Needing torque control

Testing and development of Megasquirt 3

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jeffmarsh750
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Needing torque control

Post by jeffmarsh750 »

Looking to be able to cut power during shift, such as retarding timing at the shift point and it must be able to be ramped back in, not just a cut and then back on.
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mega_user
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Re: Needing torque control

Post by mega_user »

It is quite often used in race cars with dog box transmissions. A full spark cut is a little bit hard on the transmission. It should be simple to add spark retard in the firmware to sequential shift cut setting.
samh
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Re: Needing torque control

Post by samh »

Yes A retard after shift would be extremely useful!
samh
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Re: Needing torque control

Post by samh »

Is this a possibility? Can this be added to current code with out a major code rewrite?
jeffmarsh750
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Re: Needing torque control

Post by jeffmarsh750 »

Would also like Torque Control for driveline target speed. I am going to switch ECU's if this can't be available in the next month or so.
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thokes82
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Re: Needing torque control

Post by thokes82 »

Yes, we need this...
Wasn't the first request of this kind http://www.msextra.com/forums/viewtopic ... 25&t=67369
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Re: Needing torque control

Post by wes kiser »

Although I agree all the "bones" to implement this as a feature are already in place (and it could be easy/useful), there is a bit of a workaround available to do this if you wanted/needed it in the meantime.

The "on/off" based knock control could be used to do this. It could either be tied directly to a physical input, or a software loop. All the required retard and recovery timers and tuning parameters you would need are already there. Not saying a simple "retard to" and "recovery time" tied to either flatshfit or sequential shift cut would not be a better way to accomplish this, simply explaining how the same thing can be accomplished via existing features in the mean time.
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jeffmarsh750
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Re: Needing torque control

Post by jeffmarsh750 »

Any luck on this yet ? It's all most race season.
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silverfrostlsc
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Re: Needing torque control

Post by silverfrostlsc »

I need this too.
Could I switch ignition maps during a shift? That way i could have a variable "ignition retard" based on load. would that work?
93supercoupe
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Re: Needing torque control

Post by 93supercoupe »

Using torque could be helpful for alot of things, including power management
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Doncis
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Re: Needing torque control

Post by Doncis »

It would be very useful feature.
93supercoupe
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Re: Needing torque control

Post by 93supercoupe »

DBW would make torque command/control very very effective.
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Re: Needing torque control

Post by Reverant »

I don't think most people understand how complex torque control is. It's not something "you can add". The ECU needs to be built from scratch around torque control and yes, DBW is almost mandatory for proper torque control.
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Re: Needing torque control

Post by Paul_VR6 »

Most of the ecus I tune that have torque control I want to throw out the window.
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93supercoupe
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Re: Needing torque control

Post by 93supercoupe »

Paul_VR6 wrote:Most of the ecus I tune that have torque control I want to throw out the window.
i agree for stock ecu's. What a night mare.
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Re: Needing torque control

Post by BigBlockMopar »

Why not put lower advance numbers in the timing table at the high (shift) rpms where the engine sees less loads?
Or a timing table switch which is activated by the clutch or a transmission pressure sender?

Or does one need the timing change right before the shift starts?
Just spawning some ideas here, but I get if it was that easy if wouldn't have been a needed feature.
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jeffmarsh750
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Re: Needing torque control

Post by jeffmarsh750 »

Timing needs to be pulled as it starts to shift and ramp back in as it completes the shift. And different amounts for different gears
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jeffmarsh750
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Re: Needing torque control

Post by jeffmarsh750 »

Any luck with this yet ?
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mazdaspeed
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Re: Needing torque control

Post by mazdaspeed »

Im also pretty keen on this

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AiToR51
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Re: Needing torque control

Post by AiToR51 »

it could be nice to have this function implemented. I have an autogearbox that is too hard on shifts, also sometimes when changing from 2 to 3 gear it wheelspins if turbo is loaded. If i could de-torque when shifting could be much nicer to drive. My TCU controller for 722.6 gearbox can give me an output when shifting.

Tried ignition cut on changes, but it's excessive.

I would like to see a new option that could enable configuration like:
- ignition retard - x degrees
- Boost cut, set boost control to 0%


In ms2 when needing special functions i modded the firmware and tunerstudio profile, but for ms3 i don't see last firmware source code, only 1.4.x
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