Reduction Gear Ratio, 2022 ZS

[BRT]

I am using a 2022 year ZS motor in a different vehicle, and need to know the overall ratio of the reduction gear, from motor to output shaft.
I haven't been able to find this info anywhere, but someone must know!
Can anyone help?
Thanks

 

[DB Go Rex]

I am using a 2022 year ZS motor in a different vehicle, and need to know the overall ratio of the reduction gear, from motor to output shaft.
I haven't been able to find this info anywhere, but someone must know!
Can anyone help?
Thanks

If you have one on hand (that you are using) can you not calculate it from the number of teeth on the output shaft to the number of teeth on the drive gear?

 

[Coulomb]

There is a tachometer in one of the menus (at least the Mark 1 does), so some kind soul could calculate it, at least approximately.

 

[BRT]

Thanks for the replies!
Counting teeth would certainly give the answer, but I don't really want to dismantle the thing just for that.

 

[Stumacher]

I did dismantle it just to do this. I think the number you are looking for is 7.761 if your car is the same as mine - 2021 MG ZS EV
All your answers are in this video

 

[DB Go Rex]

I did dismantle it just to do this. I think the number you are looking for is 7.761 if your car is the same as mine - 2021 MG ZS EV
All your answers are in this video

Interesting video.

It's great how simplistic the drivetrain is on EVs. As long as the core components are decent, it all bodes well for long term reliability Vs ICE cars.

 

[BRT]

The 2022 reduction gearbox I have is different to the 2021 version in the video from Stumacher.
The 2022 has the diff and output shaft concentric with the motor, with the drive shaft to one wheel passing inside the motor shaft.
However I have been working with an estimated red. ratio of 8 so not too far off the 2021.
But I'd still like to know the actual ratio!

 

[Stumacher]

The 2022 reduction gearbox I have is different to the 2021 version in the video from Stumacher.
The 2022 has the diff and output shaft concentric with the motor, with the drive shaft to one wheel passing inside the motor shaft.
However I have been working with an estimated red. ratio of 8 so not too far off the 2021.
But I'd still like to know the actual ratio!

Ah that's a shame. But I had a look around and found this in the MY22 Principles and Functions Manual. MY22 ZS EV
1st gear 3.957
Final drive ratio 2.414
Therefore combined ratio 9.552. So a shorter ratio than mine (numerically higher) but your motor revs higher than my MY21. Mine is 10,000rpm max, yours is 8,000 "rated" and 15,000. Also your max torque is 280Nm, so car should be brisker off the mark than mine. Nonetheless, we'll see how brisk my Porsche 928 with MG power will be. The biggest surprise is - everyone talks about how heavy EVs are. My Porsche 928 EV8 should be considerably lighter than the petrol equivalent.

 

[BRT]

Thanks!
I am doing a conversion similar to yours, into a Rover P6. The motor will go in the back replacing the diff pretty much the same as your Porsche. I've been learning things from your video series, very useful.

 

[Stumacher]

Thanks!
I am doing a conversion similar to yours, into a Rover P6. The motor will go in the back replacing the diff pretty much the same as your Porsche. I've been learning things from your video series, very useful.

Great choice. My mum loved her Rover 2000 and I learned to drive on it. While on an interstate trip I hit a giant kangaroo (a glancing blow, both Rover and Skippy OK) and had to apologise to mum on my return. Stay in touch!

 

[pollenface]

everyone talks about how heavy EVs are

While they're unloading on you everything that's wrong with EVs?

 

[Stumacher]

While they're unloading on you everything that's wrong with EVs?

Weight is just one of the many "but what about..." knee jerk responses some anti-EV people come up with. I recently reviewed the IONIQ 5N which weighs 2.3 tonnes. You'd never know. Drove like a sports car. Absolute weapon in a straight line and in the bends. But I digress. This is a MG ZS EV forum. Clearly I like EVs. I'm turning a Porsche V8 into an EV.

 

[pollenface]

I'm turning a Porsche V8 into an EV.

wow that's pretty cool