Egr is it worth blocking it
April-4th-2003, 06:28 AM
#16
Protege Anarchist
Join Date: Sep 2001
Location: Dallas, TX
Posts: 708
it is computer controlled on our cars
Originally posted by rodslinger
One thing to note is the EGR is operated off vacuum which is usually only present in the manifold during idle, decel and light cruise. During medium to full accelleration there isn't enough vacuum to open the EGR and the computer won't call for it anyway. Blocking it off will net you 0 extra horsepower.
One thing to note is the EGR is operated off vacuum which is usually only present in the manifold during idle, decel and light cruise. During medium to full accelleration there isn't enough vacuum to open the EGR and the computer won't call for it anyway. Blocking it off will net you 0 extra horsepower.
April-4th-2003, 07:26 AM
#17
P.A.C.T / P.A.APC Member
Join Date: Nov 2001
Location: Smyrna, GA
Posts: 269
Originally posted by TheMAN
it is computer controlled on our cars
it is computer controlled on our cars
April-4th-2003, 08:23 AM
#18
Protege Enthusiast
Join Date: Nov 2001
Location: Merritt Island Fl
Posts: 151
Running without the EGR will cause the cats to quickly clog, thus reducing exhaust flow and increasing back pressure. Power will be lost. The EGR does not open at idle or high throttle settings and doesn't rob power. The one thing it does do is mess up the intake manifold with carbon deposites, and in a worst case the intake valve seats, but if things get that bad there is another problem else where.
Years ago when the EGR control wasn't as refined (vacuum operated) as it is today it was common to disconnect it and see some gains, but not anymore. My advice is unless you've removed all the cats for all out racing leave it alone.
Years ago when the EGR control wasn't as refined (vacuum operated) as it is today it was common to disconnect it and see some gains, but not anymore. My advice is unless you've removed all the cats for all out racing leave it alone.
April-4th-2003, 10:09 AM
#20
P.A.C.T / P.A.APC Member
Join Date: Nov 2001
Location: Smyrna, GA
Posts: 269
Originally posted by zeus
Running without the EGR will cause the cats to quickly clog, thus reducing exhaust flow and increasing back pressure.
Running without the EGR will cause the cats to quickly clog, thus reducing exhaust flow and increasing back pressure.
April-6th-2003, 12:47 AM
#22
Guest
Posts: n/a
here goes
when you start your car and the engine is cold, its runs EXTREMELY rich and there is alot of gas that is not combusted coming out of the engine, so while idling the tube coming off the header goes back into the intake manifold and it gets burned again. this does 2 things, one better emissions b/c everything is getting used up and not clogging your cats and second, it helps with not wasting gas. sounds retarded and not all cars have it, but its there. if you disconnect it, the its gona suck in air, not gas/air so the engine will start running lean and cause the ecu to go WTF and do wierd things. but sometimes it runs fine
when you start your car and the engine is cold, its runs EXTREMELY rich and there is alot of gas that is not combusted coming out of the engine, so while idling the tube coming off the header goes back into the intake manifold and it gets burned again. this does 2 things, one better emissions b/c everything is getting used up and not clogging your cats and second, it helps with not wasting gas. sounds retarded and not all cars have it, but its there. if you disconnect it, the its gona suck in air, not gas/air so the engine will start running lean and cause the ecu to go WTF and do wierd things. but sometimes it runs fine
April-6th-2003, 01:02 AM
#23
Protege Anarchist
Join Date: Sep 2001
Location: Dallas, TX
Posts: 708
beep!!!!! wrong answer!
EGR should and is NEVER EVER enabled at idle. Doing so will RICHEN the AFR so much it WILL stall the engine. EGR's ONLY function is to reduce NOx emission during light/medium load crusing conditions. The EGR opens its valve under those conditions and allows a bit of exhaust gas to recirculate back into the intake system. It does not "reburn" anything, all it does is dilute the intake charge's air which will in effect reduce the combustion chamber's temperature levels. Hot combustion chambers are the primary cause of NOx emissions.
Originally posted by walight01
here goes
when you start your car and the engine is cold, its runs EXTREMELY rich and there is alot of gas that is not combusted coming out of the engine, so while idling the tube coming off the header goes back into the intake manifold and it gets burned again. this does 2 things, one better emissions b/c everything is getting used up and not clogging your cats and second, it helps with not wasting gas. sounds retarded and not all cars have it, but its there. if you disconnect it, the its gona suck in air, not gas/air so the engine will start running lean and cause the ecu to go WTF and do wierd things. but sometimes it runs fine
here goes
when you start your car and the engine is cold, its runs EXTREMELY rich and there is alot of gas that is not combusted coming out of the engine, so while idling the tube coming off the header goes back into the intake manifold and it gets burned again. this does 2 things, one better emissions b/c everything is getting used up and not clogging your cats and second, it helps with not wasting gas. sounds retarded and not all cars have it, but its there. if you disconnect it, the its gona suck in air, not gas/air so the engine will start running lean and cause the ecu to go WTF and do wierd things. but sometimes it runs fine
i just went off what was told to me from a under the tree machanic.
April-16th-2003, 09:10 PM
#29
Registered User
Join Date: Feb 2002
Location: central coast calif.
Posts: 260
removing your EGR will do nothing but cause your engine to need higher octane fuel due to pre-ignition due to the higher combustion chamber temps. it will not add or take away any useable HP. as "the man" mentioned it only is working when the engine is under a light load, such as cruising the freeway at a constant speed. if you step on the gas the EGR turns off. it is also off when you are accelerating.
Thread
Thread Starter
Forum
Replies
Last Post
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)