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  1. 73m819

    More Power From NHC 250 in M939 Series Trucks With Allison Transmissions

    the -10 does not lie, 2100 or there abouts is the governed rpm, the 855 is very over rev sensitive, valves float, hit pistons
  2. 73m819

    More Power From NHC 250 in M939 Series Trucks With Allison Transmissions

    Well I install the 22 button (stock is 27) have not been on the road yet, waiting to install the pyro., will let all know the results on the raising fuel by the lowering the button number
  3. 73m819

    More Power From NHC 250 in M939 Series Trucks With Allison Transmissions

    Watch that 2350 rpm, 855s DO NOT like over speed very well, also our 250s have NO PISTON OIL SQUIRTERS to help cool the piston and helping to lube it. the 290s do. your building a 290/300 but it still will be a 250 with a turbo, the difference is the 290 is built as a 290 which includes the...
  4. 73m819

    More Power From NHC 250 in M939 Series Trucks With Allison Transmissions

    I was under the impression that 5 and 6 were the hottest, because of the lack of air flow and being the furthest from the W/P, but I was told I was wrong and that 3 and 4 are the hottest, because these two have the least surface area to dump the heat. SO that is why I am putting the prob where...
  5. 73m819

    More Power From NHC 250 in M939 Series Trucks With Allison Transmissions

    I am going to install the pyro prob in the center section, right at the point where the two ends merge to the center, a couple of inches up from the pipe bolt flange. I will try to GET my wife to take some pics when I do the install.
  6. 73m819

    More Power From NHC 250 in M939 Series Trucks With Allison Transmissions

    I an dropping the button from 27 to 22, (waiting on button) I will install a PYRO, just to be safe, also plan to run the top end, no point in screwing with the IP if the top end is out of spec.
  7. 73m819

    More Power From NHC 250 in M939 Series Trucks With Allison Transmissions

    What is the STOCK button number in the ip ???, How much is gained going down each number ?????, which is better, changing buttons or tuning up the fuel at the throttle control ?????
  8. 73m819

    More Power From NHC 250 in M939 Series Trucks With Allison Transmissions

    I find my 36,000 lb, m819 has plenty of power, the trans sucks (3rd to 4th hole), will run 60+ all day, do not see where more power is needed unless 70 mph is wanted which the 900s are not designed for., military trucks are not designed for interstate speed.
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