Don Terrill’s Speed-Talk

Looking for a simple data logger for air fuel ratio. Not looking for a 1500 dollar system just like simple air fuel ratio for a 4 cylinder. I would put a gauge on ,but it’s during a pull and I can’t watch the gauge to make a decent adjustments. Thanks for the time !

I have a Daytona Sensors WEGO IV, and it seems to work pretty well. Haven't used the logging feature much (yet), but I have played with it a little. I have no basis of comparison, as I've not used other A/F loggers, but for the ~$400 I paid, it seems to do what I need.

We sell a data logger that will measure and log rpm and one Lambda. It sells for $900, including software.

i use the AEM failsafe gage / logger. It works good.

Best bang for the buck is the Innovate LM-2

What tuner said... Innovate

another possibility?
http://performancetrends.com/wide_band_uego.htm

G'day mate

I've used this unit for many years with perfect reliability. It's easy to read while in the car, and datalogs for for detailed analysis afterwards.

http://wbo2.com/3b1/default.htm

Maybe just use a simple gauge and somehow duct tape your phone in front of it and take a video during the run. Bonus is a sound recording. Some of those gauges have a multiplexed display though, and the shutter speed of the camera taking a video makes the number segments look a bit weird because the segments are rapidly flashed on one at a time, and their rate of flashing is not synced to the frame rate of the camera. It may be good enough for what you want though.

Would reading the plugs be better ? Or what would a good desired air/fuel ratio be ?

6 cylinder puller wrote: ↑Thu Sep 05, 2019 10:13 am Looking for a simple data logger for air fuel ratio. Not looking for a 1500 dollar system just like simple air fuel ratio for a 4 cylinder. I would put a gauge on ,but it’s during a pull and I can’t watch the gauge to make a decent adjustments. Thanks for the time !

Just to be clear, you do understand that the previous items mentioned do not make adjustments while going down track? They just record what happened.

Yes I do understand that, just bouncing questions of of people would are a lot better at this than me. Just trying to find a simpler way to help me start to educate myself in how to tune engines better.

I have a very hard time watching the digital WB gauges in real time...

Always thought the analog style would be easier to understand at a glance...

Also, the bigger the gauge the better.. 2 5/8 below:

watching a gage just about took me into the guard rail. An A/F ratio data logger is just a tool that should be used in combination with paying close attention to how your engine runs and what it seems to want. Books will tell you that you want 12.5 - 13.5 for best power but my motor wants 10.5 - 11 according to on track testing. Type of fuel will also play into the calculations as well as weather conditions. Are you tuning for power or fuel economy or both ?

I would never recommend an O2 gauge in a track car; they are useless.

Due to the fact that O2 values change with rpm and that they vary cycle to cycle, a gauge simply does not reveal what is actually going on. Do not look for a single value O2 number; doesn't exist in the real world. A wide range of O2 numbers is always present.

Many cheap O2 devices are far from accurate and cannot be adjusted for type of fuel being used.

In some forms of racing, partial throttle and transitional throttle are important. Now a high speed sample rate along with rpm and throttle position are important.

Bad data can be worse than no data.