To answer your question a 2500 stall will be no problem on the street. You will get slightly worse gas mileage.
Stall speed os the max slippage speed the torque converter will allow, ie. break torqueing your car will hold the rpm at 3200 where your cam makes its max power. The idea is that to make the best launch from a standing start, you need enough rpms to spin the wheels and not let the engine bog down.
For mild performance cars with something like a 350 HP engine, a 2,200 - 2,400 stall is about right. The basic rule of thumb is; if your engine "comes alive" at say, 3,500 RPM, then you want a stall converter with about 3,500 of stall to it.
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.
When choosing the stall speed that is right for your application, a rule of thumb is that the advertised stall speed will need to be at least 500 rpm higher than the beginning of the camshaft's powerband. All aftermarket camshafts are delivered with a recommended RPM operating range.
The idle circuit in an automatic vehicle controls the air that is circulated when the car idles. If this circuit malfunctions, then the vehicle may not have the right ratio of oxygen to operate. It will stall because the ratio is not optimal for the combustion of the fuel.
6 Signs of a Failing Torque Converter
- Loss of Acceleration.
- Slipping Between Gears.
- Vehicle Won't Shift at All.
- Transmission is Overheating.
- Transmission Fluid Leak.
- Bad Transmission Fluid.
Stall speed is the minimum speed at which an airplane must fly to produce lift. If an airplane's speed drops below its stall speed, it won't produce lift.
Flash stall is the amount of engine RPM (or flash) that is observed upon initial acceleration under load. Flash stall speed is one of the most useful ways to truly gauge the stall speed characteristics of a torque converter and how those characteristics will influence the acceleration potential of a vehicle.
An automatic transmission in general has a way of soaking up horsepower, but the torque converter can take a potent combination and turn it into a pig when the rubber meets the road. And while stall speed is important for a good launch, it's also a place for horsepower to swirl down the drain.
The main differences between centrifugal clutches and torque converters are: Centrifugal clutches connect the engine to the transmission, while torque converters allow the engine and transmission to run independently from one another.
Converter stall speed must be high enough to put the engine into the torque range where it can most efficiently launch the car. If converter stall speed is too low, the car will be lazy leaving the line; if too high, there'll be excessive high-gear slippage—either case adds time to your e.t.
Your vehicle's torque converter is the same as the clutch of a vehicle with a manual transmission. However, unlike a manual transmission vehicle, it uses fluid to transmit power to the transmission preventing your engine from stalling and allowing the transmission to change.
If the stall speed rpm is still high, then the forward clutch is defective. The test can also be made with the selector lever in R. If the stall speed is too high, it indicates slippage in either the direct/reverse clutch or in the 1st/reverse clutch.
