Rev limiter value

lonewolf41

Petty Officer 2nd Class
Joined
Jun 28, 2013
Messages
174
I'm trying to re-prop the boat and making runs with different props to check performance, verify WOT, etc. I have the diacom cable and software hooked up so I can monitor the engine (5.0 GXi-E)....specifically the engine speed. I went down in prop size and the motor didn't rev any faster so i assume I am on the rev limiter. I see fields like Governed RPM control, Governor controls MPH, and a few others in the software that seem related to a rev limiter, but none of them ever change from idle to when I hit max RPM. Is there a parameter that gets set or turns on when the rev limiter engages/activates? It would be nice to verify the rev limiter is kicked in rather than I'm just out of power with this combo. The max RPM logged is 5120, but I am only around 4850, so just want to be sure I am tuning everything for best performance and figured the best way was to run out of power right at or before the rev limiter kicks in.
 

Scott Danforth

Grumpy Vintage Moderator still playing with boats
Staff member
Joined
Jul 23, 2011
Messages
51,503
pretty sure the rev limiter in the software is near 5100 RPM. IIRC its a soft limiter on the EFI motors that simply starts cutting spark and fuel by a few cylinders at a time.
 

Jeff J

Petty Officer 1st Class
Joined
Jun 23, 2021
Messages
283
I over-revved a Volvo trying different props once. It went into a protect mode and I had to shut it off and restart before it would come out of it. I don’t recall the model. 6 cylinder EFI.

The original prop made the boat really doggy. I don’t know how anyone managed to ski behind it. New prop gave it a hole shot and some life while on step.
 

ESGWheel

Master Chief Petty Officer
Joined
Aug 29, 2015
Messages
855
I also have a 5.0 GXi-E along with all the manuals. I found a reference to the Rev limiter but not a value. The stated max RPM that it should be operated is 5K and I know I have gotten to slightly above that without it cutting out. This is based on the dash gauge which I have never checked for accuracy. As a point of reference, and I get each situation is different, but I get 45 MPH in my 23’ Larson bow rider with 2 on board, lots of gear and full tank using an aluminum 4 blade 14D 19P prop. Hole shot is great and back when the kids used to join us, no problem with a full boat and pulling the toys or water skiers.
 
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