Aerodynamics that works: balance before style

A huge wing with a decorative lip at the front makes the car worse at high speed. Aero that works is balance, not style.

The classic mistake is seen at any meeting: a huge rear wing and, at the front, a purely decorative lip. At high speed this unloads the front axle and the car is worse than standard — more unstable and understeering. Aerodynamics that works isn't style; it's balance. This guide explains how to think about front and rear together.

Three forces, one to avoid

In motion, air generates three things: lift (raises the car — bad), downforce (pushes down — good) and drag (slows you — the cost). The goal is to trade the least drag for the most downforce, and — more importantly — to distribute that downforce evenly between front and rear.

Balance is everything

A powerful rear wing without matching front downforce shifts the balance rearward. The faster you go, the more the front lifts and the less it turns. The result is a car that looks fast standing still and is frightening (and slow) at the end of the straights. See the difference:

At the front: a real splitter (not a lip)

A curved lip only "dresses up" the car. A true splitter is a flat surface that extends forward under the bumper, creates a high-pressure zone above and low below, and generates real front downforce. Combined with a well-sealed front, it's what lets you balance the wing you want to run at the rear.

At the rear: a wing at the right angle

The wing gives rear downforce — but the angle matters. Too much angle is a lot of drag for little gain; too little does nothing. A well-mounted, adjustable GT-type wing is worth more than the biggest wing in the catalogue badly placed. And remember: once you've chosen the wing, you need the front to match.

Underneath: the flat floor

Often the cheapest, cleanest gain is under the car. A flat floor and the beginnings of a diffuser speed up the air under the car and create downforce with little drag — no big wings in sight. Sealing the front and smoothing the floor is almost always the right first step.

The right order

Seal the front and smooth the floor (cheap downforce, little drag).
Front splitter for front downforce.
Rear wing to taste and discipline.
Balance front and rear — the step almost everyone skips.

Example — Civic vs 944

A Civic with a giant wing and nothing at the front understeers at high speed. A 944 with a modest splitter and moderate wing, balanced, is faster and safer — even with 'less show'.

Splitters, wings and diffusers

Splitters, wings, diffusers and accessories — but above all, we help you balance front and rear so the car really improves.

See accessories

Frequently asked questions

Does a big rear wing improve the car?

Only if there's matching front downforce. On its own, it lifts the front at high speed and causes understeer — the car gets worse. Always balance the wing with a splitter or flat floor at the front.

What's the difference between a lip and a splitter?

A lip is mostly cosmetic. A splitter is a flat surface that extends forward under the bumper and generates real front downforce, letting you balance the rear wing.

Where to start with aero without spending much?

Underneath: sealing the front and smoothing the floor gives downforce with little drag and little money. Only then does it make sense to add a splitter and wing, and balance them.