PECO exhaust noise

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Postby GeoffSmith » Fri 01.02.2008, 22:53

MattDon wrote:although i did get the dredded boost creep at around 80 in third, which was interesting.


How's the forehead? :-D
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Postby MattDon » Fri 01.02.2008, 23:16

lol i thought you were exadurating when you said that but its not far from the truth. i guess that what happens when you go from 170bhp+ to 0 in a fraction of a second :shock:
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Postby MattDon » Tue 05.02.2008, 04:33

as promised, dont think it does the peco justice to be honest

standard exhaust - little leaky

peco fitted less that 100 mile ago
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Postby Galsia » Wed 06.02.2008, 19:21

That sounds pretty good. I'm gonna have to pick one of those up I think. Any noticeable increase in horsepower?
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Postby Galsia » Wed 06.02.2008, 19:23

Double post. :(
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Postby MattDon » Wed 06.02.2008, 19:37

yep it does pick up better, no idea on figures but you can feel the difference. the video realy doesnt do it justice, im trying to workout how to record it while moving, :-D

only down side is the turbo creep (which doesnt happen to everyone), which has to be said its a bit bloody scary, so remember the wastegate will need boring out by around 4mm, if you get the problem.
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Postby Galsia » Wed 06.02.2008, 19:53

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Postby MattDon » Wed 06.02.2008, 20:03

im not sure of the technicalities, but for some reason the boost levels raises beyond the norm and the fuel cuts off to protect the engine, so esentialy boost creep involves a sudden and complete loss of power, thats explains the comments about foreheads above. its temporary but scary and dangerous. if you can drive sencibley its wont happen, but if you have a heavy right foot and you proberly will after fitting the peco :-D then its a major pain and needs to be sorted asap.
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Postby Galsia » Wed 06.02.2008, 20:13

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Postby MattDon » Wed 06.02.2008, 20:19

proberly, porting the wastegate is quite easy, but removing the turbo can be a problem, read this to let you know what your getting intowastegate porting thread

did you find out why it was doing it? id get that checked out if i were you. is your car modified at all?
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Postby Galsia » Wed 06.02.2008, 21:14

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Postby MattDon » Wed 06.02.2008, 21:51

what boost is showing on your gauge? also ive done a little reading and it looks like an mbc is normaly fitted with the superchip, if it were me id get rid of both and if i missed the power buy esm's chip. another thought is it couldve been your wastegate sticking, which has been well covered in other threads "wastegate wiggle" comes to mind. im hoping someone with more knowledge comes along soon and either corrects or confirms what ive said.... :)
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Postby GeoffSmith » Wed 06.02.2008, 22:53

MattDon wrote:what boost is showing on your gauge? also ive done a little reading and it looks like an mbc is normaly fitted with the superchip, if it were me id get rid of both and if i missed the power buy esm's chip. another thought is it couldve been your wastegate sticking, which has been well covered in other threads "wastegate wiggle" comes to mind. im hoping someone with more knowledge comes along soon and either corrects or confirms what ive said.... :)


Correct.

Look for an MBC as shown in the Wiki.

The 'Super'chip upgrade (several hundred pounds I believe) merely overrides the overboost protection designed into the ECU; this is a safety measure that cuts off the fuel and is designed to save the engine if you get a sensor failure or wastegate stuck shut. The latter happened to me (before I knew I had an MBC) and from off-scale boost gauge and smoke I left in my wake, there was a few extra horses being put down. :evil:

The engine is a strong unit, but you will running leaner than normal with an MBC and Paul Watkins has suffered piston meltdown, so I decided to ditch the very expensive agricultural plumbing and go with the Everest which correctly gauges the air/fuel ratio and retains the safety of the fuel cutoff.
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Postby rip » Wed 06.02.2008, 23:55

Galsia wrote:
MattDon wrote:proberly, porting the wastegate is quite easy, but removing the turbo can be a problem, read this to let you know what your getting intowastegate porting thread

did you find out why it was doing it? id get that checked out if i were you. is your car modified at all?


I found a superchips leaflet (but no bill) in my service history folder and I've noticed that a previous owner has opened the ECU, so I'm assuming one has been fitted.


Elanscan will give you the data to indentify this.
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Postby rip » Thu 07.02.2008, 00:08

MattDon wrote:im not sure of the technicalities, but for some reason the boost levels raises beyond the norm and the fuel cuts off to protect the engine,


The wastegate allows exhaust to bypass the turbo. At low revs, the turbo just gets in the way, so exhaust is directed through the wastegate. At higher revs, there is too much exhaust gas for the turbo to cope with safely, so the wastegate re-opens to control it. With a large bore exhaust, the flow can increase until the wastegate can no longer cope with the excess, so it goes through the turbo (overboost). The boost gets so high that the fuel system cannot keep up, so it shuts itself down... dramatically.

Porting the wastegate increases its capacity, so it can cope with the higher gas flow, keeping the turbo under control.

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Postby MattDon » Thu 07.02.2008, 01:46

thanks rip very informative. :D
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Postby rip » Thu 07.02.2008, 14:07

No problem.

I am going to put my money where my mouth is next week, and port my own wastegate while the cylinder head is off.

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Postby AndyH » Thu 07.02.2008, 15:31

I will also be starting this tomorrow afternoon. I suspect I will not be finished by the afternoon is out!... I think there may be pics of this already but I'll take some step-by-step ones anyway if all goes to plan :smt023
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Postby Galsia » Wed 02.04.2008, 20:20

Sorry to drag up ths thread up again but I can't help wondering how the Peco exhaust sounds from outside the car at full-whack. I was hoping to hear some at Donny but it didn't happen.

I feel like I'm going back and forth like True Blue... :roll:

I want an exhaust that sounds more aggressive, not just bassier. I want something like this:

http://www.youtube.com/watch?v=9IlW-trWG84

I know nothing about exhausts but I have a feeling that this isn't possible.

I'm not slagging off the Peco because it sounds infinately better than mine at the moment I'm just curious. :lol:
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Postby Gazza » Wed 02.04.2008, 23:10

Haywood and Scott (Basildon) will do you a nice 2.5" exhaust for about £650. You can't get much better than them apparently.

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