Turbo Classifications???

[Coop]

I see numerous threads on the turbochargers in our Rams. What is the difference between the HX, HY, and any other common ones? What is the 35 or 40? Boost?



Thanx,

Coop

 

[SLang]

I can't give all the details but... HY and HX are series of turbos. It's like a Ram 1500 and Ram 2500. They seem to be the same on the out side but have different performance spec's.



The HX-35W is what's on our truck. The "W" stands for wastegate. I do not believe an HX-35 exists? The HX-40 is factory turbo for our 5. 9L's big brother the 8. 3L. The 35 has a 3" output for exhaust and the 40 has a 4". You can get the 12,14,16 cm housing for either. With the same housing the 35 should spool up faster. It has a lighter impeller. I believe when you cahnge tt the 40 you loose about 4 PSI of boost at a given RPM. Not positive about that.



Do a search for "HX-40" and you'll find some good info.

 

[Coop]

Thanx. I think I stick with my 35 for now.

 

[ToolManTimTaylor]

+

HX = Adjustable wastegate Hy = NON adjustable wastgate hardline. and there is an HX~35 avail with 12 14 ( I think I saw a 16) housings.

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[Wcr25]

Re: +

Originally posted by ToolManTimTaylor

HX = Adjustable wastegate Hy = NON adjustable wastgate hardline. and there is an HX~35 avail with 12 14 ( I think I saw a 16) housings.





Well, that is true but not the entire story! The HX also is a 12cm Turbine housing and the HY is a 9cm turbine housing. The HY's are only on Automatic transmission 2001 trucks. I guess someone @ DC thought it would be better to have the smaller turbine housing unit on the auto's because it spools up so much faster than the 12cm housing unit. Also something to do with letting have both manual and auto ETC motors have 235 HP for 2001.



This is all very true until you start bombing. After you turn up the boost over the stock 20, then the 9cm housing starts to make too much exhaust manifold back pressure, I. E. Drive pressure. It probably will never make over 30 psi no matter what you do and the excessive backpressure drives egt's up in a big hurry. Check out earlier posts over the last year on HY's and you will find alot of guys have swapped in the HX units for the HY's. One caveat here is that you have to change the entire turbo, the center sections and turbine housing mounts are mutually exclussive to the two but they are a direct unit swap.



Todd

 

[Coop]

So, when I start to bomb, I'm going to have to change out the turbo. 9cm sounds awfully small. I was thinking that the 14 sounded like a good one to go with, but now I'm concerned that I'll lose my quick spool up ability (which I'm happy with). I beginning to think that I shouldn't bomb this one, but buy a new manual 4X4 next year. I'm really looking for the true 4 doors.

 

[ToolManTimTaylor]

Oh yes it will,

I am running 38 psi out of my HY and it's true my egt's (With the DD's and Va + bank's) rise 'ala quicklike. I am going to swap in a HX~35 with a14 cm housing because I make tremendous system backpressure as is now with all that exhaust trying to fit thru 9 cm's

 

[Coop]

Are you going to use one of the Piers modified turbos? I don't think the extra boost is a good trade off to slower spool-up times. But, then again, I'm stock.

 

[KatDiesel]

Re: Oh yes it will,

Originally posted by ToolManTimTaylor

I am running 38 psi out of my HY and it's true my egt's (With the DD's and Va + bank's) rise 'ala quicklike. I am going to swap in a HX~35 with a14 cm housing because I make tremendous system backpressure as is now with all that exhaust trying to fit thru 9 cm's

Have you tried "lowering" the boost somewhat? You out of the "effciency" range of the HY35 at 38psi of boost. Therefore the turbo itself is generating some heat. Knock the boost down to 30psi and see what happens? Just an idea... ...

 

[KatDiesel]

Originally posted by Coop

Are you going to use one of the Piers modified turbos? I don't think the extra boost is a good trade off to slower spool-up times. But, then again, I'm stock.

Its not really the extra boost your after. It does help with cooling EGT's. . to a certain point. But, each turbo has an effciency map, when the turbo is out of its effciency range its spinning so fast and is more then likely generating heat. Piers turbo moves more air there for has a different effciency range then stock would. Just like on an HX40 it has a bigger compressor then stock..... so say at 25psi boost its moving more air then an HX35 at 25psi of boost.



Does that help at all?

 

[ToolManTimTaylor]

Eric,

Yeah I know I am outside the efficiency envelope and actually have throttled back a little bit on the boost mod (Hardline allen grub screw identicle to a Carb Jet) when the injectors went in boost actually rose 2 lbs and I noticed the turbo started to make more of a Labored whine (Possible over rotation for the hy?) so I opened the "Jet" by means of running another pilot thru the hole and brought it back to Bank's spec of 38. However I am swapping the Hy out in favor of an hx with a larger housing (Sure lag + 93 tc might be a little worse off the line) but I should see lower egt's and be able to stay within a broader boost range than that of the hy. it's all in the name of VOLUME ... . not pressure

 

[DieselPuff]

KatDiesel

• 
  

Just like on an HX40 it has a bigger compressor then stock..... so say at 25psi boost its moving more air then an HX35 at 25psi of boost.

Not quite... RPM and boost pressure determine volume, not the size of the compressor. A smaller compressor (HX35) must turn faster than the larger compressor (HX40). Hope this clears things up.

 

[KatDiesel]

Originally posted by DieselPuff

KatDiesel

• 
  

Not quite... RPM and boost pressure determine volume, not the size of the compressor. A smaller compressor (HX35) must turn faster than the larger compressor (HX40). Hope this clears things up.

You just said it better then I could. That was my point a smaller compressor has to work harder to move the same amount of air as the larger compressor. Couldn't think of anyother way to say it at that time. The larger compressor has a different effciency map. Sorry for the confusion, I posted that about 5 minutes after waking up today.

 

[Wcr25]

Originally posted by Coop

So, when I start to bomb, I'm going to have to change out the turbo. 9cm sounds awfully small.

Well, that depends on how much Bombing you're going to do. Look at my signature above, I have an EZ box, 275 injectors and a DTT 91% TC and towing valve body. The Box and 275's woke up this bad boy and it feels like a 7000 pound sportscar! I even spanked an Audi A8 from a stoplight. You should have seen his face! BTW, I'm set at 30 psi boost and it likes it real nice.



Todd

 

[Coop]

Well, a TC and VB are my first concerns. I had a 94 CTD and the trans went out at 75K, so I'm a little worried about that to begin with. After that, gauges, a PE and injectors. I know I say that'll be enough, but it probably won't by then. I'm still debating to get rid of it, and get the 4X4. I never saw a worse truck in the Chicago snows that this thing. Too much torque, I figure.