Rambocj7

I just swapped these motors into my 36' Sonic (older stepped hull from 1986).

I hit the rev limiter at 4800 rpm. According to some documentation I found on the blue water motors (full closed cooling) this is factory. Is this normal? I thought these motors can rev up to 5100? Can this be adjusted?

I pulled this from an owners' manual on the motor:

4400-4800 RPM
8.2L MPI
400 1
502 C.I.D.
(8.2 L)
4.47 in.
(113.5mm)
8.75:1
309 1
340 1 (3122)
(2332)
1 Power Rated in Accordance with NMMA (National Marine Manufacturers’ Association) rating procedures.
2 Power Rated in Accordance with BSO/SAV rating procedures. This rating procedure is used to certify that the engine complies with “Stage 1” Bodensee
and Swiss Regulations. Horsepower differences shown result from differences in test RPM and allowable test tolerances.
3 Measured using an accurate service tachometer.

offthefront

iTrader: (1)

if its a 502 MPI prob is 4950 .. a mag is 5150 ...it can be changed but you have to reflash the ecm .....not a DIY deal .....m

JasonSmith

www.mefituning.com can help you.

Rambocj7

Its a magnum 502 MPI blue water...Definitely hitting the limiter at under 4800 rpm. Motor originally came in cruiser with trannies, dunno if that has something to do with it? So is it worth adjusting, or just leave it alone?

JasonSmith

A wise man once told me "when in doubt, lean it out". I think that same theory applies here. Turn it up!

Boat1

PM sent.