Engineered for Control  ·  Built for Performance

RACE CAR SETUP
TOOLS THAT WORK

Think Like a Race Engineer. Drive Like a Pro.

Software and resources for real-world and sim racers who want to understand setup — not just copy one. More than a decade helping drivers go faster.

See What's Coming in July Previous Apps
10,000+
Users Helped
10+
Years of Development
30+
Racing Titles Supported
Releasing July 2026

Two Big Launches This Summer

The next evolution of Monkey Face Software — a new app and the book that explains the thinking behind it all.

onRails
New App

onRails

The Race Engineer in Your Sim Cockpit

Two purpose-built tools, one app. Build a race setup from scratch with the Setup Developer, then fine-tune it lap by lap — and even mid-race — with the Setup Engineer. Runs as a transparent overlay on top of your sim. No alt-tabbing. No spreadsheets. No downloading someone else's setup and hoping for the best.

Coming July 2026 — Windows PC
Race Car Setup eBook cover
New eBook

eBook

Think Like a Race Engineer. Drive Like a Pro.

A practical system for building speed and consistency — written by Tim McArthur from decades of real-world and sim racing experience. Available as a PDF download on Itch.io and for Kindle.

Coming July 2026 — Kindle
Previous Apps

Still Available on Steam & Itch.io

The original Monkey Face apps — still available on Steam and Itch.io.

Virtual Race Car Engineer

Your on-call race engineer in software form. Walks you through setup problems symptom by symptom and recommends specific changes — explaining the why behind every suggestion so you learn as you go.

Steam Itch.io

Setup Developer Tool

Built for racers who want to take setup development into their own hands. Input your handling issues and get structured, experienced guidance on what to adjust — and in what direction — to find more speed.

Steam Itch.io
What Racers Say

Proven Results On and Off Track

"I tried three cars, in two different sims, and in all three cars I did improve my lap times... all in all, I think Setup Developer works really well."

Billy Strange Racing

"Not only are the suggestions correct, but above all, I want to point out once again, are proposed in a clear, intuitive way."

DrivingItalia

"Setups can often be a bit of a black art... the tool can help give quick feedback from a well-reasoned and experienced perspective, dialing in your setups to be more to your liking while quicker overall."

Furious Canary

"Simple UI, but nice and informative, strongly recommend this app for anyone looking to learn more information about tuning cars and getting that extra speed!"

Lord Goose

"Awesome tool for setups"

Bert Vanj

"Very helpful in sorting out the car"

Edward Crawford

"A great tool, for learning setups or making a setup better"

Jason H Seiler

"Awesome tool to learn setup a race car, virtual or real! Thumbs up!"

Ze Jesus
About the Founder

Tim McArthur

Three decades at the intersection of motorsport and software.

Tim McArthur has spent his career bridging the worlds of competitive motorsport and software engineering. His work spans more than 30 third-party applications for major auto racing titles — including NASCAR Racing 3, NASCAR Racing Legends, Grand Prix Legends, and NASCAR Racing 4 — giving him rare insight into what drivers and engineers actually need from a digital tool.

In 2005 Tim co-created Race2Play, the largest online racing organization of its time, which ran for over a decade. During that period, a partnership with the National Auto Sport Association put him on real-world tracks, working through a full racing license program behind the wheel of an actual race car.

In 2007 he operated the High Performance Driver Tutoring program, providing one-on-one coaching to new sim racers. That coaching instinct lives in every piece of software Monkey Face builds: the goal is always to develop the driver, not just hand them a number.

Monkey Face Software LLC was founded in 2018 to house and grow the Virtual Race Car Engineer and Setup Developer Tool — products that have now helped more than 10,000 drivers better understand race car setup.

Late 90s – Early 2000s
Papyrus Design Group & Racing Title Add-On Development
Designer at Papyrus on NASCAR Racing 3, NASCAR Racing Legends, and NASCAR Racing 4; also released 30+ third-party add-on apps for major racing titles
2005
Race2Play Co-Founded
Largest online racing organization of its time — ran for over 10 years
2005 – 2007
On-Track with the NASA License Program
Two years racing a real car on real tracks via National Auto Sport Association
2007
High Performance Driver Tutoring
One-on-one coaching program for online racers
2016
Setup Developer Tool — Redeveloped & Released on Steam
First-of-a-kind software coaching drivers through setup changes, rebuilt and launched on Steam
2018
Virtual Race Car Engineer — Released on Steam & Monkey Face Software LLC Founded
VRCE launched on Steam; Monkey Face Software LLC established as the dedicated home for both products
2020 – 2021
SDT & VRCE — Redeveloped and Re-Released
Both apps rebuilt from the ground up and re-released with expanded features
2026
onRails + eBook Launch
Next generation of tools — coming July 2026