Black & Tan 332iT

[Obioban]

I think the brake pressure sensors are the upstream ones on the master cylinder, right? I’m not sure if they’d show any pressure while DSC is cycling an individual wheel. Are you prompting the D-bus to get it to send out the pressure data? I could do this temporarily - I don’t like to use the d-bus for my regular logs because it’s so slow.



I think the wavetrac looks more like an open diff than a clutch diff, as it doesn’t have a torque distribution by speed differential. Clutch diffs are always trying to straighten out the car by making the rear wheel speed the same, where the wavetrac is totally alright with differential speed. But without knowing what’s in the model, it’s hard to say honestly.

I guess I was just thinking about it from an acceleration perspective…Where I’d think the open diff model would be braking the spinning tire sooner, to route power to the other tire… and the m variable lock model would be designed to allow a bit of one wheel peel to allow the diff to function (as you’d also want with the wavetrac).

[Bry5on]

I guess I was just thinking about it from an acceleration perspective…Where I’d think the open diff model would be braking the spinning tire sooner, to route power to the other tire… and the m variable lock model would be designed to allow a bit of one wheel peel to allow the diff to function (as you’d also want with the wavetrac).

It doesn’t seem to have affected when TC kicks in - and my guess is actually the inverse of yours as there are separate settings for enabling torque control by brake. I figured it was part of the model for expected yaw calculation. Wish we could decompile this!

I actually dug back into my datalog and it does look like the LF wheel speed gets significantly noisier during DSC control. That would mean that it’s the oversteer model that’s fighting me, which is what logic would dictate with the stiffer chassis and eliminated steering bushing. Essentially, the car is more responsive to my inputs and that is telling the DSC that it’s oversteering because it’s yawing ‘too much’

[YoitsTmac]

It doesn’t seem to have affected when TC kicks in - and my guess is actually the inverse of yours as there are separate settings for enabling torque control by brake. I figured it was part of the model for expected yaw calculation. Wish we could decompile this!

I actually dug back into my datalog and it does look like the LF wheel speed gets significantly noisier during DSC control. That would mean that it’s the oversteer model that’s fighting me, which is what logic would dictate with the stiffer chassis and eliminated steering bushing. Essentially, the car is more responsive to my inputs and that is telling the DSC that it’s oversteering because it’s yawing ‘too much’

Would you want Mk60e5 firmware if you could? Thats the last CAN based unit out there. It’ll project pressure and needs a wake and translator, but could technically work. Has internal pressure sensors too. Bluebimma on Instagram overcame the WSS with a factory WSS but didn’t state which one. Actually, I’m on mobile but you may already know from your wheel hub on your custom knuckle.

I only ask because I was looking into it this weekend. Really wanted mk100 but flexray is a black box to me

[bigjae46]

It doesn’t seem to have affected when TC kicks in - and my guess is actually the inverse of yours as there are separate settings for enabling torque control by brake. I figured it was part of the model for expected yaw calculation. Wish we could decompile this!

I actually dug back into my datalog and it does look like the LF wheel speed gets significantly noisier during DSC control. That would mean that it’s the oversteer model that’s fighting me, which is what logic would dictate with the stiffer chassis and eliminated steering bushing. Essentially, the car is more responsive to my inputs and that is telling the DSC that it’s oversteering because it’s yawing ‘too much’

Now that I think about it, you can use wheel speed readings. When a wheel spins are slips you'll see a deviation from the other tire speed readings. I use that to see how much I'm into the ABS when I overcook a turn or go off track...lol.

I can lend you my AiM Solo2DL for a week or two. It can log wheel speed DATA through CAN. It is a quick and easy 4 wire install.

[bigjae46]

Well on D-Bus like you said, sure. I was looking into reading directly from sensor voltage but I was looking for at least 10hz

MK60 Brake Pressure Sensor Data – GSR Motorsports

[YoitsTmac]

MK60 Brake Pressure Sensor Data – GSR Motorsports

MK60 Brake Pressure Sensor Data – GSR Motorsports

Yeah but I was looking for something I could throw in any e46 and start logging with other data. I did explore tapping in at the source and converting voltage but opted against it as it was only one of many sensors I wanted.

[Bry5on]

Would you want Mk60e5 firmware if you could? Thats the last CAN based unit out there. It’ll project pressure and needs a wake and translator, but could technically work. Has internal pressure sensors too. Bluebimma on Instagram overcame the WSS with a factory WSS but didn’t state which one. Actually, I’m on mobile but you may already know from your wheel hub on your custom knuckle.

I only ask because I was looking into it this weekend. Really wanted mk100 but flexray is a black box to me

Yes that would be awesome. I’d love to do the MK60e5 conversion to customize the intervention even more

[YoitsTmac]

Yes that would be awesome. I’d love to do the MK60e5 conversion to customize the intervention even more

This man ran so you can fly: https://happycactusgarage.com/products/mk60-companion

Edit: my bad, that’s only ABS. Still needs a translator in the middle for DSC. But it’s in my back pocket.

[Bry5on]

Now that I think about it, you can use wheel speed readings. When a wheel spins are slips you'll see a deviation from the other tire speed readings. I use that to see how much I'm into the ABS when I overcook a turn or go off track...lol.

I can lend you my AiM Solo2DL for a week or two. It can log wheel speed DATA through CAN. It is a quick and easy 4 wire install.

Yeah it’s just the mild intervention so it’s not like an ABS pulse where the wheel materially slows. You can see all the wheel speeds in my CAN datalog above. The FL during a right hand corner DSC intervention starts to look a little noisier than the others but it’s pretty subtle. I’m pretty convinced that’s the wheel that’s seeing the drag torque intervention and it’s the oversteer model that’s messing me up. I think a modification to the steering angle characteristic curve could be the easier hack if we could figure out how to do it.

[YoitsTmac]

Yeah it’s just the mild intervention so it’s not like an ABS pulse where the wheel materially slows. You can see all the wheel speeds in my CAN datalog above. The FL during a right hand corner DSC intervention starts to look a little noisier than the others but it’s pretty subtle. I’m pretty convinced that’s the wheel that’s seeing the drag torque intervention and it’s the oversteer model that’s messing me up. I think a modification to the steering angle characteristic curve could be the easier hack if we could figure out how to do it.

Can you provide me a raw can dump of when you’re getting intervention you don’t like? I already got someone with an e90 willing to log

[Bry5on]

Can you provide me a raw can dump of when you’re getting intervention you don’t like? I already got someone with an e90 willing to log

Yeah it's linked a few posts earlier, here ya go: https://datazap.me/u/bry5on/logs/cmu...44&axes=shared

[YoitsTmac]

I meant a raw dump of the entire bus. If not, it’s okay.

[Bry5on]

I meant a raw dump of the entire bus. If not, it’s okay.

Pretty much every parameter that's available on the bus is logged in that datalog - he just wants a CAN dump? I don't log that

[YoitsTmac]

I understand the issue now. Apologies. This is brake intervention and not engine DSC intervention.