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  1. J

    Changing Gear Ratios on Bravo 3

    I definitely have a 2.0 Bravo. 32/27 upper that I am keeping. That mated with a 13/24 lower(purchasing a new lower with this ratio) has a final drive ratio of what? I’m getting 2.19
  2. J

    Changing Gear Ratios on Bravo 3

    Thanks. I need to get my RPM’s up and I really would like to change gear ratios as I do not believe this 2.0 drive ratio is cutting it. If I’m changing the lower already I’d like to know if my math is working out. The compression test was good, and fuel burn looked good.
  3. J

    Changing Gear Ratios on Bravo 3

    Hey everyone. This forum never lets me down so here we go. I have a 1970 SeaRay SRV 240. Repowered last year with a 383 MPI and Bravo 3 drive from a donor boat. The RPMs were never up to par. 4300 with 22P props, 4500 with 20P props. Well I had a crack in my gear lube monitor tube and my heat...
  4. J

    Need RPM’s on 383MPI 1970 SeaRay 24’ project

    Okay. Would error codes show on my Vesselview? There are none.
  5. J

    Need RPM’s on 383MPI 1970 SeaRay 24’ project

    Well I have free access to a scanner so I will do a run before my season is unfortunately over (Michigan)! Criteria to scan and watch would be spark advance and ???. How far should the computer advance the timing?
  6. J

    Need RPM’s on 383MPI 1970 SeaRay 24’ project

    Okay. Would it be best to get someone on the boat with testing equipment or just send the ECM to Whipple to get flashed?
  7. J

    Need RPM’s on 383MPI 1970 SeaRay 24’ project

    Got it. Yes idled for maybe 3-4minutes after full throttle. How does the 555 know the AFR?
  8. J

    Need RPM’s on 383MPI 1970 SeaRay 24’ project

    Here’s two plugs from each side. A little reddish. According to the charts I’m on the lean side but not dangerous. Does anyone think differently? Thanks!
  9. J

    Need RPM’s on 383MPI 1970 SeaRay 24’ project

    I will call the dyno sometime and see what they say. When I ordered it I thought it was to test its capabilities but when picked up it was presented as a break-in dyno.
  10. J

    Need RPM’s on 383MPI 1970 SeaRay 24’ project

    Right on. They’re good ole boats!
  11. J

    Need RPM’s on 383MPI 1970 SeaRay 24’ project

    Is there such a thing as a break-in dyno?
  12. J

    Need RPM’s on 383MPI 1970 SeaRay 24’ project

    Yes plenty of rot. The transom and engine stringers were removed and replaced. Transom built to merc spec.
  13. J

    Need RPM’s on 383MPI 1970 SeaRay 24’ project

    I don’t have it in the report but I was told it made 360hp (advertised as such too) maybe the dyno company can give me a better report. Thank on the compliment, we really enjoy the boat and the new reliability aspect. Just working out the things like this. Believe it or not the injectors are...
  14. J

    Need RPM’s on 383MPI 1970 SeaRay 24’ project

    Looking at the graph it doesn’t really show much…this was more of a break-in run from what I’m reading
  15. J

    Need RPM’s on 383MPI 1970 SeaRay 24’ project

    Thanks again for the suggestions! I have the ECM555 for sure. I wasn’t aware you can convert to MEFI. Attached the Dyno graph here… I have that same document for when I installed the distributor and I’m confident it’s installed correctly. Additionally I can get a scanner plugged in for a test...
  16. J

    Need RPM’s on 383MPI 1970 SeaRay 24’ project

    It has a flat cap and yes the block was clearanced for stroker crank and rotating assembly. I know and trust it was built as a stroker.
  17. J

    Need RPM’s on 383MPI 1970 SeaRay 24’ project

    Sorry I need to elaborate…I had a donor 350mag mpi and purchased a 383 long block. I used all my own accessories, he dynoed with his own intake and a 2 bar. Carb application. Idk why he dynoed with a 2 barrel. However, the computer was my own. I’ll try to find the report. It has one knock sensor...
  18. J

    Need RPM’s on 383MPI 1970 SeaRay 24’ project

    Thanks for reply guys. Alldodge - engine is rebuilt from local reputable rebuilder known for MPI and Vortec builds. He recommended I get the computer tuned since it’s from the stock 350mag mpi Scott Danforth - I do not know actual weight but when I pull it out of the well in a couple weeks I...
  19. J

    Need RPM’s on 383MPI 1970 SeaRay 24’ project

    So I got ambitious last winter and converted my 1970 SRV 240 hard top from omc stringer drive to a new 383 MPI and used Bravo 3 drive. I’ve now tried two separate sets of props and still have max rpm at 4400. Engine has a mild cam and upgraded valve train. Otherwise a basic built 383 Vortec. The...
  20. J

    2005 350 Mag dropping fuel pressure under load

    Second update - no more fuel problems after several trips out. But my ignition kept getting killed again. Checked my wiring again and I started to check move the wiring around towards the coil pack and when I moved the spark plug wires around engine stalled and beeped like you just turned the...
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