heinzboehmer's 2002 Topaz 6MT Coupe

[bmwfnatic]

I would have used a 2k epoxy, and then sealed in the grommet with seam sealer on top. Also this rust is a joke lol, on Euro cars there can be a 15cm2 rot hole there 😂

[heinzboehmer]

I thought about sealing in the grommets, but was not confident that I would be able to keep everything moisture free underneath the undercoat. I do have to say that for some reason the seam sealer thing did not cross my mind though...

I might end up doing that at some point in the future, since the area is easily accessible.

I have used 2K stuff before and agreed that it is miles better than regular rattle cans. However, there's no way I'm spraying that stuff inside a garage with poor ventilation. I don't think I would be able to keep the fumes from entering the house, which is not something I want to have to deal with.

And yes, I know this is essentially a huge overreaction lol. Just figured it would be much easier to solve at this stage, so went for it.

[heinzboehmer]

Couple more quick distractions.

Swapped temporary injector o ring on the IAT with one from WOLFN8TR:



Also attended a fairly wet autox this weekend. Lots and lots of spinning out. Was a blast.

Sheep seemed to be enjoying the weather:



During a couple of the many spins, I learned what ice mode feels like on the MK60. First time it happened (spun 360 deg, feet on clutch and brake, brake pedal pulsing, car rolling backwards at ~20 mph and not slowing down much at all), I thought that ABS was just not very good at slowing the car down in reverse. Pumped the pedal and car came to a stop. However, it happened again at a much slower speed (~10 mph) and it felt distinctly different to normal ABS engagement.

Pedal was pulsing, but the pulses were way lower amplitude than during a normal ABS event. Pedal also got very hard after ~10% travel and additional force from my leg did not translate to any meaningful force at the calipers. Felt similar to pushing it with the engine off and vacuum gone from the booster. Again, couple pumps and the pedal went back to feeling normal.

Thinking back on this, I'm pretty sure the conditions (and my terrible drifting abilities) were triggering ice mode. Pumping the pedal was an almost instinctual reaction (kinda like flicking a switch a bunch of times when it doesn't do what you expect), so it was not as scary as I thought. I bet it's WAY scarier when going into a corner at 120+ mph though!

[ac427]

Couple more quick distractions.

During a couple of the many spins, I learned what ice mode feels like on the MK60. First time it happened (spun 360 deg, feet on clutch and brake, brake pedal pulsing, car rolling backwards at ~20 mph and not slowing down much at all), I thought that ABS was just not very good at slowing the car down in reverse. Pumped the pedal and car came to a stop. However, it happened again at a much slower speed (~10 mph) and it felt distinctly different to normal ABS engagement.

Pedal was pulsing, but the pulses were way lower amplitude than during a normal ABS event. Pedal also got very hard after ~10% travel and additional force from my leg did not translate to any meaningful force at the calipers. Felt similar to pushing it with the engine off and vacuum gone from the booster. Again, couple pumps and the pedal went back to feeling normal.

Thinking back on this, I'm pretty sure the conditions (and my terrible drifting abilities) were triggering ice mode. Pumping the pedal was an almost instinctual reaction (kinda like flicking a switch a bunch of times when it doesn't do what you expect), so it was not as scary as I thought. I bet it's WAY scarier when going into a corner at 120+ mph though!

Looks like lovely weather

What is Ice Mode on the Mk.60, i have never heard of that before?

[heinzboehmer]

Looks like lovely weather

What is Ice Mode on the Mk.60, i have never heard of that before?

Yeah it's not as easy to trigger as on the MK20 (or so I've heard), but same thing.

Basically just an operating mode that the unit goes into when it thinks you're trying to slow down on a very low friction surface (e.g. ice). It drastically reduces braking force at the calipers in an effort to keep the car pointing straight.

[bigjae46]

Thinking back on this, I'm pretty sure the conditions (and my terrible drifting abilities) were triggering ice mode. Pumping the pedal was an almost instinctual reaction (kinda like flicking a switch a bunch of times when it doesn't do what you expect), so it was not as scary as I thought. I bet it's WAY scarier when going into a corner at 120+ mph though!

Interesting. I'm assuming you have the yaw sensor? I've deleted my yaw sensor and I've only run into ice mode a couple of times when I obviously overcook a braking zone while in retard mode. Releasing the brake and reapplying aggressively gets the brakes to bite again. I turn and can brake quite aggressively into a fast sweeper at 125 mph.

I'd really like to know more about how and when ice mode kicks in since panic mode kicks in right after ice mode lol

[heinzboehmer]

Interesting. I'm assuming you have the yaw sensor? I've deleted my yaw sensor and I've only run into ice mode a couple of times when I obviously overcook a braking zone while in retard mode. Releasing the brake and reapplying aggressively gets the brakes to bite again. I turn and can brake quite aggressively into a fast sweeper at 125 mph.

I'd really like to know more about how and when ice mode kicks in since panic mode kicks in right after ice mode lol

Yep, yaw sensor is installed (and functional). I would also love to know what triggers it. What you describe does not sound like fun at all...

[Bry5on]

Next disassembly project?!

[heinzboehmer]

Next disassembly project?!

Didn't you try messing with it at some point only to find that there was something weird with the instruction set?

[Bry5on]

Didn't you try messing with it at some point only to find that there was something weird with the instruction set?

Yeah I couldn’t figure out any instruction sets for the chip - it’s some proprietary traction control focused chip and not a widely used generic one. Above my disassembly pay grade, but maybe not yours!

[heinzboehmer]

Yeah I couldn’t figure out any instruction sets for the chip - it’s some proprietary traction control focused chip and not a widely used generic one. Above my disassembly pay grade, but maybe not yours!

I've had zero luck finding info about the processor. Even after you cut open your spare MK60.

Need to find someone who worked on this thing at TI.

[Bry5on]

I've had zero luck finding info about the processor. Even after you cut open your spare MK60.

Need to find someone who worked on this thing at TI.

Well for the public record, the chip is a Texas Instruments (TI) 990-9377.1D and my EE automotive engineer friend that worked for TI at the time says it was likely a custom fabbed chip by TI for ATE Teves. But didn’t have a lead on anything else.. Maybe someone else reading has a better lead?

[heinzboehmer]

I'll have to ask my HW friends. Unfortunately don't know anyone at TI, but maybe one of them does?

[heinzboehmer]

Picked this up today from a friend of George Hill's:



Feels good to finally have one, have been looking for one forever. Now just need to get all that old adhesive off (destroying my floor and clothes in the process) and wrap it in some new BM134 fabric.

[George Hill]

Love how a plan comes together. I pulled this car out of the woods a couple years ago saving it from the scrap yard. Pretty cool how this part is making its way to California to live on.