2TExc - 2T Exhaust Calculator
Two-Stroke Engine Tuning Tool
$5.99 · In‑App Purchases · Designed for iPad. Not verified for macOS.
2TExc is the complete professional toolset for designing, analyzing, and tuning 2-stroke engines. From expansion chambers, cone design & print, to diffuser and baffle cone geometry, port and ignition timing, intake resonance, gearing, and powerband – every calculation is precise, fast, and based on validated real-world formulas.
Built for tuners, mechanics, racers, and enthusiasts who demand engineering-grade accuracy. Suitable for classic engines, modern racing setups, and custom-built projects across moped, scooter, motorcycle, kart, and competition engines.
Unlike generic calculators, 2TExc covers the entire two-stroke workflow: exhaust design, reverse analysis of existing systems, intake resonance tuning, port and ignition timing evaluation, and drivetrain matching. All modules interact logically for reproducible, consistent results.
Key Features:
1. Exhaust Calculator – Full expansion-chamber geometry, tuned length, cone angles (diffuser & reflector), diameters, 1- and 3-stage layouts, stinger plus restrictor. Precisely calculate resonance behavior and wave timing.
2. Cone Design & 1:1 Print – Build diffusor & baffle cones, headers, and transitions. Convert data directly to printable 1:1 scale PDF patterns (DIN A2) for exact sheet metal layout and final exhaust components (also in CAD).
3. Cone Bend Calculator – Create curved expansion chambers and pie-cut layouts to print. Force the longitudinal welding seam safely onto the short inside radius for maximum stability.
4. Reverse Exhaust Calculator – Calculate tuned RPM, chamber volume, ratios, and angles from existing exhausts. Compare, verify, and optimize performance.
5. Ignition Timing + Gas Wave Calculator – Convert ignition timing BTDC from degrees to millimeter. And Calculate exhaust pulse velocity under variable temperatures using proven formulas.
6. Port Timing + Reverse Calculator – Analyze exhaust, transfer, boost, and intake timings for optimal RPM tuning and powerband shaping. Alternatively, enter the desired port timings to get the exact port dimensions in millimeters.
7. Intake Resonance – Align intake pulses with exhaust harmonics for improved cylinder filling and throttle response, including boost bottle volume and resonance frequency.
8. Gear Ratio Calculator – Set ideal gear ratios, RPM transitions / RPM matching, acceleration, and top speed.
Why 2TExc?
• Complete 2T workflow in one professional tool
• Based on validated formulas and real engine data
• Predictable, reproducible results
• Printable 1:1 PDF blueprints for instant sheet metal layout
• Automatic segmenting for cone bends with seam optimization
• Projects can be saved, opened and shared with users
• 100% offline, no ads
• Fast, clean interface with instant results
• Trusted by tuners, mechanics, racers, and performance enthusiasts
Download 2TExc now and tune your two stroke engine with precision, repeatability, and confidence.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
BIG UPDATE:
• CONE PRINT & EXPORT: Generate printable cone segment templates as 1:1 scale PDF blueprints (DIN A2)
• CONE BEND CALCULATOR: Design curved exhaust elements & professional radial pie-cut section layouts
• SEAM OPTIMIZATION: Longitudinal weld seam is automatically forced onto the short inside radius of the bend for optimal stability
CONE DESIGN:
• Restructured layout for a cleaner workflow
GENERAL:
• UI optimizations & minor bug fixes
The developer, Christian Schubert, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Christian Schubert
- Size
- 45.5 MB
- Category
- Utilities
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPad
Requires iPadOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- All-in-One Module Suite $7.99
- Print / Export Module $2.99
- Ignition Timing & Exhaust Gas Waves $0.99
- Reverse Exhaust Calculator $2.99
- Port Timing Calculator $2.99
- Intake Resonances Calculator $2.99
- Gearing Calculator $1.99
- Copyright
- © 2026 Creative Media Schubert / Christian Schubert