No exhaust noise!!!!! - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 6 (permalink) Old 07-26-2007, 06:16 PM Thread Starter
 
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Lightbulb No exhaust noise!!!!!

I think there is a resonator about a foot and a half from the turbo on the 6.7 pickups. I have unbolted the first cat and drove a couple miles before i bolted it back up, and it still was not very loud at all. This resonator could have a lot to do with it. I dont see why a guy couldnt pull this off and put a new downpipe on. I would think that as smart as these computers are it would fix itslef to run with the different backpressure. Somebody chime in and tell me how dumb i sound:shrug:
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post #2 of 6 (permalink) Old 07-27-2007, 06:29 AM
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Not sure about the ECM on a diesel but I have had experience with other ECM's that needed to be reset to adjust to a new flow rate and settle in. Not sure how to reset the ECM on the diesel either. Procedure is likely different.

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post #3 of 6 (permalink) Old 07-27-2007, 02:36 PM
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Quote:
Originally Posted by dodeybob22
I think there is a resonator about a foot and a half from the turbo on the 6.7 pickups. I have unbolted the first cat and drove a couple miles before i bolted it back up, and it still was not very loud at all. This resonator could have a lot to do with it. I dont see why a guy couldnt pull this off and put a new downpipe on. I would think that as smart as these computers are it would fix itslef to run with the different backpressure. Somebody chime in and tell me how dumb i sound:shrug:
all those components are part of the emissions system, there is no resonator at the front. the first is an oxidation catalyst, then the diesel particulate filter ,and finally the catalytic converter (1st 2 for sure, not positive about the last). the problem with removing them is the fact that there are sensors before and after the DPF and the computer cannot work right w/o them (so far), and go into regen all the time (mileage will be in the toilet due to a ton of fuel being dumped to raise the EGT'sfor regen) or set the MIL.

Current: '07.5 2500 QC/SB ETJ/68RFE, 4x4, Fabtech 6" lift, KMC XD "Diesel" 20x10 wheels, Pro Comp X all terrain 37x13.5R20 tires, BDog P Pup AFE, MegacannonII, H&S Gen 1 DPF Delete, EGR unplugged. Dynoed 361hp/677tq 20090220
SOLD!'03.5 3500 SRW QC Dynoed 2/11/06 457hp/1002tq
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post #4 of 6 (permalink) Old 07-28-2007, 01:48 AM
 
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there are no cats, well not on my dads. just the dpf and muffler, never looked for the oxidation catalyst though
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post #5 of 6 (permalink) Old 07-28-2007, 03:14 AM Thread Starter
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Im starting to think that a lot of these trucks are different than eachother. I saw a picture of a chassis cab that only had one big dpf and cat put together. But the reason i ask is because i have a quad cab 6.7 and a foot or so away from the turbo the pipe is in the shape of square with rounded edges. its about a foot long and then it goes back to a circle.
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post #6 of 6 (permalink) Old 07-28-2007, 05:16 PM
 
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the 2500 and 3500 falls under different emissions laws for some stupid reason. They do have different setups.. I don't really know all the differences but i do know that the 2500s has o2 sensors and the 3500 doesn't.:shrug:
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