Originally Posted by diehrd

The stall speed of a converter is often misunderstood.

Take two table fans , point one at the other , now turn one on and the air flow will make the un-powered fan blades rotate.

Inside the t/c , the case and its fins are the powered fan (Impeller) and your Turbine is connected to the trans input shaft is the fan with no power.

As you increase rpm more fluid is directed to the turbine and that translates into rotations into the transmission.

( I AM BEING casual with terms to make it simple)

Now what is stall speed ?

The outer case of your T/C (impeller) as it throws fluid to the opposing blades (Turbine) it causes them to rotate and the car to move. The more you rotate the T/C the more fluid will push from the impeller to the turbine. No different then the two fans, as we increase fan speed the un-powered fan will also increase in RPM.

What is stall.

Simply put it is the rpm at which the impeller and the turbine rotate at a 1 to 1 ratio. ( Not 100% 1 to 1 that leads to what lock up clutches do) , BUT basically, Lock up clutches when applied lock the converter input and output rotations ensuring a 100% 1 to 1 rotation).

Stall speed is the number at which this 1 to 1 takes place . 1700 , 5500 whatever it was built to do. It does not mean you can not move until stall speed is reached all it means is that 1 to 1 ratio which allows full power to flow through you're drive line is not attained until the specified stall speed rpm.

Some guy's will tell you the car needs more RPM to move from a stop and in those cases you will see the overall diameter of that T/C is much smaller then the OEM size , this will also cause a lot more heat, Be aware Size matters, if you want a nice driver yet a high stall speed that only comes into play when you are asking for max power, Pay the money and have a 10" possible 9.5 but 10" should allow as close to oem driving because like a tire the smaller the diameter the more it needs to rotate to cover the same distance as a taller tire does.

These 9" or so converters WILL make it feel like you are slipping however what you are feeling is the effect of the smaller diameter. It takes more turns with a 9" then a 11" to cover the same distance.

Back to Stall .. lol sorry i ramble ..

So that all being said .. Stall speed like mine 3600 with a 10.5 converter with lock up , allows me to idle at a lower rpm it also allows me to come out of the hole like a mad man and because I went 10.5 my daily driving is as normal on hills and from a stop and at cruse as a lower stall would offer.

That comes at a price 750.00 , but it makes it so much more worth it words can not do it justice. ( Oem 4L80e converter is 13" and why I went 10.5)

Stall : Allows for a bigger cam because the loading of the motor at a 1 to 1 ratio is pushed up the rpm range taking the strain off the motor.

Stall: Allows the motor to REV much higher before the 1 to 1 occurs ensuring the engine power is applied at a rpm that allows the motor to pull at full power with out being dragged under its power band.

STALL: Also reduces RPM drop between shift points allowing the motor to stay in its power band through the entire pull or run at every shift point.

There is no best stall speed, It is the best for a specific Combination of parts from the motor back. Cam companies offer a suggestion and it usually is close enough but I suggest you stay closer to the top rpm suggested not the lower. Because as long as you pay attention to diameter the stall speed will only be noticed when you want it to be.

Originally Posted by Buccaneer

Go here and have a look. http://www.converter.cc/ Talk to Dave, the owner. He can explain anything you want to know about which converter you would want. I'm somewhat willing to bet that he will suggest a 9.5", 3,500 SS TC, but I could be wrong. That TC is not too big for the street and will drive like stock until you stick your foot into the loud peddle.

I run a 9.5" 3,200 behind a 383 and love it. Motor rev's fast and power turns on quick. That cam spec is very close to Comp's HR280 cam which I have and will be going into my motor soon along with a head change, I run DART Pro1s now and like them, but new heads going on should wake it up a bit more and work great with my build. Good luck with your choice.

Originally Posted by c3_dk

Reply from Dave

John I would use our SS3200 model for your setup it would be the best and it will have lockup since your transmission is a lockup. I have attached a link it to it below on my website that will fit your setup. You can place your order with it on my website.

http://www.converter.cc/Yank_SS_Seri...buick%20gn.htm

Thanks
Dave

Originally Posted by Buccaneer

Go here and have a look. http://www.converter.cc/ Talk to Dave, the owner. He can explain anything you want to know about which converter you would want. I'm somewhat willing to bet that he will suggest a 9.5", 3,500 SS TC, but I could be wrong. That TC is not too big for the street and will drive like stock until you stick your foot into the loud peddle.

I run a 9.5" 3,200 behind a 383 and love it. Motor rev's fast and power turns on quick. That cam spec is very close to Comp's HR280 cam which I have and will be going into my motor soon along with a head change, I run DART Pro1s now and like them, but new heads going on should wake it up a bit more and work great with my build. Good luck with your choice.

Originally Posted by Buccaneer

Sounds about right and I have the same in mine, but I would still call him. Nice that he replied quickly.

Originally Posted by c3_dk

What heads have you bought?



I will call him, I'm of to France for a week. But I will call him, when I get back, but I have to find out when, there is a big time difference.

Originally Posted by Buccaneer

I have these now, just not installed yet. AFR 195cc SBC Eliminator Street. Running a CFI system you can't go huge on heads, but these should work just fine with a little bit more intake valve size. at 2.05 vs. 2.02.

Originally Posted by c3_dk

Reply from Dave

John I would use our SS3200 model for your setup it would be the best and it will have lockup since your transmission is a lockup. I have attached a link it to it below on my website that will fit your setup. You can place your order with it on my website.

http://www.converter.cc/Yank_SS_Seri...buick%20gn.htm

Thanks
Dave

Originally Posted by c3_dk

Reply from Precision Industries

Our 9.5" Vigilante is custom built, so when you call to place your order we'll narrow down exactly what stall speed you need based on more info about the vehicle and what you use it for primarily. Regardless of what stall speed you need, the converter sells for $848.44 and comes with our 5 year warranty against workmanship and defects and a 1 time free stall change within the first 2 years. The build time is about 5-7 business days and we accept all major credit cards.
Precision Industries
800-649-7866


I will go for SS3200
Thx.