Launch promo: ~20% off, no subscription—don’t miss it.
#1 in Japan’s Paid Apps overall (Dec 14–15).
The definitive successor to the original Trans4motor is finally here — a new installment that lets you freely explore and animate four-stroke engines on your iPad or iPhone.
Created for those who love internal-combustion engines and never tire of their rhythm, mechanics, and beauty.
【Seamless Engine Morphing】
Switch from inline to V configurations, alter bank angles, change cylinder counts, and adjust firing intervals.
Every change transforms the engine while it continues running.
Camshafts split and merge, crank phasing shifts, valve angles move dynamically — a completely new way to experience engines.
【All-New Transmission Simulation】
For the first time in the series, the gearbox itself is fully visualized.
・3-shaft synchromesh transmission
・2-shaft synchromesh transmission
・Dog gearbox (motorcycle-style)
Enter tooth counts manually, or let the app generate realistic gear meshes from gear ratios.
Follow shift forks, constant-mesh gears, clutch engagement, and truly see how power flows.
【Deep Engine Specification Editing】
Greatly expanded from the original, allowing a far richer expression of each engine’s character.
・Cylinder count, bore, stroke
・Bank angle, mounting angle
・Firing order, firing interval
・Cam drive (belt / chain / gear)
・Valve train (SOHC / DOHC / OHV / VTEC / Desmodromic)
・Valve diameter and included angle (reflected in the CG model)
・Tire width, aspect ratio, wheel diameter (outer diameter calculated automatically)
Recreate everything from spirited singles to distinctive 5-cylinder pulses, modern V4 superbikes, and the bold heartbeat of American V8s.
【Realistic Vehicle Physics】
Not just an animation.
Torque curves, vehicle mass, gear ratios, and tire diameter are calculated frame by frame to determine vehicle speed.
Shift through the gears and feel how the engine and drivetrain connect as acceleration builds.
【Connect with the “Engines” Sharing Platform】
Share your creations with the world.
・Upload / download
・Share to X (formerly Twitter)
・Community “likes” and voting
・Planned competitions
Build a community-driven engine library with fellow enthusiasts.
【GearVision Mode】
Gears, shift forks, clutches — see exactly which components are transmitting power at any moment.
A visualized power-flow mode revealing the inner workings of each shift.
【TechTour】
A hands-on learning mode evolved from the series’ interactive tutorials.
・Four-stroke fundamentals
・Firing order
・Synchromesh mechanisms
Engines become even more fascinating when you understand how they work.
【Enhanced Engine Sound】
With support from Sound Design Lab LLC, this latest audio method combines single-shot, harmonic, and random-noise components to create a natural and realistic engine presence.
Differences in cylinder count and firing intervals come through with greater character and detail.
Engine sound is included as a standard feature, not an in-app purchase.
【Preset Engines】
Trans4motor R includes 12 preset engines ranging from classic icons to modern super-sport engines and powerful V8s.
※ For learning and presentation purposes, the engine CG animations run at one-tenth of real-world rotational speed.
※ This app reproduces engines based on publicly available specifications for educational use and is not intended to be an exact replica of actual machinery, dimensions, or designs.
※ Company names and product names mentioned in this app are trademarks or registered trademarks of their respective owners.
I absolutely love this game and its improvements from the original game. In the original, all of the engine sounded like vacuum cleaners lol. But now, changing engine dynamics actually change the way engines sound! Thank you guys.Hello, this is an edit from the original review, and all I ask is one more feature. It’s more of an aesthetically active feature rather than an actual performance fix, but I wish the ability to change the intake and exhaust orientation on syncromesh mounted engines. The option still exists on the screen, but does not affect anything when toggled. Another note, I WOULD ADORE if you guys added diesel engines (at least for I3, I4, I6, and V8). And 2 strokes up to 4 cylinders. That aside, I see myself buying more games from you guys in the future with production quality of this manner.
Developer Response
Thank you so much for supporting Trans4motor since the original version—and for leaving the first review in the US for Trans4motor R!We laughed at the “vacuum cleaner” comment—we know exactly what you mean. In Trans4motor R, we rebuilt the sound so it reacts to engine settings and dynamics, and we’re truly happy you can hear the difference.Thanks again, and we’ll keep improving the app with future updates!
Love the app, one visualization problem
njae86
Any inline setup with OHV valvetrain puts the camshaft going through the cylinders and leaves the push rods in what looks like a V formation, that would be a great improvement to fix, looks like it was left half finished, also flathead valve in block would be nice to help visualize older flathead engines like the ford flathead 8
Yahhhhh
Shuddered fr gg
This game is so much better than the first one I played it for hours without getting bored you guys are amazing developers, but I asked one thing make me able to like add turbos and superchargers to my engines that would make it top-tier
Amazing
AAAHHHH!!!:0
This simulator is so amazing it has some learning aspects too. super cool to see how this works. one thing can you please add a wankel rotary engine and forced air induction systems like a turbo and a supercharger. otherwise perfect
Introducing the new “MotionStep” feature, plus a new “VTEC” chapter in TechTour.
We’ve also redesigned the “Engines” sharing site and refined many details throughout Trans4motor R.
■ MotionStep
Tap at any moment to freeze the engine, then step the crank angle forward or backward to take a closer look at the internal mechanics.
While paused, you can still rotate, pan, and zoom the view freely.
■ TechTour
A new “VTEC” chapter has been added, showing how the VTEC mechanism works.
■ Engines
The “Engines” sharing site has been redesigned.
Official engines and user-created engines are now clearly distinguished, and it’s easier to discover official and newly uploaded engines.
New upload rules also let you share more of your engine creations.
■ Editing
Slider controls in the engine editor have been further improved.
While dragging on the slider, values now snap to larger grid increments for quick, coarse adjustment.
Move your finger up or down away from the slider to switch to progressively finer grid increments, making it easy to fine-tune the value you want.
■ Graphs
A crank-angle indicator has been added to the ignition timing and piston position graph, making it easier to follow how they relate to the current crank angle.
■ Other Improvements
• Refined the motion of internal components such as cams and rocker arms
• Improved automatic clutch engagement when launching from a standstill
• Added selectable Normal/Reverse crank rotation for motorcycle engines
• Made the valve angle adjustable across all engine configurations
Version 1.1.0
The developer, Kitt Peak, Inc., 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 Linked to You
The following data may be collected but it is not linked to your identity:
Contact Info
User Content
Identifiers
Usage Data
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
