Blocking the EGR Valve

[NickBGU4]

For anyone with the 3 litre ZD30DI engine, all the information to do this mod is in the "Nissan Patrol Reference Document located" in the DIY-manuals section. Please bear in mind that this mod is technically illegal because you are interfering with part of the emission control system (big fines if caught), but the chances of anyone noticing this mod are slim to none. The benefits are well worth the risk.

[NickBGU4]

Sorry Double post, not sure what happened there.

[Patrolling]

I downloaded that reference doc the other night.

I cant imagine how long it would have taken to make something like that.

[NickBGU4]

No idea how long it would have taken, but it is a fantastic document. Aksniss deserves a big pat on the back for all the work that he has put into compiling all of this information.

[Pedro173]

Great stuff I know what I'll be doing Saturday Morning

[Chappy0871]

How you all going? Has their been much feed back when doing this mod to the 3 lt diesels. I am looking to reduce the turbo lag when taking off in 1st.

[my third 256]

Uuummmm thats not quite correct in our context... EGR is how Nissan chose to manage Nox emmissions to meet world anti-pollution standards. I totally agree EGR on its own does raise particulate and gas pollutant levels but these are managed by other anti-pollution systems on their engines. Therefore blocking the EGR significantly raises Nox but doesn't correspondingly lower particulates and other gases as they are already being managed by filters and Cats etc.

Don't get me wrong... I am in favour of blocking EGR (or reducing it on CRDs) but purely for selfish reasons ... it doesn't help the environment because with all its drawbacks there is no way Nissan would have EGR there unless it was absolutely necessary to meet the anti-pol regs. If they could get 25% better fuel economy without needing it they would be dancing in the streets.

why only reduce it on a crd please explain thanks stephen

[oldtimer]

Yep, I agree. Being a tuning specialist for over 10 years back in the 80's I have seen many cars fitted with EGR disconnected. Even to this day the EGR is being disabled. Years ago EGR valves were an absolute pain in the arse. Most would stick partially on, causing idle instability and higher fuel consumption and due to the corrosive nature of the gas, it would eat aluminium and cause lots of problems. I will admit I would disconnect them at the first opportunity, just to stop the accociated problems for my customers. They are fitted only to reduce the NOx pollutant which is produced by high combustion chamber temperatures. Recirculating a small portion of burnt gas (up to 10%) the chamber temperatures are reduced. The up to 25% increase in fuel economy is a falacy. At best 5% would be max. I would suggest anyone that gets better than that, must have had an absolutely stuffed valve to begin with & are therefore justified in getting rid of it. Remember though depending on which state you live in, if your car is tested for NOx levels, you will fail, but what are the chances of that.
Cheers
Mike

[my third 256]

why only reduce it on a crd please explain thanks stephen

so how much should it be reduced please
stephen

[kevjulie]

Hi everyone I am new here, but am having what now seems to be a common problem losing power on hills but seems to pick up again when I back off on eccelarator and depress until it cuts out again. I have clean and check air flow sensor but all readings are good so thinking might be EGR. Does anyone howmuch a new one is?

Kev.