How do you pick the right torque converter?
Good rule of thumb is the convertor should have a stall rating 200 RPM above the lower number of the operating range of the cam. In reality a 4.11 might work fine with a stock convertor with a fairly radical street cam where a 3.08 might want a 2500-2800 stall with the same cam.
How do I choose a torque converter diameter?
Larger-diameter converters are usually more efficient and deliver less slippage, while smaller-diameter converters offer more stall speed and more slippage. Vehicle weight is another major factor that should be considered when selecting a converter.
How do you calculate torque converter?
Basic Torque Calculations
= 2F x L/2 (If the force is doubled, halving the length will develop the same torque.) = F/2 x 2L (If the force is halved, doubling the length will develop the same torque.)
How do you match a stall converter to a cam?
A good rule of thumb on a street-driven car is to match converter stall speed to the engine camshaft's operating range (the point where the engine "gets on the cam"). Racers should select stall speeds close to the engine torque peak.
Is a bigger or smaller torque converter better?
Generally speaking, the larger the torque converter, the more torque (and horsepower) it absorbs. Because of this, a larger converter will usually have less stall speed than a smaller-diameter converter.
Can you use any torque converter?
Are torque converters interchangeable? Usually not. Some transmission (like GM's TH 350 and TH400) do use same torque converter but there are also transmissions that use at least two different types of converters that are not interchangeable, like TH700-R4 which has converters for 27 and 30 spline input shafts.
Does converter size matter?
“Converter size will usually determine efficiency and the amount of power it's able to hold. The larger the converter, the tighter it will typically be and the more power it can harness.”
What is the benefit of a smaller torque converter?
A smaller diameter (than stock) torque converter will require a higher rpm to get the car moving. Great for doing burn outs as it allows the engine to get into the power band before hooking up.
What does a bigger torque converter do?
What does a bigger torque converter do? Let's more engine rpm and torque be transferred to the transmission. Depends a lot as to what you are doing with the vehicle.
What is the best stall speed for torque converter?
In general, the desired stall speed should be 500-700 RPM below the engine RPM at peak torque. This ensures a margin for application for the torque converter to take off. You don't want to have to floor your gas pedal and wait a few seconds for your vehicle to move. Think of it as a balancing act.
What is torque converter ratio?
A typical torque converter will have a torque multiplication ratio in the area of 2.5:1. The main point to remember is that all properly functioning torque converters do indeed multiply torque doing initial acceleration.
What does a 3200 stall converter do?
A high stall converter allows for the engine to be revved up higher at a stop for launching at a higher rpm. This is great for drag racing, or even towing, because horsepower generally increases in an engine as rpm increases, so long as there are not significant restrictions on airflow.
How do I match my cam to my torque converter?
Again, it's always best to match the camshaft powerband with the operating range of the rest of the components in your setup. As a rule of thumb, the Summit Racing tech department begins with the starting rpm of the camshaft powerband and adds 500 rpm to create a starting point for choosing optimal stall speed.
Is a 4000 stall streetable?
With the majority of street cars that are driven daily we build have stall converters ranging from 2,400 to 3,500, with no problem being street driven. Whereas, we will sometimes use 4,000 RPM stall converters on strip / street cars.
Is a 3200 stall converter streetable?
It really depends on the manufacturer. Some converters feel looser than others. robsrt said: A good 3200 converter will have very nice street manners.
Is a 3000 stall converter Streetable?
Most of the "daily driven" street cars we build have anything from 2,400 on up to a 3,500 stall converters in them and they are very streetable with no problems. On more radical street / strip cars we'll sometimes use a 4,000 RPM stall.
What is the strongest torque converter?
The Koenigsegg Regera Has the Strongest Torque Converter Ever Made. That's what happens when you have 1475 lb-ft of torque and no transmission. Koenigsegg's Regera hypercar is special in a lot of ways. But perhaps the most interesting part of the car is the fact that it doesn't have a transmission.
What does a 3000 stall converter do?
Most performance engines don't make power until 3,000 or so RPM, hence why when you have a higher horsepower engine with a big cam, you need a higher stall speed so the engine is closer to its "power band" when taking off from the line, otherwise it will fall on its face and be a turd off the line.
Can you swap torque converters?
Yes you can however if the torque converter got chewed up inside and then it has contaminated the rest of your transmission and just changing your torque converter will not solve the other problems that will come from the contamination in the transmission fluid.
Can I use my old torque converter?
You can, but most transmission shops will recommend other components are replaced as well within the gearbox, I guess it depends on the age and wear on the transmission and why the torque converter might have failed in the first place.
What goes bad in a torque converter?
