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Discussion in 'VE Holden Commodore (2006 - 2013)' started by hanson1128, Nov 20, 2013.
Used -> http://www.youtube-mp3.org/
Got one on the same stretch before the quarter pipes were added
Under cruise conditions the AFM is active, measured from the boot space here is 100 kilometres per hour sound, and 110 kilometres per hour sound.
I'm guessing apple format? Got anything in a normal format?
Are these test tones? If not, xforce is even more crap that I imagined even possible (i am assuming your pulling my chain on these files... they sound like test tones)
In reality the sound level is almost imperceivable with proper sound deadening, as per myriad cabin video posts and sound spectrum graphs and threads I've bored most people with on the matter, with Helmholtz and industrial soundproofing the V8 drone is eliminated and the AFM drone so low that you can't pick it up in the cabin over other NVH.
Suits me fine :yarr:
Looks like a test tone ????
Hi Everyone - first time poster so I apologise if I ask anything thats already been covered in detail in the thread before, but I have read it end to end and I really would love some help.
I've just started toying around with my VE SSV (Series II - MY12, Sedan, Auto - L77) and had a full stainless 3 inch cat back system fitted last Thursday (AFM turned off in the tune for now). It got its first decent run over the weekend, and the drone @ ~1800 rpm in sixth (basically 120 on the freeway especially on a slight incline) is uncomfortable and really sours the whole experience. The system is apparently out of HPX(?) in Dandenong according to the shop that fitted it and tuned it.
Overall I am happy with the sound, and the work done to the ECU etc, and the new exhaust has definitely improved the response and 'fun factor' although it does drone to a lesser extent in other gears (at slightly lower revs in 5th, lower again in 4th and so on down to ~1500-1600 in 1st) but its not as loud and usually short lived as around town (Sydney) I'm accelerating/decelerating a lot.
I have a few questions that I was hoping you guys could help me with
1) Will the headers I was hoping to have fitted last week (4 into 1, 1 7/8th with 200 cell euro approved cats - not installed yet because I couldnt leave the car long enough with the workshop), but which have to wait till later this week help reduce the drone at all? A little worried it could exacerbate the situation.
2) Would a Helmhotlz Chamber setup be able to smooth out the drone if I go ahead and have the headers and cats mentioned fitted?
3) Whats the best way to record the sound without professional gear (I have access to Apple, Android or Windows phones or I can use a laptop) to work out what frequency I need to have some Helmholtz pipes made up and added to the system to overcome - or recommend someone or a shop in Sydney that could sort it out for me?
Look forward to any suggestions (well the helpful ones at least ) - thanks in advance for anything that can help me retain my last shreds of sanity (and get the not terribly happy Mrs off my back about the drone).
Others will know more than me But this is my story. I had an x-force 2.5 inch cat back. It droned at bit at certain revs but not too bad. After getting it tuned and AFM turned off and an KPM OTR fitting the drone seems gone. As I said it wasn't too bad but now not noticeable and vibration from dropping back to 4 cyls has gone. 3 inch is more likely to drone that 2.5 I think.
1. No they won't.
2. Yes they will.
3. Probably an Apple App will do it - check with Pirate to see what he uses; and
DG pipes from rapid exhaust in the Gong make straight through 3 inch helm holtz pipes instead of rear cans but you're going to be loud and illegal with those.
Thanks revster and SnowDoggyDogg for sharing your input and experiences
Glad to hear the headers won't make things worse!
The hunt for some legal Helmholtz pipes begins - I really don't want the car any louder - I'm already at the limits of getting busted by the most severe law enforcement agency of all - the Minister for War and Finance (the missus)
Err your first question I read as will the new cats and headers help make the drone go away?
No they won't.
Will they make it worse though is what your really wanting to know... To that I don't think you'll know until you put them on.
My first question was terribly worded - basically the answer to two is enough for me to not lose anymore sleep. If the drone can be lessened or removed regardless of the headers going on I am happy
Just as a matter of interest the person fitting the headers said it might lessen the drone as it will 'chop up' the airflow somewhat causing a more beat-y noise in the system (but this was after I had already asked to have them and before I had the drone so it wasn't a sales pitch).
Anyone have a recommendation on a good exhaust shop to talk to and get some helmholtz pipes fitted in Sydney (Western (Parramatta, Blacktown, Penrith areas) or Northern Sydney (Along the Pacific Highway) preferably).
I'll see if I can find some good apps to record this noise and try to find somewhere in Sydney I can safely and legally get it to happen in sixth gear.
Mate talk to (the Greek Manager forgot his name at) Midas at Chatswood, he made the ones I used to perfect result and recently sold them onto SnowDogg. All you need is to give (Spiros?) one calculated length and he will bend some 2" capped stainless to fit into your existing pipe axle back, for about $300 for a pair fitted, welded, tacked and neatly hidden between bumper and spare wheel well.
There are pics and dimensions in this thread, just use Analyser on iphone as per this thread to isolate the offending drone zone whilst driving. Then using the formula here also calculate the length in inches for the muffler dude, cinchy.
Else... Greg is the owner at SureFlow in Ingleburn, Sydney, and he has started to incorporate Helmholtz into his commercial offerings.
Else... Forget the pipes and get fully blown bi-modal mufflers for about the same price, I like this because I like the extreme flexibility it offers - Stock Legally Quiet and Top Mang Alcohol Dragster!
Dunno if you've seen this:
If you weren't convinced the Bi-modals are loud enough, or sound a bit 'Euro' then screw your amp gain to max...
to get that window-down, fist-pumpin V8 soundtrack :yarr:
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