pyrometer

[dezzi]

Hi i just got my truck going from a ground up rebuild. I fitted a pyrometer and when I was towing up a hill the temp went up to 1250 f before i backed off and if I let it, it would go passed it and once had it to 1400 f the probe is in between the last two ports on the left hand side and on cruise it sat on 1000 f and at idle 350 f. the mods are h2e turbo stage 2 injectors 6.0lt intercooler but not running a chip at the moment as the motor is new. could it be the gauge or is just running hot. Des

[pjwoolw]

Hows your boost? If your getting low boost and high EGTs I would suspect a leak in the intake / IC. Idle temp is OK. 1250 is about the limit sustained (for me). I'm guessing you pyro probe is in the exhaust manifold. My WAG.

[dezzi]

Yes the probe is in the exhaust manifold. The boost will get to 30 psi when i pushed it up a hill, cruising up a hill 15 psi and 1250 f.
Thanks Des

[Tyler]

How much are you towing, and what grade? Sounds normal if its a good load... and 1250 can be run all day long.

[dezzi]

I'm towing 5,500 pounds and don't know the grade of the hill but i can get 1250 on flat ground went overtaking.

[chvyrkr]

Stage 2's are typically 160CC injectors with 100% nozzles.

96 PSD's came with 90CC injectors.

So, you have almost twice as much fuel, and it's injecting twice as fast.

And since you're runnin without a chip, when the PCM asks for a certain amount of Pulse Width, it's gettin more than it wants for that RPM, level of boost, etc.

I.E. 2.5 seconds of PW with a 90CC stick is XX amount of fuel.

I.E. 2.5 seconds of PW with a 160/100% is XXX amount of fuel.

Make sense? Once you get some quality tunes I expect you'll run cooler