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Trucker Forum - Trucking & Driving Forums - Class A Drivers (https://www.classadrivers.com/forum/)
-   Owner Operators Forums (https://www.classadrivers.com/forum/owner-operators-forums-105/)
-   -   Pre-EGR ISM vs. Cat C12 (https://www.classadrivers.com/forum/owner-operators-forums/38143-pre-egr-ism-vs-cat-c12.html)

tracer 07-18-2009 07:00 AM
Originally Posted by Copperhead (Post 456379)
I would have no problem getting an EGR version Cummins. Just disable the EGR like I did on my ISX and gain about 1 mpg better fuel mileage, less wear and tear on the engine (oil samples look better), and engine runs w...a...y cooler, even on a warm day with the AC on and under a good pull, it never gets above 190-195F and the fan hardly cycles anymore... only if sitting in traffic or idleing. Recently pulled about 43,000 lb payload over the WV turnpike and then on hwy 460 into VA and the fan never had to cycle once pulling those hills with the AC on.
You mean you disabled EGR in the ECM/computer settings? Maybe I need to do something like that on my CAT... I removed their proprietary muffler but didn't change anything in the ECM...

LightsChromeHorsepower 07-18-2009 11:17 AM
I don't think your CAT has an EGR. ACERT is supposed to be a catalyst in the muffler, variable valve timing & really high turbo boost as an alternative to an egr. CAT spent hundreds of millions on it before conceding it was/is a failure.

ForcedInduction 07-18-2009 10:27 PM
1 Attachment(s)
Originally Posted by LightsChromeHorsepower (Post 456469)
I don't think your CAT has an EGR. ACERT is supposed to be a catalyst in the muffler, variable valve timing & really high turbo boost as an alternative to an egr.
Many have an EGR, CAT just tries their damnedest not to call it that. It takes exhaust after the DPF and uses an intake flap to force "scrubbed" exhaust into the engine pre-turbos.

http://www.classadrivers.com/forum/a...c12-acert1.jpg

solo379 07-19-2009 06:59 AM
Originally Posted by tracer (Post 456450)

By the way, I threw out the ACERT muffler last summer and put a free flow one. Did emissions this year and was a bit worried. The funny thing is without ACERT my emissions were actually LOWER than last year when I had their muffler! Go figure.
Did your muffler has a catalytic converter in it? Cause i have 2 mufflers at $2500 each, and sure not gonna buy new one at that price. So you are saying your test came out good, on all parameters?

Hell, i might put a "Liberator" muffler, chipper than that....

LightsChromeHorsepower 07-19-2009 10:23 AM
Originally Posted by ForcedInduction (Post 456514)
Many have an EGR, CAT just tries their damnedest not to call it that. It takes exhaust after the DPF and uses an intake flap to force "scrubbed" exhaust into the engine pre-turbos.

http://www.classadrivers.com/forum/a...c12-acert1.jpg
Do you think they got enough plumbing on the side of that thing? Our mechanic claims CAT spent half a billion on ACERT and still couldn't get it to work.

tracer 07-19-2009 11:05 AM
Originally Posted by solo379 (Post 456566)
Did your muffler has a catalytic converter in it? Cause i have 2 mufflers at $2500 each, and sure not gonna buy new one at that price. So you are saying your test came out good, on all parameters?

Hell, i might put a "Liberator" muffler, chipper than that....
Yes, I had that expensive original muffler from CAT with a converter inside. I thought my emissions would go thru the roof ... I went to the local exhaust shop Texis Exhaust in Mississauga, Ontario, and they took off the CAT muffler with the converter and gave me a performance free-flow muffler. I love how the engine sounds now and emissions actually went down! The people who designed the converter must have been on drugs. I also think my fuel mileage has slightly improved, maybe by 1/10 of mpg.

So, throw out the CAT mufflers and put on something that doesn't restrict the air flow. Your engine will thank you :)

allan5oh 07-19-2009 11:06 AM
ACERT does work, I just think they were having a hell of a time trying to meet the 2010 EPA regs.

ForcedInduction 07-19-2009 08:58 PM
Originally Posted by allan5oh (Post 456595)
ACERT does work, I just think they were having a hell of a time trying to meet the 2010 EPA regs.
The EPA cut the NOx limit by 99%, everyone is having problems. 2010 emissions limits are already near zero, yet there are still the 2012 and 2016 emissions cuts to worry about....

Copperhead 07-20-2009 07:40 PM
Originally Posted by tracer (Post 456452)
You mean you disabled EGR in the ECM/computer settings? Maybe I need to do something like that on my CAT... I removed their proprietary muffler but didn't change anything in the ECM...
Nope... just 30 seconds of my time, no tools, no parts, no hooking up a computer. Just a simple unplug of the lower plug on the EGR.


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