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Nominal boost levels
I was asked to document the nominal boost levels for the UK ur-quattro engines,
so they're in this post for the archives together with the measuring techniques.
a) WR engine.
Drive vehicle in 2nd gear with throttle fully open and use brakes to
restrict rpm to 5500. Nominal boost at 15 degrees Celcius and sea level
is 0.68 bar. (Note: varies strongly with altitude.)
b) MB engine (1988 TORSEN).
Accelerate vehicle from 55 kph to 90 kph in third gear. Measure at 90 kph.
Nominal boost 0.53 to 0.59 bar.
c) RR engine (20V).
Accelerate in 4th gear from 60 kph until 3000 rpm. Nominal boost 0.81 to
Committee Member, UK Audi [ur-]quattro Owners Club