Twin Turbo Question?

I'm not 100% on this so I wouldnt take this as gospel and spread it as factual truth.

But I listen to how she runs and at times you can hear when the valve timing changes and when normally I should be able to hold 65 - 67 mph up a hill, instead it starts falling off and I have to split high gear. I'll set the CAT Messenger over and look at the exhaust gas and DPF temps. The DPF will hit upwards of 1000 - 1100f during a regen. Seems when ever I feel low on power, the DPF temps are always above 900f and doing a regen. So there is truth (In my opinion) that the ECM is cutting power during the regen cycle.

I had to have this truck towed in once because the DPF clogged and would not complete a regen. ACERT motors will go in limp mode and then shut off when the DPF fails to regen. Turned out the CAT filters were starving the injectors and ARD head for fuel. Replaced the filters with Fleetguard and issue went away. Later upgraded the fuel pump as a PM measure. CAT said there is nothing wrong with CAT filters,.. yet I now show better fuel pressure and it never drops when its doing a regen, where before it would.

The logic that goes into these emissions and clean air systems boggles my mind. Not that I blame CAT for anything of this. But tree huggers would rather see you burn 500 more gallons of fuel per run, so long as it comes out 'cleaner'. That just seems counter productive if you ask me. Lets burn more fuel sending more contaminants out in order to show that we burn cleaner during idle.

Its like the whole E85 thing. My Silverado loses 2 - 3 mpg burning E85 vs regular unleaded. How are we saving the environment by consuming more?

Hurst

 

I have one of these wonderful cat engines with a DPF on it. It also will most often give me 20-22 psi or so, other times it gives me 40 and runs very well. Sometimes it will be pulling a hill in high gear then just cut it right back. I think it has something to do with it opening the cgi valve and letting the exhaust "clean air" from DPF go back into the intake. I have found a place near home that is going to take care of my emissions problems once and for all.