TQ Stall Speed
Thread Starter
Melting Slicks
Joined: Feb 1999
Posts: 2,473
Likes: 10
From: New Paltz, New York USA
TQ Stall Speed
I am putting a new 350/300HP crate motor in my 81. I want to replace my old torque converter with a new one. I have found a new Th350C, 30 spline lock up converter on ebay. My problem is I have no idea what stall speed I would need. Can anyone help. The car is just going to be used for cruising on weekends. Thanks.
Intermediate
Joined: Dec 2008
Posts: 47
Likes: 0
From: cary nc
i wouldnt know exactly what stall speed you would need, but sounds like your gonna be running a pretty much somewhat better than stock performing engine. i have a mildly modded 350 in my 79 (cam and headers dual exhaust) and im running a B+M holeshot 2000 stall converter. i wanna get to the dragstrip sometime and see if its any faster than the stock converter was. as far as driveability goes, its identical to the stock converter. im not sure how a 2400 stall converter would be, but im very happy with my 2000 stall.
Instructor
Joined: Jun 2009
Posts: 129
Likes: 2
From: Nashville, TN
totally depends on motor CID cam and final gearing.
stock 350 daily driver with long gears, you want pretty low stall... like 850-1200
if it a hopped up motor you can go bigger... it all depends on what you want to do with the car.
btw why did you get a TH350. 700R4's are cheaper, stronger and have an extra gear ...
stock 350 daily driver with long gears, you want pretty low stall... like 850-1200
if it a hopped up motor you can go bigger... it all depends on what you want to do with the car.
btw why did you get a TH350. 700R4's are cheaper, stronger and have an extra gear ...
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,116
From: Crossville TN
'Stock' stall speed would be in the area of 1500-1700 rpm, I believe. But stall speed is dependent on the engine torque that the converter will be seeing. If that converter is spec'ed with a stall speed of 1700 rpm at 300 ft-lbs of torque, for instance, and your engine generates 350 ft-lbs, that converter would probably not stall out until 1900 rpm or so. The higher the power placed on a given torque converter, the higher the point at which it will stall.
To say it another way, any converter will have different stall speeds for engines with different power levels. To properly select the converter that is best for your engine and the way you want to drive it, you need to call the tech line of a torque converter manufacturer/vendor and let them guide you. Grabbing one off of eBay is not the best way to go...unless you already know that the specs for that unit are exactly what you need.
To say it another way, any converter will have different stall speeds for engines with different power levels. To properly select the converter that is best for your engine and the way you want to drive it, you need to call the tech line of a torque converter manufacturer/vendor and let them guide you. Grabbing one off of eBay is not the best way to go...unless you already know that the specs for that unit are exactly what you need.
Racer
Joined: Nov 2006
Posts: 264
Likes: 0
From: McLouth Kansas
The shop that rebuilt my trani wanted to see my cam card,,,rear gear ratio and the height of my rear tire and guessed on my Vacuum according to what I told him about the engine.
He picked what converter I needed and his pick was right on the money.
So if you call for some tec advice,,,I suggest you have that info ready just in case.
He picked what converter I needed and his pick was right on the money.
So if you call for some tec advice,,,I suggest you have that info ready just in case.
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Heel & Toe
Joined: Jan 2001
Posts: 19
Likes: 0
From: Buda,TX
Richard,
I have a 1980 "C3" I just put a GM Crate Engine in - 350 cubic inch - 330 HP - the car was delivered with a 350/190 HP engine. I had the old trans re-built, adding a more poerful Torque Converter. The Drive Train takes the increased HP well, and the more powerful Torque Converter was the right thing to do I've been told.
The Internet has gobs of info that will address questions such as yours. I'd recommend starting with this website: http://www.aa1car.com/library/torque...rs_performance.
What follows came from the Internet I believe, but don't know the address: "Stall Speed is the RPM that a Torque Converter has to spin in order for it to overcome a given amount of load and to begin moving the wheels. Under stall conditions and increasing RPM to the converter's stall rating enables the torque converter to multiply the engine torque to its full potential, until the torque exceeds the brakes' holding power and the tires start to spin. (This doesn't read well - but it's all I've got). Good Luck!
I have a 1980 "C3" I just put a GM Crate Engine in - 350 cubic inch - 330 HP - the car was delivered with a 350/190 HP engine. I had the old trans re-built, adding a more poerful Torque Converter. The Drive Train takes the increased HP well, and the more powerful Torque Converter was the right thing to do I've been told.
The Internet has gobs of info that will address questions such as yours. I'd recommend starting with this website: http://www.aa1car.com/library/torque...rs_performance.
What follows came from the Internet I believe, but don't know the address: "Stall Speed is the RPM that a Torque Converter has to spin in order for it to overcome a given amount of load and to begin moving the wheels. Under stall conditions and increasing RPM to the converter's stall rating enables the torque converter to multiply the engine torque to its full potential, until the torque exceeds the brakes' holding power and the tires start to spin. (This doesn't read well - but it's all I've got). Good Luck!
