Well now we might be getting somewhere.

My 14.0 @ 97 mph while run in less than optimal DA conditions would correct out to a 12.9 @ 104 mph at Sea Level and the "corrected" HP number would be closer to 400 hp. (Like at ATCO or Cecil in the fall, compared with SIR in Tucson on a hot day)

Now I add my intercooled, less than ambient temp 15 psi of boost - which both compensates for the DA conditions and adds the "atmosphere". How much does the lower than ambient charge air add - according to the "math"? Is it 150%? More? Less?

If I take my intercooled boost generated 582 HP number and divide it by the "corrected" 400 HP number - I end up with a 145% gain. Does that work with the "real" math?

I suspect that the difference in VE between the mild NA engine and the forced induction engine would probably make up that difference in the math between the DA corrections and the increase in efficiency. (It fills the cylinders whether the intake manifold and TB were optimal or not)

I don't have any idea whether this is actually "correct" but this hypothesis lets the timeslip results match up a whole lot closer with the math! What does everybody else think?

Duner!!

You got me all corn-fuzed??

was the 582hp actually what you saw on the dyno or was that a corrected HP?

If it was your actual HP reading from the Dyno then you also need to correct it as well or give us the N/A HP uncorrected.

I personally try to stay away from the Corrected Numbers. I know why people do it, to have an even baseline to compare. BUT I also know that you are at a Higher altitude and understand you will be down a bit on power.

Based strictly off boost generated with a turbo, more power based off more boost is purely efficiency.....sure a motor may mnake 500hp na, then only say 800 at 15psi....to me most of this loss of power comes from the turbine choke that comes from the turbine wheel that is to small....now go and put a turbo on there that can generate closer or less than 1 to 1 boost/backpreessure ratio then power will increse greatly, but the turbo will be laggier, what most people don't want.

With a large enough turbo a 500hp na motor can make 1000 hp at 15psi no problem.

OK finally went and pulled the book of the shelf. "Dyno Testing and Tuning"

After what I read in there about the SAE and there 3 different HP-correction formulas. "Which have a fudge factor of 5-11%". It all comes down to when, where and who was doing the dyno-runs and whether they used one of the SAE standards of the time or made up their own.

The SAE HP correction Factors have changed no less than 5-6 times in the last 20-30yrs. You can also put you own correction factors into any Dyno Software. They even warn that if a Dyno sheet is a few years old it may be off from todays SAE Standards.

To give you an example we in aviation use a Sea level Standard reading of 29.92hg @ Sea Level on a Standard Day of 70*F and 70* Humidity.

SAE on the other hand has 3 variations of that.
1= 29.23hg @77*F and Dry Air
2= 29.92hg @60*f and Dry Air
3= Is metric not even gonna go there!!

They did mention that "Even though no one they know of does it" that when Dynoing with boost you should be figuring in Absolute Pressure and not just Gauge Pressure. They said by not doing this your Boost Dyno Numbers will be on the low side. How Low????

Theory!! Too many numbers and uncontrollable and unknown variable to worry with!!!

LAW!!! ET's never lie!!

Hey guys, Einstein said something like this:
"Somethings important can't be counted, and somethings counted aren't important", for what its worth.

Your avation ISA, instrument standard atomsphere, is different than what I was taght several years back, ISA was 29.92 at mean sea level at 59F and no mention of humidity The one you posted sounds more like the SAE for automobile use except the humidity

I have never seen a topic make so many turns.

i would have liked to do a head swap and show the difference in boost and HP but time is wasting so the 70cfm gain in port will not be a direct comparison.

yes the drop in pressure will help the heat made trying to force the air thru the port.i have bigger carbs also for room to grow.boost is fun.

What about the bigger blower,spin it slower theory??