Hey everyone. I've recently added a SCJ throttle body to my 2008 GT500 and have managed to make it drive pretty close to how it was on the stock TB. Snappy throttle like stock. Idles smooth and no on/off feeling. I've been using the Effective Area calculator but I cant seem to get the low throttle opening to act correctly. Say I'm in a parking lot or pulling out into traffic and I'm off the clutch at near idle and go to accelerate. The throttle will open then close then open back up again. It's been some work to get it in a log but I finally managed to do it. Log attached below. See 18:01:53/6:01:53 for the spot in question.
I've been going off of caniggia's thread and LaSota's book about adjusting the predicted table using torque error. If the torque error is positive, lower the value. If the value is negative, add to the value. Extra step I added is using the calculator to update the Effective Area table, as it *should* be the inverse, right? So far, this has worked rather well and my torque error, except at idle and low opening, isn't too bad. I have not touched my torque tables yet as I am not 100% sure on how to adjust those. Probably using torque error as well?
When the car goes to close the throttle, I see torque error skyrockets to 3000+ and ETC Vacuum also skyrockets. I don't know what I need to adjust!
Car has upper pulley, intake, full exhaust and now the TB. Idle torque error is around 250-500. I tried getting this lower but haven't been able to with the throttle tables. I ended up adding some airflow to the idle airflow tables and that stabilized the idle for the most part. Any suggestions are welcome. Trying to learn proper throttle tuning to apply at my shop! Thanks.
18-03-28 18-24-26.hpl
08GT500-9.hpt