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Anyone know of a vendor that sells high performance torque converters using factory stall speeds? I'm a track rat with the A-6 so heat is always an issue - even with GSpeed coolers. I know Circle D makes a performance TC but the lowest stall speed they have is 2600. Would this be an issue on a road race course or am I overthinking this?
Thanks!
I don't think 2600 would cause extra heat as it's not hugely different than stock. I know what you mean though heat is the enemy out there and I'm also having to use autos.
Three thoughts on this problem.
1. Check to see if the converter for trucks (same trans of course) have lower stall speeds to reduce heat.
2. Overfill your trans by 1 to 2 quarts to create more volume to contain heat.
3. Add a second cooler to provide both extra volume and cooling capacity.
Here's an adapter I made to rear mount a cooler. You could put T fittings in it to run 2 coolers or 1 really large cooler. It's your's for the asking.
BTW, the Vette geezer group meets for lunch at Coco's restaurant on Bell rd every Tuesday 12:15 - 12:30.
HOXXOH, Thanks for the thoughts! I hadn't thought about a TC from a truck for a lower stall speed, it's all about torque so that makes sense if the TC is built more ruggedly than a car version. I thought about running a deeper oil pan for the transmission.LG motorsports makes one with a +2 quart capacity that is supposed to fit the Corvette transmission. I also found a finned one from B&M for the 6L80E but it is for a different case - for pickup trucks. You probably already know the cases are different for the Corvette than for the conventional version of the 6L80E.
Adding a second cooler is a good thought too, I have a couple of ideas in that regard. The other heat source would probably be the differential so a diff cooler is also in the works. The question is which way to go with one. DRM makes an electrical pump type and LG Motorsports has a mechanical pump version.
Thanks for the reminder for the Geezers! I really get caught up in projects at home and forget, this time it will go into my calendar. It would be great to see you.
-Mike
Is the truck converer compatible with our rear mounted transmission?I thought the Corvette converter was different due to the transmission location.
COULD be, but don’t know for certain, one would have to look at the dimensions to be sure, and don’t forget the spline count. I have think there are better solutions than a 6L90 convertor though. As mentioned, Sonnax has made components available that addresses shortcomings in the OEM version for the C-6 and there is a company in Florida using those components in their refurbished units. I don’t know if the stall speeds remain the same and will find out Monday. There are probably others and a call to Sonnax is needed to discover who is making them.
The way I look at it is I would rather have an enhanced OEM TC with stock stall speeds for road track use than a higher stall converter. Heat generation is the driving issue. Drag racing is an entirely different approach as most people know.
Last edited by mikeCsix; Nov 18, 2023 at 03:06 PM.
Anyone know of a vendor that sells high performance torque converters using factory stall speeds? I'm a track rat with the A-6 so heat is always an issue - even with GSpeed coolers. I know Circle D makes a performance TC but the lowest stall speed they have is 2600. Would this be an issue on a road race course or am I overthinking this?
Thanks!
My C5 auto has a yank 3200, 3.73 gears, tranny cooler. I’ve done HPDE with no problems, highest the trans temp hit was 228. Yank3200 hardly has any converter whine with the 3.73 gears. I don’t know much about circle D, but the YankSS is perfect for me. Gives the C5 auto a nice improvement off the line too coupled with the 3.73’s.
Is the truck converer compatible with our rear mounted transmission?I thought the Corvette converter was different due to the transmission location.
The companies I’ve talked to so far have not made a distinction, for sizing, it seems the smaller diameter converters have higher stall speeds than the larger, stock seems to be 300mm diameter. What may be a determinant for Corvette is the number of splines for the input shaft, I believe Corvette is 36 from all I’ve read.
My C5 auto has a yank 3200, 3.73 gears, tranny cooler. I’ve done HPDE with no problems, highest the trans temp hit was 228. Yank3200 hardly has any converter whine with the 3.73 gears. I don’t know much about circle D, but the YankSS is perfect for me. Gives the C5 auto a nice improvement off the line too coupled with the 3.73’s.
In the Southwest, heat can be a factor. I’m trying to keep temps down to 185 and so far have achieved that goal with my GSpeed coolers. So my target stall is 1800 - 2000 rpms, I’m looking for a triple disk lockup, billet front cover, and heavy duty pistons, checklist items the high performance converters seem to have. Check out Sonnax who make upgraded components for both transmissions and TC’s.
My C5 auto has a yank 3200, 3.73 gears, tranny cooler. I’ve done HPDE with no problems, highest the trans temp hit was 228. Yank3200 hardly has any converter whine with the 3.73 gears. I don’t know much about circle D, but the YankSS is perfect for me. Gives the C5 auto a nice improvement off the line too coupled with the 3.73’s.
20 min sessions on a hot day? I've used autos on tracks for a lot of years and haven't noticed stall speed playing a roll in heat. But I didn't specifically check that either.
High Performance torque converter
