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01-02-06, 04:03 PM
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#1 (permalink)
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Member
Join Date: Aug 2005
Location: Dandenong,victoria-Australia
Posts: 254
My Corvette(s):
1991 ZO7 coupe, 6 speed,red on red w/most options!
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" can i remove (egr) valve at all?"
hi there guys,
just wandering is there any performance gain at all bye removing "egr valve" annnnnd pipes completely from engine?
what is the role of the "egr" valve any way?
should i do this at all?
any ideas if i should do this on what or how to go about doing it?
thanks
glen
sxyvet
Australia
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01-02-06, 04:09 PM
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#2 (permalink)
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Member
Join Date: May 2003
Location: South Bend,IN
Posts: 2,226
My Corvette(s):
86 Black Vert "Indy 500 Pace car replica"
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I have the block off plate on mine, not sure if there are any imporvement in performance or not.
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Mods to date:
383 Stroker(Eagle Rotating Assembly), comp cam, ported heads,5 angle vavle job,,Cat Back, larger intake and exhaust valves, ported plenum, Ported and siamesed runners, Big Mouth Manifold with EGR delete,TPIS Long Tube Headers, Holley AFPR, MSD 6AL, MSD coil, MSD 8.5mm wires, 30# injectors,255 LPHWalbro fuel pump, Vortex Ram Air, Air Foil, MAT Relocation kit, TB Bypass,Heated 02,2400 RPM stall torque converter, Pioneer Head unit, Infinity speakers.
Mods soon to come:
3.73 rear gears.
Other vehicles:
1973 Bucaneer Red Pontiac Trans Am 455 w/4sp
1971 Starlite Black Pontiac Formula 455 auto w/air.
2004 Victory Red Chevy Silverado Z71 5.3
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01-02-06, 05:00 PM
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#3 (permalink)
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Member
Join Date: Dec 2004
Location: Memphis, TN
Posts: 53
My Corvette(s):
'95 Torch Red Coupe
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"EGR" Exhaust Gas Recirculation . . . part of smog equipment. American cars have had them for years, and they have always caused problems, mainly in the form of vacuum leaks.
I have seen no performance gains by removing them, unless your engine is absolutely fine-tuned and yer running at 9000 RPM at Bonneville . . .
Conversely, I have seen no performance losses due to removal of those pesky gadgets. I am not sure of your local Environmental Protection Agency rules, but here their EPA Nazis take a dim view of messing with any polution controls.
Check the forum regarding polution controls in the C-4 area.
V/R, Gary
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01-02-06, 08:09 PM
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#4 (permalink)
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Member
Join Date: Nov 2005
Location: oneida,ny
Posts: 306
My Corvette(s):
86 coupe
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most EGR equipped cars have fuel/spark maps in ecm screwed up to correlate with EGR in cruise modes...disconnecting the egr often will cause the engine to run noticeably warmer
egr is (should be) off at idle,tps switch signalling closed throttle, and at WOT (above 3/4 tps position)...hard to detect normal ops
some gm ecm's (i don't think yours) self initiate a test of egr function during road cruise conditions and lite MIL if no egr response occurs
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01-02-06, 08:27 PM
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#5 (permalink)
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Member
Join Date: Mar 2002
Location: delmont pa
Posts: 799
My Corvette(s):
2008 Crystal Red Tint Coat
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Quote:
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Originally Posted by sxyvet
hi there guys,
just wandering is there any performance gain at all bye removing "egr valve" annnnnd pipes completely from engine?
what is the role of the "egr" valve any way?
should i do this at all?
any ideas if i should do this on what or how to go about doing it?
thanks
glen
sxyvet
Australia
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it could cause "pinging" because the exhaust gas lowers the combustion temps and higher temp could cause "pinging"
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retired race engine builder,former NASCAR tech inspector,corvette owner since 1959, new corvettes owned,59,62,63,64,65,66,97,99,02,05, 2008 is in my garage
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01-02-06, 09:52 PM
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#6 (permalink)
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Supporting Member
Join Date: Mar 2001
Location: Boston, MA area
Posts: 672
My Corvette(s):
jewel blue 61.cranberry 69 t-top.black rose 92
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the newer cars are designed to have ege introduced to the combustion chamber . If it is defeated you will have spark knock and the knock sensor will retard the timing with a resulting poorer engine performance and gas milage. the only way to defeat it is to have a new prom made with that figured in, IMHO leave it functional hate to sound like a tree hugger because I am not but it is better for the the air and your car over all Steve
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ase,gmc,olds,master tech and L1 certifed
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01-02-06, 09:57 PM
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#7 (permalink)
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Member
Join Date: Aug 2005
Location: Dandenong,victoria-Australia
Posts: 254
My Corvette(s):
1991 ZO7 coupe, 6 speed,red on red w/most options!
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hi there guys,
thanks for that great info!
