Sound Generator Modification

Hi guys, as a newbie I have to ask the silly question, does this mod do any damage to the engine as I assume the air fuel mixture is changed? :|
 
richie.b said:
Hi guys, as a newbie I have to ask the silly question, does this mod do any damage to the engine as I assume the air fuel mixture is changed? :|
Click to expand...

No damage at all, air fuel mixture stays the same :thumbsup:


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I did this a couple of days ago and couldn't believe how much difference it made! :D Taking a work colleague out today to show him the difference, he's had his Zed over a year and had never heard about it so he's in for a treat!! :evil:
 
Just taken the peice of foam out closest to the engine bay. It's quite a thick price isn't it.
Did mod within 30, that includes opening and closing bonnet. Will see how it sounds going to work later
 
Just did this myself a couple of hours ago, loving the noise but may put one of the pieces back depending on if I can live with it permanently.

Could someone explain how this works please? The whole part I mean. And imagine you're explaining it to an idiot! And what would happen if you left the tube out completely?

Thanks in advance, and thanks for the original "how to" guide.
 
Hello,

I must be too dumb but I tried this mod and failed.

I was able to do step #1 and #2... and was expecting to be able to take out the foam of that end without much trouble and then plug it back in since it's the only foam I want to remove but it's too crammed and not that flexible, looks like it's impossible to do so after all.. I don't know how some people state they've been able to do just that?

Anyhow, I carried on and wanted to try step #3 and then wow.. my car didn't look like the photo... I have another kind of plastic cover that retains the sound generator to the engine block and is fixed with tork screw thingies...

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I haven't been able to remove it and do the mod :(

any help?

I thought about removing only the flexible bit (go straight to step 6) but since it's so squeezed in there I fear I won't be able to put it back together...
 
After step 2 I just used a little force to position the pipe so I could get some long nosed pliers up the pipe and pull out the foam.
Perhaps you are being a bit too gentle with it. I only pulled off the one end and removed the one piece of foam.
 
Maybe I was being too gentle but I couldn't find a place with enough place to do so, there's a lot of other stuff in the way... Do you remember which way you bent it?
 
Just been out to the car to have a look.
Pulled it out and turned it at right angles towards the wing.
Not being funny but are you taking the right pipe off?
It's not the ridged pipe in your photo. It's very low down approx. behind the glove box.
Too dark to photo at the moment but will do tomorrow if no luck.
 
Well I do think I'M taking the right one out as it really comes out of airbox and goes into the firewall... But you're welcome to take a photo
 
Rich-hill said:
Did mod within 30, that includes opening and closing bonnet.
Click to expand...


30 minutes is a long time, do you have a problem with the bonnet?
 
It's the bit of pipe right above the red one on the right of your photo and you need to pull it off the bulkhead as said above - if there is no foam in the end someone else has taken it out. The second piece is at the other end, and you need to undo the jubilee clip on the right handside of the mounting attached to the engine. For the love of god don't undo and remove the pipe on the left of that mounting as you will have to take the whole sound generator out (including taking the mounting off the engine) to get it back on - I know, I took it off last night when doing something else :oops:
 
Ok well that's what I was trying to do, I'll try again when it gets warmer maybe the plastic will cooperate more and my hands will have more grip

ThAnks!
 
Done this took couple minutes and what a difference in sound! So tell me how does the car sound with an induction kit on?!!
 
hype said:
Just did this myself a couple of hours ago, loving the noise but may put one of the pieces back depending on if I can live with it permanently.

Could someone explain how this works please? The whole part I mean. And imagine you're explaining it to an idiot! And what would happen if you left the tube out completely?

Thanks in advance, and thanks for the original "how to" guide.
Click to expand...

As far as I can figure out - and I am no engineer, but I had all this apart the other day doing something else - the induction tube has a couple of resonating chambers on it, one at the front under it, and one larger one clearly visible in the pics above. They are shaped, and I guess designed to reflect certain frequencies of sound from the engine as the throttle body opens (which it's attached to), and transmit them down the tube. I haven't seen inside one of the chambers, so I don't know if there are flaps that move to accentuate the sound under acceleration - but, mine is not really noisy until I get over 3,000 revs and am pushing it hard, and you wouldn't want to have bits of pastic flying loose in there which is what makes me think the shape is 'tuned' to a certain frequency.

I think if you took the end tube off completely then you would lose a lt of noise from the cabin, but the engine would be noisier outside ? Not sure if that would affect the efficiency of th inlet into the engine though.

Sars might have a better answer if she reads this...
 
Thanks Bing, that kind of what I thought, and I'd be intrigued to see how it sounded with the tube removed, but would we wary of causing any damage.
 
Bing's analysis is spot on. My understanding is there are resonating diaphragms at both ends of the tube. Removing the tube would move the sound from the cabin to under the bonnet, though may not work quite as well as the firewall diaphragm is taken out of play, and even the tube may be part of the resonant design. Removing the tube wouldn't cause any damage to anything.

BUT IF I'M WRONG. :!: If there is no diaphragm between the tube and rear resonator, the engine could draw unfiltered atmospheric air through this opening and cause nasty bits to be drawn into the engine! But if this were the case, you should notice a giant sucking sound in addition to your 'improved' intake sound.
 
Finally had a go at it this morning, and wow oh wow!! :thumbsup:

Never expected it to sound this good. I was ever so disappointed that the 3-litre wasn't a tad more aural, no problems now! I removed the piece closest to the cabin, didn't even need a screw driver. Just pull the pipe out of the firewall, and pull out the foam with your fingers.

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