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Discussion Starter · #1 ·
My 2012 CRD has always had high egts, around 480-580c (probe within 50mm of turbo out) on hwy unloaded. 106,000kms. Had new injectors and rail recently replaced under warranty and made little difference to egts. 33" tyres and chip installed. Chip probably added 10% to egts. I would like to get my egts lower. How much of a drop can I expect from going stock (less centre muffler) to a 3" system?
 

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Discussion Starter · #3 ·
Chip tuning (new chipit) chip running tune 5

Did a recent experiment comparing egts and fuel economy with chip in and chip out. Egts with chip out 480- 530c. Have had back to nissan (have a really good and thorough dealer here) requesting they look for why high egts. They checked everything from overfueling to cooling system to head cracks, and everything came back normal. have asked other dealers and the normal response of "nissan don't monitor egts so there is no normal" is what I have gotten. Rail and injectors replaced after fuel leak detected.
 

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Discussion Starter · #5 ·
Gauge has bern confirmed by diesel specialist I took vehicle to when started chasing reasons for high egts. They like nissan said it was slightly higher than they would have expected but ok. Taken to both with chip removed. Chip makes worse which I am following up with manufacturer see why.
 

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Discussion Starter · #7 ·
Absolutely Celsius.

Before I took out the centre muffler it would climb as high as 700C. Now it will easily climb to 630 under load in overdrive
 

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Discussion Starter · #8 ·
Is it a restriction issue because of chip and snorkel? I even had back pressure on exhaust system checked, when Nissan checked everything else. All from radiator to exhaust checked...all came back ok.

How much will 3" Exhaust help. I think egts are too high but have run out of things to check
 

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I didn't notice my EGT reduce significantlly when I installed my 2 3/4 inch system. They certainly reduce quicker at idle with the exhuast but whilst driving the reduction was minimal.
 
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Discussion Starter · #10 ·
Thats what I noticed when removed the centre muffler.....egts stayed the same but would drop alot more rapidly when off the accelerator
 

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Have you got a 3" system from turbo back, hi flow cat and no muffler........and still have high EGT ???
 
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Discussion Starter · #12 ·
No standard exhaust at the moment, except centre exhaust removed.

Trying to a....find out if 3" will help and by how much and b.....if there is anything else I have missed that I could check re high egts
 

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Mate those egts are not low, but aren't stupidly high either.
I think you will find most CRD patrols will hit 600 fairly easily when sinking the boot in and can climb to 700 when accelerating up hills.
Mine has a 3" exhaust and a HPD intercooler and that combo has reduced EGTs in general, but I can still hit some high numbers if going hard.
If it was constantly over 600 on flat ground doing highway run then I'd be looking into it,
My egts on an unloaded highway run vary from 300 - 500
 

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Discussion Starter · #14 ·
Thanks Lorta. I am wondering if there is a correlation between the high egts, standard exhaust and mediocre fuel economy
 

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What the problem is, is that the engine needs to constantly work hard to keep the patrol moving. It's a 3 tonne brick on wheels that requires a fair bit of right foot to get upto and maintain speed. The result of constantly being on the gas to maintain speed is high egts and fuel usage. That's why lighter and more powerful cars do it easier, cooler and more efficiently.
But the patrol has its place and offroad is where it comes into its own, that's the price you pay for a heavy duty 4wd.
CRDs can be good on the juice, when mine was brand new it would get 10lph on the highway, add tyres lift, barwork and more weight and its now 13 - 14
 

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Discussion Starter · #16 ·
Thank you for the feedback....its appreciated. My egts are 480-550 unlaiden hwy and 15ltrs 100 unlaiden
 

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I've just installed a 3" DEA system high flow cat and muffler no resonator, really nice system and fitted up perfect. What really surprised me was the weight of the old system especially the two cats and how small and restrictive the dump was. Restriction of exhaust gases through those two cats probably doesnt help the EGT, my patrol is now breathing a sigh of relief, I set my DP on 5 for around town and 6 when towing. I cant tell you what my EGT are but I have noticed the water temp now sits on 86 / 87 where as before the new exhaust it sat on 88 / 89 around town.



No standard exhaust at the moment, except centre exhaust removed.

Trying to a....find out if 3" will help and by how much and b.....if there is anything else I have missed that I could check re high egts
 
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Discussion Starter · #18 ·
Interesting. Thanks for that. scangauge says my water temp on hwy not hot day is normally 92-93c, not sure about around town. What did you pay for your system fitted?
 

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Interesting. Thanks for that. scangauge says my water temp on hwy not hot day is normally 92-93c, not sure about around town. What did you pay for your system fitted?

I had mine delivered to Perth $645 all up and changed it in my driveway, not too hard to do except for the heat shield but that eventually came off and it went on really easy once I modified it. If you decide to do it yourself I took pic of the modified shield and can give you a bit of advice on the install of the system.
If I'm towing my scangauge will read anywhere from 89 to 93 depending on the terrain, hottest it has ever got is 95 long steep hill but dropped quick over the other side, I will be taking note on the water temps on our next towing trip and gears needed for certain hills with the new system.
 
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