hmm currently running 70% meth to water and i have it turned on at 8.5psi to full spray and the afr is roughly 10.2-10.3. running the 3.1" pulley with 21-22* and tapers to 18* a tthe shifts(i did it that way). just getting a feel on what you guys are running with afr or if it really varies from car to car on what afr it can actually run with out knock/detonation.