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  #11  
Old 02-12-2016, 08:23 AM
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Originally Posted by *******DieselTech View Post
6th gear, with as much loading as the truck will stand.

4th and 5th gear pulls will generate artificially low numbers on these trucks that do not accurately reflect track times.

The ECM needs a slower dynamic engine speed condition (additional load) for many of the control loops to accurately portray real world conditions. Mainly, the lack of aerodynamic load on the dyno. They are much more sensitive to this than the 6.0 or 6.4.
so what RPM is ideal to start the pull at?
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Old 01-12-2017, 08:12 AM
1800bigk 1800bigk is offline
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Headed to dyno my 6.7 soon too, what rpm can we run this engine up to? I have stock internals.
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Old 01-12-2017, 08:49 AM
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so what RPM is ideal to start the pull at?
Usually we start at 1800-2000 on a stockish turbo truck and put it in 5th manual to load it the hardest. that way you have some time down low to build boost.

6th Gear pulls will net the highest HP usually but like stated a 3.55 truck in 6th reving all the way to 3500 or more is very fast. We have seen a couple tires come apart on the dyno and it is not a good thing. totally trashes bed sides when it happens.

That being said we have never seen a good looking tire that came apart. They are usually some cheap or weathered tire that comes apart. We have had plenty of Toyo MTs passed 150... yikes
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Old 01-12-2017, 08:49 AM
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Headed to dyno my 6.7 soon too, what rpm can we run this engine up to? I have stock internals.
3500 is about all that you want to run it up to. 3700 would be ok
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Old 01-12-2017, 01:28 PM
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3500 is about all that you want to run it up to. 3700 would be ok
great thank you, I noticed my truck shifts around 3500 rpm but noticed the tach redlines at 4k so was curious.
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Old 01-12-2017, 02:23 PM
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They will rev to 4K on their own but it starts cutting fuel before that.
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