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Regen...How long has it been?

5K views 24 replies 11 participants last post by  netboy 
#1 ·
Hey everyone, I have a '15 that I got in May of 2016 brand new. I am coming up just short of 29,000 miles on it, comprised of 85-90% highway miles. I cant recall the last time I had a regen, the first one was quick and the 2nd was quite some time ago. How long is everyone going on average between these? Or how long should it be between them? Thanks!
 
#2 ·
Typically regens occur around once every 70-100 miles during average driving patterns. Unless you have a GDE tune with the regen indicator option, you will not see regen notifications unless you get to a point where the DPF is nearing full and needs to warn you. You might want to read a previous post I made regarding this.
 
#3 ·
I have an export 2014, so maybe a bit different, but on mine the regen message doesn't appear on every regen. It will only appear if the filter is close to full and it hasn't been able to complete a regen because of short trips, or slow driving, etc.

You can buy an OBD scanner and watch for regens, mine happen every 700-800kms (or once a tank)
 
#5 ·
LOL mini-regen. A regen is a regen. There's only active and passive, which has no correlation to the EVIC message indicating a regen.

Bouvs10, you're having a regen every 70-150 miles with the stock tune. You won't see it on the dash unless these 65% regens are interrupted often enough to fill the dpf to 80%, at which time you'll get the EVIC message.

Get the GDE tune and the engine produces 700% less soot, regen every 700mi or so.
 
#8 ·
So GDE waits longer until Regen goes into affect vs stock tune? So When the GDE tune does regen does it regen for a longer time then stock?

I think it is cool what GDE is doing but to claim there tunes get better fuel mileage, still meets emissions and regen happens 7x less then stock is hard to believe. FCA set the tuning where it is in order to meet emissions, fuel economy, and make sure the powertrain stays reliable. They spend $billions per yer to make the most fuel mileage, meet emissions, and create a durable vehicle. Hard to believe a small after market tuning company has a better mouse trap and can still meet the same criteria as stock tuning has to do.
 
#14 ·
The only way to produce less soot in the DPF is to run more lean which creates more NOx. Then in order to clean up the NOx you have to use more Urea which GDE also claims to use less DEF then stock. So there is no way GDE is even close to meeting emissions.

By multiple injection events you create a cleaner fuel burn and quiet down the combustion event. Stock tuning does this.

I am going to get a GDE tune for my ED once this EPA recall gets squared away. Otherwise it will be a waste of money do the tune right now. I am glad GDE is doing there tunes but to call them a EPA certified tune (like OEM was...hehe) is false. GDE is considered clean as the DPF/DOC/SCR is left in tact. Several tuners do this on Duramax's and Powerstrokes, and Cummins. But most do not claim but maybe 1mpg as there are still regens that use fuel.
 
#18 ·
Regular regens, really? Doesn't it depend on how you drive? Mine is stock, no tune, and in 56K miles of driving I only got the EVIC regen notice once, when I was doing all city stop-and-start driving. Specifically, 40K on the 2014 and 16K on the 2016 and only 1 regen here.

Is there something wrong with mine?
 
#19 ·
No, regens occur without the message displaying, it pops up when the filter level gets too high (~80%) and it hasn't been able to regen due to stop start traffic, etc.
 
#22 ·
FYI, The GDE tune is sold 'for off-road use only' and does not need to meet any emission standard. The term' clean diesel' is a bit of a misnomer. The came about with diesel particulate filters and soot elimination from the tailpipe. NOx is already clean and invisible, it also breaks down to N and O in about 1.5 days in the atmosphere. CO2 hangs around for a long time and is considered the primary greenhouse gas...along with methane.
The NOx trade-off has a bit to do with running more lean (maybe 1% impact here), but mostly due to combustion temps in cylinder. Once you get past 2500 kelvin, NOX becomes a by-product of burning fuel. This accounts for 99% of the NOx in a diesel vehicle. Running lean (excess air, large lambda) helps reduce soot formation as the burn can be more complete.
 
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