My only point was trying to make the pilots job easier

We have been thinking and talking a lot about the drive guardian as well even 6 months ago. Also what Mark posted about pulling timing and the rev limiting. Just saying. So many things to think about and that has been hashed out. Funny Mark and I and including UD Dave have said if only we got paid for all this thinking and talking everyday about building a boat --- hell we would be rich and not have to work

[QUOTE=lavey jr;4501772]Only speaking of boat handling and not outdrive/equipment longevity... Some engine braking is good and useful. Boats don't have brakes so what do you do when you need to slow down? You pull back on the throttle. So let say for example the boat starts to get a little too loose... You want to cut back on the throttle and (hopefully) rely on water drag on the bottom and equipment in the water to slow the boat down in order to help settle the boat. If you do this in a boat with a #6 style cleaver propeller, especially twin engine, it will settle quite quickly due to the substantial drag increase. Now with single engine bravo style outdrive and bravo style propeller you have a lot less drag in that application. So, I personally feel that some engine braking is beneficial in order to provide a little more resistance on the wetted items that are in the water to help grab, slow down, and/or settle the boat. Of course you don't want a sh*t ton of engine braking but I think you get what I'm saying. As far as engine braking running in rough water, if you are experienced and know how to read the water and work the throttles on takeoff

I am going to through this out there a bravo type drive when you pull the throttle back the cone clutch will slip like a sprag so something for you guys to think about.

here you can see the little "chirps" when the prop gets unloaded for a millisecond every so often, and this isnt' really rough water. It be interesting to see how your map would work though. Do you think if you repeatedly pull timing back over and over every couple seconds per say, if the engine was runnning hard on a long run getting unloaded and loaded, say to 4* btdc, it would have any effect on the exhaust temperatures?
https://www.youtube.com/watch?v=D59j38v0em0

Does this ecu have slope rate for traction control it will start dropping cylinders so the motor can only rev so fast.
Not sure I spelt that rite^^

You are 100% rite with exhaust temp. Valves will not like it one bit.

Yes but we use timing instead of killing cylinders.......... it's much more effective and not as hard on the engine

You are thinking of pulling timing while it's loaded, it shouldn't give undue temps pulling timing while it's unloaded.

Noted.
As for this timing topic and rev limit. From my knowledge you'll be able to set all this based off of the load that's being placed on the engine. So the very moment the engine/computer detects a lower load it can pull anything you want weather it be timing and/or fuel to reduce the torque the engine is putting out and then as soon as it detects more/normal load it returns to normal. This seems similar to modern day cars when they switch back and forth to open/closed loop depending on throttle input and load in order to provide less power to improve the engines consumption/efficiency. So in a boat application if you leave the water the engine will free rev (less load) and then the computer will pull the parameters, as soon as you enter the water it will sense the load and return to normal.
Speculating on this lets say the the computer is slightly slow to put full power back, it wouldn't be substantially noticeable and possibly could even act as a helper to gradually lay back into full power rather than just nailing the equipment. In turn help decrease load spike on the equipment.
This is all speculation because I do not know much at all about the whole engine building and tuning...

Little story took my twin turbo SBC boat for a ride with no header braces on it was running it for the day came back in and the headers bent down like 3". Took my fork lift hooked a rope around the turbo put some load on the rope started engine revved engine about 4k and retarded the timing and jumped on trailer an fixed the headers. They glow red at about 15*.