Low inertia 258 mm looser 6L80E replacement torque converters
02-07-2008, 02:34 AM
#1
Former Vendor
Thread Starter
Low inertia 258 mm looser 6L80E replacement torque converters
We have installed several of these torque converters in customer vehicles and now we are offering them for sale to our mail order customers as well.
These torque converters are for the 6L80E six speed automatic transmission found in the 2006-2008 C6 Corvettes.
The torque converter is a 258 mm diameter design torque converter so it is over 40 mm smaller in diameter than the production 300 mm diameter torque converter. This significant reduction in diameter provides a noticeable difference in weight and inertia, providing for faster engine acceleration and throttle response.
This torque converter is also designed to be roughly 13% looser than the stock torque converter, allowing you to get up into the power band sooner, further improving vehicle performance.
Although "looser" than the stock converter, this converter still maintains very good driveability for every day use.
The torque converter features a twin plate torque converter clutch so despite the smaller diameter, it doesn't sacrifice torque converter clutch capacity (stock torque converter clutch is a single plate design).
Works with the factory calibration - no calibration changes required.
Fits: 2006-2008 C6 Corvettes equipped with the 6L80E 6 speed automatic transmission
These are brand new torque converters, not rebuilds or modified stock units.
Image of the converter:
The torque converters are $499.95.
Link to the eBay store listing.
These torque converters are for the 6L80E six speed automatic transmission found in the 2006-2008 C6 Corvettes.
The torque converter is a 258 mm diameter design torque converter so it is over 40 mm smaller in diameter than the production 300 mm diameter torque converter. This significant reduction in diameter provides a noticeable difference in weight and inertia, providing for faster engine acceleration and throttle response.
This torque converter is also designed to be roughly 13% looser than the stock torque converter, allowing you to get up into the power band sooner, further improving vehicle performance.
Although "looser" than the stock converter, this converter still maintains very good driveability for every day use.
The torque converter features a twin plate torque converter clutch so despite the smaller diameter, it doesn't sacrifice torque converter clutch capacity (stock torque converter clutch is a single plate design).
Works with the factory calibration - no calibration changes required.
Fits: 2006-2008 C6 Corvettes equipped with the 6L80E 6 speed automatic transmission
These are brand new torque converters, not rebuilds or modified stock units.
Image of the converter:
The torque converters are $499.95.
Link to the eBay store listing.
02-07-2008, 04:55 AM
#2
Team Owner
I know there are no real definitive answers when it comes to stall as there are too many factors involved that can alter it but any idea what the basic stall range and STR (stall torque ratio, 2.2, 2.5 etc?) would be on this converter (2800, 3200 etc?)? Or is it available in various stalls?
Price seems pretty reasonable.
Price seems pretty reasonable.
02-07-2008, 06:28 AM
#3
Pro
Member Since: Feb 2006
Location: VA
Posts: 690
Likes: 0
Received 0 Likes
on
0 Posts
I know there are no real definitive answers when it comes to stall as there are too many factors involved that can alter it but any idea what the basic stall range and STR (stall torque ratio, 2.2, 2.5 etc?) would be on this converter (2800, 3200 etc?)? Or is it available in various stalls?
Price seems pretty reasonable.
Price seems pretty reasonable.
Sounds like a 2600 or so w/ 1.7-1.8str, but I`m pulling that out of you know where...
02-08-2008, 02:43 PM
#5
Safety Car
Member Since: Sep 2006
Location: Cheektowaga NY
Posts: 3,918
Likes: 0
Received 3 Likes
on
3 Posts
St. Jude Donor '08
I know there are no real definitive answers when it comes to stall as there are too many factors involved that can alter it but any idea what the basic stall range and STR (stall torque ratio, 2.2, 2.5 etc?) would be on this converter (2800, 3200 etc?)? Or is it available in various stalls?
Price seems pretty reasonable.
Price seems pretty reasonable.
