is300h transmission

[andybpowell]

Has anyone actually used an Is300h transmission in a conversion yet, on paper it looks good, lighter than the 450h and no external oil pump but I've not seen any conversions using it so far and I'm really tempted to so that I can get a bigger battery in my Z3 I know @Domt177 had one in his E46 but that project seems to have stalled about 6 Months ago If I was still working I would have just tried it But since I'm now retired I have to be a bit more cautious throwing money about

[andybpowell]

Well I got bored with looking for someone who has actually used a lexus is/gs 300h l210 transmission I'm sure people have but nobody's being very forthcoming with any details so I'm just going to do it myself
So I've ordered an is300h l210 transmission, inverter, Zombieverter and an Is300h propshaft this is going to replace the 110kw leaf motor/inverter and getrag gearbox in my Z3

[Jacobsmess]

Please let us know how you get on, I for one would be interested in the max rpm you can achieve and at what voltage, so far I've seen up to 30rpm/V from others that have used the GS450H and GS300H but some did state it could go higher...

[mugball]

I'd also be very interested to hear how this pans out, thanks!

[andybpowell]

I'll continue this in my build thread

viewtopic.php?t=4064

[Woodfie]

This last month have been aiming to find how usable the Gs300h L210 is, progress is that have a drivable rig to help find dome answers... Early days, but progress to here so far.

[Zechy]

I'm using the is300h inverter with a GS450h transmission and a Zombieverter. I've driven it about 120km. But I am having issues.

It feels like a rev limiter. It stutters like the power is cut to zero and then comes back again.
When using MG1 and MG2 it won't go faster than about 65km/h - around 3000rpm
When using only MG2 it won't go faster than 85km/h - around 4000rpm

In addition it is pretty low on power. I only get 125Amp on MG2.

Timestamp udc2 idc speed torque pot pot2
2023-12-02T10:06:24.188 304.87 -123.2 2147.06 3500 2507.14 1257.96
2023-12-02T10:06:24.907 304.8 -122.2 2305.85 3500 2496.44 1252.64
2023-12-02T10:06:25.636 304.61 -122.16 2466.37 3500 2531.13 1269.92
2023-12-02T10:06:26.330 304.42 -122.21 2607.76 3500 2499.23 1253.89
2023-12-02T10:06:27.058 304.23 -122.42 2746.86 3500 2498.79 1254.12
2023-12-02T10:06:27.799 303.86 -123.92 2873.9 3500 2564.94 1287.22
2023-12-02T10:06:28.486 303.68 -123.9 3000.61 3500 2783.04 1412.6
2023-12-02T10:06:29.311 303.45 -124.61 3113.31 3500 2782.81 1407.8
2023-12-02T10:06:30.037 303.15 -125.52 3243.02 3500 2751.9 1380.98
2023-12-02T10:06:30.769 302.91 -126.17 3350.19 3500 2700.12 1354.53
2023-12-02T10:06:31.566 302.67 -126.81 3455.46 3500 2692.25 1350.74
2023-12-02T10:06:32.495 302.52 -126.74 3565.02 3500 2693.02 1351.24

Does anybody have some data on their 300h setup to share?

[Jacobsmess]

Not much help but it does seem the IS300H inverter is lower power than the GS450H according to official Lexus documents although not as low as that.

[Aragorn]

Does it not sorta make sense, in a way?

The inverter parameters are tuned for the respective motors, in crossing them over like this its entirely possible its close enough to spin, but out by enough that the inverter realises something isnt right and gives a sort of "limp mode"...

I'm sure i read of someone using a Prius inverter with a GS450h recently and also had super low current limits?

[Jacobsmess]

Does it not sorta make sense, in a way?

The inverter parameters are tuned for the respective motors, in crossing them over like this its entirely possible its close enough to spin, but out by enough that the inverter realises something isnt right and gives a sort of "limp mode"...

I'm sure i read of someone using a Prius inverter with a GS450h recently and also had super low current limits?

Possibly which is why I mentioned it, I think Chrsky managed to get the IS300H transmission to run with a Prius gen 3 inverter.

I wonder if limiting the current values in zombieverter/OI to what the IS300H is capable of might help...

[Woodfie]

Interesting information thanks .
Have been describing the Bmwagon as Limited Edition, not nessarily in a good way..
The test rig at present is using MG2 only, and until yesterday had not locked the IC input shaft, so effectively MG1, which has resolver connected, but no UVW, was not rotating, as the input spline was free to turn.
Am using a Prius ZVW30 inverter, with sync serial communication. I had thought it was this set up that was limiting to 45A bus current, and also a speed cap of 53kph, I guess at maybe 2000rpm MG2 speed, I will get a display and confirm this.
Some brief runs, before rain set in, and some fiddling of HTM stream, and managed marginally better, but more testing to confirm this when weather permits.
Will update as progress made.

[Woodfie]

It does seem that operation is in something like constrained to EV mode, but as there is no IC to kick in, feels like a rev limiter or power limiter.

Hope to try some varying HMT data 76, and 78, I think for the Zvw30 inverter.. Will be different numbers on the 300h inverter, and different again on 450h, which the code I am using was derived from. Unfortunately my learned friend and code expert is down with covid at this time.
The task continues.

Locking plate in place,
couldn't find a real pair of Vise grips and a cable tie,

[Woodfie]

Some positive progress. Have checked direction, and function of Mg1 by itself....felt like much less torque than mg2 alone...
Now both connected, with a torque request of mg1 = mg2
as the next step, and have observed a good increase in battery current from around 45A now up to 75A at 280v.
Traffic on the roads is too heavy to go road testing, which is to see if the speed cap of 52.9kph GPS measurement has changed.
Pleasing Progress.