8.1L EGR Delete - Diesel Place : Chevrolet and GMC Diesel Truck Forums
 
Home Forum Market Place Garage Tuning Library DTC Tool Register Vendors
Go Back   Diesel Place : Chevrolet and GMC Diesel Truck Forums > Other Vehicles > GM Gassers
Register FAQ Forum Rules My Replies My Threads Mark Forums Read Advertise

GM Gassers Discuss any of the GM gas engines & associated components.

DieselPlace.com is the premier Duramax Diesel Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools
Old 08-02-2010, 10:03 PM   #1 (permalink)
406jeep
Heat Sink
 
Join Date: Apr 2009
Posts: 10
iTrader Score: 0 reviews

8.1L EGR Delete

I have an 8.1L going into a rock buggy, and I am deleting the EGR valve and tubing and cleaning up the harness.

I assume I should just make a blank plate and close off the EGR opening.

No need to add a breather in the blank plate with the internal PCV system built into the Intake, right?

Offline  
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 08-03-2010, 02:34 PM   #2 (permalink)
Brad92
Diesel Guru
 
Brad92's Avatar
 
Join Date: Oct 2008
Location: College Station, Texas
Posts: 7,943
iTrader Score: 0 reviews
Send a message via Yahoo to Brad92

The only reason you would need to add a hole in the plate (turning it into a restrictor plate, not a blocker plate) would be to basically block the EGR without a CEL if you left the electrical hooked up.

I would suggest looking at Ebay, as they sell blocker kits for other vehicles that include the plate, and the fittings to block off the tubing...

__________________
2001.5 QCLB 24v Cummins NV5600 4x4
Sponsored by Ranchó Handó™
Reg Cab Member #105
Young and Poor Club Member #18
Offline   Reply With Quote Quick reply to this message
Old 08-03-2010, 07:58 PM   #3 (permalink)
JRayls2500hd
Diesel Apprentice
 
JRayls2500hd's Avatar
 
Join Date: Aug 2008
Location: Marshall MO
Posts: 367
iTrader Score: 0 reviews

not judging because im really asking what would be the benefit of this???
__________________
Rayl Pulling Team

Brotherhood Of HandShakers Proud Member 165
2003 Chevy Reg 4X4 8.1 ZF6
1989 Chevy Reg 4X4 5.7 2500
1932 Chevy Coupe 2400 HP
2006 Chevy 3500 Dually 4x4 DMax

Offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 08-03-2010, 10:30 PM   #4 (permalink)
Manic Mechanic
Diesel Boss
 
Manic Mechanic's Avatar
 
Join Date: Mar 2006
Location: Magnolia, TX
Posts: 1,016
iTrader Score: 0 reviews

Quote:
Originally Posted by JRayls2500hd View Post
not judging because im really asking what would be the benefit of this???
Did you miss this part: "I have an 8.1L going into a rock buggy, and I am deleting the EGR valve and tubing and cleaning up the harness."
1. Who wants an EGR to stick open and kill the engine when way out on the rocks where you can't get a tow.
2. It's not a highway vehicle so it doesn't need emissions reduction equipment along with their added complexity and pro tensity to cause unnecessary problems.
3. Can make the 8.1 fit in a smaller engine bay by reducing size of upper engine.
4. Less wiring to run on a custom harness.
5. Less to tune around.

No breather needed, just block it off.

Vernon
__________________
2001 Siverado 2500 HD SBCC in Black
GM Vortec 8100, Allison, 4.56's, 4X4, Dodge style limited slip rear diff, Eaton E-Locker front diff, GM O/D Lock-out button kit.
Go mods: HP Tuners, E85 fueled, Volant, BBK 80mm TB, Marine Injectors, Bosch Fusion Iridium Plugs, Magnaflow 3" dual in X-path dual out, BFG 315/70-17 on H2's, Velvet Ride Shackles, Helwig rear anti-sway bar. Complete frame up front end rebuild with Cognito: Leveling Kit, HD tie-rods, P&I arm braces, sway-bar links. Rancho shocks, Energy suspension control arm bushings.
Show mods: Goodmark SS cowl hood, Black Diamond plate: Ranch Hand bumpers, toolbox, and bed rails. Pocket Flares.
Offline   Reply With Quote Quick reply to this message
Old 08-09-2010, 05:12 PM   #5 (permalink)
JRayls2500hd
Diesel Apprentice
 
