Can the merc 250 v8 be remapped to a 300?
 

I think I read all the internals are the same that only the mapping was different between the two engines. Thanks in advance for any info, RM

Not legally.

Was it legal to remap the verado inline 6 engines? I saw numerous threads on remapping those. Thanks

What law is that??

For warranty sure , but not sure if a legal thing. Emissions maybe ? Are the emission police that bad ?

i want to do it after my 1,000 hour warranty expires which should be in 230-240 days from purchase.
who is offering this service? Thanks

Wish I knew. But none of the shops who used to be willing to flash Verados are willing to do it anymore. Mercury and the EPA have aggressively shut it all down and their effort seems to have been effective.

As noted above...very few mainstream shops will do anything like this now. Look what happened to Diesel Brothers, for example, in the truck world.
Many, many, years ago (think mid/late 70's) when cars were starting to be equipped with catalytic converters, there was a local shop that would install "test tubes" that replaced the cats for...you know...'testing' purposes. Guy made a name for himself until one day he gets busted, all assets (including his home) seized, fines and jail time ensued.
Point being, the risk outweighs the reward and especially these days, the government agents hang out on forums just like this, waiting to snare some poor bastard.

As for CAN it be done, i.e. make the tune deliver the ponies...I don't know, but if it's simply a matter of altering injector duty cycles and timing, etc...then it seem logical it COULD be done. If it HAS been done, and one can get one's hands on the tuning equipment, and do it himself...one would be golden, and unlikely to ever get caught in some random check...as long as that person was smart enough to NEVER say anything about it publicly.

Taking a 1,000 hour engine and increasing its power by 20% would surely put more stress on everything. I reckon you’d considerably shorten the remaining lifespan of many components. They don’t get stronger after 1,000 hours of use. 🙂

Could it be done….? Probably, but in commercial use, I think you’d regret it down the track.

RR

I thought both were NA, seems like a lot of HP out of just a tune.