bozza_boatie
Seaman
- Joined
- Apr 13, 2003
- Messages
- 65
I have a 1998 Cheetah 23" tunnel with a 350 Mag and Bravo 1. It has factory fuel injection and 4" through transom exaust. I have been getting a large amount of black residue on the back of the boat. We boat at lake Havasu and there are areas of extended no wake zones. I have been using 92 octane fuel but was told by someone that this engine should use 87 to 89 octane. I was also told that by running the higher octane fuel my computer can't adjust the timming correctly thus the black residue. Any other ideas?
