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Member
Join Date: Dec 2009
Location: Hainesport, NJ
Posts: 123
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I get a lot of questions on O2's so I put this post to help inform guys on what is going on with O2. (ok, I need money for my junk
![]() Q1 - what is O2 and how does it compare to EGT? O2 samples the exhaust like EGT but takes lots of samples and uses a heated sensor to get your actual Air-Fuel-ratio in a very short time (like .003 sec) O2 reads all the way down the track (including on the 2-step). So if your car goes way rich for .7 of a second if it comes down a bit hard after a wheel stand, O2 will see that and show you on the graph EGT will not. EGT is best at showing "peak" at the stripe. EGT is cheaper and easier to use. Q2 - What components are in a O2 "kit"? There are 3 categories Gauges - Auto Meter, Innovate, AEM Typical prices $200 Instruments - AFX, FAST, Daytona, Innovate LM-1 & 2 Typical prices $250 - $325 - some of these have a memory to replay the O2 info one the screen or laptop. Data Logger Input boxes - all the logger companies have their own deal plus you can use AFX, Innovate, Daytona to send info to the logger. $200-$350 Here is the Racepak single channel unit: ![]() Almost all the companies have the controller & sensor - the V-net deal is Racepak. Most use the Bosch sensor that came OEM on bazillion Hondas & VW's. Replacement sensors are about $80 from logger companies. You can buy the sensor for $55 from local auto parts store but some companies use a different plug. Leaded fuels will hurt the sensor. Life varies a lot but 95% of the guys go a full season without needing a new sensor. Q3. Where do I put the bungs? The best place is in a primary tube. This is the official recommendation on Racepak and Innovate. The reason is to get the truest sample of exhaust gas - in the collector you frequently get back pulses of clear air. ![]() Q4 - Does the 2 channel unit take 2 channels of the Racepak Sportsman and how long are the wires? Yes, it does take 2 channels of the Sportsman or V300. The wires are easily long enough to reach primary tubes on each side. almost 48" when you combine the controller extension wires and the sensors. Also, one of the features of the 2 channel unit is that it can be upgraded to 4 channel. ![]() Q5 - what is lambda?Lambda is a fuel independent display method. All the O2's sample at hundreds of times per second and come up with the content of the exhaust. Based on software settings your O2 will display in gasoline Air-Fuel ratios, methanol A-F's, lambda (and other fuels). My analogy is your digital dial caliper - you grab a piece of 1/8" steel - it reads .125 - you push the button for metric and it shows 3.17 - same steel just displayed in a different method. Q6 - what kind of readings are good? 12.5 - 12.8 usually makes best power before torque peak. After that 12.9 -13.0. There is no perfect reading and yes ignition timing can influence the number. Give me a call or e-mail with any questions. Greg |
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