Torque convertor
I'm looking to upgrade my trans, and since I'm running a SY3500, I thought I might need to change to a triple disc.
I was told this particular TC dove JUST LIKE stock, until you got into it, so was looking for feedback.

Are you referring to a lockup you can feel at part throttle (feels like it's shifting into another gear?) or is there something "annoying" maybe because it's a triple disc?
I have a SY3500 and my wife has a 3200, and neither are real "tight" off of the line, but I thought of swapping because;
1. I had the power that required a triple disc.
2. With the blower torque and power, I didn't really need a 3500 stall
3. The owner said it was MUCH closer to stock than the ones he has had in the past, and really felt like stock.

PI converters really are ~400 rpm higher then advertised and they do feel loose compared to stock like they should.
Will you like it? YES! Drive like stock? NO!

Will you feel the lockup? YES!

PI converters really are ~400 rpm higher then advertised and they do feel loose compared to stock like they should.
Will you like it? YES! Drive like stock? NO!

Will you feel the lockup? YES!

Do you feel the lock you at full throttle or just part throttle?
I've run lock up converters in several vehicles, but I'm a little confused on the "lock up bump" being described unless it's at part throttle and feels like a "4th" gear shift.
Are you getting good lock up with the triple disc as compared to what a single disc would give with the blower power level?
Last edited by Chris Stewart; May 24, 2010 at 05:48 PM.
1. I was TOLD that with the hp and tq the blower delivers, I have, the single disc just wouldn't be strong enough.
2. I wanted to reduce the stall a little and increase the "multiplication ratio" to make it tighter on the street, and keep from blowing away my tires when I launch
If I understand what you're saying, since it doesn't lock during a race, what difference does it make if it has three disc or one.
The Best of Corvette for Corvette Enthusiasts

PS: No regrets, just questioning if it's really "needed" or just nice to have.
Last edited by Chris Stewart; May 24, 2010 at 08:45 PM.
Do you feel the lock you at full throttle or just part throttle?
I've run lock up converters in several vehicles, but I'm a little confused on the "lock up bump" being described unless it's at part throttle and feels like a "4th" gear shift.
Are you getting good lock up with the triple disc as compared to what a single disc would give with the blower power level?
This never occours at WOT unless you program for it in your tune, some drag racers do it in third gear to go through the traps at 1:1 trans ratio.
With a stock converter the difference between lockup and open is about 2-3% with a aftermarket higher stall speed it can be somewhat more.
I did have a single disc in my 2600 Vig. before and found it slipped under part throttle, again it depends how your car is programed most people leave the unlock portion stock so you can never apply much torque into the clutch when it's locked. I found this to be annoying because it would unlock at the slightest throttle input.
I also have mine set up to apply at WOT in 4th gear (never tested it but it's there).
Stall speed is the theoretical speed which the stator and turbine inside the converter reach 1:1 or as close as they can become. (ie.2600)
However this is also determined by outside factors, vehicle weight, axle ratio, gear ratio in the transmission, and engine torque.

Clear as mud, I thought so...

I've programmed my TCC (HPTuners)to lock up in 3rd and 4th at WOT but it always unlocks when I hit the gas.
Also, the TCC will always unlock when the trans shifts on a C5.
So I wired the TCC so it could be locked with a switch. Now I can lock it in 1st, 2nd, 3rd, and WOT.
I have a single disc 2600 stall which is very close to stock, just slightly looser - which I needed due to the higher idle.
I've run WOT and locking the TCC at least 100 times.
Your TTC will always unlock at WOT (unless you lock it manually like I do) so what good is a 3 or 5-disc TCC?
In other words, the pcm unlocks the TCC as soon as it sees any power from the engine. The stock tcc is designed to give a smooth engagement and could never handle WOT pulls.
Most converter vendors won't guarantee it if you lock it at WOT anyway.





Now I've got the same converter in a Camaro SS with 3.73 gears and it feels much better, pedal response is closer to stock, but the engine still revs up obviously.














