Hi,
2016 Chevy silverado with a L86 engine in it. Engine had a some head work and a cam installed. I don't know the specs unfortunately.
I have the VVE tuned in closed loop to around 3-5%. Being on a chassis dyno, it helps to fill in the histogram with good data. I decided to tune the open loop region of it (zone 23 and 29) but I couldn't do anything good because the throttle was being pull back to around 50 %. I was kinda expecting it after all the posts in the gen V section. The maf curve isn't too far off so I decided to look into the issue more.
With my virtual torque tables left stock and my DD tables stock, I decided to have a go at it. I bumped up the virtual torque tables by 10 % and it only made the throttle closure worse. I also bumped up the driver demand tables up by the same amount, same thing, throttle was being pull back worse than stock settings. I also tried a various combination of bumping those tables up to try and model the torque as best as I could, but anything else more than stock was just worse.
Then, I went ahead and added 20% in the VVE table into zone 23 and 29. They way I understand it, is that the airflow model has to be as most precise as possible. Same thing, throttle was still being pulled back and even the fueling was not even changing. I bumped up the maf curve above 7350 Hz by the same 20% and same results. Engine goes lean above 5000rpm with the throttle at 50 %
Then I did something, I decided to bring the virtual torque tables DOWN from the stock numbers by almost 35%. Same driver demand tables, same peak torque table, same VVE table that was calibrated with around 3-5% of error and the throttle does not close anymore. Strait at 90% the whole run. I understand I should have less torque at idle and cruise region but at WOT it should see more torque...I am sure I am not getting something because it doesn't make sense.
Here are the logs and the tune files. The hpt tune "nomorethrottlepull" is the one with LESS virtual torque numbers.
VVEtuningOK_MAFSCALING.hptpower_run3gear.hplnomorethrottlepull.hptno_throttle_pull.hpl