mhuffman
15+ Year Contributor
- 292
- 4
- Nov 3, 2006
-
Bowie,
Maryland
I am surprised there is such limited posting in this NT section. The 4G63 NT has a hugely flowing head and a large throttle body from the factory; i figure it is just a set of cams/springs and some intake/exhaust work away from being a very strong setup.
Being a mass airflow controlled motor, freeing up the breathing should (up to a point) be fully accounted for without requiring a re-tune, correct? adding intake/header/exhaust/cams will mean more air comes in, but this increased flow should be fully measured and accounted for and the computer will automatically add the required fuel (up to the limits of the stock fuel system).
SO MY QUESTION BECOMES: What is the maximum power that the stock 1g NT fuel system can handle, taking into account factory MAS/FP/injectors/FPR/tune? This data should be able to be obtained by monitoring injector duty cycle on a stock 1g NT engine and then looking at the % headroom.
For example, if the max injector duty cycle on a stock 1g NT is 65% (random value chosen), you have 15% headroom to stay below 80%. This means you could add up to 15% horsepower (15% of 135 would be 20 HP) before you would need to upgrade your fuel system.
Being a mass airflow controlled motor, freeing up the breathing should (up to a point) be fully accounted for without requiring a re-tune, correct? adding intake/header/exhaust/cams will mean more air comes in, but this increased flow should be fully measured and accounted for and the computer will automatically add the required fuel (up to the limits of the stock fuel system).
SO MY QUESTION BECOMES: What is the maximum power that the stock 1g NT fuel system can handle, taking into account factory MAS/FP/injectors/FPR/tune? This data should be able to be obtained by monitoring injector duty cycle on a stock 1g NT engine and then looking at the % headroom.
For example, if the max injector duty cycle on a stock 1g NT is 65% (random value chosen), you have 15% headroom to stay below 80%. This means you could add up to 15% horsepower (15% of 135 would be 20 HP) before you would need to upgrade your fuel system.