Hx40

[GeneralMachine]

Im searching around for turbo's, prices, and info, I found a avenue for a brand new holset hx40 for 600. 00, But am woundering on a 1100. 00 PDR turbo, what might be the difference in the spool of the two, maybe if Piers had there's set up to spool faster or if the new holset would work just fine, any input would be appreciated. TIA Harv

 

[dpuckett]

Harv,



I am no expert on HX40s, but I would go with the PDR version. True, the new Holset may work fine, but I remember reading somewhere that it was originally designed for 20-25 psi, not the closer-to-50 you'd make with it. The earlier ones that were off-the-shelf had a tendency to break the shaft if you let off the throttle at high boost. Several companies have addressed this problem and I think solved that and a few other issues for the most part. An extra $400-500 my seem like a lot, but chances are you wont break the PDR unit. You also have to be sure to get the right assembly number if going through Holset. Seems like I remember reading that somewhere a few years ago, when the HX40 was THE major upgrade; some were experimenting with the H2E, though.



Those who know more than I, feel free to correct me.



Daniel

 

[csevers]

It may not be just about fast spooling

PDR also modify's the bearings for better life expectancy. I like mine, it kicks the hell out of the stock 35 in my opinion but it may not be the hottest ticket any more, maybe it never was but it works and was in my price range at the time.



Craig

 

[krs]

Someone mentioned that Piers will do his modifications to your turbo. If true, it may be cheaper to buy the one you've found and have it gone through at PDR.



Worth a call, and let us know.

 

[DRAG DIESEL]

Stay away from the HX-40's if you can help it... its a great turbo for the under 350hp crowd... I am on #2 in 2 weeks! The 7mm shaft is way to small for most performance aplications... these turbos were only designed to run in the area of about 27psi...



there are only two types of hx-40's the ones that have failed and the ones that will fail...



My PDR HX-40 had no modified internals what so ever...

 

[overfueled]

HX-40?????

Drag Diesel, I don't believe I would tell HWhite to stay away from the HX-40. PDR has a very good product, allot of research.



The Holset HX-40 stock would be another question.



It could be VERY GOOD for him at this time. Better than HY-35 or HX-35.



With his power level in mind, I would ask him, what are you trying to achieve? In HP 350, 450, 550, 650 or higher ??? And then shoot for that level, with the advise.



If you look at his sig you could see that he is in no way near the over 350HP mark.



Also I believe in talking to Piers it was told to me that the HX-40 was good to about 600HP.



I make 570 HP with mine 40-42 Lbs Boost BD StageV's.



I like it better than the HX-35 with DD-II's.



Don't like all the smoke. Pro's-Con's



Just a little constructive info. OverFueled

 

[Diesel Freak]

HWhite:



At your current power level, I do not think you need a HX40. A PDR35 would be a better choice.



A PDR40 spools at about 1650 RPM with DD3's and a timing box. An OEM HX40 from Holset spools at about 1750-1800 RPM on a similarly fueled truck.



My PDR40 sees 29-30 PSI daily, and once the box is turned on, 36-38 PSI is the norm.

 

[jrandol]

Hwhite, why would you be interested in a HX40? Are you having EGT problems with your 35?

 

[LSMITH]

Originally posted by DRAG DIESEL



My PDR HX-40 had no modified internals what so ever...

Whoa camper... ... ... That is a pretty broad statement. How do you know it was not modified and can you qualify that it was not modified?







There are 2 HX40s on the market that seem to live, the PDR and the DD. The above is the first PDR HX40 that I have heard of blowing, and I have yet to hear of a DD HX40 blowing. They seem to be a timebomb in any other configuration.

 

[KatDiesel]

Originally posted by LSMITH

The above is the first PDR HX40 that I have heard of blowing,

Theres been some, how many, I don't know. I do know of three that have popped.

 

[GeneralMachine]

Thanks guy's for the responces, that's kinda what i was thinking, and yes the exast temp is a little hotter than i want it to run, im really happy with the performance at this point for i use this truck to pull the fiver, on a long hard pull the exast temp will creep up to 1000 and with my probe post in know im getting in trouble there, so with that said i felt that 4" all the way from the turbo to the end would get rid of the extra heat and put it all in sink, there telling me that the HX is 3" at the turbo and the only out is the HX40. Thank's again Harv

 

[DRAG DIESEL]

Originally posted by LSMITH

Whoa camper... ... ... That is a pretty broad statement. How do you know it was not modified and can you qualify that it was not modified?

When the Holset rebuild kit parts are identical to the parts that came out of the turbo from PDR, I would say that would qualify and non-modified.

The above is the first PDR HX40 that I have heard of blowing, and I have yet to hear of a DD HX40 blowing.

