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Pinging under a load

Engine

Vehicle Information: Model: 911; Year: 1987; Body Type: Targa; Engine (type, size, modifications): 3.2; Total Mileage: 129,000;

My car is mostly stock. A K&N Cone filter has been the only mod for 3 years. The car is is good running condition, to be expected of it's miles and condition. I added an aftermarket chip and on my first drive the engine knocks and pings only when about 50% or greater throttle and under a load, not at idle. Almost sounds like vavle noise. I use 91-93 Oct. fuel all the time. I can't think of anything that the DME computer controls like (variable timing) that would cause this type of noise. Any ideas?

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