So here's the deal. Truck is an 02 with a built auto, 120k miles and edge comp with tapped wire, stock injectors. After tons and tons of reading I decided that upgrading to an hx35 would be better for the truck and just make the truck better overall but I honestly don't know how to feel about it now that I'm doneThe truck makes way more heat on the egt's. Like everywhere but way up high in the rpm range. With the stock injectors and pinned I can only just barely touch 1250 unloaded but this was impossible with my hy. and whereas my hy made a max boost of maybe 20 the hx makes about 37 max psi.whats going on here? I get more heat, less spool up down low. Higher cruising egt's and lower crusing boost pressure just running unloaded down the highway and the only improvement I can see is when I'm pushing it hard but even that is next to nothing (more air but doesn't feel any different, same max temp), certainly not worth the cost.Any thoughts here guys, should I just put the hy back on and be done with it? Currently I'm not hauling or towing so its just unloaded highway driving but it feel less responsive but with similar mileage and higher cruising temps? No boost leaks anywherethanks for your help guys

Ok so for testing it looks like I'm about 55mph = 0 psi 65mph = ~3 psi 75mph = 6-8 psi I'm starting to think that I was just expecting it to spool closer to how the hy did and that simply isn't going to happen. I played with it a bunch more and found that it really does give a lot more of a hit when I'm doing top gear acceleration passes so that is more like I would have guessed. The heat thing is a bit weird but i'm chalking that up to no boost until it gets more fuel. Seriously I can't thank you guys enough for your time and your help figuring this out. I'll revisit the issue again when I get some small injectors put on there and see if that helps it spool down low. Thanks again guys, you really have been great

I get about the same boost numbers. Still, I would look for boost leaks and possibly reevaluate the turbo's condition.

my 4.10s at 65mph this morning on 245/75s was carrying a steady 5-6PSI boost on level ground.

97 12 valve, 4.10 gears, 285/75/16's, stock HX35, boost elbow at 32psi, 100 plate set in middle, star screw so I get a slight haze on full throttle , 4" turbo back exhaust, I run 1900 rpms @ 65 mph = 6-8 # on boost , 8 is with a slight grade . EGT @ around 650-750. Put it to the floor I can hit 32psi boost and 1450 egt.

Ok that is a bit of a thinker, I'll get out there and look at it now. Where would be the best place to check for leaks, is anything common, I only had to mess with the one boot changing the turbos out and I thought I got it clamped down pretty good. Not much I can do about the gauge but if there's a good test for a boost leak I'm ready to give anything a try

I have found the lower passenger side boot with a hole rubbed into it by the inner fender on 3 different trucks now, mine included. Couldn't hear any leaks driving and didn't really notice any significant power loss unless I was towing. I am really interested in what you find, I've been trying to decide on a turbo upgrade to get rid of the hy on my truck but can't seem to make up my mind. I am seeing 4-6 psi at 55MPH. When I keep it floored, even on level ground, I can peg my EGT gauge (1500 degrees) and hit 42-45 psi of boost pressure.

I'm also interested in your findings. I'm thinking of doing a budget friendly hy35 to hx35 upgrade in the near future

What is the best way to tell what turbo you have stock? I was told mine should be a HX35 from the factory. 98.5 with automatic. What are the identifying marks on the unit?

What is the best way to tell what turbo you have stock? I was told mine should be a HX35 from the factory. 98.5 with automatic. What are the identifying marks on the unit?

On the data plate it should be clearly stamped either HX35W or HY35W...Holset is really good about stamping the model information the compressor housing data plate.

Thanks, I will check tomorrow. I have no intention of changing since it pulls like a train now.

Depending on the boost leak it may or may not show up on the boost gauge. I've had a few small leaks that would not effect the boost numbers but with leak tester you'd hear the air whistling out of the clamp or boot.

Can an HX35 from a 12v directly mount up to my 2001 or do I need one from a 24V?

Hx35 is an hx35 from a mounting perspective.. Only real differences are the exhaust elbow at dp and wga signal. Sent from my SPH-L710 using Tapatalk 2

Should .... Both same exhaust housing and T3 .... Pretty sure the exhaust flange is same

Some of the HX's come with a v band to clamp the exhaust and others, like mine, bolt up. seems the v band is more prevalent I think. I have not seen that many to know, just basing this on what I have seen and read here.

Ok so for testing it looks like I'm about 55mph = 0 psi 65mph = ~3 psi 75mph = 6-8 psi I'm starting to think that I was just expecting it to spool closer to how the hy did and that simply isn't going to happen. I played with it a bunch more and found that it really does give a lot more of a hit when I'm doing top gear acceleration passes so that is more like I would have guessed. The heat thing is a bit weird but i'm chalking that up to no boost until it gets more fuel. Seriously I can't thank you guys enough for your time and your help figuring this out. I'll revisit the issue again when I get some small injectors put on there and see if that helps it spool down low. Thanks again guys, you really have been great

am i wrong in thinking that u would have high egt's when u have a air flow leak? i would consider checking ur exhaust manifold for cracks and the gaskets on both sides of the manifold i don't think a turbo diesel should ever be at 0 psi....that's naturally aspirated....at highway speed:banghead:

Did you hook up a gauge?