jevonlau |
08-10-2020 11:55 AM |
454 MPI rpm issue
I got a new to me 99 baja outlaw 25 and it came with a 454 mpi and a 21p prop. At WOT I only hit about 41mph and 4000 rpm, which seems low for this set up. I have friends with the same boat running a 23p prop running 4800 rpm in the 50's. I have changed the fuel filter as well as the ignition module (thinking it wasn't getting advanced timing) and not much change. I have the base timing set at 8 deg and thats about all you can adjust on it. I hooked up a fuel pressure gauge on the schrader valve on the top of the engine and it was about 48 at WOT. From what I'm reading, I should be closer to 4800-5000 rpm at wot. After planning, I trim up and see some gain in rpm but it maxes out around 4000. It seems like I'm getting fuel and timing, but not sure where else to check. Any help would be appreciated, thanks!
The previous owner said he had just gotten a tune up beginning of the season. New plugs, distributor cap, fluids, etc...
|