Originally Posted by 92 s10 project
Its all about making stuff work like it should, when its not working like it should.
By just removing the EGR components, which I have done myself, the engine is no longer working like it should, or to its fullest potential. So by getting the PROM changed to ignore all the EGR stuff and taking care of fuel maps otherwise, it is now working like it should.
If you read everything that has been discussed in this thread, its pretty self explanatory why it should be done correctly.
I am glad that you have enough vision to "see" this issue.
Brian, of tbichips.com, is an advertiser on eBay. He claims a 12 HP boost from using one of his "tuned" prom chips. It is not much of a boost and certainly NOT worth his asking price. Knowing what I know now, about how well the OE prom chip is programmed, I believe that this 12 HP boost may come from EGR elimination.
By the 7% more fuel/air going into each cylinder that was inert (non-combustibles) exhaust gas, injected by the EGR valve, before. That is 7% of the swept volume of each cylinder. Will the Duke gobble more fuel without an EGR valve?? Of course it will. But by giving the Duke what it wants, you gain a power increase. Will the combustion/cylinder temperatures increase? Of course they will. But by using a 180* t-stat you negate that concern completely. No worries about blown head gaskets or burnt valves.
So, this EGR elimination is really a three step process: #1
The prom chip with the EGR valve functions removed (programmed out) #2 The physical removal of all EGR components on the engine #3 The use of a 180* t-stat...
I would even go so far as to say, that, because an air/fuel mixture does not compress as easily as the inert exhaust
gas does, you *may* even see a slight improvement in compression...