tranny, stall convertor question?

[m2g4b]

alright here we go.....my car has had some work done to it before i purchased it, dont know if the tranny has been programmed, shift points, harder shifter or if a shift kit has been installed or more, but its NOT stock!!!! anyway, how does a stall work? the reason I am asking is all I know is that a stall lets you raise the idle more before the car actally tries to take off, I think? anyway, under normal driving conditions if you have a stall will it feel like there is a lag when you just take off normal from a stop? it almost feels like slippage, but it just like 200 rpms then takes off, just normal stop and go....is my tranny going out, or possibly have a stall in it? also, i really havent tried to see how far i can sit and stall it up before the wheels turn, but its somewhere in the neighborhood of 1500 rpms or so, if that helps??? thanks in advance!!!!

[mrcadillac]

some high stall convertors will "lag" off the line, but most of the high quailty ones you won't really notice. In normal driving, alot will go un detected. but mash it, and the rpms will climb before i takes off. But when it does, it takes off hard. due to there being more torque right there. More weight, more power, and less rear gear(say 2.73 vs 3.73) will all slightly raise the stall speed. It pretty much slips until the determined stall speed, then engages (kinda) hard. It doesn't feel like slipagae, it IS slipage. It's designed to do that. But the slip is in the convertor, not in the apply bands.

The only advantage of a high stall isn't just to raise the idle, like for a bigger cam. But more so to cut your 60 ft times drag racing, by letting you enter the power band sooner.

Stand on the brakes, and see how high it will stall. My cadillac was around 1400. but thats stock, weighing 4485lbs with me(I'm only 150lbs). my buddy with a 2800-3200 edge can get his to around 2800 with drag radials. That will help determine if the stall is stock.

A shift kit should not effect the "lag" off the line. nor programing.

So as for your trans, I'm not sure. But it really sounds like a higher stall. Our Limos do the same thing, even tho they have the exact drivetrain as our sedan town car. the added weight bumps the stall up a bit, which in turn helps them off the line.

Make sence?

[LS13RDGEN]

How does a stall work?

The simplest way I can explain it is this:

MAGIC!

:roflmao:

Ok just kidding.

Let's say you have two basic identical fans. Like the kind you might have on your desk to cool you off.
Allright?
With both fans turned off, face them towards eachother. Plug one fan in and turn it on. As the fan begins to spin, the fan with no power will slowly begin to turn as well. Eventually it will pretty much reach the same speed as the fan that is turned on.
The fan that is turned on is your engine. The fan that was turned by the spinning of the "on" fan is your transmission.
This is essentially what happens in a torque converter. Instead of air being forced to turn the fan blades, it is fluid that is used.
Let's say that you locked the two fans together. Now they will both spin at exactly the same speed that is set by the "on" fan. That is when the converter locks up.
By changing the size of the fan blades, they change the size of the stall.
The smaller the fan blades, the faster the engine side of the two sets of blades has to spin in order to move the transmission side of the blades.

Hopefully that will shed some light on the mystery of how it works. :D

[mrcadillac]

:bs: J/K!

Very well put. :thumbsup:

[LT ONE]

dang that was really good answer (500)points

[Zupercharged28]

wow. yea bonus 20 points for getting ME to understand. thats almost impossible!

[LS13RDGEN]

No prob.
I know it helps me to understand things if I put them in a scenario where I can relate. :D

Unfortunatley there is no way to use this mode of thinkiing when it comes to explaining women. :(

[Zupercharged28]

here one. women are crazy. THE END!!

[ricksterlt4]

how doi know if i have a stock or an upgraded stall ?????

[Zupercharged28]

figure out the stock stall speed for your vehicle and then see what your car stalls at! orrrr you could take off your bellhousing and take a looksee

[Chris 96 WS6]

Actually it is the pitch of the blades that is used to change the stall speed, not the size of the blades.

[04redgoat]

Hi, I am a new member. I read the post about the stall torque converter. I have a question regarding this. I have 04 GTO automatic, In two weeks i am going to have a mid cam kit,off road headers,& 3000-3200 stall torque converter installed. I still don't understand fully about the torque converter. If I am at a full stop & gradually speed up to 40 mph with the 3200 stall torque converter installed, Will the car move once the rpm gauge reaches 3000 or 3200 rpm or how will the car react under this normal type of accerlation. Will i loose gas mileage significantly under normal driving conditions aside from loosing the gas mileage that comes with installing the mid cam kit? :rolleyes: