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ur-q detonation

Here is yet another question for the list.

My 83 ur-q is detonating under boost at about 7 psi.  The wastegate and
computer are stock.  The boost will go as high as 8.5 psi.  I am running
nothing but supreme fuel (92).  This has been going on for about 6 months.
I am getting tired of letting off the gas to save the engine.

Once again your help is appriciated

Jeff Hemmerlin

83 ur-q
95 S6