Cat 6NZ 475HP and 550HP difference

There might be a slight difference in the turbo but you can turn a 475 up to a 550 without worries.

 

There is no difference in these two power rating as far as engine hard parts are concerned. The difference is the flash file in the ECM. If the truck doesn't have a transmission or clutch rated for 1850lb-ft of torque, CAT will refuse to uprate the file in the ECM. PM me if they refuse to do this for you.

 

I had Milton turn up a motor once. What a waste of time, could barely tell the difference power wise.
It ran fine , just wasn't lively enough for me.

 

As long as Cat sdp brought it up... I have been in 3 trucks turned up by Cat to "550". As he said very little improvement in power but they seem to burn much more fuel for very little power gain. Maybe it's just me???

 

Nope wasn't you, Milton did my 01 to and that was a waste of 500.00!!

 

Most likely when it was updated the most modern file available was used, most likely a low nox file, you were better of with your previous tune, Mr Haneys will be a pre low nox file and would show the proper performance gains.

 

Can any one clarafy when cat do a field uprate . The ones I have seen they set the fls fts to 0,0 as a default value . I think this is also where they loose the fuel economy as well as the low nox crappy file. The two together = a waste of $$$$. Not sure about the par Dyno side of things maybe if they did it that way it would be slightly better for the performance and fuel economy .

 

I second this. OP, you're wasting your time and money having CAT do the uprate. You won't be happy with it. Haney's got what you need.

 

Wat ratio's do yu guys have? That might be the reason y slight difference in power