Rear diff ratios with GS450h

[PatrcioEV-ATX]

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.

[evMacGyver]

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.

[SuperV8]

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.

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]

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?

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.

[PatrcioEV-ATX]

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.

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]

am 90% positive it is actually switching from high to low, but not much difference in feel.

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.

[PatrcioEV-ATX]

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.

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.