Originally Posted By: chrisri
Originally Posted By: Jetronic
The exhaust temperature only gets really hot during a regen in the catalyst though. That's where the raw fuel burns to heat up the DPF.
But I can get up to the maximum allowed pre-turbo EGT just by driving at top speed for a few seconds, without a Regen taking place. I say the EGT got higher because the power output for the displacement got higher in modern cars.
How do you act when regen take place? Do you notice it while driving? If you notice it at stop, how you proceed? Leave it on idle while it finishes or what?
I've removed DPF from my Bravo Sport day after I bought it, but with Vectra I'm not in a mood.
I put the transmission in sports mode (dynamic dna setting in alfa speak) so the engine makes more RPM (around 2000 rpm at light throttle, and easily goes beyond 4000 when accellerating even modestly) I usually notice the fuel consumption shooting up, sometimes I hear a heavier exhaust note. Especially when you let off the throttle and the consumption doezn't drop to 0 in 1 second, it means there's a regen happening.
If possible, I'll go around the block if the regen is in progress while I arrive at my destination, but if not I'll either letthe car idle (at work, I work at a car dealership) or worst case I just shut it down, but that hasn't happened more than 3 times in as many years.
A regen from start to finish takes 10 minutes, and often has been busy for a minute or 3 before I notice. I'm not inclined to drop the dpf out, the system works very well. Last summer I drove 2000 miles between regens anyway.