mkhuffman

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I thought if I put a heavy load on the car, accelerating hard up a mountain road, it might induce the failure.

There is a mountain near my mom’s house in Roanoke that I have never driven on with my MME, but in a previous car had a blast going up. I think @tannerk89 is familiar with this road.

Ford Mustang Mach-E I tried to kill my HVBJB and failed. I can’t wait to try again! Screenshot 2023-01-16 083853


It was so much fun tearing around 25 mph and 30 mph turns at up to 75 mph. Maybe a little faster a few times.

Ford Mustang Mach-E I tried to kill my HVBJB and failed. I can’t wait to try again! 1674871585126


I learned three things:
  1. It is so freaking fun to drive this car on roads like this. I wish I had these kinds of roads near my house. Wow.
  2. I need better tires. The stock tires are fine, and definitely good for low rolling resistance, but there was a lot of sliding. I could have pushed harder. I think I am going to replace them with Continental DWS 06+ tires when they need to be replaced.
  3. I could probably kill my HVBJB if I keep doing things like this. Just like @heisnuts did. Crazy man.
I took measurements using my OBDII scanner during the shenanigans.

As you can see in the graph below, when the truck lane opened up and I did my first WOT up the mountain, I hit just under 1050 Amps. However, interestingly, all my subsequent WOTs never go that high. I wonder why that is the case? I charged the battery to 100% before doing this, so it wasn’t due to a lower charge. But for some reason, after that initial 1050 pull, the highest WOT was around 670 Amps.

Q-wrpgiCE6VRnA9pxs3DOLUeooX_ZEgQ0K5K17xf8mHQfeLTeA.jpg


I had never bothered to measure my HVB current during previous WOTs, so later in the week I did a few to see how high I could make the current go. Every time I hit around 1050 Amps. But of course the load on the battery was much lower before and after those WOTs. See below.

vNVFCNWW0M4vKciwtySDIS4JTZJq0iQKrGapAi7iRnxMw3N4LA.jpg


Looking through Todd’s data aggregation thread, https://www.macheforum.com/site/threads/data-hvbjb-mega-data-aggregation-thread.21198/, there are multiple failures with current in the range where I was pushing my car: 736.4, 831, 671.7, 680, 733.2, 766.2, and so on. But I think in many cases, it was not a one time event that killed the HVBJB, it was constant high current over a period of time, with maybe some WOTs throughout. Sort of like what I did.

Ford Mustang Mach-E I tried to kill my HVBJB and failed. I can’t wait to try again! 1674870744490


My little drive up the mountain was only two minutes long. Sort of like a roller coaster at an amusement park. A lot like that, actually! A longer drive would have been a lot harder on the HVBJB.

Take a ride with me up the mountain!

 

scoopman

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I think if you did a couple more of these, and throw in a DCFC in there too back from very low SOC to high SOC, you'll get yourself the toasted HVBJB meal you're looking for.
 

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I thought if I put a heavy load on the car, accelerating hard up a mountain road, it might induce the failure.

There is a mountain near my mom’s house in Roanoke that I have never driven on with my MME, but in a previous car had a blast going up. I think @tannerk89 is familiar with this road.

Ford Mustang Mach-E I tried to kill my HVBJB and failed. I can’t wait to try again! Drive up Bent Mountain_02


It was so much fun tearing around 25 mph and 30 mph turns at up to 75 mph. Maybe a little faster a few times.

Ford Mustang Mach-E I tried to kill my HVBJB and failed. I can’t wait to try again! Drive up Bent Mountain_02
I'm familiar with that area! I lived in Boones Mill many years ago while working at Orvis in Roanoke. That was a fun road! Wish I would have had the MME back then, I'd have made up reasons to drive through there.
 

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Mad Man Mike trying to blow the HVBJB! Keep at it. You’ll melt it. I have a stretch of road in mind not too far from me I think will do the trick over the course of several tries if I mash it several times getting to the hill and then mash it going up. I’m not willing to try it right now though. 😱🐩
 

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Neat! Once it warms up I'm booking a high performance driving class. Should be a couple hours on the track, and then going to DCFC right before and again during the lunch break. Only downside is I don't think I'll get a refund on the class if I manage to break the HVBJB :p

On the Amps, seems like once everything starts getting hot it should start to naturally slow down that current. It is a way bigger drop than I would have guessed though.
 


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😂 Now you can see why I am so addicted. The video just does not give you the feeling of the acceleration and feel of the road.

I think you are correct. It’s not a one or two time event that makes the HVBJB fail. It is a gradual deterioration of the contact points that happen a lot faster with that kind of driving. In my case it’s about 6,000 miles. I just hope that I am truly the outlier and that as these rack up 50K, 60K, etc that we don’t see a high rate of failure with “normal” use with “normal” drivers.
 

