I have a 2012 Club Car DS, with a D&D motor, Curtis 500 amp controller, 26" tires, 6"lift. I was able to get speeds of 30mph plus, as my batteries aged, the speed decreased as the mileage between charges also decreased. I just installed 6 new Crown CR190. I just installed a new high speed magnet, 8 pole, didn't make any differences. I can't get my speed or mileage back. Any ideas on what's going on? I don't know what else that I can do. I contacted Curtis to see if they have any idea, was thinking that these controllers burn out after a while? No reply from them yet.