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Trying to understand lambda overlay

Posted: Wed Nov 05, 2008 11:06 pm
by Scourge
I'm going to attempt a little bit of tuning so that my K-Pro doesn't have to compensate as much in closed loop. My AFR is way off in open loop. :S

I'm trying to understand how the lambda and fuel adjustment tables work... Because no matter what cam angle I change to, the tables remain the same. Only time it changes is when I switch between high and low cam.

So, is the lambda displayed just an average of the recorded lambda independant of the cam angle? Just dependant on the RPM and MAP?

Just wondering as I do know that it's recommended to create final map by creating the composite of a bunch of fuel maps at fixed cam angles. It's just time consuming. :( But it makes sense as it takes the cam angle out of the equation (or breaks it down anyway).

Posted: Thu Nov 06, 2008 4:46 am
by fonz600
Fixing the cam angle is the correct way.
Ticking adjust all angles box is the crude quick way.

Alternatively you can look at your cam1 and cam2 values and make the lambda changes to the corresponding cam angles in the fuel map tables.
E.g you have -5 at 2k-3k in columns 4 and 5 in low cam fuel table. Click on low cam angle table and you'll get where the cam angle should be( or alternatively look at your datlog for where it says the cam is sitting at), lets say it's 20.
Change low fuel table to 20 cam and make your -5 fuel changes on that angle at 2k-3k in columns 4 and 5.

That way is crude and time consuming though.

Locking the angles and keeping the curves smooth is the only way you'll have a car that runs smoothly and with best economy.