Are ​​​​the ventilated seats in the 3IS/3.5IS linked to the fan speed and/or the AC setting? That is, if I run the ventilated seats without turning on the fan, they're pushing air but if I turn the fan on, will it make the airflow faster?

Also, if I turn the AC on and set it to a lower temperature (ie. LO) will that cause the air circulated in the ventilated seats to become cooler as well?

Short answer - no. The ventilated seats do just that - they merely provide ventilation to the seat bottom and back. So, whatever air is in the car will be used. For this reason, I like to let the car cool down a bit before turning them on.

As for the fan speed, they seem to operate independently of the HVAC system.

Thanks, I've been using the AC with ventilation seats most of the time anyway. Are the intakes on the lower back of the seats (ie in the rear passenger footwell)? If so, that would give me a reason to open the rear AC vents (as I have them completely shut, as in I turn them outwards until they click) in order to shoot cool air to the intakes for the seats.

If you want to increase the airflow to your ventilated seats, read this entire thread:
https://www.clublexus.com/forums/is-...nted-duct.html

I ordered it right away and will update this thread and the other one with my thoughts after I get it. Thank you for bringing my attention to this item.

Here is a perhaps not so dumb question that I didn't see the need to make a thread for... Can a transmission oil cooler be fitted to both 6 speed and 8 speed transmissions? I saw a 2IS thread (https://www.clublexus.com/forums/is-...installed.html) where a guy screwed some fittings into the two holes beneath the OEM heat exchanger. Apparently the oil cooler hose fittings for the 2008-2013 Sequoia and 2007-2019 Tundra will screw right into that transmission. Namely what I would like to know is if the heat exchanger holes are still threaded on the A760H and AA81E. I would assume they are as both are relatives to transmissions with threaded holes (I.E. the AA80E, and the A760e).

Here's yet another dumb stupid question but can't find any answers online...

Going away for a few months, and a rear tire has sidewall leaking issues (< 0.5 lbs per day), so I jacked up the car at that one tire.

Leaving the car jacked up at one wheel for a few months is completely harmless right? TIA !!

Depends where you're jacking it and how exactly it's going to be left.
Regardless the tire will be flat after a few months...it will probably be flat in a few weeks.
If you're worried about the tire going flat and the weight of the vehicle being on it, consider the car isn't going to be moving...it also sounds like you need a new tire anyways.
If you have a sidewall leak that bad then the tire is already compromised.

I don't recall seeing anyone mention doing this on a 3IS.
There was an entire thread exploring the possibility of installing a transmission cooler...it basically came down to one question, "Why?". Which there wasn't a legitimate answer for.
I guess you may want to consider the same question.
There is one member on here with a twin turbo IS350 RWD making almost 600rwhp, and he's running the stock transmission. Obviously he's not driving it like a little old lady.

The holes may be threaded, and for the time it takes to jack the car up and remove the 3 bolts holding the cooler on, you could find out quickly if they are and what size, thread pitch they are also.
Chances are if they are threaded it would be the same size as the 2IS holes since the trannys are in the same family as you mentioned.

Here is a question I wonder if someone knows?

Does anyone know what was done with the 3.5 V6 that changed the hp and tq ratings from the earlier years to the newer years rating from 306hp to 311hp. I know the engine code is different, but was it the intake, cams, exhaust? Anyone know exactly?

Any idea which kit this is, or is it a custom setup? I'm starting to think that I will have to do this after the warranty is up, in order to have the turbo AWD IS350 that Lexus won't make for me lol

I suspect it's partially to do with the changeover from VVT-i to VVT-iW on the intake cams. This increases the range of valve opening angles, which is mainly meant for improving fuel economy. However, the 3 lb-ft and 5 horsepower are insignificant gains, and in fact, I'd say the horsepower is mostly thanks to a small increase in rev limit. Other than an integrated catalytic converter in the exhaust manifold, allowing cooling of exhaust gases before the cat... I don't know of any other significant changes. Ultimately it's still a 2GR, just now it has some small efficiency improvements and part-time Atkinson cycle capability.

Most definitely all custom. https://www.clublexus.com/forums/is-...rbo-is350.html

​​​​​​There goes my mini dream of twin turbocharging the IS350 without a literal bank attached to my wallet. That is an insane build!! At most I would rather go with the existing supercharger kit, as the IS350 just needs a little more low end torque.