Need turbo advice please...

Hey guys! So I have a 98 IH 9300 with a CAT 3406E(6TS). It’s healthy and seems like my turbo isn’t allowing the engine to breathe as well as it should. My egt’s are around 900 post turbo while cruising with 90k of weight at 65-67mph(1500rpm, 3.70 gears). Boost roughly 10-15psi after CAC.
The turbo is a 132-3649, 1.41 turning AR. Also running stock manifold. EGT’s I’ve had go up to 1000* on a hard pull, boost can hit 30-35psi when I’m running my split shift down from OD and rpms in 16-1700 range.
I’m just curious if I’m close to the correct turbo or should be looking at upping the turbine AR a size larger? I typically run the truck around 1500rpm all the time. Lug it down til around 1300 lowest. Go to 16-1700rpms highest for a downshift pulling a grade.
Running out of ideas to cool the ole Cat down some. Maybe I feel it’s too hot when it’s not?

 

The file is probably the biggest factor. What I was told it would make 600hp at 2100rpm, and 2000ft lbs at 1200rpm. I honestly am about ready to have it cleared and downgraded to 475hp or somewhere in that range if I can’t figure this out.

 

Ya that 30-35psi I usually hit around 1600rpm, probably hitting the HP range and exiting the torque band.

Yeah I was looking into a better flowing manifold for awhile now, time to pull the trigger on it.

I forgot to mention that the engine has a stock cam and the reman injectors(8501’s).

Superhauler: how do you like the 1.58 housing? Looked into a time before. But thought I might end up moving the powerband up too high for my cruise speed or a lot of lag. Don’t really have any lag now.

Had looked into a Switchblade turbo form Blaylock with a larger housing. But haven’t heard a lot about those and felt didn’t want to try a $2500 plus turbo and find it did the same thing the current one I have does.

 

10-4 Superhauler.

Great information guys, I appreciate all the knowledge/experience you all have! Helps a lot. I was always thinking to myself am I pushing the engine too hard and do I need to change something or not. I’ve always been told that the 3406e I should lug down a ways before a shift(12-1300rpms) but it just didn’t seem to feel right with this engine I have. Seems it’s sweet spot is around 1500-1600rpms.

I will get an aftermarket exhaust manifold to help it flow better. Also just got done changing the thermostat down to 180* from 190*. That’s what it was before the reman engine was installed. Should help in the higher ambient air temps.

I’ll keep running it like it is. Knowing it’s how it should work. But I will keep a turbo in mind as it’s got quite a few miles on it, and seeing some more play on the shaft.
Might try a non waste-gate turbo this next time vs this one now.
Thanks again everyone, I appreciate the help!