DOES IS350 2014 F-sport has a lock up torque converter? I just got the car. Wont be driving much until i visit tag office and register it.

 

Do you have the RWD or AWD?

 

Are you talking about the differential? like Limited slip or not? If im not mistaken I would think that all the torque converters regardless of 6 or 8 speed would function the same.

 

Please don't post the same question in multiple threads, as doing so can cause confusion. This question was already posted in the new members thread: https://www.clublexus.com/forums/is-...l#post10732021

Having its own thread is probably more appropriate. I had a brain fart and thought it was in the "Dumb/Simple Questions" thread, so I answered it.

 

Sorry bout that. I am new here. BTW my car is Rear wheel drive. When I say lock up torque converter I mean Transmission locked like a manual car and not the fluid moving the input shaft of transmission. I know ISF has that lock up feature. I am not sure if IS350 has it. I saw several videos where guys either turbo or supercharge the IS350 and when they accelerate the transmission you can see slipping and trying to catch up to the engine RPM and power. If it had locked up it would just spin tires on pavement rather than slipping the transmission.

 

torque converters are different from limited slip. Torque converters are part of automatic transmissions only where the transmission fluid is rotated using output shaft from engine and that turbulence and rotation of fluid then rotates transmission input shaft to deliver to the wheels.

Lock up torque converters tend to Lock in place after first gear to provide full contact power like manual clutch rather then using fluid as the median of transferring power to transmission. This eliminates loss of power usually caused in auto transmissions. Shifts become quick and crisp due to Instant 1 on 1 contact and lock in place rather than slipping of fluid.

 

Simple answer to your question...yes, it has a lockup torque converter.
I can't imagine or name a car made in the last 25-30 years that does not have one...this does not include electric, some hybrids, and CVT's.

The "slipping" you are describing about turbo or supercharged IS's would occur with a lockup converter or non-lockup one.
It's not a drag car, the lockup doesn't work the same way.
Lockup in most cars occurs in the higher gears and when the vehicle is cruising, not under hard acceleration...you will simply notice the RPM drop a few hundred when at a constant cruising speed.
It's purely there for fuel economy.

 

In manual mode, the torque converter does lock up. In higher horsepower and rpm application in some of these builds/videos you may see, they tend to slip anyway past a certain point.

 

I'm aware of the differences between a torque converter and a differential...lol. I was simply asking which you were referring to, as not many people discuss the specifics of our transmissions, and more of the discussion seems to be pointed in the direction of having the rear end lock up through an LSD.

That being said, the torque converter locking and unlocking is definitely a known problem in tuning.

By that I mean, having the RR tune allows your motor to rev to 7200 RPM. When the trans gets hot, the converter likes to unlock at the stock 6800, hesitate for a second, then re-lock and go to 7200. This is super annoying to deal with in the summer. A trans tune would allow the torque converter to stay locked until 7200, or even 7400. RR has 7400RPM tune files, but they just aren't worth it with how the transmission is acting up without a tune. Rumor is they're working on a trans tune to remedy this.

 

I don't think that anyone answered the question. The 8-speed is "special" in that when it's in manual mode, it's locked-up in all gears except first. No slush at all. Jam it through the gears while on the gas, and the it's obvious. BTW this makes the throttle-blipping on downshift that it has almost mandatory.

Normal automatics do not have this feature. Under load, they can come out of lock to allow more RPM's without a gear change.

 

The 6-speed also does this. Admittedly it doesn't shift as quickly.

 

Perfect Answer! exactly what I was looking for! Thanks a lot man