Gregski wrote: ↑Tue Apr 28, 2026 2:52 am The Greg did not even skip a beat...

Lucky we're open source or you might be running into copyright issues with Damien there.

That wouldn't engage the clutches in the two speed gear as there'd be no pressure until moving and there'd be no drive w/o pressure so this would only work with the 2-speed gear locked (as I suggested above).

A further revision is that there would still be drive to the output shaft, directly ...

I have a question arising from this teardown:
As we're putting the battery connection directly into the inverter on the terminals behind the plastic cover, doesn't the existence of those thin busbars mean that the battery voltage is also applied to the DC-DC?
I thought, applying battery voltage ...

I have a question arising from this teardown:
As we're putting the battery connection directly into the inverter on the terminals behind the plastic cover, doesn't the existence of those thin busbars mean that the battery voltage is also applied to the DC-DC?
I thought, applying battery voltage ...

Gregski wrote: ↑Wed Apr 02, 2025 2:29 pm please post your ideas of what you would use this empty cavity for

Do you think you could hide a Zombie in there?
Or maybe just a bunch of relays and fuses for new conversion related circuits like EPS and brake pump etc.?

As far as making the oil pump useless is concerned, I don't see why, as it's designed to run at output shaft speed in the OEM setting and, if it were useless at that speed, what would be the point of it?
I guess it takes over pumping duty above a certain road speed.


I can see I made an error ...

Hello, Has anyone successfully installed the rear yoke of a 450h transmission onto a 300h transmission and can give me instructions? Thank.


Yes, I've just done that today. They're a straight fit; just undo the 29mm staked nut and lift off the yokes and they can be swapped either way.
Here are ...

image.png

PSD welded means that the input shaft (carrier), MG1 (sungear) and output shaft (ring gear) are locked together. So yes you lose the MG1 reduction, it would spin alot slower then MG2.

Yes the oil pump would de driven as it is geared to the carrier. Note you would thus now also be ...

QUESTIONS

Please feel free to shed some light on these if you have the answers or ideas, let's make this a collaborative effort.

Can I use the clutch plate off of a different Lexus model to lock the input shaft?

Can I run/drive the car on only MG2 or do I need to use both motors?
Yes, you ...

The GS450h transmission has been run without the oil pump but with some other tricks.

https://openinverter.org/forum/viewtopic.php?t=644&start=225

https://openinverter.org/forum/viewtopic.php?p=39923#p39923


Yes. Konstantin8818's approach (welded PSD and running MG1 'forwards') was my first ...

Ok. Moving forward. I now have a GS450h transmission, complete with pump and the inverter.
Although I have the oil pump, I'm still planning to see if I can find a way of running without it, for simplicity.

Having the pump means I should be able to trace the flow through the trans and see if the ...

jrbe wrote: ↑Tue Feb 06, 2024 4:51 pm The GS450h transmission has been run without the oil pump but with some other tricks.

viewtopic.php?t=644&start=225

viewtopic.php?p=39923#p39923

Thanks. The locked high ratio clutch with locked PSD is exactly what I had in mind.

What about something like an accusump to store oil pressure while driving? They make them with a solenoid to store the combustion engines oil pressure while the vehicle is off. Key on typically turns on the solenoid to send pressurized oil into the engine. You could potentially use something like ...

Jacobsmess wrote: ↑Sat Feb 03, 2024 1:45 pm Sounds like you might be best served using the IS300H/GS300H transmission

I had been considering this but there's still much discussion on the overall gearing issues and would rather use something proven.

This is for a Scimitar so it's a ladder chassis.

Oh, snap! I didn't think anyone else would be thinking of a Scimitar for conversion, let alone with a GS450h.
I don't have even the project car yet but going to view an SE5a tomorrow.
I see you have engine mounts coming so you must be quite far ...

Hi, I'm looking seriously at the GS450h for a next project
(currently working on something which uses all drive components from same source for simplicity).

The GS450h looks ideal for a RWD car BUT could some added complexities be taken out?
If the PSD is locked, then the internal pump would run ...