How much rwhp will the auto tranny take?
03-15-2013, 01:46 AM
#1
Instructor
Thread Starter
How much rwhp will the auto tranny take?
Wonder how much additional hp the new car will take. As you can see I don't have a Corvette yet, but it is one that I'm considering. The only thing is, it has to be an auto tranny for me because almost all the roads around me are either going up or down a little. I've used my left leg enough in the past. No more of that. I always mod every car I get, 450hp is just not enough. If the Z06 had an auto, that would be great, but I don't think its going to happen. Cecil..........
03-15-2013, 02:04 AM
#2
Le Mans Master
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It's likely going to be rated by GM around 480-500 BHP. This is pretty much what they always do. The transmissions usually are rated for about 50HP more than the car makes from the factory.
What it's ACTUALLY going to handle won't be known until the aftermarket guys get their hands on it. One of the selling points of the higher end models - in GM's case - is to make it seem that if you want to make more power (perhaps match or best the higher performance trim) you will need to spend the extra money to beef up the drive train too. Higher performance packages always come with the items that make it "beefier" overall.
I have no idea if the auto in the C7s will take a serious beating from higher power engines, but I'm going to guess you have some wiggle room at least up until 450-480 RWHP.
What it's ACTUALLY going to handle won't be known until the aftermarket guys get their hands on it. One of the selling points of the higher end models - in GM's case - is to make it seem that if you want to make more power (perhaps match or best the higher performance trim) you will need to spend the extra money to beef up the drive train too. Higher performance packages always come with the items that make it "beefier" overall.
I have no idea if the auto in the C7s will take a serious beating from higher power engines, but I'm going to guess you have some wiggle room at least up until 450-480 RWHP.
03-15-2013, 02:15 AM
#3
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Wonder how much additional hp the new car will take. As you can see I don't have a Corvette yet, but it is one that I'm considering. The only thing is, it has to be an auto tranny for me because almost all the roads around me are either going up or down a little. I've used my left leg enough in the past. No more of that. I always mod every car I get, 450hp is just not enough. If the Z06 had an auto, that would be great, but I don't think its going to happen. Cecil..........
03-15-2013, 02:26 AM
#4
Instructor
Thread Starter
Is this a new transmission or are they using one that has been around for awhile? I thought maybe its the one from the C6 and the people that have modded on it, would have a pretty good idea. Cecil.........
03-15-2013, 04:51 AM
#6
Team Owner
Or maybe even a version of the 6L90 (stronger/upgraded version of the 6L80 that's used in the Cadillac CTS-V and the Camaro ZL1). 
I have roughly 460hp (roughly 400 at the wheels) through my stock (other than the higher stall torque converter and auxiliary transmission cooler) 6L80 in my C6, no problems at all even with hundreds of wide open throttle drag strip passes.
03-15-2013, 09:15 AM
#7
Burning Brakes
Or maybe even a version of the 6L90 (stronger/upgraded version of the 6L80 that's used in the Cadillac CTS-V and the Camaro ZL1). I have roughly 460hp (roughly 400 at the wheels) through my stock (other than the higher stall torque converter and auxiliary transmission cooler) 6L80 in my C6, no problems at all even with hundreds of wide open throttle drag strip passes.
03-15-2013, 08:02 PM
#8
Le Mans Master
Callaway is running 600hp through the A6.
03-16-2013, 01:49 AM
#9
Team Owner
03-19-2013, 11:02 AM
#10
Former Vendor
Our C6 Auto packages do not go north of 700 horsepower without requiring a built tranny for us to do the build. Our Camaros/V's are on the same program.
I've got two more HPE700 LS3 Corvettes with automatics slated to roll out this month. Works fine with proper maintenance.
03-19-2013, 11:27 AM
#11
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Why would I do that?
Our C6 Auto packages do not go north of 700 horsepower without requiring a built tranny for us to do the build. Our Camaros/V's are on the same program.
I've got two more HPE700 LS3 Corvettes with automatics slated to roll out this month. Works fine with proper maintenance.
Our C6 Auto packages do not go north of 700 horsepower without requiring a built tranny for us to do the build. Our Camaros/V's are on the same program.
I've got two more HPE700 LS3 Corvettes with automatics slated to roll out this month. Works fine with proper maintenance.
03-19-2013, 06:25 PM
#12
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St. Jude Donor '13
Why would I do that?
Our C6 Auto packages do not go north of 700 horsepower without requiring a built tranny for us to do the build. Our Camaros/V's are on the same program.
I've got two more HPE700 LS3 Corvettes with automatics slated to roll out this month. Works fine with proper maintenance.
