Problem, can't go over 2.5rpm ! :(

[Sasquachulator]

Originally Posted by daiheadjai

Isn't this a fail-safe installed in the wake of the mythical Sudden Unintended Acceleration "problem" that the U.S. gov't found with Toyotas?

I believe someone mentioned that before...

Nope its clearly a troll on Toyota/Subaru's part to piss off drag racers using auto trannies.

[zoomzoomers]

Originally Posted by daiheadjai

Isn't this a fail-safe installed in the wake of the mythical Sudden Unintended Acceleration "problem" that the U.S. gov't found with Toyotas?

I believe someone mentioned that before...

^ that is exactly why they do this on newer cars.

Originally Posted by sho220

Tell that to these "ladies"...

[Sasquachulator]

Originally Posted by K2wings

Did you actually know that it's not an AT, its a semi-manual. You can shift like a manual, it's the same. Actually, it's better, since you can't miss your gear like in MT.

It's an automatic like in a minivan, or any other car with an automatic transmission that isnt a DSG/SMG/dual clutch system.

It's just set up in a different way than those automatics.
And it all came from the Lexus ISF.

The ISF came out amidst some criticism that it was getting an 8 speed automatic transmission to take on the germans with their dual clutch boxes. And the fear was because its an automatic, its automatically gonna suck when it comes to shifting via paddles or +/- on the shifter (because up until the ISF all paddle shifted automatics have been pretty much garbage in the shifting response/time/feel department)

But Lexus did something clever, it locked up the torque converter in 2nd to 8th gear so that gear changes dont have that delay that all other autos have (or whatever technical mumbo jumbo this involves). this allows the transmission to work very similar to a dual clutch system without being a dual clutch system. i think one drawback to this system is that you still get the typical automatic transmission parasitic drivetrain power loss that is higher than in a clutch based transmission.

they adapted this system into the FRS/BRZ transmission so it functions the same way. Note it is NOT the 8speed lexus transmission with 2 gears lopped off.

[LSxJunkie]

Originally Posted by zooki

I don't think you are going to be able to change the stall speed of the torque converter through a tune. The transmission isn't a "semi automatic" because it still has a torque converter in front of it. The converter is a lockup converter, but still a converter. You really wouldn't want to lock up the converter anyway as you would lose the torque multiplication that the converter supplies. This is what lets an automatic get away with less gear in the rearend, but still achieve decent acceleration. You would have to change it out to a higher stall speed converter, and I don't think anyone is making one yet.

Oh look, someone who actually understands how a torque converter works.

I don't know how much of a market there would be for a bigger stall. The car would drive like shit around town and the unit would either have to be engineered to lock up like the stocker or it'll just drive like dogshit all the time. I've driven a couple stalled 4L65 and 4L80 cars. They were fun as hell.....because they were 450+hp muscle cars. I think it'd just make this car feel slower and sloppy.

Originally Posted by Sasquachulator;

But Lexus did something clever, it locked up the torque converter in 2nd to 8th gear so that gear changes dont have that delay that all other autos have (or whatever technical mumbo jumbo this involves). this allows the transmission to work very similar to a dual clutch system without being a dual clutch system. i think one drawback to this system is that you still get the typical automatic transmission parasitic drivetrain power loss that is higher than in a clutch based transmission.

they adapted this system into the FRS/BRZ transmission so it functions the same way. Note it is NOT the 8speed lexus transmission with 2 gears lopped off.

I've driven an IS-F around Monticello. What that transmission does is lock the torque converter when you are in 2nd through 8th, but it unlocks it to blip the throttle between gears. It actually doesn't do this perfectly either. On a few softer laps, I wasn't braking aggressively for the downshifts I was asking for. Even though the TC was unlocked it was still putting power through to the transmission (when unlocked, a TC can actually put more power to the trans) and the car was actually jerking forward a bit with each downshift as I braked for corners.

Also, planetary automatics use more power to turn than standard manual transmissions. I don't know what the drivetrain loss is through a DSG/DCT/DKG.