Originally Posted by
metroplex
Bugasu: I use that Desired TIP Max Pressure to limit TIP pressure on my SHO, so the Desired TIP pretty much never goes above this value. Manifold pressure is just slightly lower than TIP pressure.
It's true the 2.0L/2.3L GTDI would run much higher airload numbers than the 3.5L EcoBoost. I know my 2.0L LNF GTDI in the Cobalt routinely sees over 220% airload.
When I ran 0.79 to 0.8 lambda, I'd run into insufficient fuel flow errors on the SHO - the fuel pressure would drop a bit as well. I eventually kept it at 0.85 and the fuel pressure remained steady. I didn't notice any extra knock protection with 0.79 or 0.82 lambda vs 0.85
On the LNF, many big name tuners would use 0.85-0.87 for max power. The factory setting went as high as 0.95 for the lower RPMs at WOT. I understand it is a different engine, but is a GTDI 2.0L inline 4 with a Bosch fueling system and a mechanical HPFP.