Advanced Techies... EGR

[NERD]

Do I need it? Will it affect my MPG for the better or worse?

 

[Jrgunn5150]

You don't need it, it probably does help squeek out a few more mpg at cruise, nothing drastic. There's no real reason to remove it though.

 

[cobraclone]

ok please forgive my lameness but whats this Advance techies.. i know what an egr is , is this a block plate or restrictor?

 

[Jrgunn5150]

Lol, Advanced Techies is who he wanted to reply. And yes I think super highly of myself :hammer:

 

[MustangMatt96GT]

It is ugly and that is why I'm deleteing mine.

 

[Jrgunn5150]

It is ugly and that is why I'm deleteing mine.

That I can agree with.

 

[cobraclone]

Lol, Advanced Techies is who he wanted to reply. And yes I think super highly of myself :hammer:

well just wanna make sure, some people sometimes refer to things differently . I thought there was something called like that , anyways ... dosnt the EGR help prevent detonation and lower combustion chamber temperatures??

 

[Jrgunn5150]

Lol, Advanced Techies is who he wanted to reply. And yes I think super highly of myself :hammer:

well just wanna make sure, some people sometimes refer to things differently . I thought there was something called like that , anyways ... dosnt the EGR help prevent detonation and lower combustion chamber temperatures??

Yes, but removing it won't be detrimental, any real way. Or gainful, but like Matt said, it is ugly. It also is the biggest hassle in changing intakes.

 

[95PGTTech]

Lol, Advanced Techies is who he wanted to reply. And yes I think super highly of myself :hammer:

well just wanna make sure, some people sometimes refer to things differently . I thought there was something called like that , anyways ... dosnt the EGR help prevent detonation and lower combustion chamber temperatures??

EGR, or exhaust gas recirculation, was implemented to reduce levels of oxides of nitrogen (NOx's) being produced by the motor and exiting out to the atmosphere. It does so by recirculating spent exhaust gases back into the intake manifold to enter the combustion chamber a second time.

Contrary to popular belief, these gases ARE NOT reburned. Because all the oxygen and fuel is spent, there is nothing to re-burn. The spent gases simply take up space inside the combustion chamber that would normally be taken up by fresh air and fuel - therefore reducing power output considerably, and, as the goal is, to lower combustion chamber temperatures (the higher temperatures are what cause massive amounts of NOx production).

At WOT or heavy throttle situations, the EGR does not recirculate, so you won't be seeing any real performance increase - likewise, since nothing is being reburned, you will also not see any fuel economy increase or decrease.

A helpful link:
http://en.wikipedia.org/wiki/Exhaust_gas_recirculation

Hope that helps.

- Julia

 

[Jrgunn5150]

I've always been under the impression that the EGR allows for more aggressive timing at part throttle, by cooling the chanber a bit?

 

[NERD]

How in the world does hot exhaust gases cool the intake???

 

[Jrgunn5150]

They slow the burn, cooling the combustion chamber. Like Julia said, it stays closed at WOT, at part throttle is where the benefit is though.

 

[95PGTTech]

How in the world does hot exhaust gases cool the intake???

Because "hot" exhaust gases are relatively extremely cold when compared to 1600+ degree combustion chamber temperatures. Like I said though, it cools the combustion chamber by taking up some room and making it useless for combustion. Less total combustion = less heat.

- Julia

 

[NERD]

Oh, that makes sense...

 

[Johnny Langton]

EGR does help fuel economy at part throttle. By taking the place of air and fuel in the combustion chamber,it effectively reduces the displacement of the engine. Due to this "effective" displacement reduction, the output power of the engine is reduced, so you must open the throttle plate further,thereby reducing the pumping losses of the engine. This in turn increases fuel economy, but ONLY at part throttle cruising. My car has it. It works, it's beneficial, won't hurt power output, so there's no reason to remove it-plus it's an instant failure of any inspection or emmisions test if it's not there.
JL