(06-18-2018 )Roberts388 Wrote: First sorry for the long post.
Truck is a 2018 pete 388, yes its a 565/2050 X15. I was thinking it still might have been cm2350 as thats what it says on the ECM. Running tankers n dry bulk in the northwest up to 105,500 gross.
Its been de-mandated. The guy tuning it apparently used to tune for Edge so he know cummins/duramax/powerstroke. He's tuned several ISX's but this is his newerst one. My good friend owns a high performance diesel shop and he does all the tuning for them. He used the factory 605/2050 tune and guess bumped it up around 10% in hp and tq. Truck runs awesome, oil is actually staying honey to maybe dark honey brown and Im only on my second oil change sense the exh changes. Running ruffly 300hrs or 10,000 miles on an oil change, but fighting with the turbo. Ive got a pyro in the manifold and dont see anything over 900* untill 1550rpm then it climbs to 11-1200 and thats it. Factory boost gauge runs 20-30psi most of the time but hard pulls its up to 40-42. Seen 50psi once on an onramp/over pass in Portland when my load hit the rear of the trailer and loaded the engine really hard.
http://www.myholsetturbo.com/manuals/hol...nspecs.pdf According to the holset website the HE400 is only good for 280kw or ruffly 375hp where as the HE500 is good for 420kw or 565hp. I drove a 2013 ISX set at 450 before this truck and never heard exh flowing thru the egt cooler but with this engine I could hear exh flowing through the cooler at anything over 1500 rpm and 20 psi. Sense that it shut off now all the exh is driving the turbo and causing high boost pressures. We are still working on opening the VGT more but Im thinking that this charger is just to small for this engine. The guys tunes have very very very little smoke. Like taking off in 4th gear at 45,000 pounds empty and I can floor it and get almost 0 smoke.
Ive been around performance diesels sense 2002 so mods are nothing new to me. Goals for the truck is 575-600 to the ground and use it all day long and keep the EGT's fairly reasonable and MPG in the 5.5ish avg. long heavy unaerodynamic truck n trailers with losts of unload idle time at 900-1400 rpm. As to what leads me to believe the charge air is running to hot is the compressor has turned from the bright cummins red to a very dark maroon color. Hoping with the HE500's bigger compressor and exh housings we can get the turbo maps to actually match the airflow of the engine. I see PukeDits has a set of compound turb's for these engines but Im trting to avoid going that route at the moment as with a short hood my 5 pound bag is all ready kind of full on that side of the engine.
im sorry but there is so much wrong with this post im scared to even start.
The X15 can do 650-675 crank on its stock turbo, slightly warm but can be done. It does not need 40+ psi to make that power which is why you are getting so much pyro. your choking it off creating unneeded drive pressure and heat chasing boost psi - its all about flow. The fact that your charger has turned black scares me and im scared for you. 50+ psi on a engine thats over 19:1 compression ratio is terrifying.
With a He561V installed on a 2350 or a X15 it can support 800 wheel HP and run respectable EGT's. Its all in the timing, fueling, vgt position, etc. It sounds as though you want to do it right, But if the ECM logic is beaten with a sledgehammer to do your bidding you lose full control of it and unpredictable results happen.
My 0.02 but again im usually full of shi#t so take it for what its worth.
