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i expected this to be much quicker than suburban.
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It is, but only after about 10 miles of getting up to operating temp.
Your engine includes a computer program subroutine called the "cold ambient pkg" (CAP), that's designed to idiot-proof your engine - from folks that want to romp on the engine and transmission when it's still cold. Count on having to baby the engine for a few miles when the temps are below freezing, then be nice to it for a few more miles until the engine coolant temp gets up to normal operating temp.
That subroutine in the powertrain control module (PCM) closes the exhaust back pressure valve (EBPV) when the oil temp is below about 150º and the intake air temp is less than about 50º. So power is restricted until that EBPV opens up. Also, the CAP won't allow the tranny to shift into overdrive, and it won't allow the torque converter to lock until the tranny warms up some.
But after a few miles of warming up, mine will run off an leave any diesel-engine Suburban.
