Increasing HorsePower -- What You Need To Know

[Rawze]

(10-24-2016 )Jarhead79 Wrote:  I have this a 2011 isx 450hp/1650tq can't find cm number on valve , but cpl 3719. I'm looking to see if I can get help to make some more power, and make the thing run "right" without the EPA. I do not have the insite yet. What are some options? If I knew where to go for help and tuning. Also how long after a inframe is recommended its been about 4,000 miles since fixed after liners dropped due to carbon build up. I'm open to any suggestions. Not familiar with def trucks, or isx. Thank you.

2011 was the year they started making trucks with CM2250's in them. Does your truck take DEF fluid? -- if so, it is a CM2250, of NOT, it is a CM871.

Carbon buildup/packing causes a LOT of problems, but is not always the cause of liner height issues themselves. Carbon packing can easily cause the piston rings to become tight and cause pre-mature liner wear resulting in excess blow-by issues (and therefore relentless Emissions issues, cam wear issues, etc.). It is more rare for it to cause liner dropping issues though, but not impossible. Most of the time liner height issues are the result of injector issues, or how it is driven.

Elaborating further on this ...

A lot of ISX engines that have liner issues, do so because the way they are driven. Everyone seems to be hell bent on making lots of power and pushing their truck up every hill with the torque maxed out at 1500 RPM or below. The reality is that they should be ABOVE 1500 when pushing the engine (more like 1600-1750) when heavy torque is requested to prevent these same kinds of problems. Most of the time, it is the history of the truck and how it is driven that determines liner issues. Cruise control and a lazy driver that does not down-shift until it is down in the 1200 RPM range are its worst enemy.

As far as carbon packing goes,...

Regular EGR tune-up work BEFORE any excess soot problems, check engine lights, regen issues, etc. start setting in, along WITH some kind of bypass filter for keeping it out of the oil is required. It is either that, or having it de-mandated and putting the latest version of MM-2 in it properly (not legal in the U.S.A./Canada) in it and being done with it.

Back to the question(s) ...

Everyone always wants more hp from their truck. You say it was just inframed and counter-bored, but did anyone bother to raise the liner height on all the cylinders so that it can take a bit more hp? --- There are very few places that I know would do this correctly. Most just put back the same height and that means that you are no better off than before as far a risk vs power vs liner issues again. -- keep that in mind when talking about more HP.

What WAS, and now IS the current liner height? Did they do ALL cylinders? Or just the one(s) that dropped? Did they use Stainless, Iron, or Brass shims when correcting the liner height? -- ALL of this is relevant information to know when discussing HP on an engine that has just been inframed. As well, what steps are you going to take so that the same issue does not get repeated in the future?

-- If it is custom tuning you want, legal or otherwise, then I would suggest giving me a call sometime for some solid recommendations. I PM'd you my number.