Idk if this is as much as an issue as figuring out what I have. Bought my truck in February and from what I knew it was stock except for a clutch and exhaust. After some mods my truck is running amazing but my egts were getting high. As I save money for injectors, I was looking at installing a boost elbow. Start researching and see my truck should have a hx35 on it. After looking at my turbo while I was bored at work last night, I find it doesn't look like one. It doesn't have a normal Holset data plate or the elbow that screws out of the compressor side that leads to the wastegate. It has Holset casted into the material as well as part numbers. It just doesn't seem right to me. Any one have an idea what I have? Possibly fake? I tried running the numbers through holsets website and got no results. I'm going to run to Cummins and see if they tell me what's going on if no one on here has an idea.

 

no data plate on the compressor housing, or on the center piece between the compressor and turbine?

 

The stamped numbers were unreadable on the housing. Spent over an hour online put finally found its a HY35. But I thought those were only on the auto transmission Cummins.

 

they are unless someone foolishly swapped one on there...

spec differences:

hx35w: 56/60/12cm^2
hy35w: 56/58/9cm^2

while the compressors are virtually identical, the turbines are very different. the hy35 tends to choke down the exhaust too much causing excessive drive pressures when trying to drive the turbo over 32psi, where an hx35 can handle 35psi within it's efficiency range before the gate really needs to vent excess drive pressure.

hy will get hot faster and make less power where the hx will take longer to get hot and support a bit extra on power....

 

So should I go with a complete different turbo? Or just change the turbine side. I've been seeing hx35s on eBay for sale but just know know if I trust one of those

 

what boost #s do you see? what EGT temps?

 

If I climb a hill hard I can make 22 pounds and it climbs to 1300. I try stay under 1200 as much as I can. Then on the highway cruising about 65 on level ground ( which there is little of in PA. ) I'm around 10 pounds and 750 to 800.