[CarAbuser]

Does anyone know why the timing in the low load/rpm area of the table is different on US cars?

I've checked a few different ROMs and all Euro spec cars have a smooth timing spread in the upper left but US spec cars have a strange spike at 1000rpm and below that looks like a typo.

I'm sure it's emissions related but I can't figure why all tuned bins I've seen still have it.


I8A0S US Spec timing table;


IKC0S EU Spec


IMC0S EU Spec


INA0S EU Spec

[135Pats]

Interesting...Yea def. more advance in the low load/cruise area with the US bins.

Hrm....Would wake the throttle up a bit, but that seems extremely unlikely in terms of the reason behind it.

[BQTuning]

Make sure to match it up to the AFR tables also

[mike082802]

Originally Posted by BuraQ

Make sure to match it up to the AFR tables also

please explain. just started playing with my bin in tuner pro.

[CarAbuser]

Originally Posted by BuraQ

Make sure to match it up to the AFR tables also

In what way? The AFR tables look to be pretty similar in the low load / low rpm cells.

The 1M AFRs are a lot leaner but the 335i bins all seem to have the same pattern between US and EU specs.

[spxxx]

Yeah, I have always smoothed out my timing tables and thought it was weird that this burst of timing was there. Maybe for on/off the throttle leaving stop lights to make the car feel more alive from the factory.

I don't think you need to worry too much about matching ignition to AFR @ 700-1000 RPM - not a hugely important area of the powerband

[BQTuning]

Originally Posted by CarAbuser

In what way? The AFR tables look to be pretty similar in the low load / low rpm cells.

The 1M AFRs are a lot leaner but the 335i bins all seem to have the same pattern between US and EU specs.

Spooling AFR are different, look at the X axis between the N54B30 and the N54B30TO ROMs, and INA0S AFR vs ILA0S are different

When they made those timing changes they are also made changes to PID, AFR

Use the 3D table in TP to identify the differences on the base