I have a 6nz in a Pete, 13spd, 3.55s and a solid steel piston IPD overhaul kit with about 75k on it and its got a 7cz 600 brakesaver file in it thats got some extra fuel and timing. Dont know what it dynos at, but no 600 hp rated truck, older or newer can pull with it. Naturally I've fought heat with it during summer time and I continuously get conflicting information on what I need for a turbo. Was running a 78/1.32 and it grenaded in a big way and was sold an 80/1.32 to "slow it down". Boost pressure dropped a little with the bigger wheel as did the pyrometer but my water temp builds faster and runs a little warmer overall. The 80 did clean up the smoke a little bit over the 78. This is in Colorado at over 5000 ft and loaded to 85-97k lbs. I always thought the turbine housing was what you wanted to change to properly slow a turbo and let the engine breathe. Seems to me like an 80 would just create even higher drive pressures. I've recently been reading that a 14.6 Liter would be much happier with a 1.45 exh housing so it can breathe and slow the turbo down as a whole, when I asked my tuner about it I was told the bigger housing takes more fuel to make the boost pressure so its less efficient. I always thought boost pressure was a restriction overall and that it is less important than actual airflow. Sooo, is the 1.32 stopping up a bunch of hot air that should just be skating by in a 1.45, or do I need it to keep the intake adequately supplied with charged air to feed the big file and let 'er scream?
Thanks
Turbo for a hot 6nz
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by matneyenterprises, Sep 6, 2021.
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I believe you are getting more air into the engine-particularly in higher gears and under heavy engine load demand- while at the same time getting less back pressure from the turbo. Hence, less smoke, and I bet better performance after the turbo is spooled up some. I would consider buying a high flow radiator. More tubes, more coolant, and maybe with dimpled tubes for better heat transfer.
matneyenterprises Thanks this. -
Oxbow and matneyenterprises Thank this.
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What are your egts? What are you getting for boost. Water temp? We need numbers .
spsauerland and Roberts450 Thank this. -
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I'm running a tune from kurt Murray and was running his turbo as well before switching to a compound setup. With his turbo I stopped watching egts because I couldn't make them get to high. Would run 40-43 lbs of boost. Modified BS file as well.
Wish I knew the specs on that turbomatneyenterprises and Magoo1968 Thank this. -
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matneyenterprises Thanks this.
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Just throwing it out there i don't know anything else but you said hot timing. Just a few degrees too far that could be your water temp issue. Did someone reputable do the tune?
w9l, Roger McG, Roberts450 and 1 other person Thank this.
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