Rear diff ratios with GS450h
- PatrcioEV-ATX
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Rear diff ratios with GS450h
For those running a GS450h transmission, what are your rear differential ratios? Mine is 2.73 and I'm thinking of something in the high 3's to get more low speed torque.
1998 Ford ZX2 - DC EV conversion(sold) http://evalbum.com/2093
2012 Nissan Leaf (sold)
2016 Mercedes B250e (sold)
2023 Volvo C40
Current: 1964 Rambler Classic 660 w/ GS450h set up. 36kwh Tesla batteries from B250e.
https://www.instagram.com/rambler_660e/
2012 Nissan Leaf (sold)
2016 Mercedes B250e (sold)
2023 Volvo C40
Current: 1964 Rambler Classic 660 w/ GS450h set up. 36kwh Tesla batteries from B250e.
https://www.instagram.com/rambler_660e/
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Re: Rear diff ratios with GS450h
Mine has 3.38 with tire circumference 220cm and I would not get any higher for daily driven, perhaps even lower for economy on higher speeds. Personally I would look into gear change code, it would give great low speed torque while keeping good economy on higher speeds. In my case theoretically keeping both MG max revs under 11k I could do 92km/h on low gear.
Re: Rear diff ratios with GS450h
I would work out your motor rpms at your maximum vehicle speed - then work back to see if you have headroom to increase the diff ratio and keep within the max motor rpm?PatrcioEV-ATX wrote: ↑Mon Jul 24, 2023 1:14 pm For those running a GS450h transmission, what are your rear differential ratios? Mine is 2.73 and I'm thinking of something in the high 3's to get more low speed torque.
- PatrcioEV-ATX
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Re: Rear diff ratios with GS450h
No worries at all on that. I've already done the math and as built, I have way more top speed than I'll ever see.
1998 Ford ZX2 - DC EV conversion(sold) http://evalbum.com/2093
2012 Nissan Leaf (sold)
2016 Mercedes B250e (sold)
2023 Volvo C40
Current: 1964 Rambler Classic 660 w/ GS450h set up. 36kwh Tesla batteries from B250e.
https://www.instagram.com/rambler_660e/
2012 Nissan Leaf (sold)
2016 Mercedes B250e (sold)
2023 Volvo C40
Current: 1964 Rambler Classic 660 w/ GS450h set up. 36kwh Tesla batteries from B250e.
https://www.instagram.com/rambler_660e/
- PatrcioEV-ATX
- Posts: 184
- Joined: Sun Dec 13, 2020 5:25 pm
- Location: Austin, TX, USA
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Re: Rear diff ratios with GS450h
I can change the gear manually with the computer, and have done so, but it doesn't really change my low end torque. I can see the PB settings change and am 90% positive it is actually switching from high to low, but not much difference in feel.evMacGyver wrote: ↑Tue Jul 25, 2023 5:48 am Mine has 3.38 with tire circumference 220cm and I would not get any higher for daily driven, perhaps even lower for economy on higher speeds. Personally I would look into gear change code, it would give great low speed torque while keeping good economy on higher speeds. In my case theoretically keeping both MG max revs under 11k I could do 92km/h on low gear.
1998 Ford ZX2 - DC EV conversion(sold) http://evalbum.com/2093
2012 Nissan Leaf (sold)
2016 Mercedes B250e (sold)
2023 Volvo C40
Current: 1964 Rambler Classic 660 w/ GS450h set up. 36kwh Tesla batteries from B250e.
https://www.instagram.com/rambler_660e/
2012 Nissan Leaf (sold)
2016 Mercedes B250e (sold)
2023 Volvo C40
Current: 1964 Rambler Classic 660 w/ GS450h set up. 36kwh Tesla batteries from B250e.
https://www.instagram.com/rambler_660e/
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- Posts: 111
- Joined: Tue Jun 15, 2021 5:44 pm
- Location: Finland
- Has thanked: 21 times
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Re: Rear diff ratios with GS450h
Then it's that remaining 10%.. because you will feel the difference for sure - car acceleration transforms to a jet planePatrcioEV-ATX wrote: ↑Tue Jul 25, 2023 12:54 pm am 90% positive it is actually switching from high to low, but not much difference in feel.
Really, there is something wrong. I have MG2 speed on speedometer and I normally use only high gear, with that 40km/h is ~1900rpm. On low gear 40km/h is about double ~3900rpm.
And for solenoid problems, when I switch to low gear, it does work, but there is quite loud ticking sound. That sound is there with or without oil pump running. Maybe some day I'll test which solenoid it is and perhaps try to swap it from spare transmission.
If gear change would be automatic and smooth under power, it would be really nice. Acceleration on low gear and efficient drive on high gear.
Anyway, as gs450h constant torque is up to somewhere around 4500-5000rpm, for daily driven I would choose diff ratio so that normal maximum road speed is around that. For me 5000rpm is around 100km/h, 6000rpm is slightly over 120km/h, which is maximum road speed in Finland, but where I rarely drive. And low gear would give awesome low speed acceleration.
- PatrcioEV-ATX
- Posts: 184
- Joined: Sun Dec 13, 2020 5:25 pm
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Re: Rear diff ratios with GS450h
I did a drive test and there is no change in RPM at the same speeds between H and L, so it's definitely not changing gears. In H, my PBs read Off, On, Off. In L, they all read On. Oddly, I usually have my oil pump set at 35%. When I switch to L, it sounds like it shuts off. I then set it to 50% and when I switched to L it slows down but keep running. Changing between H and L in the VCU changes the oil pump speed? There's definitely no code to do that.evMacGyver wrote: ↑Tue Jul 25, 2023 7:03 pm Then it's that remaining 10%.. because you will feel the difference for sure - car acceleration transforms to a jet plane
Really, there is something wrong. I have MG2 speed on speedometer and I normally use only high gear, with that 40km/h is ~1900rpm. On low gear 40km/h is about double ~3900rpm.
And for solenoid problems, when I switch to low gear, it does work, but there is quite loud ticking sound. That sound is there with or without oil pump running. Maybe some day I'll test which solenoid it is and perhaps try to swap it from spare transmission.
If gear change would be automatic and smooth under power, it would be really nice. Acceleration on low gear and efficient drive on high gear.
Anyway, as gs450h constant torque is up to somewhere around 4500-5000rpm, for daily driven I would choose diff ratio so that normal maximum road speed is around that. For me 5000rpm is around 100km/h, 6000rpm is slightly over 120km/h, which is maximum road speed in Finland, but where I rarely drive. And low gear would give awesome low speed acceleration.
1998 Ford ZX2 - DC EV conversion(sold) http://evalbum.com/2093
2012 Nissan Leaf (sold)
2016 Mercedes B250e (sold)
2023 Volvo C40
Current: 1964 Rambler Classic 660 w/ GS450h set up. 36kwh Tesla batteries from B250e.
https://www.instagram.com/rambler_660e/
2012 Nissan Leaf (sold)
2016 Mercedes B250e (sold)
2023 Volvo C40
Current: 1964 Rambler Classic 660 w/ GS450h set up. 36kwh Tesla batteries from B250e.
https://www.instagram.com/rambler_660e/