HX-35 Upgrade on 91 W250

[JBenzinger]

I recently purchased an hx-35 off of a 98 dodge and would like to replace my stock turbo very soon. The guy that I bought this from told me to make sure that I restrict the flow of oil on the oil inlet line to the turbo. He said that the stock oil pressure/ flow would be too great for the seals in this HX-35. I have never heard of this. I thought this was a direct bolt on upgrade...



Thanks for you help.

 

[Forrest Nearing]

should be a straight swap

 

[dpuckett]

I agree with Forrest- it sounds like a line of horse squeeze to me. There is an adaptor that screws into the top of the inlet, but that isnt really a restrictor.



If you compare the size of the oil return vs the oil inlet, you'll see the return is quite a bit bigger, allowing oil to flow out faster and not get blcoked and blow by the piston ring- type seals in the turbo.



Daniel

 

[PToombs]

Maybe the turbo is already wasted, and the guy is thinking ahead. "You didn't put in a restricter? I told you it would blow the seals!"

 

[dpuckett]

I had thought of that as well.



DP

 

[TBurow]

i put a hx-35w on my engine without any mods except for shortening the down pipe to fit with the wastegate, no restricter, and no oil leaks, besides dont all cummins have the same oil pressure? anyway it works fine for me and has more power and a louder whine.

 

[TWorline]

I have not had any problems with the seals on my HX-35, it has been on there for 7 months and it came off of a '98 as well.

 

[Greenleaf]

I can tell you with authority and certainty that there is no such thing.



On another note, the HX35 is no upgrade. Please don't waste your time. Sure it may have a bigger compressor wheel (very slightly larger) and a map width slot etc. however, it will serve little as an upgrade. Fact is, you will need something much larger than a hybrid 40/35. Trust my experience and knowledge on this.



It wouldn't hurt to install a large charge air cooler and air intake/exhaust upgrades as well. Ported head will help as well. The combination of Hi-Flow nozzles and mild pump mods on the rotary VE will melt down a set of pistons **IF** you use the power (fuel) available to you. If you choose not to use the power, then disregard all I have said.



Please do not take an advertisement from a turbo shop for face value. A turbo that will support 450 HP is not intended for a first gen engine. You will need to understand air flow characteristics of the first generation engine to understand why. They (our engines) require much in the way of other air flow modifications to allow a 450 HP turbo to support 450 HP.

 

[Moab4x4]

Finally, someone with authority!:-laf

Scott, others with sagely wisdom and insight:

This is another of many areas in which I am totally clueless, so please enlighten or at least point me in the right direction. My goal has been for a solid daily driver with ~ 300 HP that I can use empty or occasionally tow my backhoe (14k).

HTT recommended their stage II 58 mm compressor over the stage III 60 mm wheel for the H1C. From your experience, how well do they know 1st Gens? I see some on TDR recommending the stage III for mild setups like mine. I currently have the 16 cm housing.

When I pull a hill at 32 PSI boost, my EGT's really start to spike and I have to let off. With the mods in the sig, at 4200' elevation, am I just not getting enough air, or is my housing too small? I would really like to understand what the main factors I am running into here are. I would like to better understand the air end of the fuel/air mix.

Thx,

Ken

 

[Greenleaf]

I have been there and I'll tell you how/why.



Years ago I was coached by our own Pator Bob. He set my truck up (per phone converstaions and my wrench turning) The PDR 58mm upgrade was my first turbo. Sure it was fine. I only drove the truck empty. I also used the 16cm turbine housing. It mad a sweet whislte sound and spooled rapidly compared to the 21cm.



He sold me (PB worked for PRD Inc. ) all the gauges and POD's. I noticed that with the POD's it began getting hot. Then, with further fuel mods/refinements, it really began to get hot. Truck empty/daily driver thing. He told me the 58mm upgrade was a pretty good upgrade for like 300/350 HP. But I was getting real warm.



PB used one and so I figgured I couldn't go wrong. He made like 370-ish HP with a really big turbo (this was years ago) like an HX50. He told me it got really hot untill the turbo spooled, then the temps leveled out. But by then the EGT's were off the chart anyhow... .....



So, I upgraded to the HTT Stage III Hi-Flow 60 with the 21cm or the 18. 5 cm turbine housing. Scrapped my 3. 5 exhaust for the 4" and gutted my pumps AFC/reverse lever. Installed a three inch intake pipe. Now things are at melt-down within a number of seconds of WOT



In short, if you go easy on the fuel settings/mild injector upgrade and don't town heavy up long hills the 58mm upgrade is ok. If you plan to run hot injectors with a gutted pump AFC the hybrid HX-35/40 aint going to cut it unless you plan to keep your foot out of it.

 

[Greenleaf]

Sorry, I dun forget the HTT question. No, they really don't know the first gen application. They don't care what engine the turbo is placed upon. They (must) assume that every Dodge has a real big charge air cooler/3" intake pipe and flows air really well.



I have been told several times by various expersts that a minimum turbo for a well tuned first gen engine is a modified HX-40.



If your going to put the fuel to the engine and use it, then look for something with a four inch turbine outlet.

 

[JBenzinger]

Thank you for the input everyone. I think what I have will be just fine for right now. Maybe some rethinking to do before I take these mods too far. Ill see how using the HX-35 with the 4" exhaust and intake and stock injectors works. If (when) I decide to do PODs I will reconsider the size of my turbo. Should be just fine as long as I keep an eye on the pyro. Ill let you know how the swap goes this weekend. Cant wait!



Thanks,



John

 

[Moab4x4]

Thanks GL, exactly what I was looking for. Very educational. I think my pocketbook says to stay where I am for a while.

But I still do have that old toasted 5. 9 in pieces in the garage that I will have to do something with someday...

Thx

Ken

 

[PToombs]

You can pretty much forget about H1C up grades from HTT. I've been on the phone with them several times in the past month. They can't get the castings for the compressor housings any more. I was going to go to a stage IV, they can't get me anything,II, III, or IV. My H1C has only 15k on it, why should I buy a new turbo? Now it looks like I'm going to have to buy something! :{ I've gotta call II and see what they have.

 

[sdstriper]

As far as I know Gillett Diesel Service still has upgrades for the H1C



All Years Dodge

 

[PToombs]

Thanks Ross! Oo.

 

[sdstriper]

No problem

 

[hotram03]

I know some of the newbies on here don't know, and may think some of you who give advice don't really know what they are talking about, but "Greenleaf" does he has helped me just by reading threads to other peoples questions. Just my 2c...

 

[Moab4x4]

I know some of the newbies on here don't know, and may think some of you who give advice don't really know what they are talking about, but "Greenleaf" does he has helped me just by reading threads to other peoples questions. Just my 2c...

Amen!

He has not been helping my fuel mileage. :-laf

But watching that bright yellow Brand X diesel truck disappear in the black cloud was priceless.

 

[Greenleaf]

Hey guys. I forgotten about this earlier, but the latest magazine issue #56 and the following magazine have a REAL good explaination about air flow. It's puts the CFM/density/restriction/pressure drop thing etc. into perspective.



Boost vs Air Density. Read good read. I believe it was under the heading of "Product Showcase"