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Street Class Unlimited Class
DOHC SOHC Ion Updated 1/05 For the most recent list of the fastest five cars click here. |
Dynosoft
There is hardly a nicer scan tool/software dyno set made for this
tool. It compensates for speed, different gears, and more. You can
even use this setup on all obd-2 cars. This tool also has a built-in
notepad feature that saves along with the "dyno run" file,
so comparing mods is very easy. Find a nice smooth and level bit of road that is convenient to return to. As a minimum you will need to set the scan tool to record the rpm and O2 voltage. In addition to the rpm and O2 voltage I like to record either the manifold pressure sensor (map) signal or the throttle position sensor (tps) signal, just to be sure of where the "run" actually starts. Recording the map signal is pointless if you have a fuel alteration device like an s-afc, turbo, or something similar. Anyone that has one of these devices on their car should record the tps signal if they're interested in viewing additional data. As a side note, the fewer signals you monitor the more accurate your dyno will be due to a better resolution. Now, for the fun part.... Begin driving your car slowly in your desired gear (I like second gear) making sure to keep the rpm's below 2000. Once you're ready let er rip! (unless you have selected map/tps) Pulling the connector off of the car at the end of the run gives the laptop the option to save your data. Save it under a meaningful name for example, I save things as gmmddyy which is the format: gear, month, day, and year. This makes it very easy to go back to at a later time, or just to show the progression of your mods. Before you close the obd-2 scan tool software select "export file" from the file menu and save the file. The scan-tool will ask what time interval you want. You must use seconds. Saving your run in a separate file specifically for exported data makes finding the data that much easier. The saved files will be in *.prn format. Now, open both excel and Ian's (akpinoboy) software. Take a moment to admire all the cool stuff there is on this bit of work.... Ok, back to fun. In excel, select open file. Select the file you exported from the scan-tool. It will be saved as a *.prn file, so in order to import the file into excel tell excel to look for "all files". When you get your file, there will be a little box which has checkboxes in it; select "delimited" then press next, select tab and comma in the "delimiters" field. Click next, and then click finish. You should have a normal looking spreadsheet at this point. It is nearly impossible to get the data to start at the same point, so there will be empty cells, but there should be only 1 item in each cell. You will know if there is a mistake, nothing after this will work. No biggie, just try it again. After you do it right once it is not hard. Now, identify the column which contains rpm on the left side of rpm is a column marked et (sec) delete every other "et" column. This will bring the rpm next to 02s11 (v) which is your o2 sensor voltage, and whatever other stuff you recorded. If you only recorded rpm, and o2 voltage, click the rpm column's header the column will change color/shade. If you recorded rpm, o2, and map/tps, click on the tps/map column (you can only click 1 for the next step) Now that something is highlighted, go to the "data" menu, and select "filter" then select "auto filter" this will cause a small arrow to appear in the column you had highlighted. Click it; a menu will drop down displaying a lot of numbers, and the word "custom." Select "custom." a new menu will popup, where it says equals, select "greater than" then select your minimum rpm during the run (usually about 2000) or if you chose tps 95, or map 28(for English units) or 100 (for metric.) Then click ok. The "run" will be very easy to see now. You may need to delete a few cells before and after the "good parts" but that is not hard. Now, for cool bits. If you do have that display, then simply cut and paste the whole run into Ian's dyno software. The HP and torque at the specific rpm in the row is shown, and the most beautiful part of all is the actual dyno "chart" with an o2-readout on the bottom!!! I personally like to leave my baseline power run in the run 1 field, unless I am comparing stuff like different coolant temperature's effects on power, and the like. Displaying a set of back to back runs with a coolant temp tricked to165^ next to a 200^ run (on an N/A engine) is a nice set of curves… Cool stuff huh? |
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