mkhuffman
Well-Known Member
- First Name
- Mike
- Joined
- Nov 19, 2020
- Threads
- 24
- Messages
- 6,070
- Reaction score
- 8,015
- Location
- Virginia
- Vehicles
- 2021 MME GT, Jeep GC-L, VW Jetta
- Thread starter
- #1
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.
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.
I learned three things:
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.
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.
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.
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!
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.
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.
I learned three things:
- 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.
- 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.
- I could probably kill my HVBJB if I keep doing things like this. Just like @heisnuts did. Crazy man.
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.
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.
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.
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!