Very Mild Hybrid

[cRiPpLe_rOoStEr]

Sure. Either this, or having to resort to oversized hub motors in order to reach the same performance figure.

[Simon TT]

Originally Posted by JSH

Something to consider when choosing between hub motors and frame mounted motors is the very large difference in axle torque.

With a hub motor the rated torque is also the axle torque. With a frame mounted motor the motor torque is multiplied by the gear reduction ratio which is generally 3 to 5 times.

A 100 Nm hub motor puts 100 Nm to the rear axle. A 100 Nm mid-drive motor puts 300 to 500 Nm to the rear axle.

That is why bicycles and motorcycles with hub motors are generally much slower to accelerate than a vehicle with the same size frame mounted motor.

Sure, but since my ICE only has 110Nm and I don't want a full hybrid pretty much any motor should have enough torque

[Simon TT]

I just saw this video (YouTube: b Sport Valkyrie 3(I can't post links)) about the Aston Martin Valkyrie, it also uses an automated sequential manual transmission and an electric motor inside it wich does exactly what I had in mind: it is used for low speed driving, as reverse, to smooth the shifts, to start the engine and for recuperation.

I don't exact know the internals of my gearbox, but replacing the reverse gear with a motor should be possible, if not I could mount the motor externally

[Piotrsko]

Probably easier to get a transfer case used in 4wheel drive systems and add a motor to that. Plus you get an additional lower series of gears.

[Simon TT]

How do you want to place this? Gearbox-Transfer Case-Diff-Driveshafts? because the Diff is integrated into the gearbox. Gearbox-Diff-Transfer Case- Driveshafts seems very difficult

[cRiPpLe_rOoStEr]

Originally Posted by Simon TT

I don't exact know the internals of my gearbox, but replacing the reverse gear with a motor should be possible, if not I could mount the motor externally

I'm well aware of some replicas of the Lotus 7 fitted with motorcycle engines resorting to an auxiliary electric motor only to provide reversing, not being a hybrid at all. Maybe you could remove the reverse gear from the stock transmission of your car, which I wouldn't recommend, but I don't believe replacing it with an electric motor right inside the transmission case would be any easy.

[bwilson4web]

Recently I bought a second EV, a BMW i3-REx, so I could work on my Tesla Model 3 when something might take more than a day:

• 2017 BMW i3-REx
• $15,000 (add taxes and fees)
• 57,000 mi (battery warranty 60,000 mi or 8 years)
• 27 kWh (28.3 kWh new)
• Fixed gear, no transmission
• 106 mi range at @65 mph
• 88 mi range on mid-grade gas @65 mph

It is an EV around to and from the nearest towns with highway privileges, ~36 MPG. Cross country is like a motorcycle with stopping every ~1.5 hours to top off the 2.3 gallon tank and drain the used coffee. Enclosed, there is no helmet, bugs, rain, cold, or heat in a comfortable four seater.

It is very hard to retro-fit any kind of EV drive into an ICE car. The body structure is wrong and inserting a 'power assist' has no friendly power take-off or add-shaft interface. The alternator/motor systems have been a mess and you're adding parts that always reduces reliability.

Bob Wilson

[freebeard]

How often does the Tesla need work?

It is very hard to retro-fit any kind of EV drive into an ICE car.

It depends. VW Beetle, Porshe 914, 356, 911 are popular choices.

[bwilson4web]

Remember mine is over 4 years and 115,000 miles:

• Windshield and roof glass from pebbles thrown up or dropped from trucks.
• Passenger side wheel bearings from hitting curb.
• Front bottom from parking curb scrapes.
• Bottom rear cover from road debris
• 12 V battery wore out.
• OEM tires wore out
• Added 2” receiver hitch
• Unseen post while parking
• One cabin filter replacement
• Most frequent, window washing fluid

My cars work for me and most of these were wear and tear from working hard. My previous Prius had similar maintenance plus Spring/Fall oil changes, annual engine filter, two transmission oil drain and fill, failed attempt to replace brake booster after 260,000 miles.

An EV is a car body encapsulation of a near maintenance free electric drivetrain.

Bob Wilson

[Tahoe_Hybrid]

Originally Posted by cRiPpLe_rOoStEr

Keeping an eye for some wrecked Fiat or Jeep with a mild-hybrid version of that 3-cyl 1.0L GSE engine and swap it into your car could serve you quite well.

might as well go with GM's option a v8 engine 6.0L LS2 engine with it's in transmission EV motor..

it would still do 40-45mpg in a car..

the best i was able to do was 32mpg.. 100% stock