Anyone swapped an HY35 for an HX35?

[zman]

I have been considering swapping the small HY35 turbo for the HX35 in preparation for a BOMBing run to allow me to pull some heavier loads. Anyone made this swap yet? If so, did you notice any EGT or SOP improvements? If nothing else, I will be able to change housings with the HX. I haven't seen any housings for the HY yet. #ad


Steve


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2001 2500 SLT QC LWB 4x4, AT, 3. 54 anti-spin, tow package, camper special, snow plow prep, travel group, SRW, RKE, fog lights, bright white / agate, Cody gooseneck hitch, silencer ring?, A-pillar mounted VDO Vision EGT, transmission temp, and boost guages.

 

[Archive]

Originally posted by zman:
If so, did you notice any EGT or SOP improvements? I haven't seen any housings for the HY yet.

<font color=blue>When you goto the "bigger" housing your going to lose some of the "quickness" on turbo spool up so you will not gain any SOP. You will however lower your EGT with a bigger housing. I have not personally done this swap because I am going from the HY35 to the HX40 eventually. However depending on how much you BOMB it you might be able to "cover up" the loss of the low end.

You prolly won't be seeing any housing for the HY35, its "rumored" that on the 2001. 5's they have gone back to the HX35 w/12cm&sup2; housing. I have not personally seen this, just what I have heard. So that would mean only the 2001's have the HY35 #ad
Almost makes me wish I had waited and I could have got the 4 wheel disc and the HX35, heck maybe even an ETH #ad
<font size=-2>

[This message has been edited by KatDiesel (edited 12-06-2000). ]

 

[zman]

Kat-

Thanks for the info - pretty much what I figured. No SOP but some EGT improvments. I will be adding an EZ in the next couple of weeks, then some transmission upgrades, 4" exhaust, and finally, injectors. Seems like an HX35 with a bigger housing would be sufficient for that level of BOMBing. An HX40 might be overkill for me????

I know how you feel regarding the 2001. 5. I could have waited just a couple of months and at least had the rear disks. I've heard the rumors regarding the HX in the . 5's, but haven't been able to confirm.

If it seems like an HX35 (with possibly a housing upgrade ini the future) would be sufficient for my needs, does anyone have one (low hours) that they would like to part with?

Steve


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2001 2500 SLT QC LWB 4x4, AT, 3. 54 anti-spin, tow package, camper special, snow plow prep, travel group, SRW, RKE, fog lights, bright white / agate, Cody gooseneck hitch, silencer ring?, A-pillar mounted VDO Vision EGT, transmission temp, and boost guages.

[This message has been edited by zman (edited 12-06-2000). ]

 

[Marco]

I've ordered a HX 40 VGT for my babe.
If you can wait until I'm done, you can
have my stock HX35 if you want.

 

[Bob Wagner]

I will be swapping out my HY35 to HX35 sometime in the near future. Thanks Rob #ad


NW BOMBers are the best

 

[zman]

Marco -

Thanks for the offer. I sent you an email. How much HP/TQ are you putting out/planning to put out with your truck?

Steve

 

[Marco]

How much HP/TQ???
I Don't know!
All I can say is that I want more!
Once I've got more, I want more and more and more.
I guess I have some problem with my ego. What do you think should I have some converstion with an Doctor??
I guess the name of that dissease is something like HAVACness, HAVACnite or something like this. #ad


Seriously, way over ..... don't know, more,more,more #ad

 

[Blackdog]

ZMAN, I swapped my HY 35 w/10cm housing for a HX 35 w/12cm housing. The 12cm housing does not heat up quite as fast and it seems like when it get to about 1100-1150 degrees it'll stay there in that area and wont heat up much more than that. I dont think I lost any quickness at all, at least none that I can tell. If you are wanting more you will deffinately have to change to something other than the HY 35. My truck is running at a pretty high power level and it seems to do ok for now. Probly change it again when I go with BIGGER injectors and a competition box. Good luck to you !!!

