6L90 TCC settings stock converter

[TransGo Robert]

If yes, seems I should turn off the lockup in all gear except 5 and 6 maybe.

If I may ask, why do you want the converter to lock when doing a WOT pull anyway?

[Cuz]

If I may ask, why do you want the converter to lock when doing a WOT pull anyway?

Honestly, I don't really know.

My tuner set it up this way for 1/4 mile racing. The stock tune attempts to lock up in WOT from 2nd gear onwards. My tune is from 3rd gear onwards. I understand this will have a higher 1/4 mile trap speed but not necessarily a quicker run.

[TransGo Robert]

Honestly, I don't really know.

My tuner set it up this way for 1/4 mile racing. The stock tune attempts to lock up in WOT from 2nd gear onwards. My tune is from 3rd gear onwards. I understand this will have a higher 1/4 mile trap speed but not necessarily a quicker run.

Fair enough, it just seems super odd to me, but I know nothing about racing. Lock-up in regular application is just for fuel economy, it is something you use only under light load so I was scratching my head as to why you would want that in the track doing WOT run. But maybe it does improve things if tuners do that.

[hjtrbo]

Ah, sux that shaft snapped, a dud tune will definitely do it, some people have no idea. Smoother is faster.

If you're serious about maximising your setup you're going to have to pay to play. Every set up is different, tyre choice, suspension, shift points, weight, torque curve the list goes on...

The only way for YOU to know is shell out some overtime money for hub dyno time to find your base settings to take to the track to do back to back testing on the strip.

Converter Locking Points (youtube.com)

[hjtrbo]

The lining is there in the picture, it is brand new, you just have to zoom in to see it because it is only 0.020" thick.

Fuck, that's an eye opener. Glad I'm not locking up anymore at WOT.

[TransGo Robert]

Fuck, that's an eye opener. Glad I'm not locking up anymore at WOT.

LOL, as the saying goes... Seeing is believing. ;-)

[chevy_man]

Fair enough, it just seems super odd to me, but I know nothing about racing. Lock-up in regular application is just for fuel economy, it is something you use only under light load so I was scratching my head as to why you would want that in the track doing WOT run. But maybe it does improve things if tuners do that.

Depends on the car.
If you have a good triple disk that's built to handle some abuse, you can pull higher speeds on the top end since you're eliminating converter slip. This also takes big power though. The guys I see doing this are generally running a TH400, and 2000+hp. They are basically grabbing another gear and gaining a few tenths and 20-30mph on the big end. It also shakes the car and feels like it's beating everything to death.


So yeah, not a great idea on a street build. Kick the TCC out above 90% as a standard rule.

[TransGo Robert]

They are basically grabbing another gear and gaining a few tenths and 20-30mph on the big end. It also shakes the car and feels like it's beating everything to death.

Thanks for explaining, I am always trying to understand better the racing world. Getting better top speed I get, but a few tenth is surprising to me just because I would think it would slow them down during the acceleration from not having torque multiplication during each shifts. Applying lock-up after the shift once the converter is starts coupling I get, but keeping it locked during the shifts is what makes me scratch my head. But hey, if they cross the finish line at a faster speed and sooner, then obviously I got it wrong and it does not matter on those mega powerhouse if they don't have torque multiplication helping after launch. Thanks again for the info!

[hjtrbo]

Thanks for explaining, I am always trying to understand better the racing world. Getting better top speed I get, but a few tenth is surprising to me just because I would think it would slow them down during the acceleration from not having torque multiplication during each shifts. Applying lock-up after the shift once the converter is starts coupling I get, but keeping it locked during the shifts is what makes me scratch my head. But hey, if they cross the finish line at a faster speed and sooner, then obviously I got it wrong and it does not matter on those mega powerhouse if they don't have torque multiplication helping after launch. Thanks again for the info!

Generally they only lock it in their last gear once the multiplication has gone.

This guy loves to lock up at the big end
https://youtu.be/cLm1se8-XO4?t=848

[TransGo Robert]

Generally they only lock it in their last gear once the multiplication has gone.

This guy loves to lock up at the big end
https://youtu.be/cLm1se8-XO4?t=848

Ok well that makes a lot more sense then. Thanks for the clarification.