• Steel Soldiers now has a few new forums, read more about it at: New Munitions Forums!

  • Microsoft MSN, Live, Hotmail, Outlook email users may not be receiving emails. We are working to resolve this issue. Please add support@steelsoldiers.com to your trusted contacts.

 

What turbo for nhc 250

my blood flows OD

New member
340
3
0
Location
strafford new hampshire
Im just curious what turbos guys are running on there nhc 250's?
and what donor trucks Your turbo came off.
Ihave a turbo off a 7.3 power stroke. Is this a good option? I have the skills required to make the crossover tube I just don't know enough about selecting the right size turbo.
 

red

Active member
1,988
22
38
Location
Eagle Mountain/Utah
Way too small of a turbo. For reference a Holset hx50 is considered a BIG turbo for the 7.3, it's too small for the nhc250. It's a 14 liter engine.

Holset HT3B is a common turbo from the other Cummins 855 engines. Hx60 can be made to work but it will spool up a bit late for the 250 in stock form.
 

simp5782

Feo, Fuerte y Formal
Supporting Vendor
12,088
9,247
113
Location
Mason, TN
Way too small of a turbo. For reference a Holset hx50 is considered a BIG turbo for the 7.3, it's too small for the nhc250. It's a 14 liter engine.

Holset HT3B is a common turbo from the other Cummins 855 engines. Hx60 can be made to work but it will spool up a bit late for the 250 in stock form.
These puppies are lonely. $1200 shipped. TT setup off a 6.4 powerstroke. 42lbs of boost. img-20120829-00049.jpg

Sent from my SM-G935P using Tapatalk
 

98G

Former SSG
Steel Soldiers Supporter
5,845
3,885
113
Location
AZ/KS/MO/OK/NM/NE, varies by the day...
So what is the best turbo to use and what trucks are they commonly found in?
Why reinvent the wheel? Have a look at what is used on the factory turbo equipped 855s and go from there...

I've got an M818 that the previous owner put a turbo on. I am EXTREMELY HAPPY with the performance. I'll have a look tomorrow and see just what it is.

(Shame on me for not knowing. Let me quote Barman "if you didn't build it, you can't call it yours!" )
 

Attachments

red

Active member
1,988
22
38
Location
Eagle Mountain/Utah
1970's-1990's heavy duty trucks. Peterbilt, KW, Freightliner, etc all had them. It's not like the light duty market where Ford/Chevy/Toyota etc all have just their engines.

Turbos that came on the 855 series Cummins engines are commonly the Holset HT3B, HT4B, HX60, and some other models from Garrett and wcuhillbilly is running a Schweizer turbo (check out his thread 'm816 jakes and turbo'). Supposedly the HX55 came on some of the lower power models but I haven't seen one. I am planning to test out the HX55 next year on my wrecker, see if it spools up low on the RPM range to help with the wide gearing gaps of the transmission.
 

simp5782

Feo, Fuerte y Formal
Supporting Vendor
12,088
9,247
113
Location
Mason, TN
All of them have tags on them. Brand, model number, and serial # unless it is missing then that's up to you.
 

98G

Former SSG
Steel Soldiers Supporter
5,845
3,885
113
Location
AZ/KS/MO/OK/NM/NE, varies by the day...
The thing abut putting a turbo on an NH250 is the lack of oil squirters. It seems to me that it's an invitation to a melted piston. The risk:benefit seems slanted in favor of risk.

A pyrometer is an absolute must. Knowing when to let off it is a must.

All that being said, OH-MY-GAWD it makes a difference. Even with the 16.00s on this truck it practically sprints up the hills at highway speed, and takes off from a stoplight as well as the redtruck, all while howling like a banshee... if you like a deuce with a whistler you'll really like this....
 

74M35A2

Well-known member
4,145
311
83
Location
Livonia, MI
You can also size it the other way around. Turbos are sized by air mass flow, which is a direct correlation to hp, so, they can be sized by target hp essentially. This can be plotted on a compressor map, to put the turbo at a specific efficiency area on the map. It is not as difficult as it sounds. If you are starting out with no turbo, this may be a better way to size accordingly to what you want.

Just another option to do this. Probably still easier to simply grab a turbo off an old 300hp 855 and be done with it. Or the entire engine itself for that matter, and if doing that, go for the old 400hp one!
 

l3oss

Member
Thanks for starting this thread. I to had the same questions. I read the thread thus far and went and explored a bit on google and came across this chart someone else had entered onto a diesel bombers turbo thread. Maybe it might be useful to someone here ....

Turbo---CFM----Racing HP-----Daily HP inducer
HX35----574------420----------330------ 56
TP38 767
HX40----763------560----------440------60
T66-----800-------560----------440-----66
GTP38R 897
B1------900-------630----------495
H2E-----868------700----------550
HX50----1000-----700-----------550-----63,67
HX55----1050------735----------578-----67
HT3B----1085------770----------605-----76
GT42----1302----------------------------75
T76-----1350------945----------743------76
HT60----1400------980----------770
B2,s400-1500------1050---------825-----75
GT47------------------------------------80
HX60----1550------1085---------853
TV81----1600----------------------------85
T88-----1750-------1225--------963-----88
HT4B----1800------1260---------990
Big Brother-1900----1330--------1045-----87
T91------2000------1400--------1100-----91
HC5A/HX82-2450----1715--------1348
T100------2600-----1820--------1430-----100
T105-----2900------2030--------1595------105
 
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website like our supporting vendors. Their ads help keep Steel Soldiers going. Please consider disabling your ad blockers for the site. Thanks!

I've Disabled AdBlock
No Thanks