Piers New HX-40

[Cummins Corvette]

Kurt thanks for your reply. I shot you an e-mail with some more questions. Piers- you are the man and always will be. Thank you very much for the Christmas card! I saw the envelope and who the heck was sending me something from another country. I will be back up in your neck of the woods next year for sure. I very much enjoyed my trip up there in august. It looks like a tuff choice between these two turbos. The hx 40 has a tendency to blow up, but Kurt’s turbo is so friggin expensive. Well I am going to have a while to decide while I save up. Keep the reports coming.

 

[Forrest]

If you're using the mandrel bent downpipe, it comes dangerously close to the firewall blanket. Yep, it's fire time.



I never noticed until Jim Leonard pointed it out. Jim worked on a truck that caught on fire. My blanket is cut away with a couple inches of clearance.

 

[MY6EATSV8'S]

from my own personal experiance with my hybrid h2e your b1 sounds almost identicle to my experiance as far as boost and egt. The only difference I noticed was turbo outlet temp was 403 degrees at 42psi. I know that most maps are derived from heat of outlet temp at certain psi and rpm. All maps I am aware of end at 400 degrees meaning the B1 is at the top of its map at 42psi. .

The h2 does not go off its map until 48psi. . I hope soon Bpine can get up to test my h2 it seems like not soon enough because I'm always playing catchup.

 

[Diesel Freak]

it is about time turbo R&D caught up with fueling R&D.

 

[BPINE]

I will be testing the H2 soon but I hate to say it Adam I think I am going riding tomorrow. Next weekend I guess it is going to be bike riding and turbo testing for the both of us.

 

[HVAC]

Not A Map

First of all Adam, BPine's truck is no place to test a turbo!!!



Second, know that kurt is not sharing a compressor map with us, he is relaying the figures he captured on his truck under load at high elevation.



Also note that the output temp you mentioned was based on a intake air temp of 150* while the outside air temp was only 40*. He was using under the hood air to which is hotter to simulate a harsher outdoor atomosphere. Given normal intake air temps the map for the B1 would go much higher then 42 psi before reaching 400*.



Performance Diesel will be installing a B1 late next week or early the following week and I will provide any impressions and or technical feedback.

Stay tuned.

 

[Don M]

Looks like I wil need a new turbo, mine just blew up about an hour ago.

Going roughly 30 mph and floored it. Loud pop and lots of white smoke. Glad I was close to home. Man this thing blew oil out of the tailpipe like you wouldnt believe. Another HX-40 with the Kwikspool housing dies a terrible death.



Don~

 

[TxDieselKid]

Don has a hidden sig....

And to think don, your sig says that your truck is "hurting for more power".



Andrew

 

[drawson]

I finally had some dry road to test this new turbo out today. It will make 38 psi the way Piers has it set. (I think I'll leave it this way and maybe it will last)

I was able to run it too 3600 RPMs in 4th and the EGTs climb alot slower. When I lifted they where 1400 Deg. With the old turbo even ijn this winter wonder land I could max the EGTs(1600) before it hit 3000 RPMs and this was at 42 PSI.



It always blew smoke at anything over 3/4 throttle now it is just a haze. Time for more fuel I guess



Oh one last thing the truck is now Scary Fast and traction is a concern now.



I LUV this Turbo!!!!!!!

 

[drawson]

I dyno'd two days agoon a Mustang. It only made 24 HP higher than just before. The tires where slipping and after three runs where hot and sticky. The boost was also down 4psi from where it run on the road. this little of HP increase was a bumber



There was one thing that was great this turbo has alittle less HP down low (1250-1350 rpm range) but right at 1400 it take off like a rocket.



I need to find a Dynojet now

 

[Don M]

Dee,



If you only changed the turbo from the hx-35 to the hx-40 the HP increase is about right. Most guys get around 20 to 25 HP gain.



Now you can dump in more fuel.



Don~

 

[drawson]

Hills are fun

I had a great ride today over one of our local hills (Trapper loop for you locals). Right at about the top there is a straitaway hill (6 1/2-7% grade) about 1/2 mile long. I have alway like this to test what old "Eat'M'Up" can do.



Starting coming out of a corner at 55 in 5th and putting the hammer down with the old HX-35/16 I would get to about 80 and the EGTs stopped me from going any faster (1600+ ), tonight I was at 110 went common sense got the better of me. And it only got to 1400 Deg.



Before I would be making 42-44 pounds of boost and now the waste gate opens at 38. The EGTs climb much slower with this SUPER Turbo



This is all with out the Psychotty housing in place Just an open RE-0880 filter taking in the underhood heat. I have noticed with out this housing even cruising down the freeway empty my EGTs are 100-125 deg hotter.



This turbo sure has made my truck FUN!!!!

 

[Vaughn MacKenzie]

Drawson, you're just eating it up aren't you



I have to ask though, how does it spool up off the line compared to the stocker? I wouldn't expect it to be as fast but if it's close I could really live with Piers' HX40.



I have been interested in the B1 but think it is too big for what I run and the amount of fueling I have. I was really intersted in Piers HX35 but I dynoed at 323 with just DD2s and a box puts me past 350 easily. Add a Edge Comp and well, I think I need an HX40 for sure. Decent spoolup is what I am looking for though.



Vaughn

 

[drawson]

Vaughn, This turbo spools up just slightly slower than the old turbo. Here is a test that I before and after, no adjustments to the AFC or plate positions. 4th gear doing 33 MPH(1200 RPMs) throttle it and watch where boost starts. With the old HX-35/16 I was getting boost at 1350 RPMs with this Super turbo 1400 RPMs and after the boost comes on it build alot faster. 2psi to 20 psi even at a part throttle is twice as fast.

 

[Don M]

Once I get the truck runnig again (hopefully this week) I will have a little input on the Piers HX-40 as well.

I will be able to compare it to and HX-35/12 and HX-35/16 and a HX-40/12 hybrid. We all know the deal with the HX-40/12 hybrid.



Im pretty excited to get it going.



Don~

 

[Diesel Freak]

The only question I have is. How long till the turbo shaft takes a crap?

 

[John]

Vaughn, Bill Kondolay really likes the PDR HX35 Super Turbo for horsepower applications exceeding 350 BHP. I remember him telling Piers that it works extremely well, to well above 375 BHP. At the horsepower level you are at you may find you are better served with the PDR HX35 Super Turbo as opposed to the PDR HX40 Super Turbo. Big Bob also discovered the same thing... he really likes the reduced turbo lag the PDR HX35 gives him over some of the HX40 variants he had tried.



... just a thought

 

[drawson]

Diesel Freak, There are alot of HX-40 that have run for a good long time w/o any problems and with Piers fixing this one up I am confident that it is going to last as long as I don't go crazy adjusting the waste gate up to very high boost numbers. This turbo is working alot easier than my old HX-35 was running up to 45 PSI.

 

[Don M]

Diesel Freak,



For me it will prolly take about 2 weeks. That is my average explosion time from install to calling around for a new one.



Diesel Dynamics has never had a HX-40 smoke in the stock form yet. The Piers HX-40 does not run a smaller housing like the hybrids do. He is modifying the turbine housing to help low end spooling some. Dee has had good results with his and says it nearly spools as fast as his HX-35/16 did. For me, I can live with that to gain some up top. The HX-40 turbos that keep grenading are either modified to use the smaller housing or they were worked on by Majestic.



Don~

 

[Diesel Freak]

Originally posted by drawson

with Piers fixing this one up I am confident that it is going to last

Did he do anything to strengthen the shaft?