Yeah but the system does overheat and Japanese tuners have found some weird quirks with the system, like when making a certain amount of power the system defaults to fwd.
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GR Yaris ITCC Unit / Diff Oil Thread - Do they use the...
This was discussed in another thread but I thought it deserved its own independent thread to make it easier for anyone who may be searching for it. I finally got around to stripping the ITCC unit off the diff housing and as I thought its completely separate to the diff oil. The shaft in the...
www.gr-yaris.co.uk
Looks like the coupling is completely separated from the rear diff and doesn’t share fluid between the two. Additionally, the temp sensor is measuring air temp around the unit, and not the fluid.
FYI, JTEKT supplies Type B Torsen LSD and ITCC for Toyota GR Yaris, it actually likes haldex (even technically simpler than old hydraulic Haldex) without the torque vectoring provided by two separate clutch on the rear axle.
it's not like an entirely brand new thing, a lot of car use ITCC like new cx60 and Outlander etc., but GR4 is kinda modified like using 12 pairs + 3 pairs (appears to be) of wet multi-plate clutch plates that distribute torque, probably in order to handle the enormous torque, and clutch plate uses carbon material to reduce heat problem etc.
if you look back at Celica GT-Four's system, it had viscous coupling and locking center diff, more like (at least closer to) rally car
it's not like an entirely brand new thing, a lot of car use ITCC like new cx60 and Outlander etc., but GR4 is kinda modified like using 12 pairs + 3 pairs (appears to be) of wet multi-plate clutch plates that distribute torque, probably in order to handle the enormous torque, and clutch plate uses carbon material to reduce heat problem etc.
誰でも簡単にドリフト!? 異例の前後駆動力配分を持つトヨタGRヤリスのAWDシステムGR-FOURとは？｜Motor-FanTECH[モーターファンテック]
オンデマンド式なのにフロント30：リヤ70の駆動配分？ 機械の構造からはどうなっているのかが理解できない数字である。果たしてどのような仕組みにしているのか。その中身は仰天の一言であった。 TEXT：髙橋一平（TAKAHASHI Ippey）
car.motor-fan.jp
if you look back at Celica GT-Four's system, it had viscous coupling and locking center diff, more like (at least closer to) rally car
That is a very interesting read. I expect the temperature sensor is buried up in there enough that it is measuring right next to the unit, but it is a bit of a strange choice to make it external.
GR Yaris ITCC Unit / Diff Oil Thread - Do they use the...
This was discussed in another thread but I thought it deserved its own independent thread to make it easier for anyone who may be searching for it. I finally got around to stripping the ITCC unit off the diff housing and as I thought its completely separate to the diff oil. The shaft in the...
Looks like the coupling is completely separated from the rear diff and doesn’t share fluid between the two. Additionally, the temp sensor is measuring air temp around the unit, and not the fluid.
The expanded Cusco diff cover (which may or may not help much) also seems to be a side plate, interestingly enough; it's not a back cover like I'm used to seeing on differentials. (Though Banks Power has a great video or two on how differential back covers can really mess up the oil flow if not designed properly, so the side cover design should help.)
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