I've not characterised what the lean spool code does beyond the need to reduce the enable from 3500 to 2500 on a JDM IX GSR or GT to stop it going lean when you spool up early with VVT, breathing improvements and boost control - I can hit full boost at about 2500-2600 RPM in a high gear, so I don't want it locked to a lean AFR for another 1000 RPM. This does not apply to the US cars which already have the lean spool enable set at low RPM.

What seems to apply to them all is the 7000 RPM lean spool disable that sends a rich IPW step which I move to 7500 RPM just before the rev limiter.

http://john824.fotopic.net/p29823913.html

The above table was from some info posted on openecu, and has the time scaled incorrectly, it is much shorter than this. However, you can see the AFR adjustment that operates in between the enable and disable points, and the AFR value to use below the enable point (which causes the JDM GSR/GT lean spot on spool up).

I can't see any relation to anti-lag.

I've just mapped mine with the lean spool still active because it works for me. Yes the fuel map numbers are about 1 AFR too rich compared to the wideband and I get a small rich offset in higher gears but I don't mind.

 

Just to give a visual of what changing the 1285 value to 2500 rpm (80 hex or same as 1281 value) on an evo IX does to consistency here is a jpeg of a 1-2-3-4 gear pull. Look at the TPS to see when I shift and theirfore the corresponding gear.

 

dats nice...

Did you also log things like accel enrichment?

 

That is pretty much the same findings I had, AFR's are very consistant in every gear. The nice thing about doing this is it allows you full control, if you want to spool lean you still can by tuning the fuel map yourself by blending the target afr's in the transition from low to high load areas. If you want to run rich at peak torque to add a little knock suppression, no problem. Just seems to make the tune come along a lot quicker because your not having to work around the ecu's lean spool logic to get the afr's where you want them.

 

I am one of the mentioned people, I have no driveability issues at all with my car........I drive 44 miles a day / 5 days a week.