It'd be quicker at lower speeds once the turbo spools but at higher speeds there wouldn't be much in it.
The humble 160 VVC is quicker in the ZR than the KV6 in the ZS off the line (but the 143VVC in the F is quicker still).
The 1.9T was introduced in the ZT as it beat the 2.0L car tax bracket, same as people like Audi did with the A4 and A6. I suspect they would have sold more ZS 1.9T as company cars than they did 2.5 KV6.
The 2.0L KV6 Rover 45 was introduced to fight the Jag 2.0 V6 - a target too far maybe.
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Former custodian of the legend that was FE54 - RIP
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