What is EGR delete?

[Fobio]

Hey guys...I'm getting ready to install the inlet tube and was wondering if I should do the EGR delete while I add an OCC...any opinions? pros and cons?

[zoomzoom33]

Are you doing the inlet install yourself? Be VERY careful when you take off the small tubing ( cant remem. name of part ) I broke off the nipple on the oem inlet pipe and could have did the same for the other side. I'm lucky to have not broken off the other nipple that has the wire harness attached to it.

[Unoriginalusername]

egr?

[Fobio]

Exhaust Gas Recirculation

[mleblond]

lol Not sure what this does either

[Fobio]

it's basically the fitting that allows some of the exhaust gases to be sent back thru the intake for emissions purposes...

Reference: http://www.mazdaspeedforums.org/foru...ns-pics-2.html

[Unoriginalusername]

it's basically the fitting that allows some of the exhaust gases to be sent back thru the intake for emissions purposes...

Reference: http://www.mazdaspeedforums.org/foru...ns-pics-2.html

what does removing it do? help emissions?

[Walrus]

The opposite.

[Fobio]

what does removing it do? help emissions?

lol...no...

The opposite.

not necessarily...part of my concern is exhaust blow-by...esp while tracking, during high rpm operation, gasoline seeps into the oil and 1. dilutes the oil 2. contirbute to the overall amount of liquid (oil and gas)...this extra volume, like in a typical situation where the oil is overfilled can get back into the intake and gumming up you intake tract including your precious intercoolers...

As such...having an oil catch can will catch some of this crap before it makes it back into the the intake and also removing the EGR has been known to improve that situation as well (ie. smoking turbo's)

I'm not an expert in these matters and that is why I ask...particularly inregards to emissions and legalities of this...I don't want to do anything illegal...but I do want to ask, as perhaps there are experts in here that knows about this...

Since I've been reading, it appears to be something beyond my expertise or skill level to do anyway...but I'm still interested in knowing more about this from some local experts as this appears to be commonly done with FI/turbo engines...

[WeatherB]

I've seen a post somewhere on the forums indicating that venting the EGR of the crankcase to air is illegal...

[Fobio]

I've seen a post somewhere on the forums indicating that venting the EGR of the crankcase to air is illegal...

Yes...that I know...and I was not talking about venting...but I could be wrong....my understanding is that using a bakplate, you basically seal off the EGR...

I was also asking about the "venting" issue with oil catch can's and apparently, as a long as it's a sealed "loop" then there's no venting...

[WeatherB]

Yes...that I know...and I was not talking about venting...but I could be wrong....my understanding is that using a bakplate, you basically seal off the EGR...

I was also asking about the "venting" issue with oil catch can's and apparently, as a long as it's a sealed "loop" then there's no venting...

Oh okay, don't see why that would be illegal in that case. Thought you were planning on hooking up a tiny air filter to the crankcase EGR hole.

[Fobio]

I'm hoping that some experts in the US will show me the way, but you know they can do all kinds of stuff down there we can't...

and since there aren't much interest or experience with this...well, ADMITTED expertise or experience on a public forum anyway, I'm guessing either it's a bad idea or it's illegal AND a bad idea...

that tiny air filter thing...now I understand what you're talking about exactly by "venting"...I wouldn't want to do that even if it's stealth...I'm not doing anything to my car to get it impounded...

[Unoriginalusername]

whats to be gained with this anyways?

[Fobio]

my turbo smoked cuz my exhaust/oil got sucked back into my intake...this happens in minute amounts to a daily driver...could be a little bad when I track...

this will eliminate one of the sources of this crap going back into my intake...but it's gotta be done proper...

[WeatherB]

I think venting the EGR also gets you a couple of extra HP as well... At least it does on the regular 3, but I wouldn't bother especially when it's illegal.

[mleblond]

my turbo smoked cuz my exhaust/oil got sucked back into my intake...this happens in minute amounts to a daily driver...could be a little bad when I track...

this will eliminate one of the sources of this crap going back into my intake...but it's gotta be done proper...

My car smokes too when I track. I will follow this as I may do the same.

[Pilzz]

I think venting the EGR also gets you a couple of extra HP as well... At least it does on the regular 3, but I wouldn't bother especially when it's illegal.

+1

[Fobio]

I have no intention of venting the EGR...I wouldn't want to drive around in a car like that anyway...can you imagine the smell?

I think that's what Jimmy talked about when I initially asked...I know it's a $600 ticket...and prolyl some other shit...so I woulsn't bother...

From what I have read and somewhat recollect, EGR is there for emissions as it encourages some of the unspent/unburnt gases to have another go at combustion...so venting this is an old racer's trick...I wonder how much of a diff this makes in our cars...since everybody's pushing envelopes anyways, why not give this a go, but ONLY IF IT'S NOT ILLEGAL! I dare to say backplating/blocking it off have the same effect as a high-flow cat...

My only and sole concern is for track days...it scares the old folks when you battle them and they see the car smoking...I go with a daily driver and that's all it'll be... a sleeper with a quick driver...

From all my driving on this car, it's pretty much bulletproof...this is not to gain a few HP...I am more than happy with the car's power...I just want to eliminate any source of exhaust blow-back into my intake to keep the car healthy, and when you think about it, if I'm NOT venting, it's actuall better for the environment...

[Walrus]

Let's bring the discussion back over here.

When I said 'the opposite', I meant blocking the EGR system will increase your emissions. One thing it does at cruise is lower combustion temperatures, which lowers NOx emissions.

[Fobio]

yeah...I figured that if I blocked it off, it can't be much worse than a high-flow cat anyway, but then again I have no epxerience with an EGR-delete and emissions testing...but I figure it's not something I'll have to worry about as long as I'm not venting and creating gasoline odours wherever I drive...

[Walrus]

It may cause you to fail emissions test, due to high NOx readings.

[streetwerks]

doing an egr block off doesnt really get you any serious gains. the main reason for the egr (exhaust gas recerc.) is to introduce exhaust gases back into the intake to be reburned. the main problem when doin the block off plate is an engine light. the egr is monitored on a constant basis. if the pcm output is asking the egr to open and the map sensor does not see a change in vaccuum the engine light is illuminated.

[Fobio]

^^^ thanks streetwerks! the CEL bit is really helpful...in fact, I'm now looking to install a catch can instead of a backplate between the EGR and the intake tract. so seems like the 2-catch can sol'n is inevitable.

[Shen]

I know this thread is old, so what's the final verdict? to delete or not to delete?