The90 is for 900nm of torque which equals 663 ft-lbs. Only Audi's highest torque models (turbo diesels) have this transmission. The RS7 and S8 use the 8HP70 which is only rated for 700nm or 516-lbs of torque; it's no coincidence that the RS7 and S8's factory torque numbers are this exact number.
Theeight-speed tiptronic is a classic torque-converter automatic transmission whose great strength lies in its high level of shifting and drive off comfort.
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7 speed s tronic vs 8 speed tiptronic
