1550 Degree Regen - TDR Roundtable

1550 Degree Regen

08-15-2007, 07:19 PM

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Join Date: Feb 2001 Location: Bozeman, MT Posts: 534

1550 Degree Regen

A few observations on a regen cycle:

1. It DOES happen during in town driving. This morning I drove for 5 miles of highway followed by 10 minutes of in town, ending with 25 miles of highway.
On the highway the regen started, it was running mostly 12-1400 degrees (thermocouple mounted pre turbo between #1 and #2 cylinders) Once I got to town it stayed between 1000 and 1200, normally it would be 5-700. Sitting at a stop light for just over a minute, it didn't drop below 1100 degrees.

I know it supposedly doesn't happen below 30 mph, but my findings totally contradict that. Either the 30mph part is wrong, or my truck is malfunctioning.

2. It gets HOT, really HOT. I drove for 5 miles straight with it never dropping below 1425, at one point I saw as high as 1550 degrees, but that only lasted for 20 seconds or so. So much for 1350 being the "safe" number

3. It will not cooldown to a safe temp before shutting it off. I let it sit and idle for 3-4 minutes when I got to work. It dropped from 1100 as I pulled off the highway to 700 once I parked. Would not drop below 700 after idling, I finally just shut it off.

2,100 miles on the truck if anyone is curious.

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