TUNE Updated 2026-05-14 2 pending verification

Forza Horizon Grip Tune Basics: Road Racing Setup Guide (FH5 -> FH6)

This guide walks through grip and road-racing tune basics in the Forza Horizon series, using the same methodical loop as our drift tune basics guide. All numeric ranges below are sourced from well-documented FH5 and Forza Motorsport (2023) tuning community work. With FH6 releasing on 2026-05-19, exact FH6 values should be treated as (unconfirmed) until the community verifies them post-launch. Use this as a starting baseline, then iterate on telemetry.

Key Facts

Field	Value
Primary use case	S1/S2 road racing, A-class circuit, B-class touge runs
Warm tire pressure target	32–34 PSI warm (ForzaTune baseline)
DiamondLobby tire pressure	20–25 PSI cold for road grip (unconfirmed which FH6 will favor)
Camber front baseline	-1.5 to -1.8 deg front, slightly less rear
Toe baseline	0.1–0.2 toe out front, 0 to -0.1 toe in rear
Caster baseline	5.5 ± 0.5 deg (ForzaTune) or 6–7 deg (SimRacingSetup)
RWD diff accel	40–60% accel, 20–40% decel
Damper bump-to-rebound ratio	Bump ~60–70% of rebound
FH6 release date	2026-05-19
FH6 tuning menu carryover	(unconfirmed)

Methodology: how to approach a grip tune

A grip tune is about maximising mechanical traction and chassis balance through corners, not raw straight-line speed. The same loop that applies to a drift tune basics setup works here, adapted for grip priorities.

Build first, tune second. Lock the PI build — drivetrain swap, tire compound, aero — before touching the tuning sliders. Changing a tire compound or swapping to AWD invalidates every setting below it. This sounds obvious, but it’s the most common source of wasted tuning time.

Baseline from a known starting point. Use the ranges in this guide as anchors, not gospel. Forza’s physics model varies enough between cars that a FR chassis, a mid-engine car, and a high-CG SUV will each need different absolute values even when the methodology is identical.

Change one variable at a time. Do a 2–3 lap stint, log what changed, then move on. Changing springs and ARBs simultaneously makes it impossible to know which adjustment fixed the balance.

Tune in this order: tires → alignment → springs/ARBs → dampers → differential → aero. This mirrors the hierarchy of what each setting affects: contact patch first, then geometry, then weight transfer, then power delivery, then downforce. For FH6 specifically, the FH5 tuning menu layout is expected to carry over, but treat numeric baselines as starting points and rebaseline once community testers publish post-launch tunes.

Tire pressure for grip

Tire pressure is the highest-leverage setting on the menu. It changes the contact patch size and the rate at which the tire heats up, which in turn affects both peak grip and breakaway character.

Source	Recommendation	Notes
ForzaTune (FH5 / FM23)	32–34 PSI warm	Industry-standard target
SimRacingSetup (FH5)	30–34 PSI cold, then test	Hone on track
DiamondLobby (FH5)	20–25 PSI cold for road racing	Aggressive low-pressure approach

The community split on this is real. ForzaTune targets the warm number a real race team would use, while DiamondLobby leans on low cold pressures to bias mechanical grip. According to the Forza community forums, higher PSI feels more responsive with higher theoretical peak grip, but grip loss is sudden; lower PSI heats up quickly, loses grip more progressively, and gives more time to correct a slide. Which end of the spectrum FH6 will reward is (unconfirmed) until post-launch testing.

For a first pass, start at 30 PSI front / 30 PSI rear cold in S1/A class. Drive two laps, then adjust until the car rotates neutrally on entry without snap oversteer on exit. The Forza forums note that targeting progressive breakaway rather than peak grip makes the car faster over a full lap, not just in the fastest corner.

Alignment: camber, toe, caster

Alignment shapes how the contact patch interacts with the road during cornering. It is tuned after pressures because pressure changes affect the dynamic camber the tire actually sees through a corner.

Camber. Run negative camber to compensate for body roll loading the outside edge of the tire. SimRacingSetup recommends starting around -1.5 to -1.8 degrees front, and slightly less at the rear — for example -1.2 to -1.5 rear. Going more aggressive than this narrows the contact patch on straights and hurts braking performance. The goal is to keep the contact patch flat when the car is mid-corner and leaning, not when it is straight.

Toe. Slight toe-out at the front sharpens turn-in; slight toe-in at the rear adds stability. SimRacingSetup’s recommendation is 0.1–0.2 degrees toe-out front and 0 to -0.1 degrees toe-in rear. ForzaTune warns that toe settings produce less predictable results in FH5 specifically, so keep changes small and test one step at a time.

Caster. Higher caster increases self-centering force and adds dynamic camber at steering lock. ForzaTune targets 5.5 ± 0.5 degrees; SimRacingSetup suggests 6–7 degrees when paired with slightly reduced static camber. Either range is a safe start — the difference between 5.5 and 7 degrees is subtle and car-dependent.

