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NHC 250 5 Ton performance

DaveP do you have a pic of your truck/trailer combo setup attached? Be interesting to see
as requested-------problem child and her wagon

not a big load but a load none the less
 

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70deuce

Active member
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121
43
Location
Franktown, CO
At 8000' these motors are probably down to half their rated power. These huge non-turboed motors lose massive amounts of power at high altitude.
 

OPCOM

Moderator
Steel Soldiers Supporter
3,657
27
48
Location
Dallas, Texas
oops I posted same time as the Chief.

Is there a general chart for power % versus altitude for naturally aspirated diesel engines? It is interesting to compare, if there is data.

The only one I have is this cheezy one, made from generator set ratings and one gasoline engine rating.
 

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trooper632

Member
533
3
18
Location
Utopia, TX
I pulled a trailer loaded with round hay bales probibly around 35 or 40,000 lbs and had to drop into 3rd several times on small hills, but I hear its normal, averaged around 45 mph, a little fusterating but I got where i was going .
 

Bill in pa

Member
Steel Soldiers Supporter
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Location
homer city pa
Hi I have a 71 Bobbed m813a1 with 52" runs good but looking to help it up hills
You say u turbod it for 400$...... what was it you put it in.... im needing something to help on the hills.
any and all help appreciated
 

jarhead1086

Member
112
2
16
Location
Farr West, UT
Thanks for all the helpful input here Gentlemen. I experience the lug here in Utah climbing steep hills at 7000+ elevation. It ran much better in Barstow during my recovery with my brakes dragging. I thought something was going wrong and kept checking things. I bought a brand new turbo from an SS member, but will expect to blow much more than $1000 to get everything including the 5" exhaust I have been advised to get with it. This 923A0 converted A1 gets me down the road much better than the old M35A2, but the gearing and the NA do make it a dog on the hills. I will try the 5th low advice next outing. Anxious to see the effects on the EGT's and the performance at altitude with the turbo. Not expecting a lot, just want to help the old girl breathe the thin air better. I already enjoy this truck as is.
 
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