What Is a PTC Torque Converter?
PTC Torque Converters (Performance Torque Converters) are world-renowned high-performance torque converters manufactured in Muscle Shoals, Alabama since 1995. Specializing in custom-built units for drag racing, circle track, no-prep, and street/strip applications, PTC converters are trusted by racers for their durability, precise stall characteristics, and race-proven performance.
Whether you’re building a turbocharged big-block, nitrous small-block, or supercharged street machine, choosing the right PTC torque converter stall speed is critical for maximum launch efficiency, power transfer, and ETs.
How to Choose the Right PTC Torque Converter Stall Speed
Stall speed is the RPM at which your engine can rev before the vehicle moves — the point where the torque converter fully transfers power. The correct stall keeps your engine in its peak torque range for the best acceleration.
- Street/Mild Builds → 2200–3200 RPM (smooth driving, good low-end)
- Street/Strip → 3200–4200 RPM (aggressive launches without daily-drive issues)
- Bracket/Drag Racing → 4200–5200 RPM (optimized for consistent 60-foot times)
- High-Stall Race/No-Prep → 5200+ RPM (extreme power, big tires, deep gears)
Factors that influence your ideal PTC torque converter stall include engine torque curve, vehicle weight, rear gear ratio, tire diameter, transmission first gear, altitude, and converter slippage percentage. Use our advanced calculator below to get a precise estimate tailored to your combo.
Why Choose PTC Torque Converters?
PTC stands out in the drag racing world for hand-built quality, custom stator designs, and proven results on the track. Racers choose PTC for:
- Multiple diameter options (8″, 9″, 10″, 11″)
- Hybrid, lock-up, and non-lock-up designs
- Excellent customer service & quick turnaround on custom specs
- Consistent performance in high-horsepower and forced-induction applications
Many top drag racers and no-prep competitors rely on PTC converters for their reliability under extreme conditions. Whether you’re chasing records or just want a bulletproof street/strip setup, PTC delivers race-winning performance.
PTC Torque Converter Stall Speed Calculator (Advanced 2025)
Input your specs below for an accurate effective stall speed estimate. Results factor in altitude derate, aspiration type, slippage, gearing, tire size and more.
Your Estimated Effective Stall Speed
Estimate only — actual stall depends on exact combo. For your custom PTC torque converter, submit specs at toolforever.com
Final Tips for Buying Your PTC Torque Converter
Always submit your full specs to PTC for a custom build — they use real-world racing experience to create converters that win. Consider your power level, intended use, and drivetrain before deciding on stall speed. The right PTC torque converter can transform your launch, improve 60-foot times, and help you reach your performance goals.
Ready to dominate the track? Use our calculator, then contact Toolforever today!