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Hi everyone, first time posting here with my new hobby. I’ve got a question about vgt adjustments on my 4th gen Cummins with compounds,cheetah on bottom and 475 on top
I’m trying to get the vgt to drop to 0 when I get into high load areas. I’ve commanded 0’s along a sizable area in the minimum vane position map where I’d like it to drop but i cannot get it to go down that far. It’ll get to the low 30’s but that’s it. Hopefully someone can shed some light on what I’m missing. I am using HP tuners.
The only way to force the vanes with that strategy is to lower the maximum. Lowering the minimum allows the vanes to go to zero if the rest of the airflow model agrees with that decision, but lowering the maximums forces them to that position regardless.
Hope this helps,
Nick
Thanks Nick. I’m assuming I could accomplish the same thing by changing the airflow models right? Or a combination of both. Would I want to command more airflow in those areas or set them to zero as well?
Happy to help. Theoretically you can accomplish the same by adjusting the airflow models, but unless you've calibrated the MAF sensor and scaled it out past 475g/s (which is roughly where the 13-18 model saturated in our testing) you may be limited by your inputs.
Good deal. Your input is much appreciated!
