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Home > Puma (Tdci) > Vibration on overrun after fitting Alive Comfort springs
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TheJollyBodger



Member Since: 27 May 2015
Location: Ramsbottom
Posts: 74
United Kingdom 2015 Defender 90 Puma 2.2 XS CSW Santorini Black
Vibration on overrun after fitting Alive Comfort springs
Hi All,

Hope you can help.

Since fitting some alive comfort springs, Bilstien shocks and uprated anti roll bar I've been getting quite a nasty vibration on overrun when decreasing speed from 75 mph..

It does it both 5 & 6th gear and only around the 70 mph hour mark.

I've just rang Alive who insist that it couldn't be anything to do with the suspension and it's just a coincidence but I have found other people having similar issues when they change from non standard springs (Normally lifting) but nobody has pin pointed what the issue is. They are normally on older model defenders too.

Best way to explain the noise is as if I'm driving over a motorway rumble strip. If I feather the accelerator and really gently let off the gas it doesn't do it, however just taking my foot off completely causes it.

Any pointers before I take it in for Warranty work?

Thanks
Lee
Post #552851 1st Aug 2016 2:37pm
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languedoc



Member Since: 13 May 2016
Location: Edinburgh
Posts: 283
Scotland 2008 Defender 110 Puma 2.4 CSW Alaska White
I found this on mine with winter tyres. The weight shifting to the front on deceleration meant my rear tyres had a vibration.
Post #552853 1st Aug 2016 3:08pm
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TheJollyBodger



Member Since: 27 May 2015
Location: Ramsbottom
Posts: 74
United Kingdom 2015 Defender 90 Puma 2.2 XS CSW Santorini Black
Thanks, but it's definitely coming from the gearbox - I can feel it through the gear stick and under my feet.
Post #552854 1st Aug 2016 3:09pm
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couplands



Member Since: 31 Aug 2011
Location: Peak District & Cornwall
Posts: 1826
United Kingdom 2001 Defender 90 Td5 HT Oslo Blue
Could it be related to the handbrake drum..?

Just a thought.

cheers

simon
Post #552855 1st Aug 2016 3:16pm
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bpman



Member Since: 21 May 2008
Location: Oslo
Posts: 8069
2008 Defender 110 Puma 2.4 SVX Station Wagon Santorini Black
I lowered my rear springs when in CH, this caused a vibration in the front propshaft... put normal springs back on and it went away. the other solution is to fit a D/C front prop (or stay under 75mph Whistle )
Post #552860 1st Aug 2016 3:31pm
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TheJollyBodger



Member Since: 27 May 2015
Location: Ramsbottom
Posts: 74
United Kingdom 2015 Defender 90 Puma 2.2 XS CSW Santorini Black
Its hard not doing with a Bowler tune and a heavy right foot Smile
Post #552862 1st Aug 2016 3:32pm
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davew



Member Since: 02 Jan 2012
Location: North Yorkshire
Posts: 888
England 1990 Defender 90 V8 Petrol PU Auto Rioja Red
Sounds like it could be a propshaft issue, perhaps the change in geometry has revealed a tight spot in a UJ or the phasing is no longer correct.

I have no idea what the comfort springs are but if the vehicle has been lowered or raised as a result of them then there's a very good chance propshaft vibration is the problem. For raised vehicles it's often an issue that can be fixed by adjusting the phase of the front prop or replacing it with a double cordon version. http://www.yorkshireoffroadclub.net/
Post #552863 1st Aug 2016 3:34pm
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TheJollyBodger



Member Since: 27 May 2015
Location: Ramsbottom
Posts: 74
United Kingdom 2015 Defender 90 Puma 2.2 XS CSW Santorini Black
Fantastic - that's exactly what I needed to hear, thank you very much.

Now, how to phase a front prop Smile
Post #552866 1st Aug 2016 3:56pm
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davew



Member Since: 02 Jan 2012
Location: North Yorkshire
Posts: 888
England 1990 Defender 90 V8 Petrol PU Auto Rioja Red
First thing you should do is take the front prop off and drive it like that (diff lock in) to make sure the vibration goes away - if it doesn't then at least you've ruled the front prop out ! It's always the front prop by the way, it's a result of the front suspension geometry.

You can take it to a propshaft specialist or try adjusting it yourself via trial and error - assuming it's correct in the first place, make sure you mark the original position before you start. The local "guru" that's made custom props for me seems to be able to look at the relative angles of both ends and tell you what the phase angle should be... not sure if he has a formula in his head or uses some form of black magic but it does seem to work !

You're trying to compensate for the differing angles of the diff pinion and the transfer box by deliberately putting the UJs out of phase so they cancel each other out. Standard front shafts are already out of phase to compensate and my guess would be that when lowering a vehicle you should rotate them so they are further from being in phase. Lowering the ride height will cause the nose of the diff to rotate downwards which I think will increase the difference in angles between the diff pinion and the transfer box output. If it's only noticeable at speed it probably doesn't need to be moved far.

Alternatively you can look at changing the pinion angle with some castor correction bushes used the wrong way around (they're normally used to compensate for a 2 inch or more lift). Lowering the vehicle will have effected the castor angle although normally it's not noticeable with less than a 2 inch change, as you're going the "wrong way" from the optimum pinion angle perhaps it becomes more noticeable with less change. http://www.yorkshireoffroadclub.net/
Post #552936 1st Aug 2016 7:18pm
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TheJollyBodger



Member Since: 27 May 2015
Location: Ramsbottom
Posts: 74
United Kingdom 2015 Defender 90 Puma 2.2 XS CSW Santorini Black
Thank you for the detailed response.

I'll speak to a few guys I know to see if they can recommend someone.

Will it be doing any damage in its present state? It only really happens after lifting off when driving over 70 mph.
Post #553045 2nd Aug 2016 10:20am
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discomog



Member Since: 09 May 2015
Location: Notts/Lincs Border
Posts: 2526
United Kingdom 2015 Defender 90 Puma 2.2 XS CSW Santorini Black
Hi Bodger. I think this video may explain your problem. Make sure you have the volume on.

http://www.macsmotorcitygarage.com/2014/07...d-phasing/

I find it hard to believe that Alive have not encountered this problem before. Defender 90XS SW
Mini Countryman Cooper S
Morgan Plus 8
Post #553054 2nd Aug 2016 11:01am
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