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Ship it to Hawaii island. DCFC to 100% in Kamuela. Hightail it on a 2 lane road to the Daniel K. You’ll still be at 100% soc. Drive up the DKI highway as fast as you can. The average grade is slightly below 7% with two sections above 10% and several at 8%. I’ve “heard” you can get to the speed governor limit and drop miles per kWh down below 1.0. At the 10 mile mark or so where the slope lessens, turn around and repeat. Congratulations, your car will be at the mercy of the local dealer. ;)
 

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Mad Man Mike trying to blow the HVBJB! Keep at it. You’ll melt it. I have a stretch of road in mind not too far from me I think will do the trick over the course of several tries if I mash it several times getting to the hill and then mash it going up. I’m not willing to try it right now though. 😱🐩
Where? Please! (I was thinking about doing this before the holidays and leave it at the dealership while we were away but I decided against it - i.e., I mentioned it to my wife 🤣)
 

HOLOTYPE

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Wow this is interesting! And making me wonder if I’ll ever encounter the failure in flat Florida 😂
 

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I learned three things:
  1. It is so freaking fun to drive this car on roads like this. I wish I had these kinds of roads near my house. Wow.
  2. I need better tires. The stock tires are fine, and definitely good for low rolling resistance, but there was a lot of sliding. I could have pushed harder. I think I am going to replace them with Continental DWS 06+ tires when they need to be replaced.
  3. I could probably kill my HVBJB if I keep doing things like this. Just like @heisnuts did. Crazy man.
But for some reason, after that initial 1050 pull, the highest WOT was around 670 Amps.
1. Curvy roads is what we live for. HFBC :p
2. When it is time to replace them I will be looking at 245's. A few threads here relating to going wider. Physics says they should not roll over as easy.
3. I find you can get the same but more controlled pull with smooth foot acceleration and no WOT's. I am done with looking for the passing gear since it is not there. I guess if the HVJB goes again it does but not pushing it to. Bet blowing the HVJB was a continuous worry for you through those curves and spoiled all the fun. ;)

It is fun to drive. It is the slope of that red line that does that I think.
 

Guss-E 2021

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Well that was fun. Thanks for the ride! What was the elevation gain? Hey Ford new test road for the Mach-E. Just sayin'.
 

tannerk89

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Where? Please! (I was thinking about doing this before the holidays and leave it at the dealership while we were away but I decided against it - i.e., I mentioned it to my wife 🤣)
Drive i81 down to Brugh’s Mill Country Store where they have a few 150-350kW DCFC then follow this route… if you don’t kill it by there you won’t regret the incredible drive!
Ford Mustang Mach-E I tried to kill my HVBJB and failed. I can’t wait to try again! A777601C-0082-4C99-80FB-836EBC67A051

Edit : that would be a long drive for you to get to the staring point! Thought you were in VA for some reason 😂
 
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tannerk89

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I thought if I put a heavy load on the car, accelerating hard up a mountain road, it might induce the failure.

There is a mountain near my mom’s house in Roanoke that I have never driven on with my MME, but in a previous car had a blast going up. I think @tannerk89 is familiar with this road.

Ford Mustang Mach-E I tried to kill my HVBJB and failed. I can’t wait to try again! A777601C-0082-4C99-80FB-836EBC67A051


It was so much fun tearing around 25 mph and 30 mph turns at up to 75 mph. Maybe a little faster a few times.

Ford Mustang Mach-E I tried to kill my HVBJB and failed. I can’t wait to try again! A777601C-0082-4C99-80FB-836EBC67A051


I learned three things:
  1. It is so freaking fun to drive this car on roads like this. I wish I had these kinds of roads near my house. Wow.
  2. I need better tires. The stock tires are fine, and definitely good for low rolling resistance, but there was a lot of sliding. I could have pushed harder. I think I am going to replace them with Continental DWS 06+ tires when they need to be replaced.
  3. I could probably kill my HVBJB if I keep doing things like this. Just like @heisnuts did. Crazy man.
I took measurements using my OBDII scanner during the shenanigans.

As you can see in the graph below, when the truck lane opened up and I did my first WOT up the mountain, I hit just under 1050 Amps. However, interestingly, all my subsequent WOTs never go that high. I wonder why that is the case? I charged the battery to 100% before doing this, so it wasn’t due to a lower charge. But for some reason, after that initial 1050 pull, the highest WOT was around 670 Amps.

Ford Mustang Mach-E I tried to kill my HVBJB and failed. I can’t wait to try again! A777601C-0082-4C99-80FB-836EBC67A051


I had never bothered to measure my HVB current during previous WOTs, so later in the week I did a few to see how high I could make the current go. Every time I hit around 1050 Amps. But of course the load on the battery was much lower before and after those WOTs. See below.

Ford Mustang Mach-E I tried to kill my HVBJB and failed. I can’t wait to try again! A777601C-0082-4C99-80FB-836EBC67A051


Looking through Todd’s data aggregation thread, https://www.macheforum.com/site/threads/data-hvbjb-mega-data-aggregation-thread.21198/, there are multiple failures with current in the range where I was pushing my car: 736.4, 831, 671.7, 680, 733.2, 766.2, and so on. But I think in many cases, it was not a one time event that killed the HVBJB, it was constant high current over a period of time, with maybe some WOTs throughout. Sort of like what I did.

Ford Mustang Mach-E I tried to kill my HVBJB and failed. I can’t wait to try again! A777601C-0082-4C99-80FB-836EBC67A051


My little drive up the mountain was only two minutes long. Sort of like a roller coaster at an amusement park. A lot like that, actually! A longer drive would have been a lot harder on the HVBJB.

Take a ride with me up the mountain!

Absolutely love that road, it’s an awesome view getting up that ridge. I’m ashamed to say I haven’t been back on that road since I’ve put on the sway bars and new tires (I went with Michelin Pilot Sport AS4’s, definitely added significant grip to my premium 4X) 😅
 
 




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