Above is my latest graph of my current (new) motor.  The motor is a huge bore (4.250) short stroke motor built in a Dart 302 block.  The carburetor was built for the motor by Patrick at ProSystems (www.pro-system.com).  As you can see above, the mixture is slightly on the lean side of my safe "target" of 13.5:1.  Don't ask me where I came up with that number - I don't remember.  The mixture is very well controlled and in the safe area of about 14 - 14.2:1 during hard acceleration.  If you compare this graph to one taken of the old motor with the old carburetor below, you'll see that this graph's scale is much smaller, the mixture is much more controlled throughout the lap.

Another point worth mentioning - this is with zero changes to the carb.  It arrived from Pro-System and was bolted on to the intake.  I did supply pro-system with as much information about the motor that I could, including a dyno chart of the motor with a different carb. 

The above graph displays lateral G forces (cornering force) in red, and for reference the voltage output from the Air Fuel controller in blue. Left turns are displayed as a negative number, and right turns are positive numbers.  The first droop negative is Turn 1, then turn two.  The Positive (right) turn is the off camber turn three, then on through to turn 15 at the end of the graph.  This is one lap, from turn 1 to turn 15 at Thunderhill, on 6/18/04.

OLD MOTOR DATA

This graph is to display the Air Fuel Ratio. The yellow line represents a 12:1 mixture.  Notice how under acceleration the ratio is basically centered about this 12:1 line.  The high spots above the 15 line (lean moments) are when I let off the throttle,  the motor is barely working or de-accelerating at that time, so the lean condition is ok.   I think I would like for the motor to center itself around the 13.3:1 area, so I may try to lean the mixture just a little bit. There are a few very rich spikes immediately after stabbing the throttle that would be nice to clean up as well, but at the moment that is not a major concern. Otherwise, I am very happy with the crispness of the and stability of the mixture. It seems to get to where it is going, and stabilizes itself rather well. 

I have since added a TPS (Throttle Position Sensor) and Pyrometer sensors for measuring temps of Tires / rotors / anything else that I want to measure temps of. Data from those new sensors will be up here some time soon... 

Also I am becoming very interested in suspension geometry, and I think for the next event I'll be logging various suspension issues to help with suspension tuning. 

The red line in the above graph, is the voltage output from my G meter, just for track position reference.

Below are some more pictures.  These were taken by my brother, Terry.