02-08-2008, 10:31 PM
#7
Melting Slicks
Jason,
Nice to see someone on top of the A6. It a complex trans and many are intimidated by it. We are have a few 08's coming in shortly for power upgrades and this is a nice addition.
Any issues with the TCM?
Howard
Nice to see someone on top of the A6. It a complex trans and many are intimidated by it. We are have a few 08's coming in shortly for power upgrades and this is a nice addition.
Any issues with the TCM?
Howard
02-10-2008, 07:52 PM
#9
Former Vendor
Thread Starter
More specifications
Sorry but I don't have STR data on this torque converter.
On a stock LS2 engine this torque converter should stall roughly 200 to 300 rpm higher than the stock torque converter.
On a stock LS2 engine this torque converter should stall roughly 200 to 300 rpm higher than the stock torque converter.
I know there are no real definitive answers when it comes to stall as there are too many factors involved that can alter it but any idea what the basic stall range and STR (stall torque ratio, 2.2, 2.5 etc?) would be on this converter (2800, 3200 etc?)? Or is it available in various stalls?
Price seems pretty reasonable.
Price seems pretty reasonable.
Last edited by jhaines; 02-10-2008 at 10:02 PM. Reason: Typo error
02-10-2008, 07:53 PM
#10
Former Vendor
Thread Starter
Tcm
No, you shouldn't have to make any TCM changes to use this torque converter.
Jason
Jason
02-10-2008, 08:03 PM
#11
Former Vendor
Thread Starter
Another 258 mm torque converter
We should soon have another even looser 258 mm torque converter available for people that want something with an even higher stall speed.
It will retain the same weight/intertia advantages of the other 258 mm converter and will also be a dual plate torque converter clutch.
This one will be a little over 44% looser than stock so it should cause the engine to flash an rpm roughly 600 to 900 rpm higher than stock.
The price on that converter should be similar to the one I listed previously.
I will post here when it is available (probably a week or two).
This
It will retain the same weight/intertia advantages of the other 258 mm converter and will also be a dual plate torque converter clutch.
This one will be a little over 44% looser than stock so it should cause the engine to flash an rpm roughly 600 to 900 rpm higher than stock.
The price on that converter should be similar to the one I listed previously.
I will post here when it is available (probably a week or two).
This
03-18-2008, 12:12 AM
#13
Former Vendor
Thread Starter
Stall torque ratios on new 6L80E torque converters
Sorry it took me so long to get this information.
The stall torque ratio of the stock 2006-2008 C6 Corvette AT is 1.87.
The stall torque ratio of our 15% looser (200-300 rpm+), 258 mm diameter torque converter is 1.69.
The stall torque ratio of our 45% looser (600-900+ over stock), 258 mm diameter torque converter is 1.94.
Both are twin plate clutch torque converters.
The stall torque ratio of the stock 2006-2008 C6 Corvette AT is 1.87.
The stall torque ratio of our 15% looser (200-300 rpm+), 258 mm diameter torque converter is 1.69.
The stall torque ratio of our 45% looser (600-900+ over stock), 258 mm diameter torque converter is 1.94.
Both are twin plate clutch torque converters.
I know there are no real definitive answers when it comes to stall as there are too many factors involved that can alter it but any idea what the basic stall range and STR (stall torque ratio, 2.2, 2.5 etc?) would be on this converter (2800, 3200 etc?)? Or is it available in various stalls?
Price seems pretty reasonable.
Price seems pretty reasonable.
03-18-2008, 09:01 PM
#15
Former Vendor
Thread Starter
Torque converter question
The torque converter continues to make a difference even once you are moving. The only time the torque converter is "mostly" out of the equation is when the torque converter clutch is locked up (in torque converters that have lock-up clutches) and you no longer should have any torque converter slip (and thus no torque multiplication). This happens once you are moving at partial throttle with the speed, load, temperature etc. that this happens at depending on the vehicle and calibration.
