Quote:
Originally posted by Mr. Pockets
Do you really think that the IRIS has that profound an effect on the engine's performance? I mean, I'm not saying that it doesn't do anything. I'm just curious, now, how 'gutless' it would be without the IRIS working properly. 
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Hi Nick, yes mate, it is responsible for the two torque peaks that we have seen in the dyno graphs. If it was stuck open, the low speed Inertia pressure would be lost thorough the valve to the other side. Instead of building pressure in the cylinders on each side.
Stuck closed at higher rpm, the resonate inlet pipes could not induct a full cylinder of air, from one side, it needs both sides to be joined, to provide enough chamber volume to supply the air in the time available.
Harvey.
