Just got AutoTap and since the Z28 is stored away, I screwed around with it on the Monte Carlo in the driveway. Used Tables, created a log file, and used the space bar to start and stop recording data. Just a few seconds of recording created a 13K file. If one were to do the complete GM driving cycle, it seems like an umpteen gigabyte file would be created. So, what's the correct way to log data to check engine performance while driving? Thanks for any help.

 

The more parameters you ask to be recorded,and the longer the drive is will increase file size.
Autotap has a stupid function in that for every parameter that is recorded, each one also then has its own timestamp that takes up diskspace.

Also the more parameters being recorded, the slower autotap gets and you can loose important data, esp at higher RPMs.

I'd say do not record more then 15 parameters at a time.

If you know left and right side of engine is performing about the same then don't record both B1 and B2 of the same functions.

You want at least, 1 LTFT, 1 front 02 (S1), RPM, MAP, MAF, knock, timing, TPS (angle), injector pulse width, fuel trim cells, delivered torque, IAT.

You could also look at ECT ( water temps) and MPH.

If you need to see both B1 and B2 functions, then get rid of MPH and ECT.

[ February 19, 2002: Message edited by: Team ZR-1 ]</p>

 

Thanks team ZR-1

Actually, what I'm confused about is how to drive the car while logging data. Do you create a file for, say a constant 55 mph, than another one for decellerating, another for wide open throttle, etc.?

I exported to a comma delimited file and saw the time stamps as well as the column headings. Seems like you'd want to get the file into a spread sheet so as to examine it, but how to get just the data into the spreadsheet without the time stamps and headings?

Hope I'm not being too stoopid about this.

 

Take everything into excel and then delete the columns you don't want (all the time stamps) and rearrange the others or better yet when you set up the file on your laptop(pick the parameters) create them in the order you want to see them in excel.

[ February 19, 2002: Message edited by: J&JsTA ]</p>

 

As mentioned, just do a long drive ( I suggest about 10 miles using all RPM range) then after you import into Excel, delete all but one timestamp cols.

Learn to use Excel math commands and make conditions, like for lTFT, if fuel trim cell is less then 20 ( trim 20) then average values in LTFT for each row that meets that condition.

Of if TPS is greater then 80 and trim cell equals 22 then average values for O2 matching those rows.

[quote]Originally posted by Silver99Z:
<strong>Thanks team ZR-1

Actually, what I'm confused about is how to drive the car while logging data. Do you create a file for, say a constant 55 mph, than another one for decellerating, another for wide open throttle, etc.?

I exported to a comma delimited file and saw the time stamps as well as the column headings. Seems like you'd want to get the file into a spread sheet so as to examine it, but how to get just the data into the spreadsheet without the time stamps and headings?

Hope I'm not being too stoopid about this.</strong><hr></blockquote>

[ February 19, 2002: Message edited by: Team ZR-1 ]</p>

 

Okay. Starting to make sense to me. Thanks for your help guys. <img src="gr_stretch.gif" border="0">