Maths

[Greg E]

Look...


Doesn't matter how intelligent of math you throw at the equation. You can predict the future to your hearts desire.

There are always X factors that you never in your wildest dreams occur. There's physics and there is relaity. There is what you predict will happen and what actually happens.

It doesn't matter how educated of a plan or guess you make. What actually happens can (and usually does) happens is different than what you expected. These variances are called the x-factors.

Unless you have a MAF or some kind of sensor to determine and compensate for these x- factors, reality is gonna slap you in the face.

Take a step back. Evaluate your math and physics from an out side point of view. Unless you can compensate for these things that you aren't aware of, reality is gonna hit you hard. Worst case scenario is it doesn't work. And it won't.

The biggest problem with speed density is you tell the ECU what AFR it should be seeing and any x-factor you didn't calculate isn't compensated for becomes a reality. Change your boost, change your VE, change your turbo... All these things throw your educated guess into chaos.

All your math is only as good as your results. Show me something that can compensate for the factors you wouldn't imagine and you got something going for you. This system already exists. Its called the stock MAF and closed loop.

[futurevr4man]

And as a result of not reading, you miss the intention and question :-P

you asked a question in the post that i initially quoted. i answered it.

past that, you arent going to get a really accurate assumption due to some simple equation which is why i didnt say anything about your math. i could sit down, go through the otto cycle with you, integrate, find the area under the curve (horsepower), do some other equations, factor in humidity, frictional losses, etc AND STILL i wouldnt come up with the correct answer for fuel consumption or anything else you wanna find. i could probably get reasonably close (probably), but there is a lot more to it than the math you have put up. it would take a long time to not only type out more, but then when the inevitable questions come in of how did i get that, or arrive to that conclusion etc, i have better things to do with my time.

not trying to be a wiener, just sayin that you have only skimmed the surface. things get real tricky real quick