To some degree the inverters are taylored to the specs of motors they will be driving. Toyota don't use one design. The HS inverter is mid-range whereas the GS is a higher output drivetrain.
I would be weary of matching a lesser inverter to the L110 especially as your expectations are to run the motors at a higher output than they are intended (full EV as opposed to hybrid).
But I would defer my speculation to the experts in any case. Perhaps the specs of the inverters are close enough to not be a worry.
Re: Toyota / Lexus useful bits
Posted: Thu Feb 13, 2020 9:56 pm
by RE3Rotor
That is the part I am unsure of. If we are bypassing the boost controller and going by pack voltage, then there shouldn't be that much of a difference? Of course I can just be pulling something out of thin air.
Re: Toyota / Lexus useful bits
Posted: Thu Feb 13, 2020 10:01 pm
by Kevin Sharpe
RE3Rotor wrote: ↑Thu Feb 13, 2020 9:56 pm
That is the part I am unsure of.
I strongly recommend you keep this simple and follow what Damien is doing. Lots 'bells and whistles' will be delivered over time but for now get a car on the road and let other people take the pain of experimentation
Re: Toyota / Lexus useful bits
Posted: Mon Mar 02, 2020 9:07 am
by Kevin Sharpe
Would anyone like to organise crowdfunding for a 3D scan of the GS450H CVT? We have one in Ireland that we could get scanned at the same time as the Tesla Model 3 drive units
Yes I’m interested, would be very handy to have even a 2d drawing of the bell housing.
Re: Toyota / Lexus useful bits
Posted: Mon Mar 02, 2020 1:11 pm
by NiHaoMike
Kevin Sharpe wrote: ↑Mon Mar 02, 2020 9:07 am
Would anyone like to organise crowdfunding for a 3D scan of the GS450H CVT? We have one in Ireland that we could get scanned at the same time as the Tesla Model 3 drive units
Have you tried 3D scanning with just a camera and some free software?
Re: Toyota / Lexus useful bits
Posted: Mon Mar 02, 2020 6:45 pm
by Kevin Sharpe
NiHaoMike wrote: ↑Mon Mar 02, 2020 1:11 pm
Have you tried 3D scanning with just a camera and some free software?
Sure, i'll add that to my todo list, always happy to help you guys even though I have no plans to use the Lexus CVT
Re: Toyota / Lexus useful bits
Posted: Mon Mar 02, 2020 7:26 pm
by Dilbert
I think the problem with the camera approach would be accuracy.
I was considering doing a cardboard template and scan it on the A3 copier, then into solidworks and scale to known dimensions. Or maybe my angle gauge and ruler to get the bolt patter with respect to the input shaft.
Re: Toyota / Lexus useful bits
Posted: Mon Mar 02, 2020 10:31 pm
by xp677
Dilbert wrote: ↑Mon Mar 02, 2020 7:26 pm
I think the problem with the camera approach would be accuracy.
Can be verified with manual measurements. No need for high precision on this unit.
Re: Toyota / Lexus useful bits
Posted: Tue Mar 03, 2020 11:11 am
by Dilbert
If people are going to use this data to design mounting brackets/supports for the bell housing it should be accurate. It only needs to be scanned once correctly then people can design and build off that.
I have used the camera based apps, they do work of on some things, but the data might not be great, for example will it capture all the holes correctly.
Does anyone have a ball park we would need to raise for the laser scanning? I’m sure there would be economy of scales if a few units done together.
Re: Toyota / Lexus useful bits
Posted: Tue Mar 03, 2020 4:22 pm
by xp677
I wouldn't rely on scanning with home equipment for bracketry, regardless of precision.
I marked my front plate using welding clamps and a punch. I welded my rear clamp as loose plates bolted to the mounts. I imagine most others would do the same. Every application will be different, and would likely be built in place.
For the front bracket, a paper rubbing, measured flat on a table and input into CAD software, or transferred straight to metal, would provide adequate tolerance for this part, it does not have to be perfectly centred as there is no rotating assembly to align, unlike with most engine > gearbox plates.
