Quote:
Originally Posted by Mike@N54Tuning.com
As I said the N54 platform is pretty unique which is why people who come from other backgrounds always have your strong opinions until they do the tuning themselves. Fueling is closed loop during WOT using wideband sensors. Boost is vacuum controlled with a default open position. Timing is closed loop. It uses what we refer to as "maximum set points" and continually adds timing, listens for early knock, and removes timing, until it hits its maximum set point. Which are set so high that it would take race gas to hit them on a stock car. It uses short term trims (knock) and long term trims (octane) analogous to long and short term fuel trims. This is in addition to all the other factors that influence the timing mapping. If you add race gas you will automatically increase advance in a factory stock or tuned car as they are all running on this knock threshold system. As you get close to not being able to support your boost with your octane the DME logic starts overreacting with 3 degree drops instead of small 1/4 degree drops and you know it's time to dial back the boost. This is the basis for piggyback autotuning.
Mike
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That is simply untrue, the only reason the ecu advances timing with race gas on a stock car is for 1 reason
The stock is timed to aggressive for the conditions its driven in.
You just wrote a huge paragraph and explained nothing. By simplying lowering the TARGET timing, you achieve knock free operation, just like any other modern platform.
I posted BONE STOCK timing vs load charts that cobb provided multiple times. ARe you simply ignoring them?