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Hi... do you need to have the Elgrand de-cat or not.. had differing advise from sellers?

Just to try keep things in the same place I’m replying in this thread
Having had the rear cats removed I feel better, I will feel even better when I get around to removing the fronts( possibly for stainless and add sport cats slightly further back)
Question;how many 2.5’s have failed and how many 3.5’s
I don’t expect anyone to have an exact answer and I know they are all quads but wondered if power output and possible driving modes may have an impact
 
Great questions by Dave, does anyone have the answers?
 
Can anyone tell me how I can tell if it has been decatted
 
RobSS said:
Great questions by Dave, does anyone have the answers?
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No real stats on cat / engine failure
@Highway Dave mentions driving modes , one thing that’s for sure is 3.5’s should be run on Premium fuel 99 Ron (E5) ,
2.5’s will run on standard fuel.

Not too sure if the new E10 can be classed as Standard or be suitable for the age of the 2.5 E51

E10 has cropped up a lot lately , some 3.5 owners are willing to take the risk in using it to save a bit of money ... despite Nissan Japan not recommending it.

I have seen a write up on the front Cats that said they are sensitive to fuel quality , I suppose it means the gases / vapours they get exposed to .
 
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Does this maybe imply that the 2.5 is less likely to have cat issues? Would you be well served to use a medium grade in the 2.5?
 
Lacabrera said:
My opinion? If you remove secondary cats and primary cats break up it's possible a piece of the catalyst can block the centre exhaust box causing exhaust pressure to push catalyst dust into a combustion chamber from the opposing cylinder bank.
Unfortunately for @dognero this was the most likely reason for the damaged engine.
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Hi,

Just read this. Are you saying that, should a front cat fail and block the centre exhaust box, the pressure from one cylinder bank would be enough to overcome the exhaust presure on the other bank and catalyst dust would enter the cylinder via the exhaust valve having travelled back up the exhaust system ?
 
Could anyone please tell me the cost of this work and what solution they went for.
Thanks in advance.
Dave.
 
Hi ,seems like what I'm looking for do they have a Webb site or contact number.
Tia Dave Lewis
 

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Thank good to know
 
LeStempy said:
Yes, best not buy from someone who says cats aren't a problem. Nissan know it's a problem so I think they should know best.

The reason for decatting is that the front cats can disintegrate over time and block the secondary rear cats. If this happens it's instant engine destruction. So by removing the rear cats, if the fronts do deintegrate there will be nothing there to become blocked.

The secondary cats are only fitted due to much stricter emission laws in Japan, they are not needed in the UK as the Elgrand will easily pass the MOT test without them.

Hope that explains the situation.
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Thank you, really helpful info
 
AlanM said:
What an absolute loads of cobblers from that dealer - he needs to be publicly shamed for such blatant ignorance on the topic.
  1. firstly, irrespective of the brand of car, any car with a front and rear cat faces the same potential problem in that when (and it is when, not if) the front cat breaks up due to age, the debris can get stuck in the rear cat with then the potential to cause engine damaging back pressure.
  2. secondly, Nissan themselves put out recalls due to the ECU over-fuelling which led to uncombusted fuel getting into the cats and igniting there which in turn caused premature failure of the cats
  3. thirdly, there are so many tales of forum members having cat failure issues, and better that just stories, one member recently had photographic evidence of the cat breakup which unfortunately for them, had caused unrepairable engine damage and thus the scrapping of the vehicle.
So as has been suggested, if your dealer persists in such views then just go else where.

I got my car from an import agent and one of the things he told me right from the start was to get the rear cats sorted. And there's the difference - the import agent had no vested interest in the cats question whereas a dealer's bottom line is affected if they do the decoring.
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Thank you for these details!
 
sophmun said:
Thank you for these details!
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Please take advice from owners that actually know what they are talking about? Removing the secondary converters is definitely not the correct way to solve this issue.
 
Lacabrera said:
Please take advice from owners that actually know what they are talking about? Removing the secondary converters is definitely not the correct way to solve this issue.
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Just bought it, took it to a local Elgrand mechanic and that's he said he'd suggest?
 
It's what most people do as a preventative measure, but it's still not guaranteed. Best solution is to have the front cats replaced as they will likely be beyond their service life, but it's a time consuming and so costly job, removing the rears is quicker easier and cheaper which is why most go for that option. If you've got the bucks then look at a full replacement stainless steel system from manifold back.
 
LeStempy said:
It's what most people do as a preventative measure, but it's still not guaranteed. Best solution is to have the front cats replaced as they will likely be beyond their service life, but it's a time consuming and so costly job, removing the rears is quicker easier and cheaper which is why most go for that option. If you've got the bucks then look at a full replacement stainless steel system from manifold back.
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Or buy a Bongo.
 
LeStempy said:
It's what most people do as a preventative measure, but it's still not guaranteed. Best solution is to have the front cats replaced as they will likely be beyond their service life, but it's a time consuming and so costly job, removing the rears is quicker easier and cheaper which is why most go for that option. If you've got the bucks then look at a full replacement stainless steel system from manifold back.
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Thanks LeStempy. What bucks range we talking?
 
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