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I Love Work'N On Hot Rods
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1,549 Posts
Discussion Starter #1
I am curious about the effects of doing an egr delete on the motor. I realize that by deleting the EGR system you remove the possibility for it to fail but what effect does removing the exhaust gases that are recirculated to the intake have on the motor performance wise??

I didnt think about these things when i did my egr delete about a year ago but what I did notice when I deleted my egr cooler, oil cooler, added a RR kit, added a spearco intercooler, and modified my 5in exhaust to go to an 8in stack was that it now appears that my truck runs at slightly higher boost levels than it did before these modifications, resulting in lower fuel economy. And by that I mean 19-20 on the hwy to 17-18 on the hwy.

So I went looking for the culprit and the only thing that seems to make any sense of what could cause this was the deletion of the egr system.

My theory (and I would like your input) is that since the EGR system is gone the engine now requires more air to get the same power recipe (mixture of air, fuel, and whatever else) as before the delete. It has been proven already that diesel engines respond very well to just about any type of fuel augmentation; whether it be propane, water/meth, nitrous (more air), natural gas, or even gasoline (check diesel power mag).

So I am thinking that the recirculation of exhaust gases, in a way, acted like a type of fuel augmentation and when I deleted that, I in turn lost some performance. What are your guys' thoughts on this??
 

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Almost broke
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67 Posts
Would you think moding your exhaust would be more of the culprit than egr? Reduction in backpressure ?

I do remember seeing something where egr does improve motor efficiency, but I don’t know where.
 

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Haters Gonna Hate
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5,869 Posts
how can running burnt/spent exhaust gasses back through the manifold create a more efficient burn? as far as i can tell from being a mechanic and studying the engines i have worked on the more fresh air and fuel that is put into the cylinder the more efficient the cylinder comes.... reburning burned gasses would be rather effiicient if you weren't looking to help the motor do its job.... making HP
 

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I Love Work'N On Hot Rods
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1,549 Posts
Discussion Starter #4
I asked this question over on the org and here is the link to what i got for an answer. It doesnt agree with my theory so I guess my theory is crap and I agree with you as well. I was just trying to see what everyone's opinion was and see how it lined up with mine. Never claimed to be right just want to see what everyone thought.

EGR Delete Question?? - Ford Powerstroke Diesel Forum
 

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76 Posts
I gained a solid 1.5 mpg on the hwy, hand calculated, after my EGR delete, I've never heard of anyone else losing mpg from it, unless it's because they can't keep their foot out of it.
 

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Super Moderator
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3,401 Posts
The intent of the EGR was to lower emissions by burning off deposits in the exhaust gases. My thoughts would be the makeup of the air/exhaust has changed from an 02 rich source to an O2 depleted source. Being that you need Fuel/Air/Heat to make energy you need O2 more than CO2.
 
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