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Old 06-14-2017, 09:26 PM   #1
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Rock Tamers and Newer Chevy Diesel Exhaust

I have Rock Tamers that I used on my old truck. I have a new Chevy Diesel now and was wondering if the exhaust, especially during regeneration, would melt the rubber. Does anyone out there have any experience with this? The new design exhaust pipe sits about 1 foot from the RH flap.
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Old 06-19-2017, 07:51 AM   #2
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I have Rock Tamers that I used on my old truck. I have a new Chevy Diesel now and was wondering if the exhaust, especially during regeneration, would melt the rubber. Does anyone out there have any experience with this? The new design exhaust pipe sits about 1 foot from the RH flap.
The new exhausts do not run any hotter than the old ones. During highway or heavy tow driving you won't even see a regen happen because the sustained higher RPM's will keep it clear. If doing a lot of city driving or prolonged periods at idle, that's when you'll see a regen. The regen is just the engine holding a higher rpm for a little while.

So bottom line, if your old diesel didn't melt the rubber, the new one shouldn't either.
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Old 06-19-2017, 10:03 AM   #3
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Don't count on not damaging with diesel or gas, depending how the end port is pointed. I have much experience with this. And...during regen it WILL scorch the rubber flap. I modified mine like this. Works well. My new truck points more out the side so it wouldn't be an issue, but the Dmax and 6.0 gas (old body style) point directly at the flap.
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Old 06-19-2017, 10:12 AM   #4
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The new exhausts do not run any hotter than the old ones. During highway or heavy tow driving you won't even see a regen happen because the sustained higher RPM's will keep it clear. If doing a lot of city driving or prolonged periods at idle, that's when you'll see a regen. The regen is just the engine holding a higher rpm for a little while.

So bottom line, if your old diesel didn't melt the rubber, the new one shouldn't either.
1) diesels produce soot at all spped and RPMs. It is captured by the particulate filter. Regen can occur at any speed above 35mph. DOES not regen at idle, or it is suspended below 35. This is so as not to burn someone walking past the exhaust tip or start a grass fire.

2) Regen is more than idle up. There is a fuel injector just upstream of the particulate filter. When excessive backpressure is sensed in the filter (full of soot), idle speed is increased, main injection timing changes, and fuel is injected into the filter where it burns due to higher exhaust temp as a result of timing change. The fuel burns in the filter incinerating the soot into ash. Exhaust tip temps rise DRAMATICALLY.

Ash must be removed from the filter approx. every 100K (solo driving...as amount of ash is dependent upon fuel burn quantity, not miles)

All this is for Dmax....others similar.
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Old 06-19-2017, 12:38 PM   #5
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rock tamers

Just curious if rock tamers lower your mpg's at all ???
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Old 06-19-2017, 12:46 PM   #6
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Just curious if rock tamers lower your mpg's at all ???
I noticed no difference, before and after, but I sure noticed a lot less stone chips and dents in the AS front!
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Old 06-19-2017, 03:14 PM   #7
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I have been researching this for days now. There are turn down exhaust tips available but most are 14" long. I don't know why GM did not use the the same angle for the exhaust on the new ones. The best thing I have come up with is to have an experienced welder take a small wedge out of the pipe forward of the diffuser and change the angel slightly to make it point more towards the side. I have been told that exhaust temperature can reach 1400 degrees during regeneration so the purpose of the diffuser is to cool the exhaust.
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Old 06-19-2017, 03:34 PM   #8
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I have been researching this for days now. There are turn down exhaust tips available but most are 14" long. I don't know why GM did not use the the same angle for the exhaust on the new ones. The best thing I have come up with is to have an experienced welder take a small wedge out of the pipe forward of the diffuser and change the angel slightly to make it point more towards the side. I have been told that exhaust temperature can reach 1400 degrees during regeneration so the purpose of the diffuser is to cool the exhaust.
Th angle is all about airflow through the diffuser. Change the angle and you may not get enough airflow. Check at gmupfitter.com and see if they have any limits stated. I know there are some mods in that guide for school bus applications to accommodate body builders and regs. Not sure if Silverado has an allowance.
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Old 06-19-2017, 06:46 PM   #9
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I met a RockTamer salesman. He wouldn't sell me a set 'cuz the exhaust from my Chevy diesel would melt them. I'm looking at mud flaps.
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Old 06-19-2017, 06:49 PM   #10
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You really need both for complete protection. See my mod above. I drove many miles with dmax an it works.
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Old 06-19-2017, 10:37 PM   #11
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i cut a hole in the flap with a saber saw. So far, no new rock dings.
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Old 06-20-2017, 08:04 AM   #12
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Been there, done that

Last year we took a trip to AZ in our Chevy 2500HD (gas) and noticed a circular crack in the passenger side Rock Tamer. Took another trip back east with crack duct taped and before long the hole totally blew out. Went through Monument, CO, where they are made this winter. Owner couldn't have been nicer. He said it was due to our tail pipe exhaust and gave us a whole new set of flaps and hardware. Long story short, we paid $140 to have our tailpipe modified to the side as he suggested. No problems since👍
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Old 06-20-2017, 12:58 PM   #13
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Thanks to all of you for great information. I talked with my local Chevy dealer as well as 3 different Diesel shops. I ended up making a 1/2 inch wedge shaped cut right at the first weld behind the diffuser which is about 20 inches from the tip and then re-welding it. I did not cut all of the way through so that it was easy to bend it and then shave off a little each time until it ended up where I wanted it. Believe it or not that moved the tip almost 10 inches to exactly the spot that the pipe on the older models was.
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