Does a stall converter always slip?

Synned · Jul 12, 2005

My question is..does a stall converter always slip a little? Lets say you eased on the throttle, do you actually get anywhere till 2800 rpm or so? Does it feel a lot slower than stock or does it not slip unless your applying brake pressure?

Synned · Jul 12, 2005

EXTRPR50 · Jul 12, 2005

Id like to know myself, is there a thread already posted for this?

Synned · Jul 12, 2005

Nobody knows?

mo_dingo · Jul 12, 2005

A torque converter has 2 plates w/ fins on it, that look similar to a heat sink. The engine is directly attached to the "front" plate. It spins that all the time (while running of course). Now, the stall speed is determined by how many fins and their relative size to each other. As the engine revs higher and higher, it spins the front plate at 1:1 ratio. Depending on the stall speed of the converter, that determines the RPM that the rear plate will spin, which turns the transmission. The rear plate is fixed to the transmission and spins with it all the time.

If you have a 2800 stall, you can put the transmission in drive, and rev to 2700, and the car will start to move, but it won't fully engage until you reach the 2800 mark. The closer you get to the 2800, the more it will want to move the car.

When you hold the brake, it is slipping the torque converter, which prevents the engine from stalling.

Hope this helps.
Scott

Synned · Jul 13, 2005

So for daily driving street car it looks like a 2400 stall is my best bet.. I mean i dont wanna be sitting at a light and it turn green and have to go up to 2800 before I go anywhere..

Swarzkopf · Jul 13, 2005

No no no...you've got it wrong man.

The car will move before 2800, it just isn't fully engaged (locked up) before then.

Stock AODE's have a relatively high stall speed, I believe it's around 2400.

sage2k · Sep 27, 2005

so on the interstate at 70mph and 2200rpm my trq converter will still be slipping?
wont this hinder gas mileage and power?

divit250r · Sep 27, 2005

If your car has AOD or AODE, it should have a lockup converter stock. That means that once all the sensors, computer, etc. decide it's ok, it locks together, basically like a clutch. It probably doesn't happen until after around 45 MPH with stock gears. At least that's how my 94 F150 and my 01 F250 automatics work.

Scott

OinkAodeOink · Sep 27, 2005

yea, the trans will lock up.. Hell my stock convertor locks up around 33mph ( 4th gear).. You can def feel it, as it feels like a 5 speed car.

Even taking off from a light, the car will go just fine, like normal.. It will just take a tad more throttle and feel kind of sluggish, until you hit the rated stall speed., or whatever it stalls at on your car. It's nothing like you would imgine.. the car wont have to be reved like hell just to move, lol.

sonicblue87lx · Sep 27, 2005

Yea i have a 2500 Stall on my car and its just like a normal car.. but once you hit taht 2500 mark you full the power kick right into play. But I do know alot of people who think when you say Stall that the car wont move untill you hit that rpm..

Although When im in o/d I was told not to slam on the gas cuz it will just spin the convertor i was told if i want to just floor and go to take off the o/d. But if im on the express way i can feel that gear kick in then i can just go with it then.. Its wierd if you ask me but no less I like the convertor

90bronconate · Sep 27, 2005

sonicblue87lx said:
Although When im in o/d I was told not to slam on the gas cuz it will just spin the convertor i was told if i want to just floor and go to take off the o/d. But if im on the express way i can feel that gear kick in then i can just go with it then.. Its wierd if you ask me but no less I like the convertor

umm don't think that's right. it doesnt' matter if your o/d button is on and you floor it from a stop. the button just allows the trans to go into o/d when it needs to. you're just not supposed to use o/d as an accelerating gear. so you shouldn't floor it, top out 3rd and let it shift into fourth when you're still flooring it because it's a cruising gear and isn't strong enough for that... that's just what i've heard, but it makes sense.

sonicblue87lx · Sep 28, 2005

No I agree with you.. It didnt make sence when I was told it either. When my car it in for the tune im going to talk to the guy about it and see what he says

95Vert · Sep 28, 2005

Good read.

Black95GTS · Sep 28, 2005

95Vert said:
Good read.

+1 I always wondered how that worked. The automatic transmission is like the dark side for me.

95Vert · Sep 28, 2005

I'm leaning towards getting the 4R70W. How much do you guys think that tranny can handle? (no hijack intended)

95Vert · Sep 28, 2005

I was also told not to slam on the gas while in OD. The reason being is that the OD band on our trannys are week as crap. Let the belt disengage and then let it rip. Extends the life of that crappy OD belt.

ccoypat · Sep 28, 2005

I have an Edge

I installed a custom built Edge 9" 2870 stall (lock-up/2.42 stator) TC in my car about six months ago. You can tell the difference when you first accelerate (slowly) from my stock one. You move when you press the accelerator just like a stock converter, but you can tell it is not fully engaged until it hits 2870RPM. Almost like it slightly drags. It took some getting used to. Other than that and WOT, you won't tell too much of a difference from you stock converter in daily driving.

Later

sage2k · Sep 29, 2005

ccoypat said:
I installed a custom built Edge 9" 2870 stall (lock-up/2.42 stator) TC in my car about six months ago. You can tell the difference when you first accelerate (slowly) from my stock one. You move when you press the accelerator just like a stock converter, but you can tell it is not fully engaged until it hits 2870RPM. Almost like it slightly drags. It took some getting used to. Other than that and WOT, you won't tell too much of a difference from you stock converter in daily driving.

Later

What gains did you get from that converter?
Did you lose any mpg?

ccoypat · Sep 29, 2005

sage2k said:
What gains did you get from that converter?
Did you lose any mpg?

As far as gains, I can't give you any track times or dyno results, but it was like the difference between night and day. A 2.42 stator provides a huge torque gain. After doing it, I wouldn't recommend it with a stock AODE (More to follow on that as I work through some of my issues).

I didn't notice a difference in mpg. I did take a 1500 mile trip recently and got a little over 25 mpg. I didn't take a trip with the old converter so I have nothing to compare it to. I live about 5 miles from work with a max speed limit of 35 mph in between. I didn't notice any change in mpg.

I can tell you that Edge was great! I gave them my specs/mods and within a week they had my custom built TC at my house (I do live in Cali). I couldn't be more happy with it. I read some posts here and decided to go with Edge.

Later

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