How do I set up my car in iRacing?

SimSetApp provides a complete iRacing setup guide covering tyre pressures, suspension, differential, aerodynamics and more. Use the AI Race Engineer for personalised setup advice based on your handling issues.

What is the best setup for Assetto Corsa Competizione?

SimSetApp offers detailed ACC setup guides and a community library where real drivers share their setups. Browse setups by car, track and sim, and get AI-powered advice to fix your specific handling problems.

How do I fix oversteer in sim racing?

Use SimSetApp's Problem Solver tool — describe your oversteer issue and get instant, targeted setup changes. Adjustments typically involve rear wing, rear suspension stiffness, differential power ramp and tyre pressures.

What are the correct tyre pressures for sim racing?

SimSetApp includes a Tyre Pressure Calculator that accounts for track temperature, air temperature and sim-specific hot pressure targets to give you optimal cold-start pressures for every wheel.

simsetapp | The ultimate sim racing engineer, in your pocket. Create, manage & share setups, understand every aspect of setup tuning & more.

Learning Path

Setup Learning Path

Progress from beginner to advanced — one concept at a time. Track your progress as you go.

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Beginner

• 0/3 done

Start here if you're new to sim racing setup tuning.

Understanding Tyre Pressures

5 min

The single most impactful setting. Learn why pressures matter, how heat affects them, and where to start.

Hot pressures rise 3-5 PSI from cold — always check after 3-4 laps

GT3 target: 27-29 PSI hot (ACC), 28-30 PSI (iRacing)

Too low = overheating edges, too high = slippery and nervous

Start with the default, adjust one axle at a time

Open Tyre Calculator

Brake Bias Basics

4 min

One slider that changes how your car enters every corner. Get this right first.

57-60% front is the safe GT3 starting point

Front locking → move bias rearward

Rear stepping out under braking → move bias forward

Change by 0.5-1% at a time

Read Full Guide

What is Understeer & Oversteer?

6 min

The two fundamental handling problems. Learn to identify which one you have before trying to fix it.

Understeer: car won't turn in, pushes wide

Oversteer: rear steps out, car wants to spin

Fix understeer: softer front ARB, more front downforce

Fix oversteer: softer rear ARB, more rear wing

Always fix the entry symptom first, then exit

Open Problem Solver

Intermediate

• 0/4 done

You understand the basics — now learn how the systems interact.

Anti-Roll Bars: Your Balance Tool

8 min

ARBs are the fastest way to change balance. Learn the front-to-rear ratio approach.

ARBs only work in corners — they transfer load between wheels

Stiffer front ARB → more understeer mid-corner

Softer rear ARB → more rear grip, fixes oversteer

The F/R ratio matters more than absolute values

Start with ARBs before touching springs

Read Full Guide

Differential Power & Coast

10 min

The diff controls rotation on entry and traction on exit. Understanding it unlocks cornering speed.

Power lock = traction on exit (higher = more grip, less rotation)

Coast lock = rotation on entry (lower = rotates more)

Preload = the transition zone between coast and power

60-75% power lock is typical for GT3

Trail-brakers prefer lower coast lock

Read Full Guide

Aero Balance & Ride Height

8 min

Downforce is free grip — but only if your ride height is right. Learn the rake concept.

More rear wing = more high-speed grip, less top speed

Rake (front lower than rear) improves diffuser efficiency

3-8mm rake is typical for GT3

Too low = bottoming out on bumps

Aero balance shifts with speed — test at your key corner speeds

Read Full Guide

Camber & Toe: Tyre Contact Patch

10 min

Geometry determines how much rubber is on the road in corners. Get this right and everything else gets easier.

More negative camber = more cornering grip, less braking grip

Rear camber should be 1-2° less negative than front

Slight front toe-out sharpens turn-in

Rear toe-in is essential for high-speed stability

Use tyre wear to validate camber settings

Read Full Guide

Advanced

• 0/4 done

Fine-tuning for pace, consistency, and race strategy.

Damper Tuning: Bump & Rebound

12 min

Dampers control transient behavior — how the car responds to inputs and bumps. The final 2% of pace.

Bump controls compression — softer for kerbs, stiffer for crests

Rebound controls extension — too stiff causes hydraulic jacking

Low-speed bump = body motion, high-speed bump = kerbs

Rebound:bump ratio of 1.5-2:1 is a common starting point

Dampers are the LAST thing to adjust, not the first

Read Full Guide

Spring Rates & Weight Transfer

10 min

Springs control the platform. The right spring rate keeps your aero working and your tyres loaded.

Softer = more mechanical grip, more body roll

Stiffer = faster response, less forgiving over bumps

F/R spring ratio controls pitch behavior

High-downforce cars need stiff springs to maintain ride height

Rear-engine cars (Porsche) run stiffer rear springs

Read Full Guide

Fuel Strategy & Tyre Management

10 min

Setup isn't just about pace — it's about making the tyres and fuel last the distance.

Fuel mapping can save 10-15% — enough for one fewer pit stop

Tyre compound choice depends on track temp and stint length

Monitor tyre temps through a stint — degradation is non-linear

Softer setups are often faster over a stint even if slower on one lap

Use session logs to correlate setup changes with stint performance

Open Fuel Calculator

Setup Methodology: The Process

15 min

A structured approach to building a setup from scratch. Stop guessing, start method-ing.

Step 1: Set pressures and fuel — get the baseline right

Step 2: Fix balance with ARBs — biggest impact, easiest change

Step 3: Tune aero for the track — wing levels per circuit

Step 4: Geometry for tyre wear and response

Step 5: Dampers last — the final 2%

Always change ONE thing at a time

Open Methodology