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Reports of slower accelleration after latest update.
- Thread starter slipnslider
- Start date
Bartman1
Member
Well to be fair, Elon Musk did say "At Tesla we don't make slow cars".......but remember he never said anything about not slowing them down AFTER they were made....
Oh no, now we need to go into (very simple) physics to explain power, force and torque. I‘ll try to keep it simple.
If you have a car accelerating at a constant rate you need a constant force. Force times speed is power, so at constant acceleration the power has to increase linearly.
Torque is Force times the lever arm. In this case the wheel plus some gearing in between. But since the lever arm, the gearing and the Force are constant, torque is also constant.
Sine Power is also Torque times the angular velocity, which again increases linear with speed, a linear increase in power over speed means constant torque.
In case it was not clear, my post was supposed to be a joke!!
Meaning there is really nothing for Bartman1 to apologize. It was actually funny.
phigment
Member
Do you see faster accelleration with a slow push or a rapid stomp?
Maybe they're trying to mitigate 'unexpected accelleration' when people think they are stomping on the brakes.
Because your initial acceleration is higher, so the change in force is higher. It's a subway starting to move, your body isn't prepared to counter the force, so it throws you back.
You body deals with 1g every single day, but since gravity doesn't change, you don't notice it. Add in a sudden 0.4g and you won't be able to contract your core and neck muscles quickly enough. Build that force more slowly and your body will react with a counter force.
Right I understand this, however I’m simply pointing out that literally kicking the pedal hard provides a much bigger punch compared to quickly pushing the pedal to the floor. Maybe this was part of that update people are reporting changed the acceleration characteristics.
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So no jamming the pedal into the floor... Just quicker to go from 0 to fully pressed in?
Either method had the same amount of pedal travel, right? (All the way to fully pressed in), you are just saying quick vs very quick on the press down...?
Either method had the same amount of pedal travel, right? (All the way to fully pressed in), you are just saying quick vs very quick on the press down...?
I'm not discounting the experience of any of the Model 3 owners, but I was having similar thoughts when reading this thread.
When I got the P85 in 2012, it felt "borderline unsafe" quick. In 2015, I upgraded to P85D which later upgraded to get Ludicrous; it too felt "borderline unsafe" quick for a bit. I now have a P100D which felt "borderline unsafe" again, for a bit. Now, when I offer rides to show people Ludicrous in the P100D I don't feel nearly the same rush.
In short, driver acclimation is definitely a thing.
There is definitely a difference in press vs. stomp in the Model S, so I expected the same in the 3.
There is a linear acceleration of power or constant torque for the first several seconds at full throttle. I just assumed that at 90% throttle you’d be at 90% of max torque. Also that at a gradual linear push to 100% throttle you’d have a gradual increase in power and the corresponding curve of torque increase. It would be interesting for someone with CANBus gear to test as CANBus tracks percentage of petal press at 100 Hz.
For what it's worth. We have a local event coming up near me at a tuner where we will be testing all different Tesla's on an unlinked AWD dyno. We have already done a test with a 75D Model S and we got nice readings on both HP and Tq. There should be a couple of Model 3's at the event including mine. We should get a lot of data on how and when the car puts out power. If anyone in the North East is interested here is a link to the event Supercharged Sunday.
No throttle map in the world does 90% output for 90% input. Most new gasoline cars are approaching binary response. Source: have flattened throttle maps on Denso ECU's.
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