Comparing DataMaster and WB Meter values
Thread Starter
Pro
Joined: May 2002
Posts: 678
Likes: 2
From: Lengede
Comparing DataMaster and WB Meter values
I had my tables all set using DataMaster and was pretty close +/-4% of 128BLM.
A couple of days ago I installed the WB Meter from Zeitronix and compared the AFR and BLM values.
Using the WB Meter I found I was running too rich, so I changed my VE table accordingly. My AFR at part throttle is now at about 14.2—14.7, but my DataMaser shows now that I’m way lean, about 128 — 150 BLM. I don’t know which values to trust.
I can send the DM DA and Zeitronix file to anyone that thinks he can help.
Thanks
A couple of days ago I installed the WB Meter from Zeitronix and compared the AFR and BLM values.
Using the WB Meter I found I was running too rich, so I changed my VE table accordingly. My AFR at part throttle is now at about 14.2—14.7, but my DataMaser shows now that I’m way lean, about 128 — 150 BLM. I don’t know which values to trust.
I can send the DM DA and Zeitronix file to anyone that thinks he can help.
Thanks
Instructor
Joined: May 2001
Posts: 186
Likes: 0
From: Midwest
If your BLM was near center you should be at 14.7:1 in the closed loop mode. This is assuming that your Vette's O2 sensors are functioning correctly. If they are, I would suspect your WB Meter. We are finding wide descrepancies with many of these new low cost WBs when comparing to our Horiba WB system on our dyno, possibly their $900 replacement O2 sensors are expensive for a good reason. I would find another vehicle with your WB and see if it reads 14.7 at idle or cruising speeds. If it also reads too rich, it's your WB. Some may ask if you are probing your exhaust properly, but if you were not the WB would be reading too lean instead of too rich.
EJ
EJ
