331 and/or Supercharger guys EGR help please

[7upstang91]

When I replaced my my EGR minutes ago I noticed that the vacuum line on top of it was not there. Nor had one been on there. Not that the car ever ran bad, it doesn't now but how would this affect performance in any way? Rather lost here. Maybe my engine builder thought it was better off without??

 

[67coupe]

At times, this has been a hotly debated topic here and on other boards.

EGR is used in low load situations to increase fuel mileage and decrease emissions. It works by allowing combusted gas into the air/fuel mixture. Since this gas is already combusted (inert), the ECU can add timing and lean out the mixture. Thus the reason for decreased emissions and increased mileage.

As long as the vacuum line was plugged (no vacuum leak) it does not affect performance negatively in anyway. When the ECU senses that the EGR is not functional (in this case), all EGR strategies are ignored. So, there is no concern for detonation.

I've had mine removed for years. I haven't noticed any detonation or decrease in fuel mileage. In my opinion, having a cleaner underhood installation and carbon free intake runners in worth removal of the EGR.

 

[7upstang91]

Thank you! I am glad to know someone else has this deleted. What you have said does make sense to me. I really wanted to make sure this was not a problem. Where exactly would your vacuum line be plugged at? I have no clue where mine is, I even looked on my other car to try to figure out where. They guy who built it does know what he is doing though. Thank you for your help!

 

[67coupe]

Borrowed from another recently posted thread...

http://www.stangnet.com/mustang-forums/807001-where-does-vacuum-line-go.html

It goes straight to those plastic vacuum line junctions (for lack of a better word).

FYI. If you plan on eliminating the actual EGR valve, you'll need one of these to prevent a check engine light.

RJM Injection Tech EGR Eliminators

 

[7upstang91]

Borrowed from another recently posted thread...

http://www.stangnet.com/mustang-forums/807001-where-does-vacuum-line-go.html

It goes straight to those plastic vacuum line junctions (for lack of a better word).

FYI. If you plan on eliminating the actual EGR valve, you'll need one of these to prevent a check engine light.

RJM Injection Tech EGR Eliminators

Oh I well might is cleaned up alittle bit more. I do know what lines you are talking about now. What are all the benefits of deleting it? Not so sure I am going to though.

 

[strtrcr50]

Oh I well might is cleaned up alittle bit more. I do know what lines you are talking about now. What are all the benefits of deleting it? Not so sure I am going to though.

A cleaner engine bay. There will be no performance gain. The egr us disabled at full throttle anyway.
If you are tested for emissions on a dyno like we are here in NJ, you might fail for nox without it.

 

[7upstang91]

A cleaner engine bay. There will be no performance gain. The egr us disabled at full throttle anyway.
If you are tested for emissions on a dyno like we are here in NJ, you might fail for nox without it.

Unfortunatly not at full throttle all the time. But I think I have decided to keep it, it ran find without it so after some research and 67s help. No emissions test here in Florida! I'm sooo screwed if we ever go back to test, have to buy a whole new exhaust for three cars then.

 

[strtrcr50]

Unfortunatly not at full throttle all the time. But I think I have decided to keep it, it ran find without it so after some research and 67s help. No emissions test here in Florida! I'm sooo screwed if we ever go back to test, have to buy a whole new exhaust for three cars then.

Under what circumstances does it stay on under full throttle? I've looked at the guf strategy and never saw anything to lead me to believe it would open under full throttle. At full throttle, you shouldn't have the required vacuum to open the valve even if the computer wanted to.

 

[fiveohwblow]

I think he was saying he doesnt always drive it at full throttle.

I have also deleted mine and noticed no difference.

 

[strtrcr50]

I think he was saying he doesnt always drive it at full throttle.

I have also deleted mine and noticed no difference.

That was my original post. There is no performance increase from deleting EGR. Only effects are a cleaner engine bay and increased part throttle combustion temps.

 

[7upstang91]

Under what circumstances does it stay on under full throttle? I've looked at the guf strategy and never saw anything to lead me to believe it would open under full throttle. At full throttle, you shouldn't have the required vacuum to open the valve even if the computer wanted to.

I thought you said no vacuum under full throttle, in my mind for some strange way I thought you implied the motor saw tons of WOT time. My bad, I apologize, I read your comment wrong.