JRayls2500hd's Avatar
 
Join Date: Aug 2008
Location: Marshall MO
Posts: 367
iTrader Score: 0 reviews

is their any hp increase to this?
__________________
Rayl Pulling Team

Brotherhood Of HandShakers Proud Member 165
2003 Chevy Reg 4X4 8.1 ZF6
1989 Chevy Reg 4X4 5.7 2500
1932 Chevy Coupe 2400 HP
2006 Chevy 3500 Dually 4x4 DMax

Offline   Reply With Quote Quick reply to this message
Old 08-09-2010, 05:28 PM   #6 (permalink)
Detox
Banned
 
Join Date: Apr 2010
Posts: 119

^^^^^ What he said
Offline   Reply With Quote Quick reply to this message
Old 08-10-2010, 08:03 AM   #7 (permalink)
Manic Mechanic
Diesel Boss
 
Manic Mechanic's Avatar
 
Join Date: Mar 2006
Location: Magnolia, TX
Posts: 1,016
iTrader Score: 0 reviews

No HP increase. If the EGR is working properly it will only function at part throttle cruise when there is no need for acceleration or power above maintaining a light load. If it's not working properly you have bigger problems like 406Jeep is trying to avoid with his rock buggy.

Modern emission controls are progressed to the point that there is little of the HP loss of 30 years ago. Converters are as free flowing as necessary and even compression ratios are back up to the limits of unleaded fuel. Nowadays many Hyundai's and V6 pony cars sport 300 HP from small engines and if you think you'll just block this or cut off that and get a significant increase in power you're overly optimistic. If you think about it cars and trucks are fast from the factory again. You'll have to go for hard parts to make major gains, like cams or power adders.

Vernon
__________________
2001 Siverado 2500 HD SBCC in Black
GM Vortec 8100, Allison, 4.56's, 4X4, Dodge style limited slip rear diff, Eaton E-Locker front diff, GM O/D Lock-out button kit.
Go mods: HP Tuners, E85 fueled, Volant, BBK 80mm TB, Marine Injectors, Bosch Fusion Iridium Plugs, Magnaflow 3" dual in X-path dual out, BFG 315/70-17 on H2's, Velvet Ride Shackles, Helwig rear anti-sway bar. Complete frame up front end rebuild with Cognito: Leveling Kit, HD tie-rods, P&I arm braces, sway-bar links. Rancho shocks, Energy suspension control arm bushings.
Show mods: Goodmark SS cowl hood, Black Diamond plate: Ranch Hand bumpers, toolbox, and bed rails. Pocket Flares.
Offline   Reply With Quote Quick reply to this message
Old 08-16-2010, 05:51 PM   #8 (permalink)
jmccart
Diesel Fanatic
 
Join Date: Jan 2007
Posts: 129
iTrader Score: 0 reviews

So, if you put a lil' plate w/a small hole drilled in the center, there will be no CEL? How big does the hole have to be?

Thanx.
__________________
2003 Silverado CCSB 8.1 Allison 4.10's 2x4, Diablo/Predator, Flowmaster muffler replacement, 160 stat, 41-932 plugs, Blackbear ECM coming
Offline   Reply With Quote Quick reply to this message
Old 08-16-2010, 10:14 PM   #9 (permalink)
Manic Mechanic
Diesel Boss
 
Manic Mechanic's Avatar
 
Join Date: Mar 2006
Location: Magnolia, TX
Posts: 1,016
iTrader Score: 0 reviews

The PCV (Positive Crankcase Ventilation) system, internal or external, and the EGR (Exhaust Gas Recirculation) system are two completely different and unrelated systems.

If you make an EGR block off plate with a small hole and install it between the EGR valve and the EGR port you will likely get a code for EGR system malfunction. The PCM comands the EGR valve open then looks for a change in O2 Sensor readings to verify the valve is open and flowing inert exhaust gas into the air and fuel charge dilluting the Oxegen level. If there is little to no change in O2 readings after the valve is opened it sets a code for the malfunctioning emmission control.