No offence... but what rock are you living under? Just cause you don't read it on the TDR doesn't mean it didn't happen... not everyone posts everything. The guy that does my turbos, Pius Eberle of Bell Turbo doesn't have one WORKING HX-40 in the whole shop, they are all blown up. (this is not a rip on Piers coming up) For someone to think that a guy can change the durability of that turbo is crazy! An HX-40 is an HX-40 no matter who makes it or tweaks with it... . get over it.

 

[Diesel Freak]

Originally posted by HWhite

Im really happy with the performance at this point for i use this truck to pull the fiver, on a long hard pull the exast temp will creep up to 1000 and with my probe post in know im getting in trouble there.

With your fueling, a PDR40 will raise off boost and transient EGT since it will be making less boost than the stock turbo at your current fueling level. It may also raise peak boost EGT's since peak boost will be lower than the stock turbo



I would recomend a PDR35 with a 14CM wastgated housing on it.



oh, and if you are hitting 1000F post turbo, SLOW DOWN AND GRAB A LOWER GEAR!

 

[KLockliear]

For your power level (if you're not going any farther), I too would recommend a Hybrid 40/35. They work well in the 300-400rwhp range. A 40 at your power level would be a bit doggy on the bottom and would make for more EGT at cruise, especially with your trailer.



There are several issues with HX-40 turbos. First, there are 20 different Holset part numbers for an "HX-40". Make sure you get the right one. Which one is it? No one that knows is gonna tell you... takes too much R&D (read money blowing them up) to find out. There are things that can (and are) done to make the best part number even better... and those are the ones you want.

 

[GeneralMachine]

Turbos

Thank's again for the reply's Im gona go with the hx35 & 4" exast Ill post the out come. This should fix it up until the trany has to be updated. Harv

 

[Extreme1]

HWhite has already made up his mind but I gotta add my experience on this one.



1) I bought a reman HW-40 cheap from a place that had one after buying out a diesel repair shop going out of business. I talked to Al at PDR and he gave me the OK on the Holset part number.



2) I had it shipped to PDR to get their mods done: balanced closer to perfect than Holset limits, machined down compressor housing for quicker spool, wastegate set to 40 psi.



3) A 40 can be blown if it is exposed to a lot of rapid delerations when running a lot of boost. Automatics only do this if you take your foot off the throttle when making a lot of boost. Manuals? I'm guessing that if you are really accellerating quickly with a stick, you'd be doing it between most shifts.



My experiences and opinions - no guarantees. Call PDR, they will answer questions.

 

[TomGolden]

Originally posted by DRAG DIESEL

Stay away from the HX-40's if you can help it... its a great turbo for the under 350hp crowd...

Great... thanks Jake



I got my HX40 from Diesel Dynamics and went to their shop in Vegas to have them do the install. That was in June 2001. This was way before any of today's modified HX40's were out, this was back at the time when the HX40 was the BIG thing in turbo upgrades for us, and the really hot ticket was to send one to Majestic Turbo for them to lighten up the shaft, etc. for faster spooling and whatever. Many of those modified turbos came apart on a frequent basis, so I wanted a bone stock HX40, which is what the good folks at DD said mine was. I didn't know they were now selling modified HX40's.



I have put at least 45K miles on my turbo, almost all of them with the mods I currently have, except for awhile I had the DD True Torque Power Module (an Edge EZ) before upgrading to the drag Comp. Now I don't drag race much, and I rarely ever crank the Comp up past 2x3, and so on a daily basis I almost never push past 25 PSI, which is possibly why mine still works just fine.



Now that the prices of twin configurations are becoming more reasonable... ... . Oo. Oo. Oo.



Tom

 

[Briar Hopper]

90,000 of my 118, 000 miles have been with an Hx40, the first one was a Majestic tweaked model that made it 3 miles down the road and came apart at less than 20 psi.

The one that went on the next day was a stock Hx40, a spare that Mark Chapple had on hand. It lasted until I removed & sold it, to install a faster-spooling Hx40 from Piers. That one has been run at 500 HP fueling levels on my 24 valve for 52,000 trouble-free miles.

I've seen high HP 12 valve engines pop quite a few turbos, some due to over-speeding or abuse. At least more often than I've seen it happen on the 24 valve engines.

Would I buy one again ? Yes, if it was from Piers. I know what mods he puts into them, it's why I traded up from stock.

 

[drawson]

I have had my Piers Super HX-40 for 56K and have not had one problem. It is truely a great turbo!!!

 

[Joseph Donnelly]

Precision balancing is what the 40 needs most. About 1 out of 3 is poorly balanced, the second is fair, and the 3rd is OK from Holset. I like the balance and check out that Pius of Bell Turbo does for me, and have had excellent results with HX40s and other turbos from his shop. I'd say the 40 is appropriate up to about 450 hp. Between 450 and 500, it works but egt's will get high. Pius and others are working on turbos for those appplications; the H2E is one such. Some of the hybrids can get expensive. . .