xtremerevolution Posted June 5, 2008 Report Share Posted June 5, 2008 That little round cylinder in my engine bay. Do I need it? I did some research on it and it doesn't seem to be serving much of a good purpose other than reducing emissions, and from what I can tell, vehicles 1995 and older in Illinois don't need to pass emissions. Is there really a benefit to recirculating exhaust back into the intake? I'd much rather plug it up and call it a day. What would happen if I just took the thing off, disconnected it, and plugged up the hole? Quote Link to comment Share on other sites More sharing options...
95 vert Posted June 5, 2008 Report Share Posted June 5, 2008 Check engine lite of course. Possible detonation problems with higher intake temp. Quote Link to comment Share on other sites More sharing options...
xtremerevolution Posted June 5, 2008 Author Report Share Posted June 5, 2008 Check engine lite of course. Possible detonation problems with higher intake temp. I've got a 180 degree t-stat if that would help anything. I'm wondering if it would even improve performance at all... One of the reasons I'm asking this is because the earlier generation L27's didn't even have this IIRC. Quote Link to comment Share on other sites More sharing options...
Hal H Posted June 6, 2008 Report Share Posted June 6, 2008 EGR mainly operates under part-throttle cruise conditions. The inert gas reduces combustion temps = lower NOx emissions. Under WOT / high loads the EGR usually cuts off as the system goes into rich mode of operation. Not likely to notice any differance in performance. Quote Link to comment Share on other sites More sharing options...
runt Posted June 6, 2008 Report Share Posted June 6, 2008 You could probably make your own block off plate for very little. Quote Link to comment Share on other sites More sharing options...
spiderw31 Posted June 6, 2008 Report Share Posted June 6, 2008 If you block it off, you should have a lot less carbon buildup in your intake, since there is no exhaust travelling through it. EGR mainly operates under part-throttle cruise conditions. The inert gas reduces combustion temps = lower NOx emissions. This is true, and it is the lower combustion temps that reduce the chance of pinging. If you do block it off, listen VERY carefully for pinging. If you hear it, either put the EGR back in, or run higher octane fuel. Also, no EGR will cause a bit of a fuel milage drop, so YMMV (pun intended ). Quote Link to comment Share on other sites More sharing options...
per0781 Posted June 6, 2008 Report Share Posted June 6, 2008 remove it. it's all about reducing the weight of the car Quote Link to comment Share on other sites More sharing options...
xtremerevolution Posted June 6, 2008 Author Report Share Posted June 6, 2008 remove it. it's all about reducing the weight of the car QFT!!! That thing weighs like what, 2 pounds? Every little bit helps. If you block it off, you should have a lot less carbon buildup in your intake, since there is no exhaust travelling through it. EGR mainly operates under part-throttle cruise conditions. The inert gas reduces combustion temps = lower NOx emissions. This is true, and it is the lower combustion temps that reduce the chance of pinging. If you do block it off, listen VERY carefully for pinging. If you hear it, either put the EGR back in, or run higher octane fuel. Also, no EGR will cause a bit of a fuel milage drop, so YMMV (pun intended ). How much of a fuel mileage drop should I expect? And I certainly wouldn't mind preventing the carbon build-up inside my engine as a result of recirculating exhaust. My engine runs pretty cold as it is, so I doubt I'd have any of the mentioned problems. With those hood vents, tranny cooler, and 180 degree t-stat, I should be good to go. I'll go ahead and try this. I just figured this whole time that its probably doing more harm than good and that I could probably do just as well without it. One less accessory makes the car that much easier to work on. Quote Link to comment Share on other sites More sharing options...
pontiacmaniac94 Posted June 6, 2008 Report Share Posted June 6, 2008 okay, heres the deal. if your car is OBDI, just make a block off plate for it, and KEEP it on the car.....plug it back in. that way the computer still THINKS it is working, and no codes will be thrown..and you might get a 2-4 mpg drop on the highway, that is about the only time it functions, and around town, it should be less noticable. Quote Link to comment Share on other sites More sharing options...
Brian P Posted June 6, 2008 Report Share Posted June 6, 2008 we're not talking operating temperature, we're talking combustion temp, which won't be swayed by a 10 degree drop of coolant. Other 3800's didn't get it but they might have had other provisions (such as the cam having a different profile, more valve overlap which can cause a natural constant EGR). Food for thought. It really isn't hurting much being there. Quote Link to comment Share on other sites More sharing options...
digitaloutsider Posted June 6, 2008 Report Share Posted June 6, 2008 The early L27's also had a problem with chipping pistons, so keep that one in mind. The car is going to always be slow, why bother even messing with the EGR? What gains you do get (if any) are not going to be noticeable in any way, shape or form. (And I'm not trying to be an asshole, just trying to be honest here) Quote Link to comment Share on other sites More sharing options...
Brian P Posted June 6, 2008 Report Share Posted June 6, 2008 The early L27's also had a problem with chipping pistons, so keep that one in mind. The car is going to always be slow, why bother even messing with the EGR? What gains you do get (if any) are not going to be noticeable in any way, shape or form. wait... so who is this? Quote Link to comment Share on other sites More sharing options...
spiderw31 Posted June 6, 2008 Report Share Posted June 6, 2008 we're not talking operating temperature, we're talking combustion temp, which won't be swayed by a 10 degree drop of coolant. Other 3800's didn't get it but they might have had other provisions (such as the cam having a different profile, more valve overlap which can cause a natural constant EGR). Food for thought. It really isn't hurting much being there. ^ What he said. The early L27's also had a problem with chipping pistons, so keep that one in mind. ^ Haven't heard that before, but if it is true, then If it were me I'd leave it on. wait... so who is this? Serious question? I think it's DigitalOutsider. Quote Link to comment Share on other sites More sharing options...
Brian P Posted June 6, 2008 Report Share Posted June 6, 2008 oh...OH!!! Yeah, that's probably right. Quote Link to comment Share on other sites More sharing options...
xtremerevolution Posted June 6, 2008 Author Report Share Posted June 6, 2008 Hmm, didn't hear much about the chipping pistons deal. Maybe I will leave it on. We'll see. I'd like to start replacing a lot of the rest in there with paint, so anything that can go without hurting me will probably end up going. I'll think about it a bit more. Quote Link to comment Share on other sites More sharing options...
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