Calculate your fuel and HP here
Thread Starter
Rotary Freak
Joined: Oct 2001
Posts: 1,515
Likes: 1
From: Atlanta, GA
Calculate your fuel and HP here
I programmed this in java the past couple of hours.
Take a look!! Note. You need java 1.4.2 installed. You can dl from my link though.
http://home.southernct.edu/~stoehre1.../FuelCalc.html
Next will be a turbo calculator which takes V/E into effect based on compressor maps. Ugh why am I doing this??
Take a look!! Note. You need java 1.4.2 installed. You can dl from my link though.
http://home.southernct.edu/~stoehre1.../FuelCalc.html
Next will be a turbo calculator which takes V/E into effect based on compressor maps. Ugh why am I doing this??
I live in an igloo
Joined: Jul 2004
Posts: 2,546
Likes: 0
From: calgary alberta
Your doing this for your own damn good! heh.. its good to play around with an area that your still learning about, you'll get more experience that way. I remember when I was working with visual basic 6, I used to make little programs that were totally useless to most people, but usefull to me, such as a formula input for math 10 class, etc. I just did it to figure it out.
I remember making friggen games with my TI-83 calculator, it was pretty good. The calculator came with a complete programming language manual, so I started to write my own progs, the most usefull ones were formula converters for math and science, etc. I remember starting a game that replicated what SIN was for the pc. I got the main menu working, along with a cool 'sin' title screen, it was fun. As for a character running around shooting, hell if I knew how to do that, but I was getting the basics down just practicing.
In other words, keep it up. If no one appreciates it, your wrong, you will.
I remember making friggen games with my TI-83 calculator, it was pretty good. The calculator came with a complete programming language manual, so I started to write my own progs, the most usefull ones were formula converters for math and science, etc. I remember starting a game that replicated what SIN was for the pc. I got the main menu working, along with a cool 'sin' title screen, it was fun. As for a character running around shooting, hell if I knew how to do that, but I was getting the basics down just practicing.
In other words, keep it up. If no one appreciates it, your wrong, you will.
Rotorhead
Joined: Feb 2001
Posts: 9,136
Likes: 39
From: Charlottesville, Virginia, USA
Just some observations:
1) Not all fuel injectors are rated at the same pressure. Are you going to use 43.5psi as the baseline to work with RC Engineering and Bosch injectors, and then just have the users convert the others (Nippon Denso, Python, etc.) to the 43.5psi equivalent when entering the "cc" value in the calculator?
2) I assume the fuel injector duty cycle is based on batch fire rather than SFI for a 4-stroke piston engine?
3) What is the purpose for the input for the number of cylinders if you already have BSFC? Aren't you going to need an input for displacement and rpm for VE to do anything for you? I am a little confused by this, but it could be because I am tired.
4) Are the fuel pump calculations assuming no pressure drop between the pump and the injectors?
5) In reference to your plans for adding turbocharging, I believe the VE of the engine block should remain constant regardless of changes in intake air pressure. I don't think a centrifugal compressor wheel makes a lot of difference in VE, but the turbine wheel will. It may be difficult to make a calculator that determines the aerodynamic drag of the compressor wheel, and how it affects VE at various airflow rates. The published compressor maps will not show you this. Garrett publishes turbine wheel maps, but I don't know if these will help you, either.
Pretty cool calculator. Are you planning on growing it into a mega-calculator that has all kinds of cool inputs and functions? It would be nice to have something like that offered for free on the internet so we proletarians can play around with numbers sometimes.
1) Not all fuel injectors are rated at the same pressure. Are you going to use 43.5psi as the baseline to work with RC Engineering and Bosch injectors, and then just have the users convert the others (Nippon Denso, Python, etc.) to the 43.5psi equivalent when entering the "cc" value in the calculator?
2) I assume the fuel injector duty cycle is based on batch fire rather than SFI for a 4-stroke piston engine?
3) What is the purpose for the input for the number of cylinders if you already have BSFC? Aren't you going to need an input for displacement and rpm for VE to do anything for you? I am a little confused by this, but it could be because I am tired.
4) Are the fuel pump calculations assuming no pressure drop between the pump and the injectors?
5) In reference to your plans for adding turbocharging, I believe the VE of the engine block should remain constant regardless of changes in intake air pressure. I don't think a centrifugal compressor wheel makes a lot of difference in VE, but the turbine wheel will. It may be difficult to make a calculator that determines the aerodynamic drag of the compressor wheel, and how it affects VE at various airflow rates. The published compressor maps will not show you this. Garrett publishes turbine wheel maps, but I don't know if these will help you, either.
Pretty cool calculator. Are you planning on growing it into a mega-calculator that has all kinds of cool inputs and functions? It would be nice to have something like that offered for free on the internet so we proletarians can play around with numbers sometimes.
Thread Starter
Rotary Freak
Joined: Oct 2001
Posts: 1,515
Likes: 1
From: Atlanta, GA
1. I set it up so that you can change the static fuel pressure in case injectors are rated for higher or lower pressures.
2. Im not sure about this one, but, the duty cycle is just a percentage of the total amount of injector fuel flow. Its an equasion I pulled off of RC Engineering's web site.
3. Right now Cylinders doesnt do anything, as well as V/E. The chart is currently only for fuel systems and nothing to do (yet) with engine internals and airflows. I feel people always underestimate fuel after doing 2-3 air upgrades anyways.
4. The equasions are a little screwed up in this section. The pressure doesnt change anything. Basically, its pretty accurate if you look at a 3rd party chart for Psi you are running, and L per hour the pump will flow. You have to do reasearch for this section, and again its ballpark.
Thanks man! I can basically set up anything in that program as long as I have the equasion. Im going to borrow my friends Maximum Boost book, cause I think that book had a ton of them.
2. Im not sure about this one, but, the duty cycle is just a percentage of the total amount of injector fuel flow. Its an equasion I pulled off of RC Engineering's web site.
3. Right now Cylinders doesnt do anything, as well as V/E. The chart is currently only for fuel systems and nothing to do (yet) with engine internals and airflows. I feel people always underestimate fuel after doing 2-3 air upgrades anyways.
4. The equasions are a little screwed up in this section. The pressure doesnt change anything. Basically, its pretty accurate if you look at a 3rd party chart for Psi you are running, and L per hour the pump will flow. You have to do reasearch for this section, and again its ballpark.
Thanks man! I can basically set up anything in that program as long as I have the equasion. Im going to borrow my friends Maximum Boost book, cause I think that book had a ton of them.
Last edited by SaabGuy; Jan 24, 2005 at 08:54 AM.
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