Torque Convertors

[Scoobum]

Found a post from Paul from last year. 4100 for a 1.4x launch.

[nocooler]

Most people don't know how violent these cars can become with some low gear timing and fuel adjustments. 

My 9/11 was terrible inefficient and had to be locked.

[Steve Wood]

Mine was too....terribl e...I thought it was a bad converter...an d eventually it broke so I was right

[Scoobum]

A source I trust says the Pro Torque 10.5 in LU with the Kevlar clutch can withstand being locked at WOT and is good for 4mph on a 10 second combo.

[reality]

As compared to what?

[Scoobum]

As compared to what?

No comparison was made.

[reality]

Where did the 4 mph figure come from then?

[earlbrown]

locked .vs unlocked

[good2win22]

Everyone I've spoken with is saying that once you reach the 11.0-ish ET, locking the converter will only slow you down and tear things up inside the tranny.  At least on a 200R4.  I'm not certain of the new technology inside the converter.  I can tell you that the lock up converter I had from Jake had no heat marks on the clutch surface or the mating surface of the converter but the clutches were worn and the steels were discolored on the high gear set. I had 11 passes on that tranny.


I have no experience as to the lock up side of things going slower or faster but I can tell you that my tranny was hurting by locking it up at my power level.

[TexasT]

What did you go with for direct clutches the second time? Were more clutches added? Did Jake use the thicker steels? Lots of things can be "fooled" with inside the trans and converter.

I'm not a believer in locking the converter. Just too hard on it imo. To me that lock up is for cruising and not accelerating and that is how gm designed it. Those multi disc units just add weight and I'm not sure they work, but I've never tried one out. They sure sound like $h/t. If I had a dedicated track car I would go non l/u. Plenty of tech these days to get it launched and be tight on the big end. 

[Scoobum]

Each time I've had my transmission freshened up over the years it's been the high gear clutch pack that's been worn. The rest has had minimal wear. NL convertors are the way to fly. Guys buy LU convertors and then immediately ask why their MPH is off at the traps. Torque convertor selection is the most important piece of the puzzle...and most get it wrong.

[Joe Buick]

I will add another criteria.  If it costs less than $900, it probably is not worth installing....

You got that Fxxx right!

[nocooler]

Here is a good post I came across. Slip isn’t always everything.
http://www.yellowbullet.com/forum/#/topics/2121025?page=4

[Steve Wood]

Here is a good post I came across. Slip isn’t always everything.
http://www.yellowbullet.com/forum/#/topics/2121025?page=4

it took me to the forum home and not to the post...what section is it in?

[nocooler]

Odd - takes me straight there. It’s under the transmission section, when to use a lock transmission or torque converter. None of us make the power to need a lockup transmission, but all the info is good