 | Home > Puma (Tdci) > 2.4 TDCi Exhaust Drone 1750 - 2000 rpm |
 
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| K9F Member Since: 12 Nov 2009 Location: Bournemouth Posts: 9610   
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Yes decatting can produce a distinctive drone in high gears at about 2krpm which disappears again at a higher rpm. This drone is only under load and at a certain bandwidth of engine load and rpm.
Personally I quite like it and it is probably more distinctive on mine with no rearbox and a straight through centrebox. If you go through life with your head in the sand....all people will see is an ar5e!! Treat every day as if it is your last....one day you will be right!! |
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30th Aug 2015 11:38pm |
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| ozzie1989 Member Since: 25 Feb 2009 Location: Wales Posts: 282  
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Thanks K9F, something to look at then. On your 90 it probably sounds OK, but with the extra length of the 110 exhaust it probably sounds a lot worse if that is the case.
To be specific, the noise/drone appears exactly between 1750 - 1990 rpm, regardless of engine load. It also appears under engine braking, which is what has finally led me to believe it's the exhaust after reading lots of modified car forums. It does get worse under increased engine load, so it is possible to control it slightly by feathering the throttle. It's most annoying when going up hills long hills or motorway ascents as eventually you feel like your head is vibrating and you get a headache! Now: 2010 2.4 TDCi 110 Utility Wagon Then: 2004 2.5 TD5 90 Hard Top (X-Tech Edition) |
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31st Aug 2015 8:15am |
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| Matt110 Member Since: 29 Jun 2014 Location: UK Posts: 673
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I have a 2.2 USW.
I also have almost exactly the same drone! Although mine is 1600-1800. Its on my list to look inti as thats almost exactly where i choose to drive most of the time. Its driving me mad!! so you arent alone. From what i can make out its specific to a 110 tdci, USW/SW both have it which i guess is logical (never been in a HT that may be different), my brothers 130 DCHCPU does NOT have it so this suggests its a resonance created from the rear 110 exhaust section not the front, although thats not hard and fast rule as changing the front section could still affect the resonance pattern and solve the boomy droning noise..... Im not sure. Im reluctant to decat or change the exhaust much. I was wondering whether the EGR being switched off would improve it as when mine is doing a REGEN it near on goes away (changes the resonance frequency for the system), and to do a regen a TDCI closes the EGR. So am considering that one. |
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31st Aug 2015 9:01am |
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| ozzie1989 Member Since: 25 Feb 2009 Location: Wales Posts: 282
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Thanks Matt110, glad I'm not the only one - let's hope we can come up with something.
Good call on the EGR, I wonder what RPM's the EGR is most open at - could well be a pattern there! I will go for a drive today with the EGR disconnected, see if that helps  Now: 2010 2.4 TDCi 110 Utility Wagon
Then: 2004 2.5 TD5 90 Hard Top (X-Tech Edition) |
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31st Aug 2015 9:13am |
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| Matt110 Member Since: 29 Jun 2014 Location: UK Posts: 673
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My brother would im sure correct me here but EGR most likely to be open at low throttle settings and lower revs as it reingests its exhaust to burn off poorly burnt particulates...... high throttle and higher rpm they tend to burn cleaner i think. But they chuff open and closed at all sorts of times depending on a variety of inputs.
Definitely... let me know how it goes! |
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31st Aug 2015 9:18am |
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| ozzie1989 Member Since: 25 Feb 2009 Location: Wales Posts: 282
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OK, no difference with the EGR disconnected. This is of course assuming my EGR is operating correctly. Only way to tell that is to strip it, but it looks a bit of a pain compared to the TD5.
