All of this talk about DJ's 16v 2.4 and my 2.2 8v being around the same power level got me thinking about the thread where me and JT were swapping views on exhaust resriction and I was trying to explain myself using "conservation of energy" and Nobody was getting it.
Now, since conservation of energy is such a common term, I had to come to the conclusion that I just wasn't explaining it right?
Anyway, it just occured to me that this is a perfect platform to explain what I ment. (long as DJ doesn't mind)
The fact that DJ is running a 2.4 16v and I'm running a 2.2 8v has ZERO to do with anything when it comes to making power. Only 1 thing matters, cylinder preasure. Which after the work is done will = exhaust drive preasure.
The Fact that both DJ and myself are running the exact same turbo AND both running 4" dumps makes this a Great topic to be able to relate to.
DJ made the statement that at 24 psi he would expect his drive preasure ratio to be Higher than mine because we know it's a restrictive turbine wheel and housing. (and I agree with this)
Now here's what I was trying to explain in the other thread; IF we are both making the same power, let's say 500WHP the exhaust energy will be the same! Plain and simple. If DJ had the same exhaust manifold then it would be even more simple, because it would all be apples to apples and I could tell you by drive preasure Alone who's making more power!
Let's say the Charger has 37psi drive preasure @ 34 psi manifold preasure @ 500WHP. Let's also say that DJ IS making the same 500WHP @ 24psi. I would expect his drive preasure to be the Same 37 psi I'm seeing IF his exhaust mani was the same, Get it? The exhaust energy is the Same wether it's coming from a 16v @ 24psi or an 8v at 50psi and you should be able to see this IF the hot sides are the same.
Now, let's take this one step further. DJ is running a nice 4 into 1 header, should be more efficient than my ported stocker, right? Well there's an easy way to see how efficient it actually is. IF we Are at the same power level, than any amount Less drive preasure = more efficient exhaust through the turbine wheel.
So let's say that DJ takes a reading and it's 32 psi drive preasure @ 24 psi boost. IF the two mtrs are making the same power, thus the same exhaust energy, the 5 psi Less drive preasure shows the efficiency of the header.
Make sense?