Originally Posted by neil
What exactly measures the "flow" thru an EGR cooler? How does the engine know or not know if a specific flow rate is met at any RPM? And can that target flow be altered in respect to what the ECM wants to see? Obviously it can be ignored completely.
I understand the full EGR vs. full block...but I'm just thinking of a middle ground that actually keeps the EGR functional for the sake of being functional...but reducing its effects on the overall health of the engine.
If the States or Feds couldn't point to the EGR on a diesel pickup...a one-day class, an official illustrated government publication and a hand held diagnostic tool could easily take care of that for inspectors. I fully expect every State to be forced to comply with some MORE regulations in the short term. The way the liberal EPA fifth column is going its just a matter of a couple of more years. Its gonna get nasty for enthusiasts. I'd like to just say "ya..my EGR cooler is there and it is recirculating exhaust gases" while keeping its damage to a controllable level.
I suppose a sniffer test might throw my idea in the trash. But then again...does the Bulletproof cooler perform exactly as the OEM unit did in ALL respects as far as the EPA is concerned? And does the cooler keep the incoming temps of the exhaust gas down to the stock levels or better?
Yes to your questions. The BPD cooler is a MUCH better unit than the 05-07 stock coolers due to the design and better than the 03-04 units since it offers additional support to the tubes to prevent rubbing. BTW, the PCM reads the amount of backpressure being created by the EGR being blocked despite the valve being open. Too much backpressure and it triggers a CEL.
What is interesting is that the machines that are used here in AZ do not support the CAN protocol, which our PCM's use. Once the machines are upgraded to support CAN, you can bet that any of the custom tuned PCM's with EGR shutoff or blocked will be failed once the EGR is commanded open (like they do on the gasser engines).
PS. the inspectors spent about 10 minutes climbing all over my engine bay to ensure that my EGR cooler was intact and connected. In my opinion, they were looking for a reason to fail me. I will guarantee you that the inspectors here DO know what to look for. Thanks to my Gearhead "stock equivalent tune for my PowerMax" tune, I passed the snap test (romp the accelerator peddle to 4k RPM's and hold it for several seconds).