This table is another torque management table. Sounds obvious enough. But, it is a limiter to power which affects the available power and other tables when trying to get full control of all the parameters of an LNF. In other words, anything less than 100% is limiting power. I prefer to control that with my right foot. When adjusted along with the other threads I've posted, you will be able to have a smooth timing table and use the Optimum Torque for boost spike control (off-throttle) in conjunction with the integral PID.
After making these adjustments, you will notice your idle timing is probably way off. That is because this also should be viewed as an urgency table as explained with the Optimum Spark tables. By giving yourself 100% of the torque available, you are changing the scales of some of the reference tables which then need to be adjusted. Not difficult, but takes a couple logs cruising around town.
First, the Optimum Torque table. It's a torque limiting table. Optimum torque shouldn't be anything less than 100% except where you get boost spikes. Here is an example of the table I run. I will explain it, but be careful! Just copy/paste this table will screw up your tune if you haven't adjusted all the other tables along with it.
OPTIMUM TORQUE.png
I request 100% of everything available. You'll see the OT table, although raised from stock, takes a drastic dip in the high rpm & low load areas. This is to control boost spikes. Find those areas where you are spiking and lower the OT table until eventually you can lift with no boost spikes. This table works in conjunction with several others.
One immediate effect you may notice is that your idle timing is locked at -6 degrees. This is because you have now altered the urgency scale of the Optimum Torque table. With a much bigger bag of torque to take from (100% at idle instead of the stock table ~7%), the stock timing referenced is way too low making the ecu think that you are making too much power at idle. Its response, like the Optimum Spark's urgency with negative numbers, is to pull as much timing as possible to cut power.
Take a look at the stock timing table:
stock timing table.png
Notice the odd drop in timing at idle load and rpm followed by a sudden jump at 1k rpm? There are a lot of tables that seem to be poorly adjusted from the factory. In order to fix the idle rpm being locked negative, begin raising the timing in the idle load and rpm regions until you bring your idle back to desired (15-20 degrees, wherever you personally like it). You can start by matching the timing in the 1k rpm row for 15% and 20% loads as a start.
Another side effect which is identical is that you may notice the car lurching when leaving from a start at part throttle. Take a look at your log. What you will notice is the timing taking big negative dips. Same situation, the ecu is fighting what timing is being requested versus its thought that it's making too much power relative to the available torque. Same principle to fix applies.
As you are driving part throttle, gently roll on and off the gas at different rpm. Go back in your log and find the rpm and load at which the timing drop occurs. Raise that cell 2 degrees and log again. When done properly, you will find your timing flatlines with no dips and is exactly what you are commanding.
Also, don't forget that when you make changes to the spark tables you must simultaneously adjust the optimum spark tables so that you don't alter your OS numbers. That's a brief explanation of how to fix the Optimum Torque table.
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Originally Posted by MikeM173