Springs, ARBs and dampers

Suspension settings control weight transfer rate and body motion. For grip on tarmac you generally want stiffer than an offroad setup, but softer than dedicated circuit motorsport — Horizon roads have crests and elevation changes that punish an overly stiff car. Compare this with the dirt tune basics guide where spring compliance is prioritised over body control.

Springs. Stiffer springs give more responsive weight transfer but skip over bumps; softer springs are more compliant but can cause bottoming. DiamondLobby notes that “stiffer springs are preferred to give more stability” on road. For FWD cars, biasing slightly stiffer rear springs helps rotation. For RWD cars, slightly stiffer front springs control understeer under power. Start with a quarter of the slider range from the soft end and adjust from there.

Anti-roll bars. ARBs only act mid-corner, so changes to them will not affect entry braking or corner-exit traction. To kill understeer, stiffen the front ARB or soften the rear ARB — never both at once, or you cannot identify which change worked. SimRacingSetup’s base recommendation is to soften front ARBs to start with and stiffen rear ARBs a touch to build a neutral platform.

Dampers. Bump controls compression speed; rebound controls extension speed. The universal starting ratio is bump = ~60–70% of rebound (SimRacingSetup) or “around two-thirds” (ForzaTune). Higher rebound at the rear helps put power down on corner exit; higher rebound at the front improves turn-in bite. Tune order within the suspension group: springs → ARBs → dampers. Do not chase a balance problem with dampers when the cause is wrong spring rates.

Differential for road racing

The differential controls how power is split between the driven wheels on corner exit. For a grip tune, you want enough lock to hook up traction without unloading the inside tire into wheelspin and pushing the car wide.

RWD baseline (ForzaTune, Forza Motorsport 2023):

Acceleration: 40–60%
Deceleration: 20–40%

Lower acceleration values make the car more willing to rotate on corner entry but can spin up the inside wheel under power. Higher values hook up better on exit but push the car wide if you are too early on throttle. Start at 50% accel / 30% decel and adjust on a corner you know well, noting whether the problem is on entry (adjust decel) or exit (adjust accel). For contrast, best JDM drift cars in FH6 run near 100% locked — the difference illustrates how much the diff setting shapes car character.

FWD baseline. Community guides suggest 15–30% acceleration for FWD road tunes. Higher values cause torque steer and understeer on exit, which is counterproductive for grip.

AWD baseline. Front 10–50% accel, rear 50–90% accel, with center diff biased rearward (e.g. 65–75% rear) for grip racing. Exact FH6 AWD diff behavior is (unconfirmed) until post-launch testing confirms it.

Differential is the last setting to tune before aero. If you change it earlier, you risk masking balance problems that should have been fixed in alignment or suspension.

Grip tune vs. drift tune comparison

Setting	Grip / Road Racing	Drift
Tire pressure goal	Max contact patch, progressive breakaway (30–34 PSI warm)	Reduce rear grip, often higher rear PSI
Camber front	-1.5 to -1.8 deg	Lower negative or near 0 for steering response
Front ARB	Soften slightly for turn-in	Stiffen to keep front planted
Rear ARB	Stiffen slightly for stability	Soften to break rear loose
RWD diff accel	40–60%	Often 100% locked
Aero	Max within PI budget	Minimal rear, balance steering

Frequently Asked Questions

What tire pressure should I run for grip in Forza Horizon?

Start around 30 PSI cold and aim for 32–34 PSI warm, per ForzaTune. DiamondLobby recommends going lower (20–25 PSI cold) for max road grip. Test both and pick the one that gives progressive breakaway rather than snap oversteer.

How much negative camber should I run on a grip tune?

Around -1.5 to -1.8 degrees at the front and slightly less at the rear. Going more aggressive narrows the contact patch on straights and hurts braking.

Should I stiffen the front or rear anti-roll bar to fix understeer?

Stiffen the front ARB or soften the rear ARB — not both at once. ARBs only act mid-corner, so changes will not affect entry braking or exit traction.

What is the bump-to-rebound ratio for dampers?

Bump should be roughly 60–70% of rebound (SimRacingSetup) or around two-thirds (ForzaTune). This applies front and rear, but the absolute values differ by chassis.

What differential settings work best for RWD road racing?

Per ForzaTune’s Forza Motorsport baseline: 40–60% acceleration and 20–40% deceleration. Start at 50/30 and adjust based on corner-exit traction.

Will FH5 tunes work in Forza Horizon 6?

(unconfirmed) until launch on 2026-05-19. The tuning menu layout will almost certainly carry over, but the underlying physics model may shift. Rebaseline once community testers publish post-launch tunes.

Sources

Pending verification: key_facts.diamondlobby_psi_note, key_facts.fh6_tuning_menu_carryover