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V8 and V6 Transmissions / Driveline (6L80 / 6L50 / TR6060 / AY6) Driveshafts | Differentials | Gears | Rearends | Clutch | Shifters

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Old 01-07-2009, 08:02 AM   #1
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Which transmission will the L99 have?

anyone know which transmission the L99 will have?

I'm interested in the lockup %, I normally dont like auto's, but the latest offerings I've tested are brilliant

BMW uses a ZF 6 speed in the 135i and 335i, and it's like driving a manual, it stays locked up all the time, completely different than the transmission in the 128i/328i which is a GM transmission and does not lock up like the ZF does.

On the ZF when you let off the gas at speed, it behaves just like a manual, it does not drop the rpm, it stays where it's at, so there's none of that lurching when you get back on the gas, the RPM is locked to the speed, it operates at 99% locked up bypassing the torque converter, I'm not sure what the exact percent is, but it's very high, it's almost as good as the new dual clutch aka DCT in the M3

it also does double gear downshifts, and rev matching downshifts, it's really a joy to drive


so anyone know what transmission the L99 will have, and if it will have nearly 100 % lockup like the newest ZF's have?
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Old 01-07-2009, 08:05 AM   #2
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GM Hydra-Matic 6L80
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Old 01-07-2009, 10:52 AM   #3
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looks like that's in a few GM products already

does the G8 use that one too? I cant remember how it shifted when I drove it, it was unremarkable though, I don't think it had the double gear drop down
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Old 01-07-2009, 11:49 AM   #4
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It's rev-matching, and fully-controllable. This transmission is the automatic used in the Corvette. But I don't believe it's locked up 99% of the time...
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Old 01-07-2009, 12:07 PM   #5
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Quote:
Originally Posted by mega View Post
looks like that's in a few GM products already

does the G8 use that one too? I cant remember how it shifted when I drove it, it was unremarkable though, I don't think it had the double gear drop down
Here's a list of cars that I've found that it's used in.

* 2006 Cadillac XLR-V
* 2006 Chevrolet Corvette
* 2006 Holden VE Commodore
* 2006 Holden WM Statesman
* 2006 Holden WM Caprice
* 2007 Cadillac STS
* 2007 Cadillac Escalade
* 2007 GMC Yukon Denali
* 2008 Hummer H2
* 2008 Pontiac G8
* 2009 Cadillac CTS V-Series
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Old 01-07-2009, 12:11 PM   #6
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some people are saying the 6l80 will never live long behind 500+hp engines,, i say b.s., the cadillac cts-v is over 500hp and comes stock with the 6l80 trans and has 100,000 mile powertrain warranty
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Old 01-07-2009, 12:19 PM   #7
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Quote:
Originally Posted by Dragoneye View Post
It's rev-matching, and fully-controllable. This transmission is the automatic used in the Corvette. But I don't believe it's locked up 99% of the time...
Are you sure it's rev-matching? I remember reading an article about the Corvette and they said it was not rev-matching.
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Old 01-07-2009, 12:27 PM   #8
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What the heck is rev matching??
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Old 01-07-2009, 12:28 PM   #9
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http://www.autobuyguide.com/2008/12-...ews/index.html

http://www.edmunds.com/insideline/do...ticleId=129446

On the G8, and going to be employed on the Camaro...
I could have sworn GM had their own literature talking about it too, but I couldn't find it.:(

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What the heck is rev matching??
When you downshift, the computer blips the throttle revving up the engine so it's speed is matched to the gear your shifting into.
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Old 01-07-2009, 12:42 PM   #10
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Oh cool! Thanks.
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Old 01-07-2009, 05:22 PM   #11
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heres a page you can check out and get the gm literature on engines and tranny.

http://media.gm.com/us/powertrain/en...2009/09car.htm
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Old 01-07-2009, 09:03 PM   #12
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If it is like the G8GT, when you are in manual mode, the convertor is locked. And, the stock convertor has a twin lock up disc which will support quite a bit of power locked.
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Old 01-08-2009, 02:22 AM   #13
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Quote:
Originally Posted by Dragoneye View Post
http://www.autobuyguide.com/2008/12-...ews/index.html

http://www.edmunds.com/insideline/do...ticleId=129446

On the G8, and going to be employed on the Camaro...
I could have sworn GM had their own literature talking about it too, but I couldn't find it.:(


When you downshift, the computer blips the throttle revving up the engine so it's speed is matched to the gear your shifting into.
I still don't understand where the rev matching comes into play or how to do it on the automatic when you switch it to tap-shift mode. Is it down-shifting around a corner to gain speed? Can you explain certain situations where this is used and how to use the feature and what it would be like without it. Thanks
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Old 01-08-2009, 03:25 AM   #14
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Have you ever done heel-toe downshifting on a manual? Its a lot like that and serves the exact same purpose.
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Old 01-08-2009, 08:41 AM   #15
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Originally Posted by camaro1 View Post
some people are saying the 6l80 will never live long behind 500+hp engines,, i say b.s., the cadillac cts-v is over 500hp and comes stock with the 6l80 trans and has 100,000 mile powertrain warranty
From first hand experience, it will handle a lot more than 500 HP. The torque converter is the weak link. I have seen more than 650 RWHP about 780 HP with no problems.
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Old 01-08-2009, 08:45 AM   #16
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From first hand experience, it will handle a lot more than 500 HP. The torque converter is the weak link. I have seen more than 650 RWHP about 780 HP with no problems.
u mean if you stick a tq converter in the there it will mess everything up and cause problems?
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Old 01-08-2009, 08:56 AM   #17
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u mean if you stick a tq converter in the there it will mess everything up and cause problems?
The sprag in the torque converter is the weak link and can fail under high torque. There is stronger units made that will handle the torque.

And yes, if you add a higher stall torque converter without reprograming the ECU and TCU, all that will happen is the TM will kick in sooner limiting your performance gain. With sticky tires on a GTO, Camaro, and Corvette, 60' times with a stock converter VS high stall, there is typically a 4 tenth gain. I have seen little to no gain until the TM was progammed out.

So as long as you get it programmed with good software that has most if not all the TM tables found, you will be fine. The manuals have it too.

Most hand held programmers are garbage. HP Tuners currently make the best software for reprograming.
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Old 01-08-2009, 04:41 PM   #18
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my bad, i said the cadillac CTS-V had the 6L80E trans also,, but it doesnt, it has the 6L90E that is a heavier duty version of the 6L80E and is about 40mm longer than the 6L80E

so if the 6L80E doesnt hold up well with the higher hp numbers a 6L90E swap should cure the problem


also here is some ineresting info on the 6L90E trans in the CVS-V, it will only start in first gear for the first key cycle forward movement, this is to check the first gear range and the low gear ratio is then no longer used for forward take-offs. when in manual mode the driver can select first gear and the gear range is displayed on the driver info center

also the 6L90E cts-v trans is electronically limited to 175 mph


i will be going with a vig converter and i have hp tuners to deal with the tm
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Old 01-08-2009, 07:12 PM   #19
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i will be going with a vig converter and i have hp tuners to deal with the tm
Someone knows the good stuff
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Old 01-08-2009, 07:53 PM   #20
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Quote:
Originally Posted by Supermans View Post
I still don't understand where the rev matching comes into play or how to do it on the automatic when you switch it to tap-shift mode. Is it down-shifting around a corner to gain speed? Can you explain certain situations where this is used and how to use the feature and what it would be like without it. Thanks
You don't...do it...per say. It's done automatically.
Do you have an automatic car? It'd be easier to explain if you do.
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