Torquay were unable to build on Tuesday's 3-1 friendly win over Plymouth as they lost by the same margin to QPR on Friday.
Rangers took the lead after only 10 minutes when Heidar Helguson headed in a Leon Clarke cross.
The Gulls improved after the break and were rewarded with an equaliser from central defender Chris Robertson.
But the Championship side quickly re-took control with further goals from Josh Parker and Hogan Ephraim.
The Gulls next pre-season friendly will see them take on local rivals Bristol City at Plainmoor next Wednesday, 21 July.
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