Torque converter

[2 Fast 4 U]

I have 3 torque converters in my garage two with a spot of green paint and one with a spot of yellow paint, does this have any meaning??

[RallyBob]

I have 3 torque converters in my garage two with a spot of green paint and one with a spot of yellow paint, does this have any meaning??

I seem to recall that the green paint was more common...used in Manta/Ascona.

I *think* the yellow was used in the GT (and possibly others), because it has a slightly higher stall speed (about 200 rpm higher), for more 'sporty' driving.

Just going off 20+ year old memory though!

[2 Fast 4 U]

Thanks Bob, can I use the yellow one in the Ascona??

[RallyBob]

Sure, no problem!

[2 Fast 4 U]

Thank you!!

[2 Fast 4 U]

.......because it has a slightly higher stall speed (about 200 rpm higher), for more 'sporty' driving......

Bob what do you mean with the "higher stall speed"

[BQS4]

Bob what do you mean with the "higher stall speed"

It means the shift points are raised, or rather it shifts at a higher speed for better accelleration. Kinda like having a free "shift kit", or did ya'll have them over there?

[2 Fast 4 U]

It means the shift points are raised, or rather it shifts at a higher speed for better accelleration. Kinda like having a free "shift kit", or did ya'll have them over there?

stupid me but what is a "shift kit"

[BQS4]

stupid me but what is a "shift kit"

A company, here in the US, called B&M makes them for most of the older vacuum shifted trans. to raise the shift points, being able to hold a gear longer for higher revs, but, this takes it's toll on a trans over time.
Welcome to B&M Racing & Performance Products!

[2 Fast 4 U]

I found this at TRANSMISSION EXCHANGE CO

Torque Converter Stall Speed

To test the stall on your current torque converter: With the engine running and the brake pedal held firmly with your left foot put the selector in drive and depress the accelerator fully to the floor with your right foot for two to three seconds. Your stall speed will be the maximum RPM shown on the tach.

so if I understand correctly the stall speed is actualy the maximum RPM the torque converter can make/let thru

[BQS4]

yes, the higher an auto trans goes through the rpm before it shifts to the next higher gear means you accellerate faster, like holding a manual trans in gear till the rpms tell you you're not getting any more power out of that gear, then you upshift.

[wrench459]

A higher stall convertor will allow the engine to rev into a higher spot(before locking) of the power curve. If you look at the difference in the two attachments you'll see want I mean.Attachment 21953Attachment 21954
The first marker is the power at 2000 rpms(26.60). The second marker is at 2500 rpms(33.68).
Now if you want to get crazy let's put a 4000 rpm stall into the old girl!

[2 Fast 4 U]

.......Now if you want to get crazy let's put a 4000 rpm stall into the old girl!....

I'll think I'll pas on that one

[2 Fast 4 U]

How can I clean/flush the torque converter on the inside?? I want to do this before I put it in the car

[guyopel]

Most Trans. shops have a Machine to clean the converters and then cut them apart to rebuild them.
There is not much you can do at home because any cleaner you try to use it would be hard to get it all flushed out ( Trash you broke loose would still be in the converter ).
If you are not sure about your converter I would have a Trans. Shop rebuild the converter ( This would get unit cleaned and balanced and new thrust washers and sprag clutch inspected ) HTH

[2 Fast 4 U]

Thank you guyopel

[2 Fast 4 U]

I'm still puzzeled about the stall speed, I tried it out today, left foot on the brake, shift into "D" and put the accelerator to the floor, result almost 2000 RPM.
When I'm pulling up with the accelerator to the floor [just before the kick-down point] the trans shifts at ± 4000-4500 RPM, from 1-2 and 2-D, and in the kick-down point, the trans shifts at ± 5000-5500 RPM, from 1-2 and from 2-D it doesn't reach the shifting point so I let the accelerator come up a little so it can shift
So what's with the 2000 RPM, and the 4000-5500 RPM shifting points??

[kwilford]

Bob what do you mean with the "higher stall speed"

yes, the higher an auto trans goes through the rpm before it shifts to the next higher gear means you accelerate faster, like holding a manual trans in gear till the rpms tell you you're not getting any more power out of that gear, then you upshift.

Not AFAIK, Gene. As described below, the "stall" speed of a torque converter is the rpm below which the converter will allow slip (i.e. the engine will rev to that rpm BEFORE power is transmitted to the transmission), above which the converter "grabs" (transmits power). The "shift points", while related to torque converter stall, are inherently not, in that internal transmission valving determines at what rpm/load the transmission shifts (either up or down), not specific torque converter stall speed.
A higher "stall" converter allows the engine to rev to a higher rpm before transmitting that power, which is desirable for drag racing or engine applications where the engine develops little power at lower rpm (eg a cam design that provides higher high-rpm power but poor low end power)

A higher stall converter will allow the engine to rev into a higher spot(before locking) of the power curve. If you look at the difference in the two attachments you'll see want I mean.Attachment 21953Attachment 21954
The first marker is the power at 2000 rpms(26.60). The second marker is at 2500 rpms(33.68).
Now if you want to get crazy let's put a 4000 rpm stall into the old girl!

I'm still puzzled about the stall speed, I tried it out today, left foot on the brake, shift into "D" and put the accelerator to the floor, result almost 2000 RPM.
When I'm pulling up with the accelerator to the floor [just before the kick-down point] the trans shifts at ± 4000-4500 RPM, from 1-2 and 2-D, and in the kick-down point, the trans shifts at ± 5000-5500 RPM, from 1-2 and from 2-D it doesn't reach the shifting point so I let the accelerator come up a little so it can shift
So what's with the 2000 RPM, and the 4000-5500 RPM shifting points??

Converter stall is as I described above, which would indicate that your's has a 2000 rpm stall. Shift points are determined by transmission valving, and vary according to load, rpm and throttle position (ie, the "kick down cable"). If your transmission won't upshift from 2nd to 3rd gear at full throttle, then the kick down needs to re adjusted or your transmission has a valving problem.

HTH

[Aardvaark]

When I switched to 205-60/13 tires from 175-80/13 tires I guess
my Manta's effective stall speed got raised. It sure feels peppier.

[wrench459]

When I switched to 205-60/13 tires from 175-80/13 tires I guess
my Manta's effective stall speed got raised. It sure feels peppier.

Now thats funny.. It's not like you changed the overall gear ratio.

In order to get a good reading of the TQ stall speed.
Flash the fluid coupler..dont power brake it.
That is with the trans in drive and at idle speed nail the throttle..when the car starts to move thats the true stall speed of the convertor. Next problem is the stock tack is way off so you really cant use that info . You'll need a better input.
Ok now let's blow some minds.
You can take the same convertor from a low torque engine an install it into a higher torque engine and the stall speed will change!