My preference is the 5ek 3406. We have a couple 6nzs and I can't say I'm too impressed with them. (All are bone stock with no mods) the 5ek that I run is set at 550 HP 1850 and i can get 5.7 mpg with a western star 4900ex. On the 6nz equipped trucks I can't even hit 5 mpg. But we run right at 80k in the mountains all the time. And the 5ek just sounds better IMO.
6NZ vs 3406E
Discussion in 'Trucks [ Eighteen Wheelers ]' started by areelius, Sep 27, 2013.
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NWAF, steve092, tommygun58 and 3 others Thank this.
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My engine just was just completely overhauled by a cat dealer and put in a new glider. I have no idea what files they use, I'm guessing whatever epa dictates. Out other trucks haven't been touched and are as they were from factory. Its just my experience that I can seem to do better with a 5ek over the 6nz. I believe both to be great engines though. But you mention throttle response, and the response on a 5ek is rather doggish compared to the 6nz.
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Gettin the pre low nox file in these ecms is a must to even give these motors a chance to run good, i stay faaaar away from any cat dealer, at the local cat shop that truck rolls thru the door they plug right into the ecm to update. But my indy cant even plug into As i have my ecm port pad locked to prevent any unauthorized use
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The folks who complain about poor fuel mileage from CAT's have probably never driven one tuned right. Who knows if they have maintenance issues and bad driving habits also.?
steve092, t800kwopper and cat from the valley Thank this. -
RockinChair Thanks this.
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In Australia the last model year was 2007 and the prefix was now 9NZ. I have 1 in my Kenny.
tommygun58 Thanks this. -
How can I tell what turbo I have? Can not find a tag. Are there numbers stamped in it somewhere?
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My friend has a 1LW with a pre nox brakesaver 600horse tune and the 74MM turbo. It was just rebuilt again and has 2.7 million miles on the block. It's getting 7.55mpg running 65 - 70 pulling an RGN with mostly legal loads. What a fantastic set up!
I miss my CAT so much ... this ISX sucks!nwharry and t800kwopper Thank this.
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