[insite]

i have goodies coming this week.

the problem
i am getting pulled by cayman S's on the back straight at road atlanta. i am lighter, ergo i am down on power!

the hypothesis
all my mods (3.4L swap, custom intake, cat bypass, headers, race exhaust, pulleys, AC delete, etc) are too much for the stock 996 ECU tune. AF ratios likely incorrect.

the solution
generate current fuel & spark maps
set car up to dyno itself
use AFC to modify AF ratio
determine how fuel is affecting spark
calculate ideal AF map
dial it in


this will be fun! i have an Innovate LC1 wideband O2 sensor & controller. it will hook up to an Innovate OT-2. basically, the wideband sensor AND my OBD II data will be integrated & wirelessly logged to my iPad. the software will take inputs for weight, wheel diameter, frontal area, Cd & gear ratio. i will be able to log spark, AF ratio, RPM, TPS, MAP, calculated load, OPEN/CLOSED MAF state, etc. the log files can be emailed from my iPad to my PC for detailed analysis.

the logs will actually calculate HP & torque. accurate or not, it should at least be precise since it is using the mechanical relationship between RPM & vehicle speed to determine velocity. should be great for analyzing whether a particular change is helping or hurting.

i will have my current spark & AF maps w/ initial dyno in a week or so. after that, the games will commence.

questions / comments in the meantime are appreciated; i know some you have done this before (JAAY!). cheers.