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• 2001 Cummins, Black, QC, SWB, Agate Leather, Every Option Available
• 3:55's, Auto, 4x4, 2. 5" Skyjacker, 33x12. 50 BFG Mudders on 16. 5x9. 75 Weld Super Singles
• JVD Torque Enhancer, Big 425 hp Injectors, Boost Module, HX35 w/12cm housing non-wastegated, High Stall Pro Torque Convertor, Performance Valve Body, Silencer Ring removed
• No Muffler, No Resonator, Isspro Boost/Pyrometer Guages mounted on A-pillar
• Dee Zee Diamond Plate Toolbox, Bed Rails, Tailgate Protector, Chrome Rocker Panels, 4" Chrome Tip
• Cobra 29 Sound Tracker Night Watch CB

 

[Steve Campbell]

Someone posted a thread about polishing/deburring the exhaust side of the turbo. Would that, in effect, increase the size of the HY or HX housing giving a partial decrease in EGT?

 

[zman]

Blackdog,

Thanks for the info. It sounds like the HX35 is a good bet for my upcoming HP upgrades. Did you put the HX in before or after your HP upgrades? If before, what was your impression after the swap?

Steve

 

[Blackdog]

I put the HX on afterwards and from what I can tell I didnt lose any quickness, but it does help me to run lower EGT's at a higher RPM. I like the setup I have right now really well. Probly will leave it like this for a while. Good luck !!

------------------

• 2001 Cummins, Black, QC, SWB, Agate Leather, Every Option Available
• 3:55's, Auto, 4x4, 2. 5" Skyjacker, 33x12. 50 BFG Mudders on 16. 5x9. 75 Weld Super Singles
• JVD Torque Enhancer, Big 425 hp Injectors, Boost Module, HX35 w/12cm housing non-wastegated, High Stall Pro Torque Convertor, Performance Valve Body, Silencer Ring removed
• No Muffler, No Resonator, Isspro Boost/Pyrometer Guages mounted on A-pillar
• Dee Zee Diamond Plate Toolbox, Bed Rails, Tailgate Protector, Chrome Rocker Panels, 4" Chrome Tip
• Cobra 29 Sound Tracker Night Watch CB

 

[zman]

OK, this may be a stupid question. Once I swap in the HX for the HY, can the wastegate activation be adapted for the HX35? I'm not sure why I would want to do this - given that some BOMBing is in my future. Just curious, I guess. Any thoughts?

Steve

 

[zman]

Bringing this back to the top. Anyone have an answer for my previous post? Only reason I'm considering it is to keep things as stealth as possible when in for warranty work. It is easy to unhook the EZ, but that might set off an overboost signal under heavy exceleration if the wastegate is disabled.

Steve

 

[Neal Cassady]

Steve,

If you swap turbos I don't think anyone at a Dodge dealer would be smart enough to notice. It seems as if a lot of the later trucks have come with either a HX or a HY. If you purchase a complete HX I think it will come the non-hardlined style wastegate. Then you can add one of the boost module/elbow kits.

Dave

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2001. 5 QC LB 4x4 Auto 3. 54 Everything but Leather Bright Silver Metalic ARE K Series Diprocal EGT, Boost and transmission Temp in an Autometer Dash Pod

 

[jaybo]

Gentlemen:
I have experimented with the HX35 replacement on a friend's 2001 4x4 long bed auto; it had an HY35. We started out stock but have installed 275 injectors and TST's Powermax. Here's the lowdown:
Installed 275's 1st. Only slight discernable hp increase and no EGT changes.
Installed PowerMax. No change at 0 setting and about 100hp increase at 9 setting.
EGT's at 9 can easily exceed meter maximum of 1500 degrees (pre turbo). 3 setting is about all it can take towing big loads and keeping EGT's under 1300. Stock HY35 (with TST waste gate spring attachment to delay waste gate opening) spins up much earlier (1400 rpm) and makes that gawd-awful spindown noise whenever throttle is released, even slowly. Worrysome.
Decided to try an HX35 with 16cm housing with no waste gate. Throttle response change is negligible. Turbo spins up at 1700 rpm and spindown noises are nearly gone. EGT's can still peg the meter at 9 setting but seem reduced about 100 degrees at 3 setting. LESS EGT improvement than anticipated, but it behaves much more civily. Added 4" exhaust. No EGT improvement; more noise; *****in look. (money is no object here).
Truck top speed now limited to 92MPH by fueling. Cut WH/ORG wire to ECM pin 43 (VSS lead), truck now goes as fast as you want. Now we try HX35 with HX40 compressor wheel from Majestic Turbo (Waco, TX). EGT's drop 100 more degrees; can now run 5 setting towing. Turbo spindown is alarming again but Kevin at Majestic says ignore it. BOMB on... Finally tried an HX40 compressor in an HX35 turbine that was machined to relieve backpressure. WOW. EGT's dropped another 100 degrees, and spinup began at 1500 RPM. Spindown was intolerable even while babying the throttle down, resulting in bucking. No good for drivetrain! Had to reduce fueling to make it user friendly so went back to stock HX35 with 16cm housing.

