Hey,

Made a program that I use at work all the time for rx8 motors. Basically you enter in the readings you have (kpa, kgf/cm2[kpa x 100], or psi) as well as the RPM. It takes the numbers, factors in the RPM to adjust them properly and gives you results for each face, differences between faces and chambers and compares them to Mazda's spec to determine if the compression number is good or not.

This is version 1.0.0, I'm still adding things when I get time and when i think I need something additional. I'm going to add something in tonight to take the RPM factored compression number and display it's difference from the spec as well as use colors to help you determine if your motor is green, yellow or red (good, sorta good, and bad, respectively)

This has only been tested on Mac OSX 10.5.4 and 10.5.5, should work on any 10.5 at least (Leopard)

Sorry windows guys I stopped doing windows apps once i switched everything to apple, anyone who does programming in like VB or whatever I can give you the compression formulas (factoring in the RPM is the most difficult part, the formulas simplify that)

UPDATE 1.0.1
-Simply modified output to show the converted compression @250rpm results along with the "good" or "no good" results.
-Added Screenshots
-Some graphing progress, not available yet, next update probably
-Saving of compression results in text file also being finalized so you can track compression, possible quick "comparison" feature.

LINKAGE: http://files.me.com/teknics/n1tjbf

Let me know if the link works or not, hopefully we have some mac users around lol, doubt any of you will see continual use out of this tho.

kevin.

 

This is fantastic !!!!!!!! I wish a guy can make this software work for windows also.

Great work !!!!!

 

I have made an Excel Worksheet that do the same as your program and show the results in a Chart as the Chart below.

What other info do you think is interesting or useful to show with your experience so far ?

 

That's funny, my program started as a personal excel spreadsheet then i got tired of having to wait for the spreadsheet program to load etc.

Your spreadsheet looks like it covers most information points, great job.

I use mine at work fairly frequently, mainly because most of the time the engine doesnt spin at exactly 250rpms (where the spec is based) so i have to be able to quickly adjust for rpm differences. As it is now it does all I need it to do. I was going to add features mainly for the guys that dont work at a dealer. Yours seems to cover most info you can determine from a comp. test.

kevin.

 

Hmmm....looks like I need to get a mac

 

I always have the feeling that RX8 owners owns Macs too. Because of the similar "small" market share \(^.^)/

 

not to get into a computer discussion but.... mac FTMFW.

kevin.

 

I can probably make a program outa this.

Windows Wins ! :P

 

tiny bit off topic sorry but, kevin you work at wayne mazda right? do you guys charge for compression test?

 

want the formulas, i have them all for the conversion, it would be simple. youd only need to make arrays, inputs, outputs and an action button. i wrote it in xcode, mac's main gui type program, the code is objective c.

kevin.

 

in my applications folder.

 

if you just walk in and ask for theyd probably charge an hour.

kevin.

 

Thanks for the program!

 

first time i ever wondered about a mac!

thx..

funny i have a tablet coming for the car!

nycgps, get to work.. it will be dual boot. xp pro and vista 32bit.

beers

beers

 

Another interesting part of my worksheet (Excel under windows) is the ability to compare two compression set of values (or more).

 

Yes they do.

1 hour labor.

Ask me how I know

 

Im thinking maybe I can get it to work under .NET framework.

Or should I put it in Pure Assembler.

.Net framwork will be a lot easier. but unless you're using Vista its not pre-installed.

Plus The work I have on my hand (I still gotta pay bills )

I will try to get something out ASAP.

 

i'll send you the formulas.

IOANNIStsa: so that graph represents 2 rotor's compression values versus another 2 rotor's compression values? Pretty interesting, I'm fully considering adding graphing to my program now, XCode has really easy to use commands for drawing that stuff.

kevin.

 

yea,

sad the tablet i have coming is vista 32bit .. and i ordered it that way. it plays nicer with a couple of programs i use for car stuff.

how odd is that!

damn loss of serial port..

beers

 

updated program slightly, more changes coming soon.

See Original Post for info, new download link, and first screenshot.

kevin.

 

do you still need the rotary compression tester? Can you use a piston compression tester and input the data?

 

this is purely a user-input type program, so you can enter any info in it. It basically just takes your results, converts them to spec (250rpm), and then compares them and determines if they pass or fail.

basically prevents you from doing math

kevin.

 

Man I need that spreadsheet to see my decarb results this weekend.


Kevin, this weekend I will have new numbers for you. I'm an OSX n00b. I only run that on my Mini Mac that stores my music hooked up to the home theater. How do you load this?

 

http://www.imageshack.gr/files/6rewi75hxzovglgjfxgs.jpg

 

Wow - I knew they were bad. OK, now I will test again this weekend. I have done TONS of decarb work, so it will be nice to see if my efforts did anything. The car sure fires up quick and pulls hard again, so keep your fingers crossed.

Thanks!