SOI Advice

[Marajin]

My take on boost and cold environments.,

You have someone who has set their truck to push boost to 39-40 psi when it is 70 degrees outside. They get into -30 degree weather, and the intake air is now very cold too because they didn't cover the front of their truck up to prevent this.

The air is a lot more dense, and this is the exact same effect as adding boost.

Now, 40 psi on the gauge is more like 42-43 psi. You start to get problems just like when you have too much boost. Not so good for engine.

The solution? --

You can make 700hp with 35-36 lbs of boost on 871 isx. I have seen this plenty of times. - Lower the overall boost levels for the engine all around. Bigger hp engines usually have bigger turbo, piping, and cac. They have more flow and do not need as much boost to make hp.

then when you get into cold weather and more dense air? -- you are still within spec.

->
by the way you are right in the same scenario if you have altered mcf tables to get boost to go up to 39-40.
->

You want the best of both?--- Lower boost a little bit and keep your foot out of it in the extreme cold and cover your radiator a bit so the air is not so cold going in. Having really cold air going into an engine that is working hard can have bad consequences all on its own. I have heard of pistons cracking in cars and truck both because of sudden inrush of extreme cold air when a high engine load was suddenly released by a clutch or tranny that let go all at once.