Now if you were to make a block off plate for the EGR valve port and leave the valve off like I think Jeep was asking you would not make a PCV breather hole, just an exhaust leak. The PCV system doesn't use exhaust gas to flush unburned HC's and exhaust gasses out of the crankcase. It uses fresh air pulled from a metering oriface in the intake itself, fresh filtered air to flush out unburned fuel and exhaust gasses that get past the rings. The EGR ports are plumbed to the exhaust manifolds and nothing else.

When the EGR valve is open it allows previously burned and now inert exhaust gasses into the intake air/fuel charge. This slows down the burn rate and peak temperatures of the combustion in each cylinder, thereby reducing NOX (Nitrited Oxegen). To much EGR means a lean misfire, too little means high NOX. It also raises the pressure in the intake without increasing power, this reduces pumping losses and increasing fuel efficiency. It also dillutes the charge in each cylinder but if regulated properly still allows enough Oxegen and fuel to burn evenly, thereby chemically reducing displacement and increasing fuel efficiency.

All of this is at part throttle cruise only. It doesn't work when maximum power and displacement are needed as it reduces both. So under heavy load or any load above cruising it shuts so power can be made efficiently.

At idle the charge is so small that almost any additional EGR above naturally occuring backflow during intake and exhaust valve timing overlap would cause a lean misfire and kill the egine if it affected enough cylinder firings. You can't burn what's left of air, nitrogen, after the oxegen has been burned out of it. So the valve is always supposed to be shut at idle also.

Vernon
__________________
2001 Siverado 2500 HD SBCC in Black
GM Vortec 8100, Allison, 4.56's, 4X4, Dodge style limited slip rear diff, Eaton E-Locker front diff, GM O/D Lock-out button kit.
Go mods: HP Tuners, E85 fueled, Volant, BBK 80mm TB, Marine Injectors, Bosch Fusion Iridium Plugs, Magnaflow 3" dual in X-path dual out, BFG 315/70-17 on H2's, Velvet Ride Shackles, Helwig rear anti-sway bar. Complete frame up front end rebuild with Cognito: Leveling Kit, HD tie-rods, P&I arm braces, sway-bar links. Rancho shocks, Energy suspension control arm bushings.
Show mods: Goodmark SS cowl hood, Black Diamond plate: Ranch Hand bumpers, toolbox, and bed rails. Pocket Flares.

Last edited by Manic Mechanic; 08-16-2010 at 10:17 PM.
Offline   Reply With Quote Quick reply to this message
Old 09-16-2010, 12:45 PM   #10 (permalink)
turbodieselesq
Self Ignition
 
Join Date: Aug 2009
Posts: 83
iTrader Score: 0 reviews

After reading the thread - do anyone know for sure if the CEL will trip if the egr tube is disconnected? I have a bad exhaust manifold and moving to headers as a cheaper alternative - but research is showing that they probably don't have a provision for the egr tube. One thought was to use a block off plate with a small hole as previously discussed. Does this work?

__________________
***SOLD*****1993 GMC SIERRA Crew Cab 4X4
6.5TD Freshly Rebuild - standard bore

NEWLY ACQUIRED - 2003 CC 2500HD 8.1/Allison
"Got gas and not looking back!"

2005 Hummer H2 - maxxed out!
Offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Diesel Place : Chevrolet and GMC Diesel Truck Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

PLEASE READ! You must check your email inbox for the confirmation link to complete registration. Please check your spam box if you do not see the email in your inbox.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in


Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Cat delete? EGR delete? PVC re route? 05duramaxguy Fuel System, Air, Exhaust, & Emissions Upgrades 4 11-19-2010 10:09 PM
Cat delete or Muffler delete First? cam813 Fuel System, Air, Exhaust, & Emissions Upgrades 1 02-05-2010 11:34 AM
dpf delete bungo Fourth Generation Duramax Electronics/Tuners 0 08-07-2009 08:14 AM
stock gutted cat, muffler delete vs. aftermarket cat delete/catback uReside Fuel System, Air, Exhaust, & Emissions Upgrades 3 08-23-2005 10:02 AM


All times are GMT -4. The time now is 12:33 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Shoutbox provided by vBShout v6.2.1 (Lite) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd. Runs best on HiVelocity Hosting.
© AutoGuide