wheelman Posted January 7, 2004 Share Posted January 7, 2004 This may seem like a duh question but I'm going to ask it anyway. I've searched the site for information regarding the removal of the smog stuff from the GEN II chevy engines (LT1, L99) and how it affects performance and come up with basically nothing. I haven't looked on any LT1 specific sites yet so forgive me if this is a no brainer. Here goes. In the past we always removed the smog stuff from engines because it was a drag on performance. In the last couple weeks I've seen a few posts here that make me wonder if this is true for the newer engines. One post in particular was basically an advertisement for the new John's Cars LS1 kit where it was stated that removing the EGR prevents the computer from being able to retard or advance the spark like it's supposed to. I don't remember exactly what the other post was but the opinion being expressed was that there's no benefit to removing the smog equipment from the new computer controlled engines and it makes them run dirtier, idle rougher, harder to start and have less HP. I have a 95 LT1 from a Caprice cop car that I'm putting in a 73 240Z so I'm exempt from smog inspections and besides WA state doesn't have state wide inspections, only certain areas. Anyway I plan on removing all the smog equipment (air pump, EGR, evap canister) and then re-programming the PCM. Before I do this though I want to be sure that it will improve performance. I have the complete donor car so I could salvage the evap canister but I really don't want to have to deal with it. So what's the true story here? Will removing the smog stuff and reprogramming the computer increase, decrease or not change the performance. Ken W. Quote Link to comment Share on other sites More sharing options...
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