 | Home > Td5 > Defender td5 flat under load after bigger intercooler |
 
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| diesel_jim Member Since: 13 Oct 2008 Location: hiding Posts: 6092   
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will need one of the tuning boffins to confirm this, but it could be that the larger I/C is doing its job... cooling the air, which makes it denser.
Thus the MAF is is getting more air through it at any given revs than it can handle, and freaks out (they have upper limits as to what air flow they can compute) and so is giving the ECU the signal to back off a bit. Mine does it with raised boost, You can get modified MAF's I think, certainly different boost boxes (IRB does them) that allows the MAF to cope with greater volumes of air. |
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5th Mar 2014 12:13pm |
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| roel Member Since: 08 Aug 2009 Location: Lelystad Posts: 2039  
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Are your hoses before the turbo still in good shape? Roel
1984 90 2.5 na Diesel - RR V8 (1994-2001) 1997 Camel Trophy Discovery 300TDI (2001-2009) 2005 G4 Discovery III 4.4 V8 (2008-2018) It's gone but it still hurts. 2003 90 Td5 (2009-now) |
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5th Mar 2014 6:05pm |
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| Defender LAF Member Since: 27 Jan 2014 Location: Dartmoor Posts: 14 
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I'll check the hoses before the turbo didn't even think of those?
 I did check the intercooler pipes and they are fine. |
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5th Mar 2014 7:37pm |
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| me@td5.org Member Since: 16 Jan 2011 Location: Warwick Posts: 856 
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Also bear in mind that the larger inter cooler is a larger pressure vessel that your turbo needs to fill, your turbo with standard boost will struggle to fill it and maintain pressure so you will get more lag. www.td5.org
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5th Mar 2014 8:47pm |
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| Defender LAF Member Since: 27 Jan 2014 Location: Dartmoor Posts: 14
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Will it reduce the life of the turbo much if I changed the pressure, and if I did that would I then need a boost box? Thanks for your help so far
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5th Mar 2014 11:35pm |
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| Defender LAF Member Since: 27 Jan 2014 Location: Dartmoor Posts: 14
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Checked all pipes and hoses are good, and seem fine.
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6th Mar 2014 10:45pm |
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| Defender LAF Member Since: 27 Jan 2014 Location: Dartmoor Posts: 14
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Been looking at boost boxes from alive and tmd, both sound as if they would cure my problem by adjusting waste gate and using a box, which would you buy?
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9th Mar 2014 11:37pm |
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| landy andy Member Since: 15 Feb 2009 Location: Ware, Herts Posts: 5707 
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Alive for me, great support and knowledge. Have had three of his remaps, and can't fault them.
Andy |
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10th Mar 2014 6:40am |
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| fixit Member Since: 15 Mar 2012 Location: Sunny devon Posts: 66 |
When you changed the intercooler was it remapped?
I would have thought that to get the best out of it then just changing the intercooler isn't going to do much as its not going to have the right air to diesel ratio Mine has a full size intercooler and boost box running 1.5 bar and is remapped to suit but i have not tried one without the other I would think your best off asking Gary at Alive he is very helpful as there is no point buying more bits to try unless its going to sort it Mine had a moment a little while back sounds a bit like your problems and it turned out to be the airflow meter You may know already but you can unplug the airflow meter and drive it won't go like it should but it will drive ok and if the symptoms are different then its prob just that. |
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10th Mar 2014 7:01pm |
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| fixit Member Since: 15 Mar 2012 Location: Sunny devon Posts: 66 |
It could also be the waste gate sticking and over boosting
I would have a look at that as well but i woudn't adjust it with out a gauge and it would pay to put one on first so you can see whats going on as a little is a lot on the rod lenght |
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10th Mar 2014 7:08pm |
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| Defender LAF Member Since: 27 Jan 2014 Location: Dartmoor Posts: 14
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Its chipped, egr removed, silicone hoses, and pipercross filter, it use to go like a rocket but is just abit sluggish now after a bigger intercooler, MAF has been unplugged for afew days and doesn't seem any different to drive. I do spray abit of wd40 on the turbo actuater now and then i will give it another check.
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10th Mar 2014 8:50pm |
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