Grim Reaper

This is part 1 of my MAF experiment. The purpose of this test is only to collect data. Nothing else. Once a number of people have posted this data I will compile all the data into graphs, post them, and then open discussion on them. But for now, this is strictly a data collection forum.

This test is limited to those that have a MAF car capable of maxing the MAF to 255, a scan tool, and a WB O2 Sensor. The test is simple but it may take some time to do it due to the conditions I want you to test.

Once you have your results, post your Injector PW, the MAF gm/Sec, rpm and WB Air Flow Ratio from a WB O2 sensor in a table format like this:

RPM, MAF gm/sec, Injector PW, WB AFR

Also, I would like you to post your PE %Chg AF ratio vs. RPM Table. To REALLY do this test, set all values to the same number (generally the highest rpm level). I realize this will not be optimal, but with the PE %Chq AF Ratio vs. RPM set to all the same value, then the experiment shows even more. Your choice - just post the table but do try setting the PE table to all the same value (preferrably the highest value your currently using in your PE table to minimize potential damage to your motor). I am more concerned with safety than with optimal tune.

Here's the test:

You need to operate under two condition extreme conditions with a MAF maxed at 255 and in PE. The two extreme conditions are:

1) Obtain a scan reading from low level (sea level is best) on a very cool day. Say 40-45*F.

2) Obtain a scan reading from a high elevation (3,000 or higher is best) on a very hot day ... the hotter the better.

I realize it may not be practical to do the "preferred" conditions (low elevation on a cool day vs high elevation on a hot day). I have selected these extremes because the difference in air density will be the greatest while both maxing the MAF.

Lastly, when posting please describe your engine amd all particulars, the elevation, temperature, baro (if possible) and the location where you performed these tests.

For the moment, I am not really interested in any comments at this point. I only want data - nothing else. In fact, I am requesting that Tim delete ALL none data responses to this post. If there is something you need clarified, send me an e-mail - DO NOT POST HERE. Your chance to review and digest the data will come.

Hopefully Tim will make this a "sticky" as many of you may have to wait a few months to either have the weather change (summer vs. fall/spring) and when you may need to take a trip to do one of the different elevations (not everyone can travel from sea level to 3000+ft in a short distance).

Stay tuned for the second experiment.