deja Posted May 8, 2006 Share Posted May 8, 2006 I've starting the rebuild on a '95 Z28 LT1 to go into my '77 280Z. This computer driven fuel injected engine is all new to me. On the back of the intake manifold there are two connection for the EGR. One is a tube which I assume runs to the exhaust manifold and the other is the mounting for the EGR. I did some searching here and see some have eliminated the EGR and some haven't. I also see block-offs advertised for the EGR. Is the EGR really necessary? Is there a real downside to not running the EGR in my Z? Quote Link to comment Share on other sites More sharing options...
jbc3 Posted May 9, 2006 Share Posted May 9, 2006 I blocked mine off years ago... never a problem. Jody Quote Link to comment Share on other sites More sharing options...
deja Posted May 9, 2006 Author Share Posted May 9, 2006 Thanks for the reply. Quote Link to comment Share on other sites More sharing options...
wheelman Posted May 9, 2006 Share Posted May 9, 2006 I blocked mine as well and removed the parameters from the programming in the PCM so no codes would be generated. No problems yet but I haven't driven it much either. Wheelman Quote Link to comment Share on other sites More sharing options...
Guest Wattz Posted May 9, 2006 Share Posted May 9, 2006 man i tryin to c what year Motor i have! i kno its a 350 rock but i dnt kno what year! Quote Link to comment Share on other sites More sharing options...
deja Posted May 9, 2006 Author Share Posted May 9, 2006 man i tryin to c what year Motor i have! i kno its a 350 rock but i dnt kno what year! Get the casting numbers off your block. Go to http://www.mortec.com/castnum.htm and look up the number Quote Link to comment Share on other sites More sharing options...
80LS1T Posted May 9, 2006 Share Posted May 9, 2006 man i tryin to c what year Motor i have! i kno its a 350 rock but i dnt kno what year! Leave the horrible spelling at the door and start your own thread. This has nothing to do with the LT1's EGR system. As for the question asked, I have mine blocked off too and edited out of the PCM. I haven't had any issues either. The guys who are running and EGR are pretty much only running it because they have to because they are in a SMOG state/area. Most guys dont run it because it clutters up the engine bay and isnt need to have the engine run right or better, just cleaner. Guy Quote Link to comment Share on other sites More sharing options...
deja Posted May 9, 2006 Author Share Posted May 9, 2006 As for the question asked' date=' I have mine blocked off too and edited out of the PCM. I haven't had any issues either. The guys who are running and EGR are pretty much only running it because they have to because they are in a SMOG state/area. Most guys dont run it because it clutters up the engine bay and isnt need to have the engine run right or better, just cleaner. Guy[/quote'] Thanks, that is what I figured. No problems with smog laws are a car this old in Georgia. So its coming off and added to my PCM delete list. Quote Link to comment Share on other sites More sharing options...
Bartman Posted May 9, 2006 Share Posted May 9, 2006 I found another forum that specifically discusses the pro's and con's of Exhaust Gas Recirculation http://www.domestictunerz.com/index.php?showtopic=13173 I've copied the specific information in case the link doesn't work: Exhaust Gas Recirculator(EGR): The EGR valves primary purpose is NOT to reuse unburned fuel as is commonly thought. The EGR's purpose is to cool the combustion event, thereby reducing NOX emissions. It does this by introducing exhaust particles into the intake stream, allowing advanced timing by adding broken down and expended fuel atoms which will not burn again. This reduction in the ammount of a useable air/fuel charge reduces combustion temperatures. This results in higher fuel mileage, especially during extended periods at cruise speeds. Other benefits are more advanced timing resulting in more power. There is a tradeoff here which i'll get into in a minute. The downsides to the EGR are it will, over time, gunk up the intake tract of the engine severely, especially if the valve sticks open, allowing extreme ammounts of exhaust gas into the intake. The benefits of blocking off the EGR are a cleaner intake charge, and more power as the computer will generally speaking, still advance timing as if the EGR is enabled, however this can lead to detonation, increased NOX emissions, and in severe cases, can literally melt the exhaust valves. In most cases, blocking off/removing the EGR will have no ill effects that are measurable, nor will it cause long term damage to the engine. Newer engines are no longer coming with EGR valves as better methods of fuel and ignition system control are becoming available, and the days of detrimentally fluctuating fuel mixtures are pretty much over. BTW - My EGR has been removed and programmed out of my PCM. Quote Link to comment Share on other sites More sharing options...
deja Posted May 9, 2006 Author Share Posted May 9, 2006 I saw that one the other day. That's one of the reasons I asked for opinios here. There never is a simple answer is there? Quote Link to comment Share on other sites More sharing options...
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