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Chike,
I have that same fuel consumption vs cylinder pressure plot in my locker. :-) As far as I know, the 2.5 RS fpr is working fine. I haven't looked at the vacuum line though. I haven't touched the fuel pump in any way. I suppose its possible that the ram air is having some effect, but keep in mind that the ecu does not just blindly add fuel. It meters fuel based on the MAF sensor reading (among other readings), so if the ram air is somehow messing up airflow at high rpm, the MAF would see this, and the ecu would add less fuel accordingly.
I'm fairly convinced that the afr reading is representative of what the SVX ecu is programmed to do. The other EG33 afr readouts from dyno runs that I've seen (SVXRide, LAN) show the afr progressively richening as the rpms increase. And if I look at the afr readings from your dyno runs, I see the same basic trend too. The afr on your car does richen as the rpms increase, and at peak rpm, there is a slight lean out. My afr runs show the same thing, and so do LANs.
As deruvian said, a little more power may be possible with the 2.5RS fpr by leaning out the mixture a bit at higher rpm using an SAFC-II (or something like it).
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Mychailo
:: 2006 Silver Mitsubishi Evolution 9, E85, 34 psi peak, 425wtq/505whp DJ ::
1995 Laguna Blue SVX L AWD 5MT (sold)
Visit my locker
SVX Mods: ND iridium spark plugs, Impreza RS fpr, afr tuned to 13.2:1 using a custom MAF bypass, custom exhaust, WRX 5MT w/ STi RA 1st-4th gear & stock WRX 5th gear, Exedy 13 lb flywheel & Sport Clutch, STi Group N tranny & engine mounts, urethane spacers in rear subframe, rear diff mounts, and pitch stopper, SVX Sport Strut Springs (185f/150r), custom 19 mm rear swaybar, urethane swaybar mounts, Rota Torque 17x8", 225/45-17 Proxes 4 tires, Axxis Deluxe Plus organic brake pads.
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