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Been chasing an intermittent idle issue now for a while, and just got an ECUtalk lead and software for the laptop... Set it up in the car, found ignition timing was showing a solid 15deg at startup, but after about a minute or so running, timing started jumping around constantly between 0-10 deg on idle. Everything else was reading pretty steady apart from O2 voltage which i think is supposed to jump around between 0-1v and it was, so normal? Ignition timing held pretty steady when high in the revs apart from the occasional blip of a couple of degrees either way, but back to jumping all over the place between 0-10 as soon as the throttle is let off and back to idle. So is this pretty conclusive then, that the CAS is rooted? Or could it be just indicating something else to be checked, before I go spend a fair chunk of cash on a new CAS?

Hi guys, does anyone know the different angles of the throttle butterfly valve with respect to the rpm range of the engine? I also need to know the air flow rate with respect to the rpm of the engine. The engine must be a rb25det, preferably running with stock turbo, stock boost and stock intake manifold. I know most of the info can be obtained by consult software like Ecutalk, but I don't have access to a consult cable. I need the info for some CFD work. Any help would be much appreciated! Sam