Boost by Gear with OEM Logic

[K4fxd]

That's what I'm getting at, it does re "scale" the APS

Yes and no. The way he set up the tables he posted it will give full power till it hits the limit.

If you look.at the table it is scalable by RPM.

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[mejohn50]

Yes and no. The way he set up the tables he posted it will give full power till it hits the limit.

If you look.at the table it is scalable by RPM.

It does not give full torque until it hits the limit.

It gives requested torque up to the limit. Nothing beyond. The throttle pedal works like normal until it requests a torque value that is higher than the limit, then it goes dead with any more input until the limit is higher than the request.

 

[Grimreaper]

Another layer of flexibility is the manual trans ecu has a DD table for each gear. So if you want to scale for first, you can keep a more linear pedal across 500ftlbs or what ever the tires can put down

 

[K4fxd]

I meant it will not limit power till it hits the limit. If you press 50% and that is 300 ft lbs that is what you get.

If the limit is 250 a d you press 50% you get 250

 

[K4fxd]

Or once you hit the limit the pedal does.nothing

 

[Rolls]

I have attempted to start a write up on how to calibrate this. The section on WOP = WOT and torque calculation is yet to come.

Thanks to Mitch for the help

https://forum.pcmtec.com/topic/2209-howto-torque-by-gear-for-high-power-s550s/

 

[Angrey]

I'm still very unclear on how the pedal position is rescaled (or not rescaled) when limiting the throttle blade to preemptively limit the torque available in that gear.

Again, depending on how this is done, it could be crude or refined.

If the desired load limit for 2nd gear is only 50% of the total torque output the car can make you could do this in one of two ways:

1) You could give whatever the driver/pedal requests at the normally unconstrained pedal profile all the way up until you hit the limit. Then the pedal is essentially dead from that point lower any inputs beyond that point are simply capped at the 50% limit.

2) You could rescale the entire pedal position and travel to reflect the new 50% limit where 0% is still idle, and 100% pedal position is the new 50% limited and the entire travel in between is rescaled to reflect the output available in that gear.

Option 2 makes the most sense from a driver's perspective as the car behaves just like it does in other gears, the only difference is that your maximum torque output in that gear has been recalibrated so that 0-100 is now half of the available output of the motor.

If you choose option 1, it's going to create some really wonky conditions at part throttle.

To make it drive like "normal" you'd need to rescale the APPS for each gear from 0-100% where 100% is the maximum load/torque limit for that gear.

So in our 50% example, if it was a straight linear profile, 0% would be idle, 50% throttle would be 25% output and, 75% pedal would be 37.5% output and 100% pedal would be 50% output. I realize the APPS doesn't follow quite a straight linear curve and it's different depending on which mode the car is in but whatever the profile/curve is for 2nd gear in that mode, take the same profile and just rescale it for the new maximum and minimum at the top and bottom of the pedal travel.

 

[mejohn50]

I'm still very unclear on how the pedal position is rescaled (or not rescaled) when limiting the throttle blade to preemptively limit the torque available in that gear.

Again, depending on how this is done, it could be crude or refined.

If the desired load limit for 2nd gear is only 50% of the total torque output the car can make you could do this in one of two ways:

1) You could give whatever the driver/pedal requests at the normally unconstrained pedal profile all the way up until you hit the limit. Then the pedal is essentially dead from that point lower any inputs beyond that point are simply capped at the 50% limit.

2) You could rescale the entire pedal position and travel to reflect the new 50% limit where 0% is still idle, and 100% pedal position is the new 50% limited and the entire travel in between is rescaled to reflect the output available in that gear.

Option 2 makes the most sense from a driver's perspective as the car behaves just like it does in other gears, the only difference is that your maximum torque output in that gear has been recalibrated so that 0-100 is now half of the available output of the motor.

If you choose option 1, it's going to create some really wonky conditions at part throttle.

To make it drive like "normal" you'd need to rescale the APPS for each gear from 0-100% where 100% is the maximum load/torque limit for that gear.

So in our 50% example, if it was a straight linear profile, 0% would be idle, 50% throttle would be 25% output and, 75% pedal would be 37.5% output and 100% pedal would be 50% output. I realize the APPS doesn't follow quite a straight linear curve and it's different depending on which mode the car is in but whatever the profile/curve is for 2nd gear in that mode, take the same profile and just rescale it for the new maximum and minimum at the top and bottom of the pedal travel.

Nothing about the pedal is rescaled.

Once driver demand hits the torque limit value further pedal input does nothing. Option 1.

 

[Rolls]

I'm still very unclear on how the pedal position is rescaled (or not rescaled) when limiting the throttle blade to preemptively limit the torque available in that gear.

It isn't, it is a hard limit. Assuming you had a perfectly flat torque curve it would be like putting a stopper under your pedal. Obviously torque is not flat, so it will vary, but it will effectively limit the maximum torque, it won't rescale the entire torque the pedal asks for.

Eg if you are making 500nM of Torque and are full throttle and have limited it at 700nM. Nothing will happen.

If you make 700nM at 50% throttle because you have a crazy PD setup then the pedal would effectively hit a hard limit at 50%.

To do what you are suggesting you would a 3D table for each gear with:
Pedal Max VS RPM

This would effectively let you scale the entire pedal travel to make it as if the engine is making less torque the entire way through the pedal travel. This is custom logic that is something we could add, however we need tuners who actually use these functions.

Not directed at you, however as an example we have had CAN Bus flex fuel available for over a year now and we are slowly getting workshops to build kits. So we are only going to release features that tuners will use regularly and find easy to use, otherwise it becomes a terrible ROI as a business.

Right now the easy to use features that everyone is asking for is spark cut, transbrake and pre configured launch control. We are focusing on these first.

 

[K4fxd]

transbrake

Is this going to be available for the 6R80?

 

[engineermike]

@mejohn50 cracked the code to make torque by gear work with the 10r80. However, in 99% sure I can make it work on the M6 (and most likely the 6R80) through pedal scaling if that’s what you really want.

 

[HKusp]

@mejohn50 cracked the code to make torque by gear work with the 10r80. However, in 99% sure I can make it work on the M6 (and most likely the 6R80) through pedal scaling if that’s what you really want.

@mejohn50 responded to me in his initial thread that it was even easier to do on an MT than on the A10.

 

[engineermike]

I’ve done it on an M6 before but it acted as a torque limit just like what mejohn did. But I’m quite certain I can make the manual version rescale the pedal such that it modulates from 0 to whatever-max-you-want is only achieved at WOP.

 

[HKusp]

I’ve done it on an M6 before but it acted as a torque limit just like what mejohn did. But I’m quite certain I can make the manual version rescale the pedal such that it modulates from 0 to whatever-max-you-want is only achieved at WOP.

Well, lets make THAT happen on one of my slots, for sure.

 

[Rolls]

Is this going to be available for the 6R80?

When it is done!

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