4doorfury

iTrader: (1)

For people who are tuned, what do you log for timing when doing a 4th gear pull? Trying to see how much timing advance is typical over OEM map. Thanks.

bythabay

iTrader: (2)

SonicVQ

I use OBD Fusion with a fast OBD scanner and can record 40+ PIDs per second.

As for trying to understand the ignition map, there are too many variables to be able to make sense out of other people's data.
The ignition timing is determined by: engine load, engine RPM, coolant temp, air/fuel ratio, intake air temp, barometric pressure, fuel temp and fuel quality. (ex: winter fuel, E10, etc)

4doorfury

iTrader: (1)

I have an older unit that plugs into the obd port and reads a/f timing etc...lots of parameters. I spoke with a few of the bigger tuners for our platform and they all confirmed OEM targets approx 27-30 degrees under good conditions. I'm well aware our ECU uses a variety of inputs to calculate the timing.

SonicVQ

Interesting... I data logged a bunch of PIDs when I went drag racing with a bone stock G37 Sport Sedan and the ignition timing reported via OBD was max 22-24 degrees.
Fuel temp was 32C, oil temp 91C, coolant temp 90C, AFR 11.8 - 12.0.

4doorfury

iTrader: (1)

I'm definitely seeing up to 30 degrees with my setup untuned. I am running a 2.5" maf housing though but car runs extremely well. Afr hover around 12.5:1

I ask this originally because I bought octane booster made by Royal purple to see how our cars responded and it actually decreased ignition advance down to like 20-24 degrees.