll by at 30mph. Should have put that on a corsa  ________________________________________ Team Nile 6 Team: 40.2 MPG  5 x a 306 owner! currently abusing type r's in a town near you ™  I truely live for the 306 ® Build date: 29th October 1997 Wednesday's car midweek madness  |
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Posted 17th Jul 2011 at 23:53
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lewisdmz
Senior User Location: plymouth Registered: 25 Jul 2009 Posts: 504 Status: Offline |
Post #10
Get a vid up of the sound hehe. |
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Posted 18th Jul 2011 at 00:04
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devere
Senior User Location: Saxtead Registered: 16 Dec 2008 Posts: 810 Status: Offline |
Post #11
mattgti6phase2 wrote: You will now have about 3bhp! People will hear you a million miles away and it will sound like your going fast until you roll by at 30mph. Should have put that on a corsa So my 1.4 Pug wont be going super fast then? |
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Posted 18th Jul 2011 at 00:26
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mattgti6phase2
Seasoned Pro Location: inside my 6 abusing the tarmac!! Registered: 16 Jul 2010 Posts: 2,371 Status: Offline |
Post #12
quote: So my 1.4 Pug wont be going super fast then?  First rule of removing silencers and cats is to reduce the bore to make up for the loss in back pressure. I run a full stainless manifold back on my 6 with no cat 1 mid silencer which is pretty big and a rear silencer which is also pretty big. I had my bore reduced from the standard 2.5 inch bore to a 2.25 inch bore to compensate. You have to remember straight through boxes and or no boxes in your case allow the exhaust gases to escape alot quicker but without back pressure your losing soooo much power. Increasing bore sizes to gain power only works on engines with forced induction. ________________________________________ Team Nile 6Team: 40.2 MPG 5 x a 306 owner! currently abusing type r's in a town near you ™ I truely live for the 306 ® Build date: 29th October 1997 Wednesday's car midweek madness |
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Posted 18th Jul 2011 at 01:14
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kit
Seasoned Pro  Location: Location: Location: Registered: 22 Jan 2009 Posts: 2,394 Status: Offline |
Post #13
That is going to sound and perform shit.________________________________________ Racing driver, fighter pilot, astronaut, compulsive liar. |
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Posted 18th Jul 2011 at 01:30
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buzzbrightyear
Seasoned Pro  Location: hiding all receipts for car Registered: 09 Jul 2008 Posts: 11,901 Status: Offline |
Post #14
Shame cos it looksLike You went to Some effort. ________________________________________ andrew315rawson@live.co.ukMoonstone phase 7 gti6 My Project thread: http://www.306gti6.com/forum/showthread.php?id=119992&page=1 |
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Posted 18th Jul 2011 at 04:51
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owain
Seasoned Pro Location: Essex Registered: 20 May 2009 Posts: 9,185 Status: Offline |
Post #15
buzzbrightyear wrote: Shame cos it looks Like You went to Some effort. It sure does. ________________________________________ Membership expiring soon, get in contact on our new little forum project. |
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Posted 18th Jul 2011 at 12:56
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sharvey44
Senior User  Location: East London Registered: 22 Feb 2010 Posts: 795 Status: Offline |
Post #16
owain wrote: buzzbrightyear wrote: Shame cos it looks Like You went to Some effort. It sure does. Scaffold Pole Exhaust Nice Touch ________________________________________ Ph2.5 Nile - Slowly trying to de-East London it and restore to former glory...Built on the 9 Febuary 1999 - Tuesday's car..is full of pace? Currently looking slightly molested due to some c*nt trying to get into it..  According to the forum Social Worker, because I work in IT, I am socially retarted.. |
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Posted 18th Jul 2011 at 16:34
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daveyboy
aka Jim Davey  Location: Southampton Registered: 01 Oct 2007 Posts: 8,648 Status: Offline |
Post #17
Stick with it, once the backbox is on it I'm sure it will be a cracking system, no resonator box on it might make it a tad harsh to live with though ________________________________________ R H Davey Welding Supplies. I sell new and used welding equipment in the Hampshire area. I take on welding jobs in the evenings, ally casting repairs are one of my specialities but I can weld pretty much anything. PM me with your requirements.Some of my services: (See my for sale threads) Engine mount/chassis repair Solid Beam Mounts BACK IN PRODUCTION Harness bars |
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Posted 18th Jul 2011 at 20:50
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phillipm
Seasoned Pro  Location: Rotherham Registered: 15 Oct 2006 Posts: 20,607 Status: Offline |
Post #18
^^What he said.I'd stick a resonator on though. ________________________________________ - Bespoke rollcages/additions/adjustments. Half cages right up to complete custom spaceframes - MSA/FIA spec, CDS, ROPT, T45, etc - PM meEmail me! Custom-made polybushes available - need an odd size or fitment? - anything from batch work to one-off pieces. |
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Posted 18th Jul 2011 at 20:58
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buzzbrightyear
Seasoned Pro Location: hiding all receipts for car Registered: 09 Jul 2008 Posts: 11,901 Status: Offline |
Post #19
sharvey44 wrote: owain wrote: buzzbrightyear wrote: Shame cos it looks Like You went to Some effort. It sure does. Scaffold Pole Exhaust Nice Touch That Happens A Lot When Using Internet From I Phone ________________________________________ andrew315rawson@live.co.ukMoonstone phase 7 gti6 My Project thread: http://www.306gti6.com/forum/showthread.php?id=119992&page=1 |
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Posted 19th Jul 2011 at 04:06
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welshpug!
