egr delete?/

[diabeticon]

Me and my buddy have the idea to delete my egr sytem in my 89 240. Does anyone recomend this or oppose? I have the block of plate and gasket already, im just a little leary about it. Any help will be most appreciated!

[-RJ-]

if your place does smog inspections, then dont do it

[speedeast]

Do it.

[diabeticon]

No emisions in indiana. Whats the benifet?

[vmiramon69]

do it ...but if u gonna do it do it right and get all the crap off the back of the block..make sure u plug the manifold right u know u cant weld on it. and might as well get the AIV out too it looks great and less crap on the way when u work on it

[GO240]

just do it and don't regret it keep your iacv it gets annoying listening to your idle go up and down up and down up and down

[speedeast]

The actual benefit is a lower intake air temperature. I don't know by how much though.

[Wc240]

removing it will give you higher temps at cruise. slight decrease in MPG(tho, you probably wont even notice) if cops know aything and pop your hood, well, guess what happens.

honestly, not really any pros. i guess if your bored, go for it

[diabeticon]

Well i work at a diesel mechanic shop and a few of the mechs say DONT DO IT.! They say it might run fine for a few weeks but sometime down the road itll start running like crap....any truth to this for anyone that has deleted the egr system????

[speedeast]

Well i work at a diesel mechanic shop and a few of the mechs say DONT DO IT.! They say it might run fine for a few weeks but sometime down the road itll start running like crap....any truth to this for anyone that has deleted the egr system????

That's not really true. There are many many members of this forum who have upgraded what's under the hood, and almost none still have the EGR system. Almost all aftermarket headers are huge improvements over stock headers and I have yet to see any that are EGR ready. EGR is mainly an emissions thing.

Intake air temperature WILL be lower, but the combustion that occurs will be hotter because there is more oxygen. See, the recirculated exhaust air displaces clean air. Higher temperature combustion creates more nitrogen oxide which is tested in emissions. EGR gas can increase the acidity of your oil, it reduces peak power output, and reduces the specific heat ratio meaning that a non-egr system is more efficient (loses less energy per piston).

EGR gas mixtures have a slower combustion that is compensated by advancing the ignition timing from the factory. This can be easily corrected if the EGR is deleted.

[diabeticon]

Ok next question ...i read on some random website that if you delete the egr system that you have to go into the pcm and change when the egr is turned on so that ir never turms on... true or false?

[speedeast]

With an EGR delete... there's nothing to turn on. EGR is supposed to be closed during idle otherwise the car would just stumble until it turned off. If you delete the EGR system, make sure you plug the exhaust manifold and remove the EGR valve from the intake manifold and plug that hole too. Simple, done and done.

[Wc240]

Intake air temperature WILL be lower, but the combustion that occurs will be hotter because there is more oxygen. See, the recirculated exhaust air displaces clean air. Higher temperature combustion creates more nitrogen oxide which is tested in emissions. EGR gas can increase the acidity of your oil, it reduces peak power output, and reduces the specific heat ratio meaning that a non-egr system is more efficient (loses less energy per piston).

EGR gas mixtures have a slower combustion that is compensated by advancing the ignition timing from the factory. This can be easily corrected if the EGR is deleted.

just wow. if the egr displaces clean air, then it cant run hotter due to MORE clean air. cumbustion temps go down becouse the exhoust that is cycled back through is an inert gas. LOWERING the nox(oxides of nitrogen) it wont do anything to your oil unless mabe if you have massive blow by, but then your screwed anyways. doesnt reduce your power output, it only operates during CRUISE, so if your foots to the floor, it isnt functioning anyways. the whole comment about the timing is beyond correctable.

peaple, its really amazing what a few clicks on google can do. try it if you REALLY want to know about the egr. its a simple, effective system, and i really dont know where these rumors come from. i guess peaple think its emissions so it must rob power, then try to justify it with big words( most of wich are assembled wrong anyways)

[Rev_D21]

[speedeast]

just wow. if the egr displaces clean air, then it cant run hotter due to MORE clean air. cumbustion temps go down becouse the exhoust that is cycled back through is an inert gas. LOWERING the nox(oxides of nitrogen) it wont do anything to your oil unless mabe if you have massive blow by, but then your screwed anyways. doesnt reduce your power output, it only operates during CRUISE, so if your foots to the floor, it isnt functioning anyways. the whole comment about the timing is beyond correctable.

peaple, its really amazing what a few clicks on google can do. try it if you REALLY want to know about the egr. its a simple, effective system, and i really dont know where these rumors come from. i guess peaple think its emissions so it must rob power, then try to justify it with big words( most of wich are assembled wrong anyways)

First, go back and read my post again. We'll start with the hotter combustion. EGR gas IS inert, thank you. Do you know what that means? In this application it means that it won't burn. If you remove this inert gas from the combustion chamber then you have more gas that WILL burn --> higher combustion temperature. Next, lowering the nitrogen oxides won't do anything to your oil? Duh, I never said it would. If you engine burns hotter it produces more nitrogen oxides. With more nitrogen oxides, the engine oil can become more acidic. It's not going to be significant and it wouldn't happen quick, but it DOES happen. If you lower the nitrogen oxides, it only makes sense that the chances of oil becoming more acidic are lower. If you don't know, then please don't try to read your google results and come up with a conclusion about stuff like this. And what I said about timing is correct. Go research some more. At least it sounds like you know what blow-by is. Unfortunately this is about the EGR system, so bye.

[Ajax]

Considering Nissan makes a plug for the exhaust side, I doubt it does much harm.part #14052 - 21R00

[Wc240]

google results?

dude, that was for others on this forum. me personally, im a very acomplished smog tech/nissan tech who diags egrs all day due to the fact that my shop specializes in modified cars that others turn away. so yeah, i have a little experience with this issue

your posts contradict themselves. alot. stop misimforming peaple

[guyaverage]

Wc240, your info is correct.

I usually deliberately stay out of EGR threads because of the amount of BS in them, but then I stay out of most other threads for the same reason....