Changing HP from 475 to 505 by computer safe?

That particular bump won't hurt the motor, but you might as well just buy a 505 to start with then nothing can get screwed up in the ecm

 

Shouldn't be an issue to bump to 505 but if your buying new why not just get the 505 in the first place.

 

Is it an increase in power throughout every gear or is it just an overall fuel surge or a turbo boost or what?

More info!!!

 

All it does is change the way the ecm tells the motor to run, mostly the amount of fuel injected to produce more horsepower. The torque on the 505 is the same as the 475. The motor doesn't care what gear you're in, it's either set to produce 505 hp or it isnt. The dealer will charge something (I've heard 1,500) to flash the ecm, so you might as well buy what you want in the first place

 

Sounds legit. Thanks.

 

If buying new, get one that was built to your power requirements.

The number to check is the torque. Find out what max torque would be on the "turned up" engine. Then verify clutch, Trans, Drive shafts, and Diffs are all rated to handle the torque.

My current truck has an ISX which Cummins says is o.k. to turn up. however the max torque from the reprogramming would be higher than the max torque rating of my transmission.

 

I think what the sales guy meant about getting it from factory is so that the truck can be spec'd to handle those power levels. Its not uncommon for larger companies to order castrated trucks and lighter duty transmissions and axles. Although the engine can handle the higher output, the lighter spec'd powertrain can't. All it would take is to look up the specs on your powertrain to determine if it'll hold up.