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M939A1 NHC Turbo
If you up the boost & relocate it in front of the radiator it will help. There it is likely heating the air from the engine/radiator heat.- Lonnie
- Post #36
- Forum: M939 series 5 ton truck modification & Hot-Rodding
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M939A1 NHC Turbo
The boost curve is pretty lazy & will not make much boost until the revs are up in the 1800 range, below that it falls off fast. 1100 is not bad for an exhaust temp, but I could not make any heat with the turbo before I increased the fuel... under 800 was it. The intercooler you have will be...- Lonnie
- Post #34
- Forum: M939 series 5 ton truck modification & Hot-Rodding
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M939A1 NHC Turbo
Sounds like the turbo is not spooling. You obviously have no exhaust restriction, but the inlet air is in question. I test drove mine with a K&N cone filter on the turbo & it worked OK before I got the factory canister piping built.- Lonnie
- Post #30
- Forum: M939 series 5 ton truck modification & Hot-Rodding
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M939A1 NHC Turbo
You said the temps go high... but never quantified that. What reading are you seeing? Also, mine would not make over 3-4psi boost with stock fueling. It is up to 12psi now with 200psi rail pressure & still only emits a light trail of smoke.- Lonnie
- Post #28
- Forum: M939 series 5 ton truck modification & Hot-Rodding