Re: Toyota / Lexus useful bits
Posted: Thu Mar 05, 2020 4:17 am
by sfk
NiHaoMike wrote: ↑Mon Mar 02, 2020 1:11 pm
Have you tried 3D scanning with just a camera and some free software?
That's what I would suggest if you're looking for a proportionally accurate 3D model that shows the shapes and volumes.
The model produced is of an arbitrary scale and orientation but a little cross-referencing of some obvious dimensions is needed to correct.
This method usually isn't going to be good enough to resolve mounting surfaces for the purpose of making engineering plans etc.
More for the purpose of scanning the drivetrain tunnel and the gearbox and seeing if they will fit together with adequate clearance and seeing how far their mounting points are away from each other.
Re: Toyota / Lexus useful bits
Posted: Wed Apr 01, 2020 1:45 pm
by hugow93
Does anybody have measurements for the length, breadth and height of a GS450h transmission? Would love to try one of these conversions, but concerned the transmission would be too big for the transfer tunnel of my SJ413 donor vehicle. They don't have to be nanometre precise, just accurate enough to let me know if it will fit!
Thanks in advance!
Re: Toyota / Lexus useful bits
Posted: Wed Apr 01, 2020 7:23 pm
by sfk
hugow93 wrote: ↑Wed Apr 01, 2020 1:45 pm
Does anybody have measurements for the length, breadth and height of a GS450h transmission?
Info from XP677 in response to question asked previously :
Overall height (oil pan to top of bellhousing) is 39cm. Bell housing is full height, i.e. 39cm diameter, when the transmission is sitting on its oil pan (as it is on my bench), the bellhousing still just about touches the bench.
Widest point is 40cm, includes a bump for a starter motor which I don't believe the GS450h even has. Likely leftover to mate with the 2GR engine.
Overall length including tailshaft, output flange, and pilot shaft, is 82cm.
Transmission is tapered quite heavily, the width and height is closer to 25cm after the bellhousing, but hard to gauge due to various outcropping parts (motor cables, oil pump, PRNDL selector, etc)
Weight feels like in excess of 100kg, I'd say closer to 120-150kg.
Re: Toyota / Lexus useful bits
Posted: Wed Apr 01, 2020 8:41 pm
by xp677
I'll put this in the wiki. Damien found the actual weight a while back, can someone dig this out please and update the wiki.
Re: Toyota / Lexus useful bits
Posted: Wed Apr 01, 2020 9:40 pm
by Kevin Sharpe
xp677 wrote: ↑Wed Apr 01, 2020 8:41 pm
I'll put this in the wiki. Damien found the actual weight a while back, can someone dig this out please and update the wiki.
hugow93 wrote: ↑Wed Apr 01, 2020 1:45 pm
Does anybody have measurements for the length, breadth and height of a GS450h transmission?
Info from XP677 in response to question asked previously :
Overall height (oil pan to top of bellhousing) is 39cm. Bell housing is full height, i.e. 39cm diameter, when the transmission is sitting on its oil pan (as it is on my bench), the bellhousing still just about touches the bench.
Widest point is 40cm, includes a bump for a starter motor which I don't believe the GS450h even has. Likely leftover to mate with the 2GR engine.
Overall length including tailshaft, output flange, and pilot shaft, is 82cm.
Transmission is tapered quite heavily, the width and height is closer to 25cm after the bellhousing, but hard to gauge due to various outcropping parts (motor cables, oil pump, PRNDL selector, etc)
Weight feels like in excess of 100kg, I'd say closer to 120-150kg.
Thanks a mill for this!
I took some measurements and it's pretty clear that unfortunately the transmission will be too big for my donor vehicle. I'll look at using a Nissan Leaf system instead.
On the off chance that anybody is interested, the transfer tunnel for an SJ413 is (approximately) 20cm wide and 24cm high, tapering down to 15cm high at the transfer case end. At the open end it's 41cm wide and 30cm high.
Thanks again!
Hugh
Re: Toyota / Lexus useful bits
Posted: Wed Apr 01, 2020 10:24 pm
by xp677
You can always poke the front of the transmission out into the engine bay somewhat. Or grind off the bellhousing and use the front cover bolts to mount the transmission.
