Xoutpost.com - Lexus LS460 is a copycat of 7er.

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I'm aware of Audi's DSG, but what is the difference between that system and SMG?

Quote:

Originally Posted by SANguru

nope.. Highly doubt it...they have too much invested in the current SMG setup..

:iagree:

twin clutch on the DSG - which means there are 2 drive shafts and 2 clutches with odd number gears on 1 and even number on another. They preload gears and hence the quicker application like that in R32, Veyron, etc. (patent is owned by VAG). The only downfall to this is slow down shift if you go down 2 gears.

Quote:

Originally Posted by vinuneuro

I'm aware of Audi's DSG, but what is the difference between that system and SMG?

Quote:

Originally Posted by vinuneuro

I'm aware of Audi's DSG, but what is the difference between that system and SMG?

Dual clutch. The transfer from one gear to another makes it significantly smoother by having the second clutch.

Or you could just not drive in S4 mode or higher in SMG.. :D

Quote:

Both clutches are electrohydraulically controlled and this allows two gears to be selected at the same time to minimize interruption in power delivery during shifts. As one clutch opens, the other closes.

http://www.gizmag.com/go/3111/

SANguru beat me to it! :)

I was wrong about Lexus entering the horsepower war...

Quote:

The new LS460 and LS460L, which go on sale this fall as 2007 models, will be powered by an all-new, 4.6-liter V-8 producing about 380 hp and 370 lb-ft of torque, figures that compare favorably with those of the new Mercedes 5.5-liter V-8. (Although Lexus clearly wants to beat Mercedes in the gear-count game, it has little desire to enter the ridiculous horsepower war currently being waged by the Germans.) Lexus promises that the combination of this engine and the eight-speed automatic will result in a 0-to-60-mph time of less than 5.5 seconds while delivering combined city/highway average fuel economy in the high 20s. The current LS430 has a 4.3-liter V-8 producing only 278 hp and 312 lb-ft, enough for a 0-to-60-mph time of 5.9 seconds.

http://www.automobilemag.com/auto_sh...0601_lexus_ls/

However, I think I was on the dot with the goal for Lexus becoming the quickest car...

Quote:

Press announced that Toyota will release further technical details on the LS460 during the Geneva Motor Show in early March and will unveil a hybrid V-8 version of the car at the New York Auto Show in April. "It's the ultimate Lexus," boasts Press. Toyota officials have been quoted claiming that the hybrid LS, which likely will be badged the LS600h, will offer performance rivaling twelve-cylinder German sedans. Them's fightin' words: Toyota might not be interested in one-upping the Germans in pure horsepower numbers, but it's clearly interested in ultimate performance.

http://www.automobilemag.com/auto_sh...0601_lexus_ls/

I can't find any solid specifications about the new Lexus LS460 8sp tranny.

Quote:

Originally Posted by SANguru

Doesn't SMG use two clutches? :dunno:

nope.. single clutch. The 6sp tranny itself is the same in the SMG and the manual 6spd

Quote:

Originally Posted by vinuneuro

Doesn't SMG use two clutches? :dunno:

No, SMG from what I've read is one clutch.

http://forums.e60.net/index.php?act=...e=post&id=6406
http://www.bmwcca.org/Roundel/2004/10/Article_1.shtml

Quote:

The new Sequential Manual Gearbox (SMG) III transmission matches the refinement of the engine: a seven-speed manual gearbox with Drivelogic functions developed and built by Getrag exclusively for the M5. It is not an adaptation of a regular transmission with SGM add-ons, it is a whole new concept, including the multidisc clutch activated by a hydraulic transmission control system whose actuators and control unit are built into the gearbox housing. As hydraulic fluid (pressurized to 1,300 psi) moves a piston in the clutch master cylinder, sophisticated sensors on both sides of the piston monitor its travel. The computer actually starts pulling one gear out of engagement at the same time it begins to push another one in; this procedure allows the new SMG III to shift 20% faster than its SMG II predecessor. Those who found previous SMG boxes "too slow" should have no worries; shifting speed has been reduced to 65 milliseconds. ("We could cut another twenty," says one transmission engineer, "but it would seriously increase wear on the synchros.") The transmission, designed for a 550-Nm torque limit, can easily handle 8,500 rpm.
The use of seven speeds is not to keep the engine in a narrow torque band, but rather to allow more frequent shifts with less of a jump between gears----to eliminate the jerkiness of a normal off-the-gas, inwith- the-clutch, out-with-the-clutch-andgo- again shifting procedure. Sixth gear is direct at 1:1, and seventh is an overdrive.

To increase the shifting speed, as well as strengthen the gearbox, the gears are mounted on two shafts, with the lowest gears mounted closest to the bearing housings. The gear arrangement is ideal for computerized "overlap" shifting, but it completely eliminates any possibility of using the seven-speed as a "left-leg" manual; the shifting gates in the console would have no logical sequence to follow. BMW, of course, sees the SMG gearbox as a technical advance, and is somewhat perplexed at the American demand for a footoperated clutch. (In conversations with BMW AG product director Dr. Burkhard Göschel, Roundel editor Carlson suggested that perhaps Americans see the SMG as being too much of an automatic transmission. "Maybe," sighed Göschel, "we never should have given them the ‘automatic' options.")

Of the PDF, start on page 8 and you can see the tranny. If you look through the details, it doesn't mention a second clutch anywhere nor anything to work the second clutch. That's what I've inferred from those links.

Good stuff guys. Thanks.

Nah...I think you guys make to much out of the "clunk" noise...I got to drive my old LS400 the other day, my Dad has it now....cruised along at 85mph ...no prob had the Mark Levinson cranking....then thought to myself...ya know..."you dumbass! You could have saved $9K if you had just kept this in stead of that BMW...5K on the down payment and sales tax...4K in repairs..an extra $180 per month in a car payment now to borrow the Acura.....then it hit me....I will CPO that X5 as planned 39months and counting...and get the wife the LEXUS and she will be happy and I can borrow it..BRILLIENT!!!!...<sigh>