Hi Robbie,
Glad you like the Motec ECU!
If you're hitting 920Nm the 'Transmission Torque Limit Ignore' setting is correct.
You can check out the channel 'Transmission Torque Limit Throttle' in the logging (if it's setup to log). When you're at full throttle the TCM attempts to limit the maximum torque of the engine and the amount it tries to limit it to is a constant value. The value is dependant on the TCM program age (or year model of the car) and could be 600Nm, 630Nm, 680Nm etc. By setting the 'Transmission Torque Limit Ignore' parameter to the same value as the TCM requests, the ECU ignores this torque limit.
We could have just ignored this request from the TCM completely, but at other times (not full throttle), obeying the TCM torque limit actually improves drivability so we use the 'Ignore' method to conditionally ignore it when we don't want it.
On the Gear based boost limit, the torque limiting system via throttle is a better method of reducing torque than boost limiting, so we do not intend to add a gear based boost limit at this time. There is a Gear torque limit. I'll explain the major advantage of using a torque limit over a boost limit.
With a boost limit based on gear, the turbos only provide just enough boost to for the torque required so when you shift into the next gear and the boost aim is raised you have to wait for the turbos to spool up causing lag in response. When using a torque limit, the manifold pressure required to produce the limited torque is known. The Boost limit is set to the 'Inlet Manifold Pressure Limit' + 'Torque Limit Boost Pressure Margin' so that the turbos provide more boost than required and the throttles close to regulate the inlet manifold pressure to the limit. Because there is additional boost pressure backed up behind the throttles, when the next gear is selected and higher torque limit set, the throttles open allowing the built up boost through giving you almost instant response (no turbo lag).
It's a new way of thinking compared to traditional torque control methods like boost aim comps so it can take the tuners some getting used to. But if you really want a gear based boost limit the 'Torque Limit Boost Pressure Margin' can be set to '0' and this means the boost control only provides just enough boost to make the torque you have set in the Gear Torque Limit. Normally the boost pressure margin would be set to at least 20kPa so it only provides a small amount of extra boost and doesn't work the turbos too hard, but you can set it to say 50kPa or 80kPa depending on how much the torque is increased on gear shift, and have no lag on a step increase of torque.
Hope that helps, and if you have any more questions about the Motec ECU feel free to ask me directly.
Cheers,
Darren.
