Have done it something is wrong My son's would GPS at 78 with a 30 inch at 46 with his wipplecharged 315 hp7.4. and it did make 500 hp, with Stainless Marine exhaust. his best top speed was 82 on a really good day. My guess the ECU is not dialed.
Randy owner of Donzis since 1966
High Performance props 3, 4, and 5 blade. Turbo and Stainless Steel props. Props for old Volvo drives.
The reason congressmen try so hard to get re-elected is that they would hate to have to make a living under the laws they've passed.