what exactly is regen on the new powerstrokes? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 11 (permalink) Old 02-03-2008, 11:35 PM Thread Starter
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what exactly is regen on the new powerstrokes?

I'm not new to diesels at all. I am a farm boy..... drove tractors all of my young 24 years of life. haha. I have really, but I'm new to diesels trucks. I am planning on either getting the 2008-2009 chevy or ford. I don't know which one yet. I just want to know what regen actually is. I'm pretty sure it has something to do with emissions, right? Whatever it is, could anyone fill me in with more detail about it? I plan on buying a diesel in the next year or so but no more than that. I DO NOT like the IFS in the chevys, but I've heard good things about their motors (reliable, performance). But I like the look of the fords exterior and interior, and like the solid axle up front. Before I end up spending 35-38 thousand dollars on a truck, I would like to know the most information about them first before choosing. Thanks fellas. Great forum website.
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post #2 of 11 (permalink) Old 02-04-2008, 12:32 AM
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TRD,

All 2007 emission compliant DIESELS for "on-road" use have "Diesel Particulate Filters" (DPFs for short). They also have a "Diesel Oxydation Catalyst" (DOC), but they have been around since the mid '90s in one form or another, and generally do not cause any trouble.

The DPF is basically a catalyzed filter. There is a coating on the core of the DPF (like a ceramic air filter - sort of) that helps burn the bigger chunks of soot into very fine ash particles, much like you "Webber Grill" takes a 50# bag of charcoal + some heat = cooked dinner + a small amount of ash. The DPF stores the soot until exhaust temps are high enough, then burns it to ash with the help of the "catalyzing agents", which are primarily Platinum and Palladium (rare and mega $$$ elemets).

What is "Regen". Regen is short for Regeneration, like a water softener would do. Basically, the engine controller can add more fuel, restrict inlet airflow, very the turbo output to CAUSE an increase in exhaust temperatures, which will in turn, burn the soot to ash.

There are THREE types of regeneration:

Passive: This occurs in any diesel fueled engine where EGTs are over apx. 600*F, basically while it is driven at highway speeds or under load. There is NOTHING "extra" happening, it is 100% natural.

Active: This is when the ECM does *something* to artificially increase EGTs so the soot can be burned to ash. This happens when the ECM sees the DPF becomming restricted with excess soot, and not enough EGT is present for passive regeneration. ACTIVE REGEN HURTS FUEL ECONOMY AND POWER. It is mostly due to light duty driving (grocery getting), and ideling.

Manual: This *may* be an option in some vehicles. The operator can initiate an "active" regeneration cycle while parked with the engine running. Again, this has negatives that go with it.

Why do some vehicles "regen" a lot more then others? There are three factors, you can truely only control 2 of them for now....

1) Oil. You MUST use "CJ-4" low ash oil in 2007 and newer diesel engine for highway use. Older CI-4 oils will poison the DPF.

2) Idle time. Extended idle time causes low combustion temperatures, excessive soot, and premature plugging of the DPF.

3) Fuel. All 2007 and newer highway diesel engine MUST USE ONLY "ULSD" - ULTRA Low Sulfur Diesel fuel. Unfortunately, MANY readily available fuels, despite having a sticker indicating "ULSD" are mixed with higher sulfur "LSD" fuels. This will DESTROY the DPF with extended use.

Sulfur in the oil and fuel will "poison" the DPF. Sorta like pouring water on your charcoal, then trying to get it to light. It'll never work.

Regeneration burns the soot to ash, therby reducing it's volume to approximately 1/1000th of that of the raw soot. Eventually, the DPF will need to be cleaned, but this is a 100,000 mile or later affair, with normal use.

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post #3 of 11 (permalink) Old 02-04-2008, 06:38 PM
 
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Awesome explanation...I learned something new. Thanks JohnG!
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post #4 of 11 (permalink) Old 02-05-2008, 11:40 AM
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As Always

Thank you as always John_G. I save all of your stuff and put it in a book for later reference:bow:
I have read back and forth about regen. Some say High seed driving causes it, but that never made any sense to me. Your explanation clarifies a lot of stuff going on in my pea brain.:bow:
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post #5 of 11 (permalink) Old 02-05-2008, 03:01 PM
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regen is retarded.. thats all there is to it... or just take john's reason

Jeff
1996 ram 2500 ex cab long 2wd, 5'' straight, 215s, 4k gsk(only revin till 3k), 16* timing, fuel plate MIA, afc modded FF, CFM intake mani, afe stage 2

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post #6 of 11 (permalink) Old 02-05-2008, 03:03 PM
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oh and one more thing to add to john's post..... If for what ever reason Regen doesn't happen in 800 miles... The truck will automaticly go into regen

Jeff
1996 ram 2500 ex cab long 2wd, 5'' straight, 215s, 4k gsk(only revin till 3k), 16* timing, fuel plate MIA, afc modded FF, CFM intake mani, afe stage 2

15.40 at 90.61 in the 1/4th (09-18-10)
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post #7 of 11 (permalink) Old 02-05-2008, 06:59 PM
 
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It's amazing to see how HOT the EGT's get during regen. Cruising @ 2,000 rpm at a consistant speed ~75mph on the highway my egts are normaly around 700-800* once regen kicks in EGT's jump to 1350-1400* and stay there for about 15min. and thats unloaded!
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post #8 of 11 (permalink) Old 02-05-2008, 11:21 PM
 
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Quote:
Originally Posted by Rainman
It's amazing to see how HOT the EGT's get during regen. Cruising @ 2,000 rpm at a consistant speed ~75mph on the highway my egts are normaly around 700-800* once regen kicks in EGT's jump to 1350-1400* and stay there for about 15min. and thats unloaded!
Wow...I had no idea that it got that hot. I wonder how hot things can get under heavy load?
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post #9 of 11 (permalink) Old 02-06-2008, 08:11 PM
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1500-1600 my guess is

Jeff
1996 ram 2500 ex cab long 2wd, 5'' straight, 215s, 4k gsk(only revin till 3k), 16* timing, fuel plate MIA, afc modded FF, CFM intake mani, afe stage 2

15.40 at 90.61 in the 1/4th (09-18-10)
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post #10 of 11 (permalink) Old 02-08-2008, 06:52 PM
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Quote:
Originally Posted by Rainman
It's amazing to see how HOT the EGT's get during regen. Cruising @ 2,000 rpm at a consistant speed ~75mph on the highway my egts are normaly around 700-800* once regen kicks in EGT's jump to 1350-1400* and stay there for about 15min. and thats unloaded!


Mine only goes to 900 to a 1000* in regen. according to my EGT prob.

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