Torque converter stall speed question...
 

Hi guys,

I read so many articles regarding torque converter stall speed but I still have some concerns.

My main question is, what is the difference between, for the example, 1200rmp and 2800rpm stall speed converters?

As I understood, first converter will be fully engaged after 1200rpm, and the other after 2800rpm. So, if I never have a need to race with the car with left foot on brake pedal and right on the gas pedal, I will only see difference in fuel consumption between two of them?

Also, if I started from stop light "normally" with using only right foot (depress brake pedal and press gas pedal), the car will be quicker with 1200rpm stall converter because it will be sooner fully engaged?

Am I right or I missed something? :)

Thanks to all in advance.

iam not a trans expert. but i have had a 500 in race engine with a 2800 stall. IMHO. you will NEVER get as good of MPG with the 2800. over all just use a 1200 stall on a mild engine. and a 2800-3200 stall on a race engine. the experts here can give you more details on the fine points.

The higher stall converter allows the engine to get in it's power band sooner IT also allows the engine to idle against the engine speed with out stalling.
If you have a 2800 stall speed converter and run down the road at 2800 RPM the converter would be locked up and be more efficient

shone -

What TV said. The purpose of playing with the stall speed is to get the engine to "flash" into it's power band (where it becomes the most efficient) as quickly as possible. That most important for drag cars, where you want the most power to the ground from start to finish.

For example, my engine's power band is roughly 3000 to 6000 rpm. I choose a 3000 stall converter. When I was racing, the thing flashed to about 3000 and took off. On the street, when you're not punching it, the 3000 stall can feel a little sluggish, if your rear end gears don't get you the rpms up fast enough.

So, it's the same two questions, what does the engine want and what do you want?

Archer

My question has nothing with drag racing, imagine that my grandmother drive the car for the example :)

shone -

If the engine is stock, you or your grandmother will be happier with a stock 1200 stall converter. The problem with higher stall converters is the "spool up" time. That's not an issue when you're punching it off the line, but may make the the car feel sluggish for grocery getting.

Without engine mods and high rear gear ratios, stick with a stock stall speed converter.

Archer

All this advice is right on the mark.
Mopar is one of the few who offerd..IMO one of the most thought out,sweet sweet stalls. 2000rpm, remember with a stall thats the minimum rpm u will turn.
for instance my combo 318 518 390 2000 stl. With lock up. Every where I travel she spins 2000 rpms ...up to 45mph . My cam starts at 2200rpm so at the light hit the gas and...swooosshh im gone . Not a abrupt bang or hard launch such as u would get from higher stalls .
This is a well thought out design from mopar and I HIGHLY RECOMEND IT ...
you can purchas one from a local trans supplier/remanufacturer for around $100.
Its the greatest thing when I leave a stp light at my normal.moderate peddleI got 5_8 car leangths on the traffic and thats not harsh stall its a very nice streetable stall gaurenteed.

here is an EXTERANL filter, i found. have one on my 01 dak. my idea is when you put a new filter in side this one will help from having to do the inside one as often.
the old auto zone 2210 magenfine filter is no longer available at auto zone. BUT i did find the same thing as JX-160 brand-- ATP. at a real parts house uses 3/8" tube. ONLY use high pressure hose. SAE J1019 217 psi working. NOT fuel hose for a carb engine.