Capt Pedantic  Location: Bigend, Wales. Registered: 27 Mar 2007 Posts: 25,838 Status: Offline |
Post #20
he's just doing it to fit in with the other Belgians ________________________________________ need a part number? get on here - http://public.servicebox.peugeot.comBring on the Trumpets. |
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Posted 19th Jul 2011 at 15:37
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dragoon
Seasoned Pro  Location: Ghent - Belgium Registered: 30 Dec 2008 Posts: 1,071 Status: Offline |
Post #21
Oi!On the other hand, I drive mine daily with only a Devil backbox, so it's doable  Very loud and sharp sound, way over noise regs too! Definitely a loss in torque, meaning you'll have to rev the shit out of it. Who's the Belgian guy you know if I may ask? ________________________________________ Team WheelwhoreTeam Limited Edition Astor 306 Francorchamps RIP Virtual Blue 208 GTi quote: I  this place. So many illiterate deluded fool's acting 'ard . . . and so many literate intelligent people to rip them apart and knock them back down again . . . ahh  |
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Posted 19th Jul 2011 at 23:34
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devere
Senior User Location: Saxtead Registered: 16 Dec 2008 Posts: 810 Status: Offline |
Post #22
So by adding a silencer its going to make huge gains is it? I think if i can aim somewhere in the region of 0.2psi or below of back pressure, then that will be sufficient! Anything over that is likely to produce a minimal loss of power, depending on just how much of it there is.It is exhaust gas velocity that is the difference between making power or not, if i used a 5 inch bore system, id end up with the gas just hanging round! Im pretty sure its going to be moving along at a fair rate of flow as it is. As for the time taken, that took me less than an hour putting that together, was only 3 cuts to make, then slot it all together. |
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Posted 20th Jul 2011 at 00:45
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ruan
Junior User  Location: Truro Registered: 17 Sep 2009 Posts: 64 Status: Offline |
Post #23
It won't make a dent in top end power I'd doubt... Backpressure is there to help low down torque, due to valve overlap at low RPMs, most of the mixture gets blown out the exhaust, backpressure is there to help keep the pressure up in the exhaust, so it doesn't blow as much out at lower RPMs, thereby increasing torque. When you're "on cam" - that's where the inertia of the air filling the cylinders enables the cylinders to fill a wee bit more than would normally be possible... Obviously your loss of velocity will prevent as good scavenging from the cylinders, but I doubt it'll impact enough to counter the gains at high RPMs from the lack of backpressure leaving exhaust gasses in the cylinder. This is how I've always understood it. Amirite? |
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Posted 8th Sep 2011 at 17:47
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jägertom
Newbie  Location: Throwing parts at a hungry Pug Registered: 10 Mar 2010 Posts: 43 Status: Offline |
Post #24
Yes, to a certain degree, but as with most things to with the complexities of IC engines - there's more to it than can realistically be explained in a forum post, and there will always be those you believe you need backpressure for torque and other such things such as overheating ex' valves. (And to a certain extent they're right, it can affect drivability)Speaking in general, the exhaust manifold ("banana bunch" ) geometry affects your scavenging effect the most, whereas your exhaust's main tube geometry has most effect on the backpressure produced by the system as a whole. One of the important things to remember about backpressure is that really, there's no constant pressure - just pulses blasting around the manifold from the other cylinders, it's a load of spikes. The idea is to tune your exhaust so that these pressure spikes (and corresponding pressure dips ) help to a) suck the dead-volume exhaust out of the next exhausting cylinder, and b ) help draw in the fresh charge. Also if you've got a turbo, you can funnel these pulses in pairs to the turbine wheel, which gives better performance. Google 'twin scroll turbo' images to see manifolds which pair cylinder pulses and feed them to the turbo. Once you start looking for maximum power, you want your banana bunch you give you a nice scavenge effect at your target power band (when you're "on-cam" ), and then you want as little back pressure as possible after that so you have as little tube length as you can get away with. The engine releases a certain amount of energy from the fuel. The less of this energy you use trying to push gas down tubes, the more makes it to the road. Take a look at an F1 exhaust. Banana bunch to atmosphere, cos all they care about is maximum power, drivability comes a close second. Been designing engines for Cummins for the past year btw Edit: To get rid of accidental smileys! ________________________________________ Feelin so fly like a Gti6 Team >160,000mi |
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Posted 10th Sep 2011 at 16:32
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