 | Home > Maintenance & Modifications > Air box mod and decat |
 
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| Mother superior Member Since: 05 Aug 2013 Location: Surrey Posts: 504  
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Gentlemen
So what do we think? Is it worth doing the air box and decat mods? I'm not expecting a revelation here but can you feel the difference? Cheers Wes |
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8th Jan 2014 10:36pm |
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| Porny Site Sponsor Member Since: 31 Aug 2009 Location: Sutton Coldfield - West Midlands Posts: 809 
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Yes.... but to make full use of the reduction back pressure you should have the engine calibration changed to suit.
Changing the back pressure effects turbo control... and you should correct for this. Air box mods can be good for a gain of 11Nm's on the dyno... and you can go further especially if you don't have ABS (well, it's easier without ABS). Ian IRB The home of the first modified Keswick Green 90 - and the first 2.4 Puma through both the 200bhp and 550Nm barriers. www.IRBdevelopments.com www.facebook.com/irbdevelopments www.integrated316.com www.facebook.com/integrated316 |
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8th Jan 2014 10:38pm |
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| Mother superior Member Since: 05 Aug 2013 Location: Surrey Posts: 504
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Sounds good, I take it that the recalibration needs to be done by a man with one of those computer-box things..
The air box mod I was babbling about is the removal of the fan like thing and the restriction bit. Wes |
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8th Jan 2014 10:45pm |
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| Porny Site Sponsor Member Since: 31 Aug 2009 Location: Sutton Coldfield - West Midlands Posts: 809
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Fan removal and reshaping of the inside of the box... I have been doing this for ages before other people starting copying lol.
And yes - by a man with a laptop, and who actually knows what they are doing... and not just thinks they do.  You will get a nice gain over standard in terms of performance, smoothness and driveability... and typically improved MPG (as per another thread that is running on here at the moment). Ian IRB The home of the first modified Keswick Green 90 - and the first 2.4 Puma through both the 200bhp and 550Nm barriers. www.IRBdevelopments.com www.facebook.com/irbdevelopments www.integrated316.com www.facebook.com/integrated316 |
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8th Jan 2014 10:50pm |
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| Mother superior Member Since: 05 Aug 2013 Location: Surrey Posts: 504
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Cheers Ian
I'll do the air box mod and I'll drop you a PM when I decide to go decat if that's OK Wes |
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8th Jan 2014 10:58pm |
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| Porny Site Sponsor Member Since: 31 Aug 2009 Location: Sutton Coldfield - West Midlands Posts: 809
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No problem Wes.
Ian IRB The home of the first modified Keswick Green 90 - and the first 2.4 Puma through both the 200bhp and 550Nm barriers. www.IRBdevelopments.com www.facebook.com/irbdevelopments www.integrated316.com www.facebook.com/integrated316 |
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8th Jan 2014 11:08pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 20314
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Air box mod? What's involved with that? ⭐️⭐️God Bless the USA 🇬🇧🇺🇸 ⭐️⭐️
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8th Jan 2014 11:16pm |
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| Porny Site Sponsor Member Since: 31 Aug 2009 Location: Sutton Coldfield - West Midlands Posts: 809
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At the very least you can remove the water separator from the dirty side of the filter. This does not work as intended on a Puma and adds a restriction.
On from this you can change the way the air flows inside the box.... and then change the feed pipe from the wing to the air box. My Puma runs my big pipe conversion (100mm pipe) - so no restriction at all. Also works very well on a Td5... Ian IRB The home of the first modified Keswick Green 90 - and the first 2.4 Puma through both the 200bhp and 550Nm barriers. www.IRBdevelopments.com www.facebook.com/irbdevelopments www.integrated316.com www.facebook.com/integrated316 |
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8th Jan 2014 11:21pm |
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| Porny Site Sponsor Member Since: 31 Aug 2009 Location: Sutton Coldfield - West Midlands Posts: 809
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The only downside is an increase in NVH... i.e. the intake becomes a bit noiser.
If you lift the air box out and look inside where the dirty air feed pipe goes into the air box - you will see the water separator... (actually one of two on a Puma). Simply remove and refit air box. Ian IRB The home of the first modified Keswick Green 90 - and the first 2.4 Puma through both the 200bhp and 550Nm barriers. www.IRBdevelopments.com www.facebook.com/irbdevelopments www.integrated316.com www.facebook.com/integrated316 |
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8th Jan 2014 11:32pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 20314
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Ah I see, must do that then. Not worried about a little more noise.
Thank-you for the info Ian, much appreciated.  ⭐️⭐️God Bless the USA 🇬🇧🇺🇸 ⭐️⭐️ |
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8th Jan 2014 11:51pm |
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| JWL Member Since: 26 Oct 2011 Location: Hereford Posts: 3443  
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Yet another one of those jobs on the list. I've got abs on mine along with a RAI that I do want to keep. I want to run a fresh pipe from the air filter box and end it inside the RAI to change it to being a true snorkel, it's just the issue of the amount of space between the hole in the wing and the abs modulator unit. It will get done, one day.
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9th Jan 2014 12:00am |
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| bell-auto-services Member Since: 08 Jul 2007 Location: North Yorkshire Posts: 2232 
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Here is a handy picture showing the losses and restrictions on the puma air intake as standard.
Click image to enlarge Edited picture to show right way up. Last edited by bell-auto-services on 9th Jan 2014 8:05pm. Edited 1 time in total |
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9th Jan 2014 2:50pm |
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| Norm4n Member Since: 31 Aug 2012 Location: Surrey Posts: 329
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Nice diagram, so the biggest restriction is CAD turbo in, is there an intended restrictor there?
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9th Jan 2014 4:12pm |
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| LandRoverAnorak Member Since: 17 Jul 2011 Location: Surrey Posts: 11324
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Those figures are cummulative, so the biggest loss is where the biggest difference is, i.e. between the pre- and post-separators just inside the wing. Darren
110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak "You came in that thing? You're braver than I thought!" - Princess Leia |
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9th Jan 2014 4:25pm |
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