I guess the only way to tell if the previous owner played with the CAT is to strip that too and it looks quite tight to remove also. Will keep up to date, although I'm not sure where to go with it yet. If anyone else has any other suggestions please do share Now: 2010 2.4 TDCi 110 Utility Wagon
Then: 2004 2.5 TD5 90 Hard Top (X-Tech Edition) |
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31st Aug 2015 2:24pm |
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| K9F Member Since: 12 Nov 2009 Location: Bournemouth Posts: 9610
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Hi Ozzie,
The cat is indeed very tight to remove. Your symptoms with regards to throttle feathering and being able to control the sound is exactly like a decat and the same as mine. Easiest way forward for you may perhaps be to remove the centre exhaust section and then run something like a thick length of cable up the exhaust towards the cat and see if it impinges on the internal cell structure. If it passes through you'll know it's been knocked out perhaps? Easiest solution I can come up with unless of course you have access to an endoscope? Here is an example of what some have done.  Click image to enlarge Click image to enlarge Click image to enlarge Admin note: this post has had its images recovered from a money grabbing photo hosting site and reinstated  If you go through life with your head in the sand....all people will see is an ar5e!!
Treat every day as if it is your last....one day you will be right!! |
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31st Aug 2015 2:32pm |
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| mega Member Since: 23 Oct 2010 Location: notts Posts: 33  
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Hi Ozzie my 110 usw 2.4 with a remap and the egr shut sounds like a Lancaster bomber at the same revs as yours . The rest of the car is std and owned from new. It sounds the same with the remap removed.
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1st Sep 2015 8:43pm |
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| ozzie1989 Member Since: 25 Feb 2009 Location: Wales Posts: 282
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Thanks K9F
Thanks mega, I think it's got to be the exhaust because despite everything I've yet to sit in a 90 that sounds the same. If it is there are a few options, weld on resonator pipes, shorten the exhaust (our transit with the same engine has an exhaust that finishes just past the drivers door underneath) or improve soundproofing (although that may not help due to the low frequency). I'll keep you up to date, as im determined to get rid of it! Now: 2010 2.4 TDCi 110 Utility Wagon
Then: 2004 2.5 TD5 90 Hard Top (X-Tech Edition) |
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2nd Sep 2015 6:47am |
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| Matt110 Member Since: 29 Jun 2014 Location: UK Posts: 673
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I'm about to start a very extensive sound proofing activity..... so i'll let you know if that does improve it.
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2nd Sep 2015 3:38pm |
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| ozzie1989 Member Since: 25 Feb 2009 Location: Wales Posts: 282
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Matt110 did your soundproofing help?
I didn't get chance to remove the exhaust rear section whilst the weather was nice 
Due to a change in circumstances I'm now using the defender a lot more and its got to the point where the noise is getting to me a bit now. I'm sure my TD5 was louder, but this noise is at a bad frequency! Now: 2010 2.4 TDCi 110 Utility Wagon Then: 2004 2.5 TD5 90 Hard Top (X-Tech Edition) |
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25th Nov 2015 9:05pm |
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| Eau02467 Member Since: 20 May 2015 Location: Glasgow Posts: 48 
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Guys are you sure what you are hearing isn't induction noise? I get exactly the same symptoms but it is definitely on the intake side and I removed my dealer fit snorkel. It didn't get rid but moved it away from right beside my ear!
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26th Nov 2015 9:52am |
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| Matt110 Member Since: 29 Jun 2014 Location: UK Posts: 673
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Definitely not induction noise. It's exhaust boom, its absolutely characteristic of it what I'm hearing, and I've never been in a tdci 110 that doesn't do it at bang on those revs. Sample size of 4 myself and others with the same issue.
Ive still not fitted that soundproofing so can't comment but my guess is it will only improve it slightly. Ive just learned not to sit in gears that mean it cruises at that RPM. There's no way LR would accept a claim, its a vehicle characteristic, not a design flaw, and would need exhaust tuning (length, expansion etc) to genuinely resolve. Would be interesting to know if anyone has aftermarket exhaust fitted and resolved the issue. 110's, tdci (any), approx 1750 rpm. Exhaust boom. |
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26th Nov 2015 10:44am |
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| g-mack Member Since: 07 Jan 2014 Location: northumberland Posts: 1967
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i feel your pain! I've been suffering in my 300tdi for over year now!!
http://www.defender2.net/forum/topic31049.html My 109 thread my youtube channel |
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26th Nov 2015 12:55pm |
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