# 2TExc - 2T Exhaust Calculator — Two-Stroke Engine Tuning Tool

> Professional two-stroke engine design, analysis, and tuning toolset. (iPhone/iPad app by Christian Schubert.)

- Source: https://appshunter.io/ios/app/2texc-2t-exhaust-calculator/id6755977997 (this page in markdown: same URL + `.md`)
- Developer: [Christian Schubert](https://appshunter.io/developer/1857778512)
- Category: Utilities
- Price: $5.99 with in-app purchases (on sale, was $17.99)
- Age rating: 4+
- Requires: iOS 15.1 · 43 MB
- Languages: American English
- Released: 2025-12-09
- Data updated: 2026-09-12
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/2texc-2t-exhaust-calculator/id6755977997/reviews.md

## What is 2TExc?

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.

## Key features

- Expansion chamber design and analysis
- 1:1 scale printable PDF patterns
- Port and ignition timing calculations
- Intake resonance tuning
- Gear ratio optimization
- Offline functionality
- Project saving and sharing

## Pricing and in-app purchases

Base price: $5.99.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Print / Export Module | $2.99 | one-time |
| All-in-One Module Suite | $7.99 | one-time |
| Gearing Calculator | $1.99 | one-time |
| Intake Resonances Calculator | $2.99 | one-time |
| Port Timing Calculator | $2.99 | one-time |
| Reverse Exhaust Calculator | $2.99 | one-time |
| Ignition Timing & Exhaust Gas Waves | $0.99 | one-time |


## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/2texc-2t-exhaust-calculator/id6755977997/reviews.md

### 1/5 — Hohe Erwartungen, leider enttäuscht

*2026-08-19*

Habe die app gekauft, leider wurde ich enttäuscht. Nach dem Kauf muss man noch eine vollversion kaufen. Leider funktioniert die Konus Erstellung nicht und die App stürzt bei erstellen ab… trotz umstellen der App auf Deutsch, sind die meisten Angaben auf Englisch

## Frequently asked questions about 2TExc

### What is 2TExc?

2TExc is a comprehensive toolset for designing, analyzing, and tuning two-stroke engines. It offers precise calculations for various engine components and parameters, ensuring reproducible results for tuners and enthusiasts.

### Does 2TExc have ads?

No, 2TExc is 100% offline and does not contain any advertisements. This ensures an uninterrupted and focused user experience for engine tuning.

### What devices does 2TExc support?

2TExc is available for iPhone, iPad, and iPod touch devices. It is designed to provide powerful engine tuning capabilities on the go.

### How often is 2TExc updated?

The latest version of 2TExc is 3.0.3, last updated on September 1, 2026. Updates typically focus on formula validation, feature enhancements, and interface improvements.

### Can I print designs from 2TExc?

Yes, 2TExc allows you to generate printable 1:1 scale PDF patterns for expansion chamber components like diffusor and baffle cones. This facilitates exact sheet metal layout for custom exhaust fabrication.

### What is the price of 2TExc?

2TExc is a paid application priced at $5.99. This one-time purchase grants access to all its professional engine tuning features.

### Is 2TExc suitable for beginners?

While built for professional accuracy, 2TExc is suitable for enthusiasts and racers who want to delve into precise two-stroke engine tuning. Its clear interface and validated formulas aid in understanding and applying tuning principles.

### Can I share my engine projects with others using 2TExc?

Yes, projects created in 2TExc can be saved, opened, and shared with other users. This feature allows for collaboration and easy transfer of tuning configurations.

## Version history (last 5 releases)

### 3.0.3 — 2026-09-01

INTAKE RESONANCES:
• CRANKCASE REED: Intake Resonances can now also be calculated for Crankcase Reed systems, in addition to Port & Cylinder Reed systems

GENERAL:
• Simplified & clarified input fields and instructions
• Minor layout improvements & bug fixes

### 3.0.2 — 2026-07-21

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

### 3.0.1 — 2026-07-08

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

### 3.0.0 — 2026-07-08

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

### 2.0.7 — 2026-06-25

WHAT'S NEW:
• Fixed rare Rev-Exhaust SVG-issues that could lead to unexpected crashes.
• Improved app stability & reliability across multiple modules.
• Enhanced calculation validation and data handling.
• Bug fixes & performance improvements.

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## More apps by Christian Schubert

- [Deck Mana Calculator Commander](https://appshunter.io/ios/app/deck-mana-calculator-commander/id6758562525)

All apps by Christian Schubert: https://appshunter.io/developer/1857778512

## Related topics

[fi exhaust pro](https://appshunter.io/ios/topics/fi-exhaust-pro) · [2 stroke petrol](https://appshunter.io/ios/topics/2-stroke-petrol)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-12.*