Our C6 Auto packages do not go north of 700 horsepower without requiring a built tranny for us to do the build. Our Camaros/V's are on the same program.
I've got two more HPE700 LS3 Corvettes with automatics slated to roll out this month. Works fine with proper maintenance.
03-19-2013, 06:35 PM
#14
Drifting
Talked with an engineer at the Sebring 12 hours and he stated it was going to be a "BIT" harder for tuners to play with the C7 engine and trans. tunes.
I was asking about making the C7 auto survive the roadcourse and he stated that is not the intent of the auto and its still a wet sump trans so sticky tires on a roadcourse will kill it.
I was asking about making the C7 auto survive the roadcourse and he stated that is not the intent of the auto and its still a wet sump trans so sticky tires on a roadcourse will kill it.
03-19-2013, 06:39 PM
#15
Le Mans Master
Talked with an engineer at the Sebring 12 hours and he stated it was going to be a "BIT" harder for tuners to play with the C7 engine and trans. tunes.
I was asking about making the C7 auto survive the roadcourse and he stated that is not the intent of the auto and its still a wet sump trans so sticky tires on a roadcourse will kill it.
I was asking about making the C7 auto survive the roadcourse and he stated that is not the intent of the auto and its still a wet sump trans so sticky tires on a roadcourse will kill it.
03-19-2013, 07:29 PM
#16
Drifting
I would have to agree that most C7 buyers would choke at the cost of a PDK or dual clutch trans. rebuild. It really is a different market vs Porsche, Ferrari, Lambo, ext.
His take, was the serious track guys could get a sequential if they were OK with those costs.
His take on the steps I took to keep the A6 cool were only a stopgap as the pump will cavitate under very hard braking and cornering.
03-19-2013, 08:28 PM
#17
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St. Jude Donor '13
As far as this guy was concerned not anytime soon. He stated high maintenence IE warrenty, high cost, weight and lack of torque holding as reasons.
I would have to agree that most C7 buyers would choke at the cost of a PDK or dual clutch trans. rebuild. It really is a different market vs Porsche, Ferrari, Lambo, ext.
His take, was the serious track guys could get a sequential if they were OK with those costs.
His take on the steps I took to keep the A6 cool were only a stopgap as the pump will cavitate under very hard braking and cornering.
I would have to agree that most C7 buyers would choke at the cost of a PDK or dual clutch trans. rebuild. It really is a different market vs Porsche, Ferrari, Lambo, ext.
His take, was the serious track guys could get a sequential if they were OK with those costs.
His take on the steps I took to keep the A6 cool were only a stopgap as the pump will cavitate under very hard braking and cornering.
Tadge Jeuchter said, about a year ago, that the current A6 would overheat under the high G loads of serious track use and that was why the dry sump engine was not available with the A6- the A6 would be the weakest link, not the engine oil system.
I don't know if he was referring to street tires or race rubber.
03-19-2013, 09:00 PM
#18
Drifting
Can you tell us what steps you took?
Tadge Jeuchter said, about a year ago, that the current A6 would overheat under the high G loads of serious track use and that was why the dry sump engine was not available with the A6- the A6 would be the weakest link, not the engine oil system.
I don't know if he was referring to street tires or race rubber.
Tadge Jeuchter said, about a year ago, that the current A6 would overheat under the high G loads of serious track use and that was why the dry sump engine was not available with the A6- the A6 would be the weakest link, not the engine oil system.
I don't know if he was referring to street tires or race rubber.
http://forums.corvetteforum.com/c6-p...ooler-kit.html
http://forums.corvetteforum.com/auto...-course-t.html
03-19-2013, 10:44 PM
#19
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St. Jude Donor '13
Thanks for the info!
If you used the best street tires but avoided race rubber, does it look like the stock LS3 and your A6 would last?
If you used the best street tires but avoided race rubber, does it look like the stock LS3 and your A6 would last?
03-20-2013, 12:25 AM
#20
Le Mans Master
TQ breaks things, HP burns things up. So, basically, if the tranny can stand the TQ of the engine, there is a way to put enough cooling on the tranny so that the HP will not burn it up.
That is, its not a question of HP but a question of TQ.
How much TQ can the gears take befor the teeth yeild?
How much TQ can the shafts take before they bend and break?
How much TQ can the case take before it distorts and allows unreasonable forces to act on the gear teeth and shafts?
That is, its not a question of HP but a question of TQ.
How much TQ can the gears take befor the teeth yeild?
How much TQ can the shafts take before they bend and break?
How much TQ can the case take before it distorts and allows unreasonable forces to act on the gear teeth and shafts?