2015 New 8 speed transmission
Thread Starter
Racer
Joined: Jun 2014
Posts: 324
Likes: 6
From: Mother Load California
2015 New 8 speed transmission
Dose anyone know if Electronic Limited Slip Differential is standard on the new Automatic Transmission without Z51 package. I thought I read somewhere where it dose come with it, however I was also told all standard Corvettes have some form of limited slip differential.
Safety Car
Joined: Jan 2006
Posts: 3,940
Likes: 42
From: shavertown Pa.
you don't get ELSD unless you buy a z51, that is why I opted for the z51
I did mean to say it the right way but you know what happens when you get old.
I did mean to say it the right way but you know what happens when you get old.
Last edited by bob guzzy; Mar 21, 2015 at 08:12 PM.
Thread Starter
Racer
Joined: Jun 2014
Posts: 324
Likes: 6
From: Mother Load California
Ok, so there is some form of "limited slip differential". So do you know what the differences is and how it would translate for someone like me who dose not intend to track the car. Thanks!
Drifting
Joined: Oct 2006
Posts: 1,372
Likes: 311
From: Bristol, VT
The Z51 comes equipped with an electronically controlled limited slip differential. This is an LSD that the computer controls lock up on, anywhere from totally open to fully closed, depending on conditions. This is not to be confused with some other "E diffs" that are actually open diffs that the computer uses the rear brakes in order to simulate lock up.
The advantages of the eLSD in the Z51 vs. a pure mechanical type is that some situations, such as initial turn in, would be best with no LSD, so that the rear wheels can rotate at different speeds as the car takes a corner. In a straight line or starting to apply power coming out of a turn however, an open diff would start to unload, and you'd only send power to one wheel that was slipping. Therefore an LSD is advantageous in these situations, as up to the set "break away point", the LSD keeps both wheels spinning and therefore putting power to the ground.
Therefore being able to have an open diff in some situations and go to full lock up in others, and vary in between those states in still others, is a sort of "best of both worlds" thing. Combine that with the Magnetic Ride Control available on Z51 and you end up with another "best of both worlds" scenario with the adaptive suspension.
Obviously the eLSD benefits track work, but as it helps promote turn in and "steering feel" it may be something that gives just as much enjoyment on the street, as steering feel and good prompt turn in can be enjoyed at much slower speeds.
So that's more or less the theory involved. I haven't had a chance to experience a non-Z51 and a Z51 yet, so I can't comment to how apparent it is. The rest of the Z51 suspension is tuned differently as well to promote better handling at the expense of some comfort, so there will be numerous variables at play in comparisons making it difficult to isolate the exact things the eLSD is doing.
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Team Owner
Joined: Sep 1999
Posts: 41,732
Likes: 1,717
From: Springfield MO
Both the standard LSD and the eLSD are of the "clutch" type in the C7. The standard LSD uses fixed rate compression springs to allow the clutch pack to slip with a non adjustable clamping force. The eLSD used a hydraulic cylinder in place of the mechanical springs. The hydraulic system uses electronic data from the car's various sensors to vary the hydraulic pressure, thus allowing for a variable rate of slippage in the clutch pack.
Thread Starter
Racer
Joined: Jun 2014
Posts: 324
Likes: 6
From: Mother Load California
The non-Z51 LSD is a mechanical differential that has a set amount of slip it will allow. OEM type LSDs are usually "clutch type" in that they use clutches to get this specified slip amount wheel to wheel. I would guess the C7 non-ZR1 unit is very similar to what was in past Corvettes.
The Z51 comes equipped with an electronically controlled limited slip differential. This is an LSD that the computer controls lock up on, anywhere from totally open to fully closed, depending on conditions. This is not to be confused with some other "E diffs" that are actually open diffs that the computer uses the rear brakes in order to simulate lock up.
The advantages of the eLSD in the Z51 vs. a pure mechanical type is that some situations, such as initial turn in, would be best with no LSD, so that the rear wheels can rotate at different speeds as the car takes a corner. In a straight line or starting to apply power coming out of a turn however, an open diff would start to unload, and you'd only send power to one wheel that was slipping. Therefore an LSD is advantageous in these situations, as up to the set "break away point", the LSD keeps both wheels spinning and therefore putting power to the ground.
Therefore being able to have an open diff in some situations and go to full lock up in others, and vary in between those states in still others, is a sort of "best of both worlds" thing. Combine that with the Magnetic Ride Control available on Z51 and you end up with another "best of both worlds" scenario with the adaptive suspension.
Obviously the eLSD benefits track work, but as it helps promote turn in and "steering feel" it may be something that gives just as much enjoyment on the street, as steering feel and good prompt turn in can be enjoyed at much slower speeds.
So that's more or less the theory involved. I haven't had a chance to experience a non-Z51 and a Z51 yet, so I can't comment to how apparent it is. The rest of the Z51 suspension is tuned differently as well to promote better handling at the expense of some comfort, so there will be numerous variables at play in comparisons making it difficult to isolate the exact things the eLSD is doing.
The Z51 comes equipped with an electronically controlled limited slip differential. This is an LSD that the computer controls lock up on, anywhere from totally open to fully closed, depending on conditions. This is not to be confused with some other "E diffs" that are actually open diffs that the computer uses the rear brakes in order to simulate lock up.
The advantages of the eLSD in the Z51 vs. a pure mechanical type is that some situations, such as initial turn in, would be best with no LSD, so that the rear wheels can rotate at different speeds as the car takes a corner. In a straight line or starting to apply power coming out of a turn however, an open diff would start to unload, and you'd only send power to one wheel that was slipping. Therefore an LSD is advantageous in these situations, as up to the set "break away point", the LSD keeps both wheels spinning and therefore putting power to the ground.
Therefore being able to have an open diff in some situations and go to full lock up in others, and vary in between those states in still others, is a sort of "best of both worlds" thing. Combine that with the Magnetic Ride Control available on Z51 and you end up with another "best of both worlds" scenario with the adaptive suspension.
Obviously the eLSD benefits track work, but as it helps promote turn in and "steering feel" it may be something that gives just as much enjoyment on the street, as steering feel and good prompt turn in can be enjoyed at much slower speeds.
So that's more or less the theory involved. I haven't had a chance to experience a non-Z51 and a Z51 yet, so I can't comment to how apparent it is. The rest of the Z51 suspension is tuned differently as well to promote better handling at the expense of some comfort, so there will be numerous variables at play in comparisons making it difficult to isolate the exact things the eLSD is doing.
Great explanation, thank you, I'm sure there were many like me wanting or needing a comprehensive overview!
You obviously did such a good job, nobody could add anything else.
Instructor
Joined: Feb 2015
Posts: 164
Likes: 2
Both the standard LSD and the eLSD are of the "clutch" type in the C7. The standard LSD uses fixed rate compression springs to allow the clutch pack to slip with a non adjustable clamping force. The eLSD used a hydraulic cylinder in place of the mechanical springs. The hydraulic system uses electronic data from the car's various sensors to vary the hydraulic pressure, thus allowing for a variable rate of slippage in the clutch pack.
Sounds like they both rock!
That's interesting. I'd like to drive both a bit more to see the differences.
Melting Slicks
Joined: Dec 1999
Posts: 2,029
Likes: 668
From: Tulsa, Ok
Uh... Not trying to one up that nice explanation but uh, here's an excellent article with tons of picture to support the Z51 and how it's electronics tie it all together. Anyone trying to decide base vs Z51 may want to read this:
http://www.edmunds.com/car-reviews/t...alkaround.html
http://www.edmunds.com/car-reviews/t...alkaround.html