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Generation 4-3 Pajero NW model 2011 - 2014

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Old 14-03-19
Uncle Fester's Avatar
Uncle Fester Uncle Fester is offline
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Originally Posted by rykiel575 View Post
From my reading beaudesert do a 2.75" to differentiate themselves from the others but there was a poster on here who argued that 3" is better which i am more inclined to believe.
Ive had both on my 2010 NT Auto and I couldn't notice any difference between the 2.75 BD and the 3.00 Scotts Rods one I have on now.
NT 2010 GLX Police Pack, Auto 3.2 Diesel, Smartbar, Warn XD9000 Winch and Rear Diff Lock. Cooper AT3s on Factoty Alloys, 45mm lift TJM XGS GOLD front & rear, S/D with Poly air bags Rear and HD Front , Bushskinz I/C guard, TJM T/F Case And G/Box guards, Duel Battery setup with Redarc Isolator and Redarc electric brake controller.
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Old 15-03-19
rotare rotare is offline
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Originally Posted by fourocker View Post
I have read this occurs because it's not a simple waste gated turbo (which is more reliable), it is an ecu controlled turbo and if the extra exhaust flow has the turbine spinning faster than expected it can take the ecu a little time to regain control.
If you believe it or not that's up to you but I thought the op should be aware of the possibility.
This has been discussed before. Plenty of people are running 3 inch exhausts on their Pajero's, including myself, and have never experienced any over-boost - ever. In previous threads on this topic some people have pointed out various other makes and models of vehicles have known issues with over-boost when larger exhausts are fitted - so blanket statements are made and conclusions are drawn that it will be an issue on the Pajero as well, but it appears not to be for most.

In regards to your comments that a 3 inch is totally unnecessary. A turbo charger works best when the pressure differential across the turbine is maximised. The best and easiest way to achieve this for most people is to have zero restriction / back pressure on the outlet side of the turbine (ie, the exhaust). Hence why the largest and least restrictive exhaust will give you the best outright performance and responsiveness. In theory the 3.2 engines may only need a 2.75 inch exhaust to achieve this, however factor in weld protrusion inside the pipes, mismatch of pipes when welded together, mismatch of flanges and gaskets, friction losses from bends, back pressure created by mufflers etc etc, and what you end up with is a systems that flows much less than 2.75 inches....

Hence why it makes sense to fit the largest practical exhaust which helps negate and offsets these common issues when exhausts are constructed. The other consideration is that 3 inch pipe, mufflers and components are way more common to source than 2.75 inch. Every exhaust shop carries the stuff. So if you ever need to have repairs done to a 3 inch exhaust you'll find it will be much easier and cheaper, and you'll have more choices of mufflers, than 2.75 inch.

Unless you have space limitations under your car that requires you to fit a 2.75 inch exhaust, a 3 inch exhaust will work just fine, likely perform better and probably be cheaper to purchase than the 2.75 inch exhaust anyways
2013 NW VRX
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Old 15-03-19
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Another member of the 3" gang here - no overboost issues since installation over 4 years ago.
2011 Silver NT GLS DiD Auto with extra bits - build thread
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Old 07-04-19
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The standard system is definately not 2.75". Lol. Some sections are 2.25". You will benefit from a 3. I have a Beaudesert 2.75" and am super happy with it.
2013 NW 3.2 DiD VRX. EFS Elite HD 2" suspension. Boos Bash plates. Roley rear plate. Ironman bullbar with 1200lb winch and DRL's. 9" LED spots. Dual Battery. Ocam rails and roof rack, Kings 2.5x2.5 awning. Beaudesert exhaust with muffler delete. Safari snorkel. Provent 200 catch can. Single drawer with fridge slide, Evakool 50L fridge. Redarc Elite electric brake controller. EGR turned off and blanked. Idrive. Ultragauge.
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Old 07-04-19
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As rotare already mentioned, turbos work on differential pressure. Go as big as you can practically fit in other words.

And there is zero point only replacing some of it. If you do it, you need to do the lot of you are wasting your money. The pressure seen will be from the smallest diameter point in the whole system.
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