Engine Blueprinting Math - Maximum Boost - 56k Beware

[kmfdmk]

I have been reading and performing the calculations as listed in Corky Bell's Maximum Boost.

I thought some of you might enjoy following along with me as I perform the necessary calculations to Borg-ify my MKII Supra and hit the 200mph mark (someday). Or if you're just curious about WTF is going on inside your engine, or curious about engine efficiency and other curious facts.

I will post the pictures of my calculations so that you too can understand what actually happens on the inside. I will eventually follow up and edit this post so that it contains all the complete calculations (and the post below this one will have them as I go along).

I will ALSO post up AMAZINGLY AWESOME gumdrops of info-tainment wisdom. (Ok, so it's really hard facts as put out by Corky, I just happen to find them AMAZINGLY insightful AND entertaining.)

Let the madness begin.

**Some of these calculations are using MY VARIABLES... like 18psi (as a working pressure) etc etc. You CAN use your own... figure it out or GTFO.

Also you'll see stock figures in the center-ish, and my upped-redline numbers off to the left...(margins)

CLICK PICTURES FOR HUGE VERSION



Pressure Ratio, Flow Rates/Airflow


Flow Rate by RPM chart I made up (NA Airflow is the tiny number above).
*This Chart WILL CHANGE depending on your turbocharger's compressor map, and the slew of no less than FOUR variables. That is why the Middle Section is INCOMPLETE (right now) I need to consult the Borg-Warner compressor maps... (compressor & turbine housing AR's, compressor and turbine wheel AR's, Spool Valve, Timing, AFR, Fuel, Temperature, Exhaust size etc etc.)


S472 Compressor Flow Map.... needed to figure out if it will fit my needs.

I have learned this. Figure out your Application/NEED (where you want power), Do the Math, then pick the Turbo. Sounds straightforward, because it is. So... this S472 May NOT be the right one for me... it's for example... and what I'm comparing against for now.



Turbo Flow Rate Calculations... and the beginnings of calculating the volume of a radius'd cylinder... (Can Anyone Help with this shit? like calculating the volume of a cylinder (u-bend) given a certain radius?)


blueprint, calculate, boost, maximum, engine, math, formula, pressure

[StanS]

Vcyl = 3.14 X Radius squared X height

[kmfdmk]

I guess I should have specified I was looking for the volume of (a section of) a torus. Found the formula late last night.

[sickntwstdtoy]

Rusty you make my frickin head hurt..... I believe you are a mathmatically intellegent clone of myself

[9Teen86]

Interesting reading Rusty. The first information that I have seen to trigger an interest in understanding turbo design. Seeing the equations puts it in a form I can understand. Will follow the thread with interest.

[ra24man]

Rusty you make my frickin head hurt.....

Me too...math...not one of my strong points.

Great write-up Rusty...I'll be watching with great curiosity.

[kmfdmk]

A properly enclosed & ducted radiator/intercooler will see about a 20% increase in efficiency over a non-enclosed unit.

Air inlet to a properly enclosed and ducted radiator/intercooler only needs to be 25% of the total frontal surface area of the radiator/intercooler. This is true because only about 25% of the airflow would actually go through an open air radiator/intercooler.

Ceramic coated exhaust components will provide up to 50% more thermal heat rejection/containment.

[sickntwstdtoy]

yea what he said
wheres my aero testing pics???lol

[kmfdmk]

Air-to-water intercooling is 14 times more efficient than air-to-air. That's 1400% more....

[kmfdmk]

The first half of a radiator/IC does 3/4ths of the work. The last half of a radiator/IC only does 25% of the work.

It is always preferred to add more cores to a radiator/IC (provide more short paths) than to make the cores longer (which results in more unwanted resistance, back pressure, and pressure drop across the radiator/IC. More cores=better Longer cores=worse.

An IC that is thinner will outperform an IC that is thicker, but has the same internal volume. More frontal surface area=better

Copper transfers heat faster/more efficiently than aluminum. So a slightly smaller yet slightly heavier copper radiator could outperform a larger lighter aluminum one. Additionally a CRAZY copper IC will outperform an Aluminum one of the same size.

I need to compare the gains on air-to-air, and air-to-water of aluminum and copper to find the cost-benefit analysis.