Worn-out seals causing gear slippage or overheating. Failed clutch plates cause rough acceleration or idling. Clutch solenoid failure can result in overheating, gear slippage, and rough acceleration. It is the most common part to fail in a torque converter.
Does a torque converter multiply torque?
Yes, they do multiply torque: initially. The stator is the key. Stator --- the stator can be described as the "brain" of the torque converter, although the stator is by no means the sole determiner of converter function and characteristics.
Is a torque converter a big problem?
It converts power from the engine into hydraulic pressure that ultimately controls the shifting. A failing torque converter is one of the most common transmission problems we see, and when it fails it usually leads to other internal transmission damage.
What is the difference between 300mm and 258mm torque converter?
The torque converter is a 258 mm diameter design torque converter so it is over 40 mm smaller in diameter than the production 300 mm diameter torque converter. This significant reduction in diameter provides a noticeable difference in weight and inertia, providing for faster engine acceleration and throttle response.
How big of a torque converter do I need?
The general rule is to select a converter stall speed that is 400-500 rpms above the beginning of the engine camshaft's power band. For example, if the camshaft you purchased for your engine has a power band of 2000-6000 rpms, the converter should have around 2400-2500 rpm of stall.
Do torque converters increase hp?
No, the torque converter account for horsepower loss, no increase in horsepower, but the correct torque converter will let the engine operate in a desired RPM band for desire performance.
Is A torque converter better than a CVT?
In theory, a CVT is the most fuel-efficient among the three, and in our testing, we've seen torque converters do well with fuel economy. For durability, the best transmission is the torque converter or the traditional automatic. CVTs have fewer moving parts, but the chain drive is not as durable as hard gears.
Does torque converter affect acceleration?
Internally, torque converters use a one-way clutch device to multiply engine torque at low engine RPMs. This action aids an automatic transmission vehicle's acceleration capacity.
Is a higher stall converter better?
High stall converter is good, and sometimes even mandatory when the engine has very low torque at low rpm and high idle. High stall converter allows the rpm to rise to (or close to the rpm) where the engine has it's best torque thus the car will take off and accelerate much faster.
Is a low or high stall converter better?
For many street trucks that are used for towing, daily driving, and performance, owners choose a lower-than-stock stall converter. While high-stall converters are the ticket for racing, they generate lots of heat due to high slip percentages and can create a huge rpm drop when lockup is engaged.
What is a good stall speed?
Stall speed is best checked with the vehicle in gear at a crawl before nailing the throttle. Stock torque converters generally have a stall speed around 1,800-2,000 rpm. Higher stall speeds become necessary when horsepower and torque happen at higher rpm ranges.
What rpm is a stock torque converter?
Stock converter stall is 1400-1800 rpm. A 2000 will work well with the cam you have. Engine idle should be around 750 rpm in park or neutral. I usually set mine to 800-900rpm as my carb has no choke.
Is a 2000 stall converter good?
If the output of the torque is over estimated, the converter's stall speed will be too low, which will make the car start out slow, with a slow ET. When a car's stall speed has been properly selected the car will take off much better and have a better ET.
What happens if stall converter is too low?
The DCT has two clutches. Once they are both open, the gearbox is disconnected from the engine, so the engine can't stall. Adding a torque converter would add complexity and costs. On the other hand, a torque converter would make DCT a lot better, especially in very slow speeds, (parallel parking, traffic jam etc.)
Is a torque converter better than a DCT?
A torque converter has a stall speed. Stall speed is the maximum engine rpm reached with the brakes on before the wheels start to turn. The stall speed enables the car to move from a dead stop without stalling the engine. The torque converter is to an automatic transmission what a clutch is to a standard transmission.
What is the difference between a stall converter and a torque converter?
I'm driving a 4000 stall on the street with a large cooler and it works great. I'm typically cruising at 2,700rpm on the freeway and I notice it slipping a bit more than the 3000 I used to have. Just keep an eye on the color of your fluid.
Can a 4000 stall converter be street driven?
Good rule of thumb is the convertor should have a stall rating 200 RPM above the lower number of the operating range of the cam. In reality a 4.11 might work fine with a stock convertor with a fairly radical street cam where a 3.08 might want a 2500-2800 stall with the same cam.
How do I choose a converter stall?
That's stall speed. A 2,500 stall speed doesn't mean you need to rev the motor to 2,500 rpm for the vehicle to move." What it does mean in this case is 2,500 rpm is the limit at which the converter will hold back the engine speed if transmission output is prohibited.
What is a 2500 rpm stall converter?
Larger-diameter converters are usually more efficient and deliver less slippage, while smaller-diameter converters offer more stall speed and more slippage. Vehicle weight is another major factor that should be considered when selecting a converter.