At wide open throttle the torque converter is usually only locked above a certain vehicle speed and in many vehicles the torque converter never locks at wide open throttle.
The gains from a looser converter come from it allowing the engine to be higher in the power curve sooner (and presumably for a longer period of time). The looser converter does waste some energy but the losses are usually counter acted by the larger gains from being at a higher power point in the rpm range of the engine. It is possible to have too loose a torque converter for a given engine/vehicle/track combination (but these two torque converters are very far from that side of the torque converter selection range). Very loose torque converters tend to also hurt low speed driveability and tend to create additional transmission heat (when the torque converter clutch isn't locked, if applicable).
Even when the torque converter clutch is locked (so you should have no slip and no torque multiplication), since these 258 mm torque converters weigh less and have less inertia than the stock 300 mm torque converters, you are going to get an acceleration improvement just from the reduction in static vehicle mass and due to the reduced energy consumed accelerating the inertia of the torque converter (not too different from going to an aluminum flywheel or small diameter clutch in a manual transmission vehicle).
At wide open throttle the torque converter is usually only locked above a certain vehicle speed and in many vehicles the torque converter never locks at wide open throttle.
The gains from a looser converter come from it allowing the engine to be higher in the power curve sooner (and presumably for a longer period of time). The looser converter does waste some energy but the losses are usually counter acted by the larger gains from being at a higher power point in the rpm range of the engine. It is possible to have too loose a torque converter for a given engine/vehicle/track combination (but these two torque converters are very far from that side of the torque converter selection range). Very loose torque converters tend to also hurt low speed driveability and tend to create additional transmission heat (when the torque converter clutch isn't locked, if applicable).
Even when the torque converter clutch is locked (so you should have no slip and no torque multiplication), since these 258 mm torque converters weigh less and have less inertia than the stock 300 mm torque converters, you are going to get an acceleration improvement just from the reduction in static vehicle mass and due to the reduced energy consumed accelerating the inertia of the torque converter (not too different from going to an aluminum flywheel or small diameter clutch in a manual transmission vehicle).
03-20-2009, 03:23 PM
#17
After my tune, this will be my next mod. I have not even paid attention to what the stock converter stalls at though. Anyone know? I am looking for a max stall of 2600 so which converter should I lean to. I believe the 2nd one with the 600-900 extra rpm. I'm not sure how to figure out the SR math. 
03-20-2009, 03:27 PM
#18
Pro
Member Since: Sep 2007
Location: S. Jersey .............. Low 11sec club
Posts: 747
Likes: 0
Received 0 Likes
on
0 Posts
St. Jude Donor '11
After my tune, this will be my next mod. I have not even paid attention to what the stock converter stalls at though. Anyone know? I am looking for a max stall of 2600 so which converter should I lean to. I believe the 2nd one with the 600-900 extra rpm. I'm not sure how to figure out the SR math.
03-20-2009, 03:30 PM
#19
Pro
Member Since: Sep 2007
Location: S. Jersey .............. Low 11sec club
Posts: 747
Likes: 0
Received 0 Likes
on
0 Posts
St. Jude Donor '11
Sorry it took me so long to get this information.
The stall torque ratio of the stock 2006-2008 C6 Corvette AT is 1.87.
The stall torque ratio of our 15% looser (200-300 rpm+), 258 mm diameter torque converter is 1.69.
The stall torque ratio of our 45% looser (600-900+ over stock), 258 mm diameter torque converter is 1.94.
Both are twin plate clutch torque converters.
The stall torque ratio of the stock 2006-2008 C6 Corvette AT is 1.87.
The stall torque ratio of our 15% looser (200-300 rpm+), 258 mm diameter torque converter is 1.69.
The stall torque ratio of our 45% looser (600-900+ over stock), 258 mm diameter torque converter is 1.94.
Both are twin plate clutch torque converters.