J-Rod

Yes, but I'll have to see if I can find it somewhere I don't have it handy.

DanO

I'll post up the Thermodynamic formulas for each process later

ty_ty13

iTrader: (42)

this is your same equation only different order for your CI

R=bore/2
P=3.14.....
H=stroke

(PR^2) H8

ie

3.14(2^2) (4(8))=401.92


basically where people get the bore x bore x bore x stroke is the rounding off of Pi.

Pi= as mentioned ( rounded to 2 decimals, Pi is a never ending number by the way)= 3.14.

ok class... tommorrow well discuss pythagorean theorem

soundengineer

iTrader: (16)

yes....
but I am not sure how to translate this formula into something that I can explain..
http://www.efilive.com/forum/viewtopic.php?t=24
instantaneous net horspower
Weight in LBS * Speed in MPH * acceleration rate MPH difference over time / 8226.63

ls1290

iTrader: (20)

From what I got from the efi site is:

rwhp = mass * velocity * acceleration

where mass is in kg, velocity is in m/s, and acceleration is on m/s^2. I think the 8226.63 is constant to be used with the EFI pis calculation system.

Keith

Robs98SS

iTrader: (1)

J- Rod,

Just out of curiosity, what do you do for a living? You are an endless wealth of knowledge for me and I really enjoy reading your threads. I happen to be finishing up my last weeks of college (I major in Mechanical Engineering) as we read this, so this is all very interesting to me.

btw... This new forums was a great idea. I used to spend hours searching the internal engine forum for threads like these.

Rob

DanO

Welcome... i see you are going to become one of "us", lol

98A4LS1

iTrader: (1)

For the record,
1 gallon of water = 8.335 lb (not 8.03 lb in the original post)
1 gallon of gasoline = 5.8 to 6.5 lb
1 gallon of ethanol = 6.59 lb

J-Rod

I am what is called a Network Engineer by trade. I build, manitain, and troubleshoot the computer network for a rather large financial services company.

Thanks for everyones help in making this successful.

secure

Hi folks

Sorry to bring back this old topic but I have question about a formula.
Some of the ECUs has cylinder# based knock detection abilities. So when the knock occurs it shows which cylinder is commited to knock evidence.

I am just wondering the formula to determine which cylinder is firing in a time manner. Can I find it by calculating from RPM and dwell signal? Any example formula?

adkunlimited

where did i see all this before.... aw yes a book called Auto Math by John Lawlor

1 FMF

iTrader: (1)

How about a gallon per hour (gph) formula?

Can't that be done based off displacement and rpm for a given air/fuel ratio and volumetric efficiency (VE) ?
I happened to be messing with in excel last week to figure out gallons per hour used in my boat. The part I had trouble with was converting cfm of air used into pounds of air, I had trouble finding reliable info or equations for calculating that.

djyannakis

Does one know how to calculate a car's ET based on the elevation, moisture and elevation?

1904gto

iTrader: (4)

this needs to be made into a sticky!

ElkySS

iTrader: (6)

how bout how much cfm a particular throttle body will flow

what cfm each cylinder will need to aid in head selection

02_camaroz28

iTrader: (20)

Is this Flywheel or Wheel HP?

Orange99Z

iTrader: (25)

I downloaded an Android app called Garage Buddy that has some good info.

New technology + smartphone = Handy quick reference guide

L$X$10

iTrader: (4)

nice.

kick_*ss

iTrader: (1)

I changed the EFILive HP calculations to include ME, Gas and the GVW.

Seems that if you are getting the GVW to get HP and logging with YOU in the car and GAS in the car it would be pretty important to add that data. At only 10 Gallons that's another ~63 pounds, and me 185 that isn't counted. Sure ~250 pounds out of 3554 is only 7% but hey if you are going for more precision, why not? But if you have 2 guys (someone logging and someone driving) that could be an additional 300 pound and you are approaching 10%. People pay a lot of money for 10% difference in HP.

I have 2 different ones just for myself, one over 6 polls and one over 12. Mainly because there are times where you are on the highway or on ramp (great flat places in NC) to get a quick 1/4 time and the change over 6 & 12 polls can show you different info.

I used 6.350 for gas, its what I found as the weight. no reason to argue over that, if you like a different amount or run different gas that weight something else, just use that amount.
Enjoy:

*CLC-00-800
hp 0.0 400.0 .0 "(((3554+({GM.FUELREM}*6.350)+185)*{SAE.VSS.mph})* dx({SAE.VSS.mph},6))/8226.63"
*CLC-00-801
hp 0.0 400.0 .0 "(((3554+({GM.FUELREM}*6.350)+185)*{SAE.VSS.mph})* dx({SAE.VSS.mph},12))/8226.63"

CALC.1-HPTRUE6 F601 CLC-00-800 "kW,hp" Performance "TRUE HPx06"
CALC.1-HPTRUE12 F602 CLC-00-801 "kW,hp" Performance "TRUE HPx12"

LS6427

iTrader: (2)

After you all use that stuff to build an engine, run it down the track, then use this table to see what you do 0-60mph. I was surprised........

2.3 second 60' time = 35.5 mph @60' = 7.0 second 0-60mph time
2.2 second 60' time = 37.1 mph @60' = 6.5 second 0-60mph time
2.1 second 60' time = 38.9 mph @60' = 5.9 second 0-60mph time
2.0 second 60' time = 40.9 mph @60' = 5.2 second 0-60mph time
1.9 second 60' time = 43.0 mph @60' = 4.6 second 0-60mph time
1.8 second 60' time = 45.5 mph @60' = 4.0 second 0-60mph time
1.7 second 60' time = 48.1 mph @60' = 3.4 second 0-60mph time
1.6 second 60' time = 51.1 mph @60' = 2.9 second 0-60mph time
1.5 second 60' time = 54.5 mph @60' = 2.2 second 0-60mph time
1.4 second 60' time = 58.4 mph @60' = 1.5 second 0-60mph time
1.36 second 60' time = 60.0 mph @60' = 1.36 second 0-60mph time
1.3 second 60' time = 62.9 mph @60' = 1.2 second 0-60mph time
1.2 second 60' time = 68.1 mph @60' = 1.1 second 0-60mph time
1.1 second 60' time = 74.3 mph @60' = 0.9 second 0-60mph time
1.0 second 60' time = 81.8 mph @60' = 0.7 second 0-60mph time


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