I just looked at my 7 recent runs - they all cross at 5250 (or close to it). I recall that the reason is related to the tourque to HP conversion equation. Can't answer your question otherwise though.
1999 Amazon Green SVT Contour (#554/2760)
Stock SVT Duratec V6 with:
Intake- K&N filter/75mm MAF meter
Exhaust- MSDS Y-pipe/Bassani catback
Durability-Ford "dual mode" damper, Mobil 1/K&N oil filter
179.2 FWHP at 6900 RPM
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