What size stall is better?

[BadAzz240]

I have a 1997 Trans Am. What size of stall and brand do you guys recomend. I mean I can get an SLP 2800, 11" converter for $450. Then Theres the Vigilante 2800, 9.5" for like $800. Is it really worth it pay the extra money. They both claim to drop atleast 4 tenths. Or should I go another route? Or should I go with a 3000....well let me know your guys' opinions... Thanks

[FormulaLT1]

What mods do you have?

[BadAzz240]

3.42 gears, headers, exhaust, cutout, Moroso intake and elbow, lt4 knock module, pulleys, 52mm TB, TB Bypass, Programmer, MSD coil and wires, I have a set of drag radials on seperate rims also...a few suspension parts as well....I think thats it...

[BadAzz240]

What are some of the highest stall speeds you guys have heard of on LT1 cars. Say a guy had all bolt ons and wanted to put a 100 shot....What size would be best? What are some comboes your guys run?

[89IROC&RS]

stall speed is one of those things where bigger is not always better, especially if its a street car. Higher stall is acheived because the converter is designed to be in-efficient and allow slippage. This slippage will create higher crusing rpms untill the clutch locks up, if you have a locking converter, which will decrease gas mileage and raise the operating temp of the tranny fluid. these are both bad things. Im running a 2600 stall converter on my TPI 350 with headers and exhaust and it damn near gave me whiplash the first time i drove it. and thats with 2.77 gears. the stall is so high i actually have to put deeper gears in it for the tranny to shift right again.

If this is going to be pure race car, then yeah the 3000+ stall converters will make it launch like a mofo, if its gonna be your daily driver i wouldnt go above 3000, and personally im definalty happy with my 2600 stall.

[Xenostalgia]

Whats a stall converter? e.e;

[Hypsi87]

A stall converter is another name for a torque converter with the fins designed for a higher slip speed. Good for improving your launches

[hot_red_z28]

I was running a 3000 stall with all the bolt ons, 4.10 gear, and 150 shot of nitrous...

Now I have a new project, with a 4000 stall, 4.10 spool, and 250 shot of nitrous...

ideally you want the stall speed to be a tad below your dyno graphs torque peak... that will allow you to get the max power when you launch...

keep in mind that without a t-brake, converters will not stall as high as they are rated... for example, a 2800 stall will probably only foot brake to about 1800rpms... my 3000 foot braked to about 2100 rpms and my 4000 should foot brake to about 3000rpms...

-Garrett

[ct91rs]

I know a guy who ran a 3000 stall in a supercharged LT1, he used it as his daily driver, and he burned up the tranny three times...

[89IROC&RS]

that is a good point, anytime you swap to a higher stall like that, its almost a nessesity to install a second trans fluid cooler somewhere. High stall speeds raise fluid temps, which trannies dont like. Also remember to order a lockup converter if your car came so equipped, for highway driving it will lock up and negate the effect of higher stall on engine and tranny speed.

[hot_red_z28]

^ yep, with any stall upgrade, a tranny cooler is a must... even for a stock setup, a tranny cooler can greatly extend the life of your tranny...