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Logging wideband O2 with stock PCM and Datamaster – WRITEUP

Old 09-14-2010, 10:19 PM
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Originally Posted by HungryT/A View Post
Yes, I see no reason why it wouldn't work on '93s. You'll need the Datamaster DA version (right click save: http://www.ttspowersystems.com/softw...A/setup-DA.exe)

I don't have bitstream info for '93, but if it's not byte 30 for A/C pressure, then it wouldn't be so difficult to find it either.
Did anyone ever fine the byte number for a 93?
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Old 09-15-2010, 01:11 AM
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Is there any way to make Datamasters graph this data?
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Old 09-15-2010, 03:07 AM
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Look at ac pressure is all you can do afaik inside of datamaster. Or you can export it to excell and graph it there iirc.
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Old 09-17-2010, 10:50 PM
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Originally Posted by MikeGyver View Post
Is there any way to make Datamasters graph this data?
You can select one of the 4 graph cells to display the AC pressure by double clicking the cell then select the data to display. You would just mouse over each record to get the value.

Or like WS6T3rror said export it to Excel. Go to file then to export engine data then select your AC pressure for the value then whever other value for Excel to graph.
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Old 04-18-2011, 03:14 AM
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Re: Logging wideband O2 with stock PCM and Datamaster – WRITEUP

Originally Posted by guitarguy View Post
thank you. i put thoughs values in and i had to fish around for the byte # it is 23 for a 92 corvette lt1 m6. your math was spot on and this is going to make life easier. thank again
Yes, this is an old, but great thread. I have a 93 Corvette. Should I change the 30 byte value(as explained by OP) to 23 as your 92 Vette is?
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Old 09-02-2014, 12:07 PM
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Re: Logging wideband O2 with stock PCM and Datamaster – WRITEUP

Thanks for this old thread!

-I now can logg my 1994 Z28 with LC-2 wideband O2 sensor

Some remarks:
-The 4.01 version off Datamaster don't work for this, it calculates wrong.
(fixed in 4.10 for international keyboard users)
-The wire for ac pressure is not red/black on a Camaro 1994 Z28, it's plain red.

I used: Datamaster Version 4.10 EE from TTS sytems homepage.

Last edited by alvess; 09-02-2014 at 12:34 PM.
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Old 04-22-2015, 04:00 PM
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Re: Logging wideband O2 with stock PCM and Datamaster – WRITEUP

For those of you guys struggling with the math, you can always just tweak your gain up/down until it matches what's on the display of your device. This is assuming that the device you're working with has a display that shows the current AFR value.

- So basically you just need to find your devices AFR value at 0.00v (Should be in the manual for your device)
- Then take that AFR value and put it in the "offset" field.
- Now put in a gain value, start with something like 0.05
- Then start monitoring data and check to see what the AFR value that shows up in DataMaster is compared to the value on your devices display.
- Now just keep tweaking the gain up/down until you get them to match up.

I would suggest starting with some coarse adjustments (0.04, 0.05, 0.06 etc) to get the value within +/- 1.0 AFR. Then you can start making some fine adjustments (0.042, 0.043, 0.052, 0.053 etc) to get it completely dialed in.

Also on my 1997 SS the A/C Pressure Connector wiring was as follows...

BLK - Ground
RED/BLK - Signal Wire (This is what you need to connect your AFR output to)
GRY - 5v Reference
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