qtb007
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Would adding vvti to the T24A allow it to meet the 2027 emission requirements for BOF applications? Adding vvti to existing engines isn’t anything new for Toyota. They did that to the UZ, JZ, and I believe the FZ engines.
The T24 has both intake and exhaust VVT. It just doesn't have the ultra wide angle VVT. It has the same style solenoid for VVT-iW like the 2GR-FKS, but it really depends if the valves and pistons have clearance at those extreme angles of holding the valves open. Which could be addressed, maybe, with a piston shape change. The VVT-iEW mechanism is pretty drastically different, so it would require substantial changes to the timing chain cover and who knows what else.
Based on the overall direction change of moving to shorter stroke engines, I expect that they considered what it would take to meet the 2027 emissions with the T24, and decided that, as a system, it would make more financial sense to build some flexibility into the upcoming 2.0T.
Toyota's engine manufacturing processes are very flexible already, so it isn't like they toss out all the equipment for the T24 lines. They are already building the A25, M20, and other engines on those same lines.