Raptor Extended Crank

[rdlangston13]

So on our 2017 Mojo if we are running on battery one, then shut the boat off, swap to battery two, and turn it back on it it will crank for like 10 seconds before firing. Not a slow crank or anything, normal cranking speed. The same is true when we go the other direction from battery two to battery one. I have a friend with a Malibu 25 wakesetter with the raptor 450 and his boat does the same thing. Has anyone else noticed this or are our boats jacked up? Should I look at getting something fixed?

[RC_Hinojosa]

I never had that occur when switching between batteries but my batteries are identical. You've introduced a variable since one of your banks is golf cart batteries right? Is the trickle charger plugged in while boat is in storage?

[rdlangston13]

I never had that occur when switching between batteries but my batteries are identical. You've introduced a variable since one of your banks is golf cart batteries right? Is the trickle charger plugged in while boat is in storage?

It was last year but I don't think I am going to leave it plugged in all the time. Its not a slow crank like the batteries have low voltage. It cranks at a normal speed but just doesnt fire up for a few seconds. The different types of batteries would have my attention more if my buddys wakesetter didn't do the same thing with two banks of the same batteries.

[RC_Hinojosa]

Maybe you could talk to Rinker's and see if they can remotely diagnose before making you drag it in...

[zabooda]

Don't use golf cart batteries for starting unless the primary battery is dead. They like a slow discharge and a slow charge so charging from the alternator can be questionable if the batteries have discharged enough. After running golf cart batteries for over twenty years I learned all about the costs of discharging them too much.

[rdlangston13]

Don't use golf cart batteries for starting unless the primary battery is dead. They like a slow discharge and a slow charge so charging from the alternator can be questionable if the batteries have discharged enough. After running golf cart batteries for over twenty years I learned all about the costs of discharging them too much.

So only use the golfcarts for party coving. Got it. I've been using them for everything and keeping the starting battery as a reserve in the event I drain them too much.

[MLA]

So only use the golfcarts for party coving. Got it. I've been using them for everything and keeping the starting battery as a reserve in the event I drain them too much.

For a backup start, i have no issue with using the GC bank, but for regular use, DI start/run on the cranking battery, then move switch to the GC bank for anchoring. When ready to run again, start on cranking but move over to BOTH to put some juice back in the GC bank.

Or, swap the 1/2/BOTH switch for the OFF/ON/COMBINE DCP switch and ACR and then dedicate the golf carts for the house and cranking for engine.

[parrothd]

Your clearing the computer/ecu when switching, probably takes a few cranks for the computer to get signal from all the sensors and fuel pump.

[MLA]

^^^ this would no different then turning the main switch to OFF for storage, then back on to 1 or 2 next trip out, At that point, he'd experience the same extended crank and it would seem normal.

[MLA]

^^^ this would no different then turning the main switch to OFF for storage, then back on to 1 or 2 next trip out, At that point, he'd experience the same extended crank and it would seem normal.

[parrothd]

Probably throws you into default tune mode and kills your fuel economy too. :)

[rdlangston13]

^^^ this would no different then turning the main switch to OFF for storage, then back on to 1 or 2 next trip out, At that point, he'd experience the same extended crank and it would seem normal.

Exactly. It fires up quickly if I go from bank 1 to off back to bank 1 or bank 2 to off then back to bank 2. Its only going from bank 1 to bank 2 or bank 2 to bank 1 does it experience the extended crank.

[russellsmojo]

Maybe a skiers choice rep can jump in because my Moomba’s have done this but Supra’s never have. So my thought is around the fuel supply/pump something different in the two brands.


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[Broke Pilot]

What do 2 golf cart batteries run fully charged at rest? 12v? Higher?
The computers on these motors (I’m guessing) and in most cars now days requires a constant voltage to be seen DURING the start sequence before it kicks fuel pumps, ignition, etc. if there’s something odd about the voltage it doesn’t like it could be causing the computer to hiccup and delay until it sees what it wants (like a voltage drop or rise to the appropriate level)
If gc batteries don’t like a fast discharge the voltage could be dipping during the initial hit and rising back up.
Then when you swap back, I’m out of ideas on that one... did it do it when you had a regular battery on the 2 spot?

[MLA]

two 6V wet cell in series will be nearly identical to a single 12V wet cell. six total plates at roughly 2.13V each. One huge difference is Ah and reserve. A typical cranking battery might have an Ah of about 65 and a reserve of 100. A pair of 6V in series might have an Ah north of 235 and RC of 450.

So without actually seeing in real time with test equipment hooked up, I would not expect a pair of charged and in good condition 6V GC's to be in a voltage or amp to be an issue.

And another thought I just had. Unless the switch is passing through OFF when switching banks, the ECM will not see a loss of voltage as the switch is make before break.

Even a quick pass through OFF should not be an issue as I bet the ECM has some capacitor storage to smooth out voltage fluctuation.

[russellsmojo]

Broke pilot both my boats have done it and I always had factory dual bank. But you are on to something with what the computer is seeing. I suspect it has more to do with fuel than battery voltage.


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[Pound]

my uneducated guess is the complete removal of power during the switch is causing the fuel pump to drop pressure or injectors to bleed down. have you tried pausing the key in the run for a few seconds before hitting the starter, to allow the pump to pressurize.

[kaneboats]

Yes. That is what I was going to suggest. Maybe 2 cycles of the key then crank.

[Broke Pilot]

The biggest problem with all these computer controlled magic boxes now, is they learn. Quickly.
So any slight change could be telling the computer to relearn. They do have capacitors to store info. I’m just guessing with these boat ECM’s but I’d put money on they’re not far off of a factory Ford ECU.
Fuel pressure/injector bleed down shouldn’t be an issue (just a guess). I’m not sure if these boats have a regulated return style fuel system or if they’re just regulated. But either way it should only take microseconds to get the fuel right.
Since these GC batts sound like monsters, I’m wondering if the computer isn’t seeing the normal voltage drop, but accepts it and starts. But like I said, they learn... when you swap back the computers see a voltage drop, freak out, change whatever it changes and continues on.

Kane has a good idea though to check fuel. Do the swap and cycle the key to hit the pump an extra round before you crank. Maybe not seeing a start sequence on the fresh battery swap will help? Isn’t technology fun?!?

[rdlangston13]

Ok so I don't think it has anything to do with the fuel pressure bleeding down for this reason. If I have been running it on bank 2, put the boat away with the switch off for a week, get it back and put it back on battery 2 it will fire right up no problem. This inverse is also true for bank 1. I have not trid turning the key to run, then off, then start. I may do that when I get home and see what happens. It really is the oddest thing. I am glad that Russell has experience this though.

Also Taylor, I never had dual batteries from the factory. We ordered it with one battery because we knew we would be pulling out the stock second battery and putting the GC ones in, seemed like a waste of money.

[Broke Pilot]

I can completely understand that logic! Lol
The computers shouldn’t care about anything other than the voltage they get. Everything is dependent on the voltage no matter where it come from or what it runs through. If it acts normal on the 6v batts once it’s there, then your install and parts are good. It’s gotta be something downstream.
Feel free to bring it up and we’ll hit it with a volt meter and try to see what’s going on.
I’m off til the 1st... I’m bored. Lol