SLIP TEST - Lexus RX 200t AWD vs Porsche Cayenne Turbo 4.0 V8 -  

In diagonal test the system cuts the throttle hard and immediately. But when three wheels are spinning then it allows to rev it more and lets the traction control to do its job. Software issue.

@@4x4.tests.on.rollers Thanks for the response

@@4x4.tests.on.rollers so, in real life a lexus driver has to dig a hole under the rear wheel that has traction to pass the diagonal :)

@@sergeyg436 Yes, that would help! But he must dig only under rear wheel 😉

Toyota makes amazing 4x4 and some of the worst AWD systems...the previous gen of Rav4 was ridiculous.

@@jpch8814 It wasn't that bad: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-oxluunv9Ebg.html

@@4x4.tests.on.rollers the hybrid Rav4 (not the Prime version) is really bad.

@@nikolayrayanov2895 Previous hybrid generation was really bad. Current one is better but still much worse than petrol version.

There's no magic. SYSTEM CUTS THE THROTTLE hard in diagonal test. It is not possible to rev it more.

@@4x4.tests.on.rollers In that case: Terrible Lexus, even with TC OFF???

@@almostbutnotentirelyunreas166 That is one of just a few cars where TC OFF means that traction control is really off, so car is left with open differentials, no help from the brakes. Coming back to diagonal test - watch at 3:57 - that's the attempt where we tried to "fool" the system by hard and rapid press of acceleration pedal - even then it didn't work, there was immediate throttle cut.

@@4x4.tests.on.rollers OK, so how does the Lexus clear the 'LF wheel only traction' hurdle? One wheel provides more traction than 2? How?

@@almostbutnotentirelyunreas166 That's not a traction issue but a software issue. Three wheels spinning - no serious throttle cut. Actually that's quite similat to previous generation of RX, you can find the tests on my channel.

Wykonane samodzielnie.

@@4x4.tests.on.rollers A to ładnie :D

AWD system of Lexus is very different from torsen based quattro. It is similar to haldex systems.

@@4x4.tests.on.rollers that is true. I was just referring to it's behaviour on the rollers. Zero friction on one wheel - no moment transferred to other wheels.

@@myslecinaczej8674 The biggest problem for Lexus RX 200t is diagonal test - systems cuts the throttle and traction control cannot do its job. It doesn't cut so much in lateral test and in three roller test so the problem is in software. When it comes to torsen - _Zero friction on one wheel - no moment transferred to other wheels_ - (I understand that you mean torque) - that's not correct statement. Even the wheel in the air needs several dozen Nm to spin - then other side gets a few times more (TBR value). In open diff both sides would get the same Nm value.

@@4x4.tests.on.rollers you are always patient when responding and this time I made a shortcut trying to describe the similarity but it was not technically accurate and you captured that as always 😃

@@myslecinaczej8674 Good point, I wasn't aware of that. Is that annoying?

Yeah, Lexus RX have really poor track performance and Off-road performance, I will say the only great Lexus SUV is their GX and LX

I am sure Lexus is on the top of the list as far as quality and comfort are concerned! Suspension quality, cabin isolation is always top notch. AWD is one of the worst in the business though. Even worse is the hybrid version. But in practice it likely works on decent level.

These AWD systems help in snow conditions. With a proper winter tyre you should not have a problem even with FWD…

@@npapan Depending what kind of snow , mud, sand and inclination we need to deal with. I need an AWD car with decent capability. Period.

@@npapan Even with winter tires FWD cars can get stuck, especially over icy hills, or in diagonal situations, that's where the AWD saves you. Regardless you are justifying a complete failure and ripoff by Lexus.

We were filming a dash a few times but usually we don't do that.

During diagonal test, system is cutting the throttle. In other tests it allows for more rpm and lets the traction control system do its job.

@@4x4.tests.on.rollers Oh I get it, thanks!

Porsche is rwd biased and maybe that's a reason... Its awd system is probably performance tuned.