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Discussion Starter · #1 ·
What makes up the driveline / drivetrain of the GM electric vehicles already in production or pre-production? Are there differentials between the electric motor(s) and the wheels? If so what type? (locker, posi. open) I assume half shafts also? In the case of AWD are both front wheels driven all the time when additional power is required or only one? How is power directed to each set of driven wheels and at what sort of ratio?
 

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I am not sure I have the mechanical background to answer your question but as no one has attempted I will give it a shot. If you are asking if different power ratios are provided to each of the front wheels and similarly with the rear wheels by a single motor, then I believe the answer is no. I think this would involve some sort of torque vectoring that as far as we know is not available on the Blazer EV.
 

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Discussion Starter · #3 ·
I am not sure I have the mechanical background to answer your question but as no one has attempted I will give it a shot. If you are asking if different power ratios are provided to each of the front wheels and similarly with the rear wheels by a single motor, then I believe the answer is no. I think this would involve some sort of torque vectoring that as far as we know is not available on the Blazer EV.
Thanks, good to see someone taking a shot at the question. I guess in general terms I was wondering if (among the other questions asked) if all wheel drive really is / was possible in an electric vehicle? Just like the hype you see plastered all over trucks (4 X 4) and when you ask about if the rear diff. on it is open, a posi, or a locker, and you know that most trucks do not have a similar locking front diff. it make that vehicle a 2 wheel drive not 4.
 

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The only EVs I know of with true AWD is the quad motor Rivians. One motor per wheel. The Fisker Ocean, as well as the upcoming Polestar 3 I believe will offer the torque vectoring which will increase or decrease the torque of each wheel as needed.
 

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The Ultium vehicles all have a combination of three possible motors. A 255KW, 180KW permanent magnet motor and a 62KW induction motor. In some applications motors will be joined together.

In the Blazer EV FWD will use the 180KW electric motor.
Blazer EV eAWD will use the 180KW motor front and 62KW motor rear
Blazer EV RWD will use the 255KW motor rear
Blazer EV SS AWD uses the 180KW motor front and 255KW motor rear.

The motors are placed directly on the drive line and half shafts come directly out of the motor to the wheels. The half shafts are connected using a single gear reduction and it operates in an open differential configuration.

There are some exceptions. The Hummer EV (Edition 1) uses two 255KW motors in the rear that can be linked to operate like a locking differential. It also has a single 255KW motor up front that does have a locking capability.

Silverado EV and Sierra EV Denali Edition 1 and Celestiq will use a 255KW motor up front and 255KW motor rear.
Lyriq uses 255KW motor rear with 11.63:1 reduction and AWD is 180KW front and 255KW rear.
 

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The Ultium vehicles all have a combination of three possible motors. A 255KW, 180KW permanent magnet motor and a 62KW induction motor. In some applications motors will be joined together. In the Blazer EV FWD will use the 180KW electric motor. Blazer EV eAWD will use the 180KW motor front and 62KW motor rear Blazer EV RWD will use the 255KW motor rear Blazer EV SS AWD uses the 180KW motor front and 255KW motor rear. The motors are placed directly on the drive line and half shafts come directly out of the motor to the wheels. The half shafts are connected using a single gear reduction and it operates in an open differential configuration. There are some exceptions. The Hummer EV (Edition 1) uses two 255KW motors in the rear that can be linked to operate like a locking differential. It also has a single 255KW motor up front that does have a locking capability. Silverado EV and Sierra EV Denali Edition 1 and Celestiq will use a 255KW motor up front and 255KW motor rear. Lyriq uses 255KW motor rear with 11.63:1 reduction and AWD is 180KW front and 255KW rear.
This is some fantastic information thanks for sharing. Although, I am hopeful the AWD configuration for the Blazer uses the larger 255KW rear motor and puts the 62KW motor up front. The press materials simply call the 62KW motor the all-wheel drive assist motor. The configuration you list for AWD is known to be for the Equinox EV and that would make it less powerful than the RWD blazer which would be a shame. Additionally we know the RWD comes with the largest pack and the FWD will come with the medium or small pack. I hope the AWD comes with the largest pack, we know it fits in the SS.
 

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This is some fantastic information thanks for sharing. Although, I am hopeful the AWD configuration for the Blazer uses the larger 255KW rear motor and puts the 62KW motor up front. The press materials simply call the 62KW motor the all-wheel drive assist motor. The configuration you list for AWD is known to be for the Equinox EV and that would make it less powerful than the RWD blazer which would be a shame. Additionally we know the RWD comes with the largest pack and the FWD will come with the medium or small pack. I hope the AWD comes with the largest pack, we know it fits in the SS.
Welcome to the forum. Since the 255KW is said to produce 342 hp, I think what you said about the front/rear powertrain configuration will happen. But do you think it will be with an AWD model that isn't performance related like the RS?
 

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Welcome to the forum. Since the 255KW is said to produce 342 hp, I think what you said about the front/rear powertrain configuration will happen. But do you think it will be with an AWD model that isn't performance related like the RS?
I was just listening to a video with one of the engineers on TFLEVand it seems like possibly the AWD will have less power than the RWD. It was still confusing as to the arrangement of the motors, but he did say "we put a bigger motor in the rear" indicating the RWD motor will be bigger than either of the AWD motors used in the LT or RS trims. Also he said they put a bigger battery pack in the RWD indicating the AWD would only get the medium battery pack. For me the perfect car would be and AWD RS with the 62KW motor up front (to keep it RWD biased since the small motor is only used when needed) and either of the other motors in back would be adequate, but the larger motor would be best. Also I would want the large battery pack. I hate the interior colors on the SS and I don't need all that power. But I doubt my ideal configuration will ever be realized.
 

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I was just listening to a video with one of the engineers on TFLEVand it seems like possibly the AWD will have less power than the RWD. It was still confusing as to the arrangement of the motors, but he did say "we put a bigger motor in the rear" indicating the RWD motor will be bigger than either of the AWD motors used in the LT or RS trims. Also he said they put a bigger battery pack in the RWD indicating the AWD would only get the medium battery pack. For me the perfect car would be and AWD RS with the 62KW motor up front (to keep it RWD biased since the small motor is only used when needed) and either of the other motors in back would be adequate, but the larger motor would be best. Also I would want the large battery pack. I hate the interior colors on the SS and I don't need all that power. But I doubt my ideal configuration will ever be realized.
Since that's your ideal spec, would you still go with an AWD RS if that isn't the exact motor configuration?
 

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Since that's your ideal spec, would you still go with an AWD RS if that isn't the exact motor configuration?
I guess that's the problem with saying the platform is highly configurable. It sets up a lot of possible combinations and everyone is going to have a preference. But I understand there are logistical constraints to manufacturing and they might not want to invest in a front subframe to hold the 62KW motor. As it stands we know the FWD and SS AWD front will have the 180KW motor. The RWD and SS AWD rear will have the 255KW motor in the rear. If they were to build it in my ideal configuration they would have to only have to develop a front subframe for the 62kw motor and use the 255KW in the rear. But if they put the 180KW motor in back it would be another rear subframe they would have to develop. Additionally it is possible that the rear subframe is shared with the equinox on which case they have already developed a rear with the 62KW motor. So it makes sense the cheapest way to get the AWD is the 180KW up front and the 62KW in back. I guess that's a long way of saying I'll just have to wait and see what is available lol.
 
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