Not necessarily. Remember, CLC is the instantaneous change in fueling to achieve your current target AFR. The learn table DOES affect your fueling. Whatever the learned value is in that particular cell is a modifier to your base fuel table.

For example: if your base fuel table is 45 in a particular cell, and your learn table is +3 in that same cell, the unit will fuel that area at 48. If you drive down the road and your CLC stays at zero then the learn value will stay at +3 and the base fuel table will remain at 45. However, you are technically fueling at 48. So, yes, the learn table is in fact being used to correctly fuel the engine.

Now you transfer learning to base AND clear out the learned values. That same mentioned cell now reads 48 and the learned table reads zero. Theoretically on the next drive that cell should be the perfect amount of fuel and when in that cell the CLC should be zero. In reality there will be small adjustments and the CLC will be something close to zero, but not zero. If you deviate from zero it should be a small number. This new number if consistent let us say - .75, your new learning number will be - .75. That wiil act as a new modifier to your base number of 48. Your new total number would be 47.25. The 48 remains the base fuel number with the negative .75 added for the new correct fueling. This will always be changing slightly and as your base fuel table becomes more and more accurate the learning values become smaller. It becomes no longer necessary to transfer learn to base, and your CLC numbers also reduce.

Back to the limits tables. Once your operating base table produces small single digit learned values in many of the cells, the software is effectively done mapping your fuel table. Now is the time to clip bad changes to a good tune. There are different strategies you can deploy here. CLC is an instantaneous response to AFR changes with respect to the target AFR. This needs to function to account for atmospheric differences, slight driving style changes, fuel quality etc... to keep your engine running at the right AFR. However those differences don't necessarily need to be learned. They also shouldn't be large either.

Typically a mature base fuel table needs a small amount of CLC, but can have an even smaller amount of allowable learn. For me, once my base table is pretty mature, I limit my CLC to around 15 to 20, and cut my learned level to 10 or less. I also slow my learning down by adjusting the gain from 100% down to 75% or 50%. If you have a sudden need for +15 CLC AND your learn shifts to +10 you are now adding +25% more fuel in a cell that used to only have low single digits. Something is wrong, but +25% would still be drive able if you don't have a limp tune.

Does this explanation help?

KT

 

As always your explanations are spot on. Thanks a bunch.