EGR - Non-EGR, Does It Make Any Difference
Thread Starter
Instructor
Joined: Feb 2011
Posts: 205
Likes: 0
From: Laquey Missouri
EGR - Non-EGR, Does It Make Any Difference
Cleaning the motor yesterday, I notice that the intake gasket is missing in the front. So, I'm pulling it to repair and thought I'd change the intake to a Edelbrock Performer 2101. Does it make any difference if I use the EGR or Non-EGR Intake? I don't have to worry about emissions testing?
Drifting
Joined: Aug 2009
Posts: 1,635
Likes: 8
From: Enid Oklahoma
Cleaning the motor yesterday, I notice that the intake gasket is missing in the front. So, I'm pulling it to repair and thought I'd change the intake to a Edelbrock Performer 2101. Does it make any difference if I use the EGR or Non-EGR Intake? I don't have to worry about emissions testing?
Le Mans Master
Joined: Jun 2004
Posts: 6,231
Likes: 65
From: Seattle WA
St. Jude Donor '14
If it's required by inspection, then it's a must-have. Otherwise, leaving it out just cleans up the plumbing.
+1 as well on front/rear valley gaskets - never use them.
Drifting
Joined: Aug 2009
Posts: 1,635
Likes: 8
From: Enid Oklahoma
But the fugly EGR valve that sits atop a motor does nothing but allow crap into the engine, thats what it is made to do. I wouldn't dare to say performance suffers by having one on, but efficiency does not always equal performance, plus they look way better without one. Again my opinion.
Le Mans Master
Joined: Oct 2007
Posts: 7,455
Likes: 977
From: RI, Now Franklin/Nashville TN
Thank goodness the so called documented efforts on this forum are so infallable. But the fugly EGR valve that sits atop a motor does nothing but allow crap into the engine, thats what it is made to do. I wouldn't dare to say performance suffers by having one on, but efficiency does not always equal performance, plus they look way better without one. Again my opinion.
But the fugly EGR valve that sits atop a motor does nothing but allow crap into the engine, thats what it is made to do. I wouldn't dare to say performance suffers by having one on, but efficiency does not always equal performance, plus they look way better without one. Again my opinion.
The last time I was in a conversation on the forum and the word documented came up, the documentation was so and so said this or read that but there was NO REAL Documentation! Let's try some common sense on this one! If the choice is to allow unburned, superheated hot gases back into the combustion chamber diluting clean fresh air for combustion at high vacuum or not having any of these events occurring in your engine, which one would you choose if you are looking for the highest combustion efficiency, lowest risk of detonation, the better running engine? Hint: it would NOT be running an EGR valve-they serve one purpose only-reduce emissions! Like everything else in life, there is NO free ride-reduce emissions at the tradeoff of what?
Last edited by jb78L-82; Jul 24, 2011 at 10:50 AM.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Le Mans Master
Joined: Jun 2004
Posts: 6,231
Likes: 65
From: Seattle WA
St. Jude Donor '14
So...honestly...it doesn't take a lot of "documentation" to figure this one out
Now...at low and low-mid throttle, certainly you end up with a more dilute charge and some small impact on power output. But if you're looking for power output, you're not spending much time at low and low-mid throttle, are you?
Le Mans Master
Joined: Oct 2007
Posts: 7,455
Likes: 977
From: RI, Now Franklin/Nashville TN
Correct! I edited my mistake above and yes the impact is miminal at mid to high vacuum but the question remains for the best running engine, power aside, which one would you rather have, running an EGR valve-diluting incoming air mixture with superheated polluted air or not? Unless you need the EGR valve for emissions inspection, I would and do NOT have it. My stock L-82 ran like crap (rough idle), ran VERY hot, and detonated at mid to high vacuum situations until I eliminated the EGR valve, heat riser valve, idle mixture screw limits, AIR pump and associated hardware, the cat, and lowered the operating temperature of the engine. Yes, the EGR valve is just one component of many that can effect the driveability of your car, but if the choice is eliminate one or more-I vote to go for it on these early emissions engines. Newer cars are a totally different story-My 94 Mustang GT has every piece of emissions control on it and runs like a champ. There is no reason to eliminate this equipment on modern cars-that is the key-no reason since driveability is excellent to begin with. I would not touch any of this stuff on my 2010 Z06-NO Reason to. Not so on the emissions C3's-It's all junk.
Race Director
Joined: Apr 1999
Posts: 11,520
Likes: 13
From: CORVETTE 77 385 C.I. TEXAS
The stock non-performance guys probably spend the most time at low throttle or maybe pushing it around!
Last edited by Ganey; Jul 24, 2011 at 11:09 AM.
Burning Brakes
Joined: Jan 2007
Posts: 1,057
Likes: 4
From: Concord Calif
While an EGR valve has no impact on power on low vacuum running, it does make it a bit difficult in tunning at cruise. They often will give you a lean surge at cruise when the engine is leaned down as the intake charge is now displaced with exhast gases instead of fuel/air. Tuning becomes a problem because of the leanner settings on your carb jetting needed to get the engine to run ok and then still have the fuel it needs at high loads. It can be done though but not easy, Not everyone will be bothered by the way an engine runs with an EGR set up on a well tunned engine. Get rid of it if not needed for emissions testing! my .50cents.
Le Mans Master
Joined: Oct 2010
Posts: 6,938
Likes: 848
From: melbourne florida
2023 C3 of the Year Finalist - Modified
the e.g.r valve not effecting performance is based solely on a properly opperating system, which is not common.if it isn't needed for inspection it can be a good paperweight.
Racer
Joined: Nov 2004
Posts: 485
Likes: 1
From: Oakville ON
I tuned my carb to get best mileage at cruise (with EGR). Then it started acting funky at different times. Disconnected the EGR w/o any other changes and it has run great ever since.
