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10:37 AM
Morning
I have a question about measuring power... anyone been on a dyno?
so at the wheels, are the torque dependent of what gear you are in? it must be right?
 
 
2 hours later…
12:14 PM
@Markus yes, that’s why on a dyno pull, you’ll usually hear then hear them shift up to a ratio that’s close to 1:1 to make the math a little easier. You still have to correct for the final drive ratio but you’re less worried about losing precision.
You’ll also get a longer pull in that higher gear due to the reduced torque at the wheel. Longer measurement = somewhat better data post-smoothing
 
12:45 PM
Dynoing an electric car should be a little different then a usual car?
And especially a hybrid
So I'm looking at the Polestart 1, it is supposed to have 600hp and 1000Nm. However I'm a bit doubtful... the thing is that the engines individual max power ratings add up to a total of 608hp, but how likely is it that they all hit the max at the same rpm. (and at what gear) @BobCross
 
1:03 PM
I would expect an electric motor to have a mostly flat torque curve. Whether there’s any hearing options between that motor and the wheels is an open question.
Any combustion engine is going to have a more curvy torque curve so power at the wheels will vary with RPM. It sounds like you need more context on exactly what was tested and how. Can you force both power systems to be on at the same time?
 
1:25 PM
Both of the systems can be made to be on at the same time (or actually all three systems). The torque is not flat, it's flat in the beginning, then it reduces opposed to the rpms. So electric is better at low rpms while gasoline are better at high rpms. But as the electric motors drive the rear wheels and the petrol the front, it becomes a little strange, since the petrol has a gearbox, while the electric doesnt
 
 
1 hour later…
2:37 PM
It all sounds very interesting and complicated. Can you find a dyno chart online somewhere?
 
I have found some for the tesla, but they only have electric motors. But there is also a complication with the tesla... on the cars with two motors, the different motors also have different characteristics, so the front one have more torque in higher speeds
I haven't seen these in any dyno charts though
 
 
5 hours later…
7:16 PM
In today’s moment of madness, I gave some thought to leaving my job to become a full-time fletcher. No plan on how to pay the bills by putting feathers back on but, man, I could use some straightforward no-drama work! 🏹
 
 
1 hour later…
8:35 PM
@BobCross Strange coincidence, just today I said to my colleague that I'd rather earn money as a lumberjack than bothering with HTML and JavaScript
 
9:20 PM
You chop down the wood, I'll hold them off!
 

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