ShinerBock wrote:
4x4ord wrote:
ShinerBock wrote:
2001400ex wrote:
That's why on my old 08, for example, I had a 120 HP tune. But on hot days pulling heavy, I had to back off myself part way up the hill. I would have blown it up if I didn't. But early in the hill and unloaded for a burst, I had every bit of that 120 HP.
Exactly, there is a huge difference between short burst power and sustained power. There is no way I can sustain my 500+rwhp tune while towing with my stock turbo. Heck, I can't even sustain that power level with my current S364.5/80/.91 turbo which outflows the stock by quite a bit.
An intercooler uses water to cool the charge air. That part of the system is far more efficient so can be small. However the intercooler requires its water to be cooled by a heat exchanger (radiater) This part of the Ford intercooler system is not small and it sits in front of the very large engine radiator. (At least that is where it was mounted on my previous Super Dutys.
While efficient in short burst scenarios, they are not efficient at long periods of load. Once a water cooled intercooler gets heat soaked, it takes a long time for it to cool back down. The opposite is true for an air cooled intercooler.
Also, if you account both stages of heat exchange (not just the intercooler), it is not that efficient. As with most things, every time there is exchange of energy(heat), there is a loss in efficiency.
When you're trying to loose heat that loss in efficiency is working in you're favour.
Edit: When the intercooler system has its own radiator, getting "heat soaked" is not going to be the same as in the case where the intercooler ties into the main engine cooling system.
It seems we are all discussing something here that none of us really have much of a clue about. One thing for sure is that these diesel trucks are highly engineered and it makes zero sense to put all this development and technology into a truck and then say "forget the cooling system" "as long as we can put out power in the middle of winter that's all that matters..... the rest of the year we can just defuel."