350 HP 12.7? How much can it handle?

When I had the ISX opened up by cummins. I was hoping for 500 or better. But I was told I couldn't go any higher then the rating.
450/475.

Needless to say. When they were done with the wipe and reload. It was a whole different animal. I was very happy with the max 475.

 

As I said earlier, it's about staying in that efficiency range.

So yours is an MK28. It has the 8309 cam (which is really good). The difference between it and a 470hp MK60 is the MK60 has a GTA4292 with a 1.28 A/R housing and yours has a GTA4294 with a 1.15 A/R housing. The MK60 also has 7045 injectors and yours has 7099 which is 2 sizes smaller.

Your block was drilled for piston cooling nozzles but they're blocked off...easy to install them by dropping the pan when doing an oil change and they're about $60 for a set. The 8309 cam was used in the last 500hp BKs so you're good there. You could put the 7045 injectors in it for 470/1550 or a set of 7650 injectors for 500/1650. Your turbo will work just fine at that hp.

Without flashing it to a BK calibration it won't be exactly that hp/tq because it's fine tuned for an MK28 but as long as you set your ecm to the highest setting it'll be pretty close.

If that's not enough, you can easily get an aftermarket tune to 580/1850, change turbos, install 7014 injectors. It's a good block...the sky is the limit

 

Hi there i"m new to the forum, looking at buying a 2001 freightliner with 12.7 detroit ser#06R0628010
owner says its 430/460hp is this engine capable of being turned up any higher? can it safely handle around the 500hp 1800trq range? any info is much appreciated thanks

 

According to the serial number it's a 500/1650 BK. It'll easily take 1800tq