oldnavy wrote:
retmil46 wrote:
I'm going to keep the stock air filter for the time being, again to see how much difference just the muffler makes.
The folks at the VW diesel forum pretty much proved a couple years ago you don't want to put anything like a K&N filter on a turbo diesel or turbo gas engine as the 1/6 to 1/10 hp gain was useless. The other thing they discovered by accident was when oil testing was done, the increase in silica (dirt) in the engine was enourmance and something like 300% to 500% increase.
Here is a link to
filter testing done on a GM Duramax diesel you might want to read.
Keep us posted about the EGT gage install, and pictures if possiable. I could never figure out why they are not at least an option on a diesel car or truck, just doesn't make sense.
K&N wasn't even a consideration in my book, for exactly the reasons you mentioned, no measureable gains and poor filtration. Even if it did make a noticeable performance/mileage difference, the possibility of dusting and ruining my engine led me to rule out K&N filters on ANY of my vehicles a long time ago.
I also subscribe to the Turbo Diesel Register for dodge Cummins trucks. In the catalog that come with their monthly printed magazine, they list only one reuseable filter that gives high air flow and still meets the manufacturer specs for filtration, confirmed by oil analysis as above. AFE ProGuard 7. It's the only filter they list besides the stock Fleetguard paper filter, because, as they say, it's the only one besides the stock filter that actually filters! They just released one that will fit the CRD, p/n 73-10072.
I MAY give one a try to see if it works as advertised, but that's after the gauges and muffler.