How do I choose a torque converter diameter?
The best thing to do to confirm the problem is to test the torque converter. To test the torque converter, you must step on the pedal to the floor and accelerate your engine for up to five seconds. The reading for the revolutions per minute (RPM) will max out at the stall speed.
Can you test a torque converter?
The Banks torque converter starts out by using a machined forged billet steel front housing. This billet housing provides improved support for the internal lockup clutch, allowing it to remain completely flat under all conditions, resulting in improved lockup performance and less slippage.
Why is a billet torque converter better?
A higher stall converter, lets say 2500, will slip more and allow the engine to build up to 2500 rpm. Higher stall converters because they slip so much also build up lots of heat and require aftermarket coolers to keep tranny oil temperatures down.
Can you daily drive a high stall converter?
Stalling means that whenever the car is on the start line, and the trans brake is on, and you hit full throttle, the engine will rev up to 4500 RPM with the car sitting there, so whenever you slip that finger off the trans brake, and the tranny slips out of reverse, the car will launch at 4500 RPM, and a race motor at ...
How does a 2500 stall converter work?
With a lower stall speed, less time elapses before the motion energy of the impeller is converted to motion energy to drive the turbine, so the transmission runs cooler and lives longer. What many people don't know is that the torque converter is a tunable device.
What is a 4500 stall?
Stock torque converters generally have a stall speed around 1,800-2,000 rpm. Higher stall speeds become necessary when horsepower and torque happen at higher rpm ranges.
Why use a low stall torque converter?
The key point to remember is that stall speed is dependent on engine torque and the converter blade geometry. Change the impeller, stator or internal clearance and the stall speed will change. If the engine torque changes, the stall speed will also change.
What is the stall speed of a factory torque converter?
A high stall converter allows for the engine to be revved up higher at a stop for launching at a higher rpm. This is great for drag racing, or even towing, because horsepower generally increases in an engine as rpm increases, so long as there are not significant restrictions on airflow.
How do I increase my converter stall speed?
3200 is the stall speed of the converter. Meaning at 3200 rpm and higher, the converter slip speed is nearly zero. What that means is the engine and transmission input shaft are spinning at nearly the same speed above 3200rpm.
What does a 3200 stall converter do?
Generally speaking, the larger the torque converter, the more torque (and horsepower) it absorbs. Because of this, a larger converter will usually have less stall speed than a smaller-diameter converter.
What does 3200 stall converter mean?
To summarize, clutches are best for high-speed applications, while torque converters are ideal for applications that involve heavy loads.
Is a bigger or smaller torque converter better?
With the majority of street cars that are driven daily we build have stall converters ranging from 2,400 to 3,500, with no problem being street driven. Whereas, we will sometimes use 4,000 RPM stall converters on strip / street cars.
Is a torque converter faster than a clutch?
It really depends on the manufacturer. Some converters feel looser than others. robsrt said: A good 3200 converter will have very nice street manners.
Is a 4000 stall streetable?
Parts of the clutch can also become locked or the blades of the fan may get damaged. Once the torque converter starts to break down, the entire transmission will start to overheat, which can cause further damage.
Is a 3200 stall converter streetable?
Many torque converter failures can be caused by excessive friction, which means the torque converter's needle bearings are damaged. Also, a faulty seals or faulty clutch solenoid can be to blame. A faulty seal can allow fluid to leak and become contaminated. A bad torque converter can damage a transmission.
Will a torque converter damage a transmission?
Is it OK to just replace a torque converter?
What can ruin a torque converter?
Can you use any torque converter?
How do I know what stall speed my torque converter is?
Stall speed is best checked with the vehicle in gear at a crawl before nailing the throttle. Stock torque converters generally have a stall speed around 1,800-2,000 rpm. Higher stall speeds become necessary when horsepower and torque happen at higher rpm ranges.
What is the best stall speed for torque converter?
In general, the desired stall speed should be 500-700 RPM below the engine RPM at peak torque. This ensures a margin for application for the torque converter to take off. You don't want to have to floor your gas pedal and wait a few seconds for your vehicle to move. Think of it as a balancing act.
What is the difference between a 9.5 and 10 torque converter?
The difference is the 9.5 is looser down low and tighter up top than the 10" and it's a non lock. This means better spool-up and better efficiency than the 10". If your ultimate goal is low 7's in the 1/8 you can get away with the 10". Low 7's is usually my cut-off for the 10".
What happens if you don't put a torque converter on right?
To answer the question, normally, a torque converter that is not seated correctly in the transmission will cause an oil leak. If bolted to the flywheel, it should rotate with the engine. Did you try rotating the engine clockwise by hand at the crankshaft pulley ? Then the torque convert is not the issue.