i will just leave the sucker alone and intact then!
thanks
have a good night guys!
cheers
glen
sxyvet
Australia
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01-02-06, 11:40 PM
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#8 (permalink)
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Member
Join Date: Mar 2005
Location: Summerland, B.C. Canada
Posts: 170
My Corvette(s):
86 4+3 Coupe-Yellow
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I don't miss mine  and i sure like the easy valve cover removal 
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01-02-06, 11:53 PM
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#9 (permalink)
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Supporting Member
Join Date: Aug 2001
Location: Chicago
Posts: 8,204
My Corvette(s):
1988 35th Anniversary Edition #0497/2050
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Like the others have said, if you take the EGR off, the CEL will be on if you don't tell the brains that it's not there anymore because the brains assume that it's still there.
Pretty much everyone says that the EGR basically does nothing for emissions.
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Edmond.
Contact me for the best prices on Amsoil.
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01-03-06, 01:58 AM
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#10 (permalink)
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Member
Join Date: Aug 2005
Location: Dandenong,victoria-Australia
Posts: 254
My Corvette(s):
1991 ZO7 coupe, 6 speed,red on red w/most options!
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Quote:
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Originally Posted by Edmond
Like the others have said, if you take the EGR off, the CEL will be on if you don't tell the brains that it's not there anymore because the brains assume that it's still there.
Pretty much everyone says that the EGR basically does nothing for emissions.
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hi edmond,should i take the egr valve off then?
or just leave it!
thanks
glen
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01-03-06, 08:28 AM
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#11 (permalink)
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Supporting Member
Join Date: Aug 2001
Location: Chicago
Posts: 8,204
My Corvette(s):
1988 35th Anniversary Edition #0497/2050
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If you get a PROM burned to turn the SES light off, go ahead and take the EGR off. If you don't get a PROM burned to turn off the SES light, leave the EGR on. It neither hurts or helps but it is a nuisance when something goes wrong with it. In fact, many places sell L98 intake manifolds with the EGR blocked off. I guess it's less problems to go wrong with the car!
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Edmond.
Contact me for the best prices on Amsoil.
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01-03-06, 05:44 PM
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#12 (permalink)
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Member
Join Date: Aug 2005
Location: Dandenong,victoria-Australia
Posts: 254
My Corvette(s):
1991 ZO7 coupe, 6 speed,red on red w/most options!
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hi again,
i will leave it on then till i get my new prom then!
thanks man
appreciate all your comments!
cheers
glen
sxyvet
Australia
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01-03-06, 08:43 PM
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#13 (permalink)
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Supporting Member
Join Date: Mar 2001
Location: Boston, MA area
Posts: 672
My Corvette(s):
jewel blue 61.cranberry 69 t-top.black rose 92
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the emissions that is deminished by the egr valve are nitrous oxides that contribute to smog . If you need to pass a sniff test it my not pass unless your cats are in real good shape IMHO I would leave the system intact unless you are going to highly modify the corvette. I feel you would benifit in the long run with lower combustion temps and the possability to bump up the timing for better performance with premium fuel Steve
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01-03-06, 10:17 PM
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#14 (permalink)
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Member
Join Date: Aug 2005
Location: Dandenong,victoria-Australia
Posts: 254
My Corvette(s):
1991 ZO7 coupe, 6 speed,red on red w/most options!
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Quote:
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Originally Posted by bradfordsvettes
the emissions that is deminished by the egr valve are nitrous oxides that contribute to smog . If you need to pass a sniff test it my not pass unless your cats are in real good shape IMHO I would leave the system intact unless you are going to highly modify the corvette. I feel you would benifit in the long run with lower combustion temps and the possability to bump up the timing for better performance with premium fuel Steve
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hi steve,
thanks for the reply and info mate!
cheers
glen
sxyvet
Australia
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