Is it possible???

ST840

ST840

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This may be a silly question?
But I'm asking anyway. Is it possible to re map a 260hp D4 to 310hp ?
If yes what is involved?
 
I think there are a few tuning companies who claim to be able to do it, not sure I'd risk it though.

Youd also need a new prop to take advantage of the increased power.
 
I’m surprised it’s not more common in boats, especially the remap to increase efficiency. A lot of engines are programmed with ECU’s that cover a huge range of ambient temperatures and other conditions but most people only use them in fairly consistent mild to warm days and in relatively flat water.
 
My initial reaction is that; if you want a D4 310, then buy a boat with a D4 310. I would be very wary, as above, it's a very expensive engine if it goes wrong. The remap firm will promise the earth but will they stand by you if the gearbox or other components fail? It may only be a 20% increase in output, but if everything is built to that then the added power maybe too much. Maybe fine.
It's knowing what tolerances are built in, whether they are at their limit at 260hp or if they would take 310. The guts of the D4 may be the same as the 310, but you would need to be very sure that the crank, flywheel, fuel pump, cooling, etc.. are the same. Not to mention your engine beds, gearbox, prop shaft, bearings and prop. Extra torque as well as hp.
On the farm we have had engines remapped and all caused problems and cost us. The Case blew the main forward clutch pack in the gearbox. A new Massey Fergusson - that the dealer remapped pre-delivery without our knowing - blew the main gearbox. £5K rebuild. And a John Deere ended up running so badly that we have it put back to the factory setting. All of them powerful, quality modern engines.
 
ST840 said:
What problems could arise potentially ??
Click to expand...

The Remapping may be pushing the components on the 260 hp engine outside what they were designed to do in order to get 310hp. So whilst it may be possible to get 310hp out of a 260hp engine, it may not last as long. For example if you look at the part numbers for a 260hp d4 injector it is a different part number than the one used on a 300hp d4. There will probably be other hardware differences between a factory 260 engine and a factory 300 engine.

And then you're reliant on the person who did the Remapping doing it well and accounting for all the scenarios you might use the boat under.

Its your money, your risk, but I wouldn't do it.
 
To add, I've had a car engine (petrol turbo) remapped, and whilst the increase in power was impressive, and the actual engine seemed to handle it fine, the other bits around it started to fail in short order, things like the clutch started slipping, then a flysheel failed, then a cv joint failed, at that point I sold the car.

All the people of the forums before I had it remapped were saying the particular carcould handle a remap with no problems, they were wrong in my experience.
 
we remapped an engine on a large piece of farm kit went well for a while but then failed very badly needed a new engine so i wouldn’t bother if i were you
 
This is a theoretical question to see if it's possible or not. It's not an engine I own, but in the quest for the next boat, I've seen one I really like but it's under powered compared to the specs max rated engine size for the boat. Max being 310, fitted is 260.
I wasn't sure if the engines were the same but just re mapped for different power delivery. I will forget the boat and move in. Many thanks for your input! ??
 
You will need to do a lot of research before making a decision.

A) you may be lucky and they may be identical mechanically with the 310hp being a leisure version mapped with more fuel to run at higher rpm and loads for shorter periods and the 260hp a commercial version mapped to rev a little lower and run for longer periods.

B) Or they may be completely different with smaller turbo, intercooler, cooling system etc. in which case an upgrade will be much more complex.
 
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