In summary:
The HX35 provides 100 degree EGT improvement over the HY35 by increasing compressor pressure (boost): The HX35 compressor is larger than the HY35.
The HX35 turbine side (backpressure) is practically unchanged from the large single hole HY35 turbine side, even with HX35 large 16CM housing.
The HX40 compressor/ HX35 turbine provides another 100 degree EGT improvement, again because the compressor is larger. The turbine is of course the same.
The HX40 compressor with the machined HX35 turbine provides another 100 degree EGT improvement, but the throttle is so hairy with heavy fueling that deceleration when towing is very hard to manage due to jerks in drivetrain from uneven turbo spindown.
If, however, you can turn down the fuel a little, the HX35 in its various forms is a worthwhile upgrade and can be a nice upgrade without going to an HX40. It costs about $500 to add the HX40 mod to an HX35. It costs about $900 to replace the HY35 with a modified HX35. It probably costs about the same to buy an HX40.

 

[jaybo]

Continued:
My own truck is a 1999 4x4 long bed auto. My fuel mods are a set of DD stage 2s and an ECM reburn from TST pre ban. I have tried all the above HX35 arrangements on my truck as well. My fueling is not as aggressive as the 2001 above; I believe that a 3 setting on the above truck closely simulates my non-adjustable fueling. I now use an HX40 compressor with an HX35 stock turbine. I don't like smoke and tow 10,000. Although I liked the machined HX35 turbine wheel with its reduced EGT and increased power when empty, I found it difficult to use towing because of bucking. This bucking would occur upon deceleration (easing off throttle) when ascending mild grades at 50-65 mph in overdrive (3. 53 gears) at anywhere from 1500 to 2000 rpm. It was because the throttle was to 'hairy. ' Only the slightest throttle movement would cause the boost to jump from 0 to 32psi. Downshifting (getting the rpm above 2000) eliminated the problem.

My truck dyno'd at 320hp 710lb-ft with the HX35 compressor and 16cm housing. I estimate the HX40 compressor (which provided another 3 to 4 pounds of boost) added about 20 hp. It has reduced EGT's about 50 degrees. I use a 3" stock exhaust with a pacbrake. I estimate the machined turbine wheel added another 20 hp through reduced backpressure (still 3 to 4 pounds more boost as above). The machined turbine resulted in another 50 degree EGT reduction and quicker spin-up. As I said above, I DO NOT use the machined turbine wheel. My EGT's never exceed 1200 degrees even towing 10,000 up a 5% grade at 60 mph in overdrive.
HOWEVER, those of you with manual transmissions who never lug your engines, or tow lighter loads, or like to hot rod, or can control your fueling, may find the machined turbine to your liking. The folks at Majestic Turbo 1800-231-5566 are very friendly, very fast, and know their stuff.

 

[Steve Campbell]

jaybo, when you say the housing was machined to relieve backpressure, do you mean like a porting and polishing job or something else?

 

[jaybo]

The turbine wheel is machined by grinding off more material from each curved vane edge, making the curved cutout slightly larger on each turbine vane. It appears that the radius is enlarged slightly. This reduces backpressure and the weight reduction allows quicker spin up.
The HX40 compressor side mod uses an HX40 compressor wheel in an HX35 compressor housing. The compressor housing interior is machined to accomodate the 1/4 inch increased diameter of the HX40 wheel. It is then polished. The wheel assembly is balanced.
The finished product 'whooshes' instead of 'whines' i. e. it runs quieter. Majestic guaranties their stuff for 90 days.

I do not get any money for this endorsement.

 

[BRoth]

Hx35 with a waistgated 14cm turbine housing for any one?

We know there is a need for a high flowing fast reacting turbo for the 2001 Auto's that are pumping out some power and need to keep the turbo drive pressure down. This turbo needs no modification.

Brian@bd-power

 

[zman]

Brian -

I might be interested. I sent you an email. Thanks.

Steve