Data, charts and Freescan.... insomnia cure..

Ok - I've started to break down the data files form Freescan. As I work with data and charts all day at work then I find this straightforward enough to do. It's just another number of variables to analyse - trick is to know the significance of values and this is where the Freescan manual is invaluable. For most this is a quick road to sleepyville.. I acually quite enjoy it and may write a quick macro once I know what data I will always pull from a csv file and what format I'd want it in. Charta are so much easier to comprehend than mindless tables of data upon data... zzzzz

Rechecked and sorted my figures and removed nil values such as off throttle position readings or idle values - end result is that TPS shows good readings and a linear movement between TPS-Volt and TPS position. I will run a steadier run @ weekend by gradually increasing and decreasing throttle/revs to double check. Pretty sure TPS is fine.

However the O2 (Lambda) readings are a bit strange - also they show a very lean reading at idle (<0.03-0.3) and off throttle yet rich to very rich reading (>0.3-0.9) on throttle - this may be due to the O2 sensor and I'm replacing that shortly from SJ Sportcars. Knock reading appears to be ramping up continually at idle with a few occasional knock retard recorded at max revs at idle (not recommended..). Will check Knock at next outing where engine loads are more realistic and there's positive airflow, full throttle etc.

Air-fuel shows 13 (measures 12.9 on wide band lambda) under load and 13.5 at idle or off throttle.. a bit lean..

Iffy idle is due to absence of an IAC and set idle to 1200 rpm. Not sure if this is playing havoc with the O2 at idle or not. Hole is blanked off and sealed with small pipe extruding.

MAP readings look good and rise steadily in line with revs with no obvious drop off. However thes ereadoings are not so relevant until car is on the move. At least they don't indicate a vacuum leak.. yet.

However spark advance does looks off and dips significantly between 2500-3000 revs where there is also a flat spot in the O2 reading. There are notes to run plugs one stage colder than std and may give that a go.