So, first of all thanks to those who will want to read this long text, and thanks also to those who will not read it who will live well anyway
Obviously we are talking about tsdz2 and its limitations. It would be interesting if others put their experiences.
Let's start from the environment in which I live which is one of the factors (together with the weight of the cyclist), which conditions the use of the engine.
I live in the hills, hills more or less 300mt high, with gentle climbs but also points where you tip backwards.
The asphalted roads obviously follow the gentler slopes, rarely exceed 10-12% and to climb from the bottom of the valley to the top of the hill there are 5-6km of uphill.
There is a dense network of dirt roads, which I have not seen in other areas of Italy, a real labyrinth of narrow streets. These allow you to go up from the oval (if you know them obvious) in about half of the km, obviously with much more important slopes than asphalted roads, 15% is normal. There are also roads that go up even more but they are almost all abandoned as the slope was such that it was difficult to keep the bottom good, it is easily washed away by the rain and since there are easier alternatives they are now reduced to paths.
Let's say that it is the paradise of XC understood as a mtb discipline that is not extreme like enduro but more cross county.
I have owned the tsdz2 (a 36v) since spring 2017 and literally hated it at first. I tried everything, even supercharging it with a step up but nothing, the type of delivery literally broke my legs, so much so that I was told that "the torsiometers were not for me".
Then in September 2018 I did 2 things, I bought a turbo Levo, and more or less at the same time I put the Casahino firmware on the tsdz2, in version 06 I think, it didn't even mark the km on the speedometer, it was so rough.
The turbo Levo made me understand that the torsiometers are not all like those of the original tsdz2, because I was fine with that.
The new software made the tsdz2 look exactly like the turbo Levo, just a little less watts of power.
In January 2019 I took a second tsdz2, this time at 48v, because if the 36v was ALMOST like the levo, probably the 48v at least equaled it. And indeed it was, there is very little difference between the two engines.
The leverage has above all an advantage. You can pull a lot more without the engine breaking (not entirely true, given that after a year and 3 months the belt has blown, but the engine practically never exceeds 65 °, not even scrambling it).
Since I had a long series of hubs that i have burned on the streets indicated above (one lasted 3 days
but it went like a beast
) To avoid problems with the new tsdz2 I put a simple digital thermometer, tied above the metal part of the engine, no digital connections with the control unit, I just needed to see at what temperature the engine was getting.
So the experiments started, and a bit of depression
On the streets reduced to paths I mentioned above, with climbs above 15%, the engine reached 104-105 °, in just one km
, outside temperature around 20 °
I took a road that was still open, a normal country road and I chose it as the «test road», it has nothing exceptional, only it is 2.1 km long and it is close to home. It is a "wave" road that rises to 15% for 200mt, then a 500m 3-4% of rise, a rise that reaches 17% for another 5-600mt, another 300mt almost flat and then the last start of 100mt at 6-7%. Nothing extremely exaggerated, it is open to traffic, full of holes but cars (very rare) pass by.
On this road the tsdz2, WITHOUT PAD, reaches 93-95 °
You can understand that both examples are too much for the engine. Also because similar routes I do them EVERY DAY for an hour a day.
So I was pretty depressed.
At the same time I tried to do some sprint on an asphalted road, where the slopes are much milder. Well, if you want to sprint on a 5-6% climb, engine at maximum, it takes less than one km to bring the engine above 100 °.
So with this engine in original condition, only firmware changed, you can't even sprint one kilometer, almost without going on fire
Imagine that I had learned to hear the engine when it went above 80 ° from the noise change
Someone will remember that I put a fan piercing the crankcase, then some copper fins, with huge holes in the crankcase ...
Now maybe you understand why ... what was I doing with an engine that heats up like that? You can limit it to 250w ... Maybe for someone it could be fine, but in my environment it means not to go up. It is also unacceptable ... a simple supermarket hub, if you start at the highest level it goes to 500w and on the road it keeps them very well I assure you ... Then luckily came the idea (not mine) of the thermal pads and it was a turning point.
For my road trips I set the watts at 380 and the engine does not exceed 50 ° even to go up for half an hour continuously. In winter it is difficult even to reach 40 ° ...
In the summer it rises a little more but remains very acceptable.
The test climb of 2.1 km does it at 67 °, the trail does not reach 80 ° ...
Quietly holds 5-600w for ten minutes continuously, without going above 80 °.
I have been going on for more than a year in these conditions which are very good for my paths ....
This is why I get angry when I am told that "the new firmware heats up because it is taken beyond the limits"
but if I have been around for more than a year with the above data! Which limits are exceeded? The limits as you can understand, I studied them very well, on pain of not being able to use the engine.
Unfortunately (this is not meant to be a criticism of mbrusa's work, which I thank very much, but an observation) as soon as I put the new software everything was fine except the temperature ... in the first laps I passed over it but then using it I saw impossible temperatures and I had to say ...
On the test climb it goes to 93 °, with less than 15 ° outside temperature. With the old 67° ....
Mbrusa, I'm not talking little, here we are dealing with the motor with the pads, which means carrying a block of aluminum and iron of 3 kg, in addition it touches an aluminum frame, on the outside to a heat that immediately burns hands.
That's why I raised the alarm. What happens if a user without a pad goes there to the mountains? if with the pads it reaches 90-100 ° what happens without the pad? For me it burns immediately, maybe it doesn't weigh 104kg and it doesn't burn in spring but it catches fire in 2 months.
Attention I do not pretend that these are absolute truths. I can have something wrong in the parameters (but I have not changed anything) the only thing I ask you is to CHECK to avoid possible problems. And if there are no matches the same as mine and I did something wrong, I'm the first to be happy!