Drive Cycle With Front Wheels Jacked Up

[abscate]

Hello again,

I was just thinking that with the FWD front wheels turning to simulate a drive cycle (jacked up) the back wheels will not be turing at all. So the question comes up, can the computer sense that the back wheels are not turning?

Thanks.

It can via the wheel sensors. No idea of implications for readiness , though

[454cid]

For the record, "driving" the car on jack stands does not sound safe to me. If the vibration were to allow the car to fall, you'd launch forward. When cars are run on a dyno, they're restrained with heavy straps, and a huge fan sits in front of the grill providing air flow. The proposed scenario doesn't load the car like a dyno would so it's not exactly the same, but still sounds sketchy to me.

[Clemens]

For the record, "driving" the car on jack stands does not sound safe to me. If the vibration were to allow the car to fall, you'd launch forward. When cars are run on a dyno, they're restrained with heavy straps, and a huge fan sits in front of the grill providing air flow. The proposed scenario doesn't load the car like a dyno would so it's not exactly the same, but still sounds sketchy to me.

There was a movie where a few kids drove one dad's Ferrari and then wanted to rewind the mileage by running it in reverse while jacked up. It ended up darting through the glass walls of the garage that was a few feet above the ground.

[454cid]

For the record, "driving" the car on jack stands does not sound safe to me. If the vibration were to allow the car to fall, you'd launch forward. When cars are run on a dyno, they're restrained with heavy straps, and a huge fan sits in front of the grill providing air flow. The proposed scenario doesn't load the car like a dyno would so it's not exactly the same, but still sounds sketchy to me.

There was a movie where a few kids drove one dad's Ferrari and then wanted to rewind the mileage by running it in reverse while jacked up. It ended up darting through the glass walls of the garage that was a few feet above the ground.

I believe that was Ferris Bueller's Day Off.

[abscate]

If it falls off the jackstands running it will just stall. Energy in the rotating wheels is tiny compared to a MegaJoule of 100 KMh car

[MrAl]

For the record, "driving" the car on jack stands does not sound safe to me. If the vibration were to allow the car to fall, you'd launch forward. When cars are run on a dyno, they're restrained with heavy straps, and a huge fan sits in front of the grill providing air flow. The proposed scenario doesn't load the car like a dyno would so it's not exactly the same, but still sounds sketchy to me.

There was a movie where a few kids drove one dad's Ferrari and then wanted to rewind the mileage by running it in reverse while jacked up. It ended up darting through the glass walls of the garage that was a few feet above the ground.

Ferris Buellers Day Off. Pretty cool movie.

Yes i was worried about that also. I would of course have taken precautions.

[MrAl]

For the record, "driving" the car on jack stands does not sound safe to me. If the vibration were to allow the car to fall, you'd launch forward. When cars are run on a dyno, they're restrained with heavy straps, and a huge fan sits in front of the grill providing air flow. The proposed scenario doesn't load the car like a dyno would so it's not exactly the same, but still sounds sketchy to me.

Hi,

Yes you are right, i have second thoughts about it too that's why i was asking.
Too many things could go wrong and the computer may not like it anyway.

[MrAl]

Hello again,

I was just thinking that with the FWD front wheels turning to simulate a drive cycle (jacked up) the back wheels will not be turing at all. So the question comes up, can the computer sense that the back wheels are not turning?

Thanks.

It can via the wheel sensors. No idea of implications for readiness , though

Hi,

Yeah too many unknowns in this idea i was hoping someone tried it already. I cant take the chance something will go wrong.

Oh a semi related note, yesterday i rode in a Tesla X Performance with "gull wing" doors. Amazing car all electric.
The gull wing doors are not exactly gull wing Tesla calls them "Falcon Wing" because unlike other similar doors they pivot in wo places instead of just one. The extra pivot is to allow the doors to open in tight parking spaces. The doors have sensors too so they can detect obstacles and change which pivot pivots more. The door are electric so they open with the push of a button. It's amazing just to see one open up.
Price tag $82000 to $130000 USD this one was toward the upper end of that price range.
Rides about the same as a regular gas car dont notice any difference but the car itself looks really awesome.
Charging stations are a bit of a problem though in this state. Not that many around and the ones that are around are not very well taken care of. Cables lying on the ground thrown all about. One station near me (about 2 miles) has a charger but does not work and it's been like that for the past two years. Not that motivation i guess to get the stations going.
In California (i visit now and then) some of the stations have the cables cut and the wires (large weight copper) are not even stolen. It's like someone or some group is trying to prevent the proliferation of electric vehicles. Some cables are stolen though.
I guess for my self i am divided on the widespread use of electric vehicles mainly because of the charging requirements there are some serious issues. The main one is peak power during the charge process. People dont want to wait 6 hours to charge their battery they want it fast, and at a charging station they can do it in around 1/2 hour. But due to the size of the batteries, it takes a very large peak electric power to charge that fast. I havent run the numbers yet, but i think it is equivalent to about half a house total electric input power with lots of appliances turned on. If there are several chargers at one station, that could mean it takes the power equivalent to several normal households in a small real estate area. With the power grid in this country being what it is, old and not very good, i see a problem coming up as more and more electric vehicles are sold and operated. The grid has to be updated. This has been talked about many times by the current administration but i dont see anything done yet on infrastructure. In California they are already predicting rolling blackouts.
I guess time will tell as this relatively new technology evolves.
One thing is undeniable though, those Tesla cars are amazingly amazing
Oh, and one important feature: No OBDII because there are no emissions!

[abscate]

In the era of the advent of the horseless carriage, the naysayers wondered how we would distribute all this gasoline to waiting tanks. Disruptive technologies change many things, not just the direct impact.

Hybrids are the sweet spot right now , with an XC90 with a 50 mile range perfect for weekly commute, charge once on weekend, and a t4 for cruising distances

All electric for 130k? That will pay back in only 20 years of saved gas!

[kallekula]

One of my friends bought the Tesla Y with “dual motor“. Holy crap that car moved. Think 0-60 was 3.6 secs. My wife is looking at the new mustang SUV. It has about similar power. Can’t wait to drive the crap out of it