The Bentley states 0.83mm as the correct stock setting for this pump. This setting seems awfully low compared to my 84 rabbit and other discussions I have read here and elsewhere. I've tried setting the IP to 0.83 with unsatisfactory results (ie. doesn't run). What do you set your 81 IPs at? I'm considering trying 0.95 or 1.00, but wanted a little input first. Thanks for the help.