Thread: EGR kits,, do not buy!!!

Originally Posted by Dougal

Any turbo engine varies boost with throttle inputs. It doesn't matter whether it has ECU control, fixed geometry, variable vane or otherwise.

EGR is still being used in all engines and will be for some time. They simply filter it better to stop re-introducing soot.
Apparently caterpiller weren't using it, but now even they have buckled. If you can't meet emissions standards, then you can't sell engines.

Yes but even at a constant revs the ecu will still lower boost for egr in a ZD30 Patrol. What we found in a ZD30 was if we are cruising at say 100kph and we just feathered the throttle a tad more the ecu would then say "hey great conditions for some egr" and promptly lower boost to allow more egr. Because we had blocked the egr we had to overcome the ecu for a consistant boost. Hence a tdi controller was fitted to overcome this. But remember we are talking about a Patrol and I am sure you and your Patrol mates know why we mod them? That why I am thinking its time for a Defender, but dont tell my ,mates on Patrol4x4.com
lol

Originally Posted by maysy1

Yes but even at a constant revs the ecu will still lower boost for egr in a ZD30 Patrol. What we found in a ZD30 was if we are cruising at say 100kph and we just feathered the throttle a tad more the ecu would then say "hey great conditions for some egr" and promptly lower boost to allow more egr. Because we had blocked the egr we had to overcome the ecu for a consistant boost. Hence a tdi controller was fitted to overcome this. But remember we are talking about a Patrol and I am sure you and your Patrol mates know why we mod them? That why I am thinking its time for a Defender, but dont tell my ,mates on Patrol4x4.com
lol

Why did you consider the lowering boost to be a problem that needed fixing? Did EGT's get close to four figures?

Originally Posted by Zute

Lionel wrote:
If you are happy about this, well and good, but personally, I have no desire to adversely affect the environment unnecessarily, so I won't be removing mine.


Oh Crap, If your going to throw this into the argument, than you had better explain why your driving a large 4wd.

Strangely enough, being a member of this forum, I do like to go bush on occasions.

It's a bit hard to do that in a Toyota Prius!!

Is that a good enough explanation?

Cheers,

Lionel

Originally Posted by Zute

Lionel wrote:

Oh Crap, If your going to throw this into the argument, than you had better explain why your driving a large 4wd.
Did you not read about trailing throttles ?
What about all the extra energy used to manufacture an EGR system in the first place ?

Actually, we are not talking about extra energy so much here, it is the production of nitrogen oxides under certain running conditions.

Perhaps YOU should read about trailing throttles! And, while you are at it read the rest of the thread - only carefully this time!

Cheers, (again)

Lionel

Originally Posted by Dougal

Why did you consider the lowering boost to be a problem that needed fixing? Did EGT's get close to four figures?

For a ZD30 and I am talking ZD30 we try to avoid anything over 650c post turbo. We are of the opinion high egts in conjunction with overfueling because of a filthed up MAF from egr and blowby oil, contribute to cracked pistons thus engine failure. Once again egts in an ZD30 can be controlled by upping boost but only to a point. I guess it is a fine line.

Originally Posted by maysy1

For a ZD30 and I am talking ZD30 we try to avoid anything over 650c post turbo. We are of the opinion high egts in conjunction with overfueling because of a filthed up MAF from egr and blowby oil, contribute to cracked pistons thus engine failure. Once again egts in an ZD30 can be controlled by upping boost but only to a point. I guess it is a fine line.

Anyhoo the debate has been fantastic and there will always be conjecture re egr systems! Those that say nay or yay to egr. The statements made by myself is my take only. So take from it what you will. In fact dont take it at all. I will just shut up and go into the night. I think my beer is cold enough now! Might just have one.

Originally Posted by Dougal

Any turbo engine varies boost with throttle inputs. It doesn't matter whether it has ECU control, fixed geometry, variable vane or otherwise.

EGR is still being used in all engines and will be for some time. They simply filter it better to stop re-introducing soot.
Apparently caterpiller weren't using it, but now even they have buckled. If you can't meet emissions standards, then you can't sell engines.

Yes looks like Cat likes egr systems eh???????
Whilst scanning through yesterdays carsguide in the Daily Telegraph I found an article about Caterpillar dumping Exhuast Gas Recirculation (EGR) across its range of new engines. CAT belives that while it is a successful way of reducing nitrous oxide emmisions it has an unnacceptable outcome for users in the form of less performance, higher fuel economy and a reducting the longevity of the engine. One of CAT's marketing mannagers went on to say, "We made EGR work, nut we just couldn't see the value for the customer. The fuel econmy was worse, there were alot more maintenance problems so we abandoned the technology.".
CAT is now using a system called ACERT which uses a package of components to reduce the formation of nitrous oxide at the combustion point through twin turbochargers (to cram as much Oxygen in as possible) and injecting fuel in a series of shots rather than a single one and variable valve timing on the inlet valve. CAT now claims a tougher, more powerful and econmomical engine than before whilst still being as clean and green. (as per article researched on Exploroz and additional mechanical engineering journals)

Originally Posted by maysy1

For a ZD30 and I am talking ZD30 we try to avoid anything over 650c post turbo. We are of the opinion high egts in conjunction with overfueling because of a filthed up MAF from egr and blowby oil, contribute to cracked pistons thus engine failure. Once again egts in an ZD30 can be controlled by upping boost but only to a point. I guess it is a fine line.

If you're concerned about engine failure, then you need to shift that probe. Post-turbo temps are useless because the temp drop across the turbo varies with EGT's, boost, rpm and many more factors.

Regarding caterpillar, have you got a link to any recent articles? I can find heaps from 02-05, cat introduced EGR in 07.