BustaWrench › Answers › Should I add more downforce to fix understeer in iRacing?
The short answer
No. Aero only starts doing real work above roughly 100 mph, so more wing will not fix a slow-corner push — it will just make you slower down the next straight. Downforce adds to mechanical grip, it does not replace it. Fix the balance with tyre pressure, brake bias or your own braking point first, and use aero as a fine-tune afterwards.
Downforce presses the car into the track at speed: more grip in the corners, paid for with drag, which eats your straight-line speed. Every wing, splitter and diffuser is that trade.
The bit that catches people out: aero adds to mechanical grip, it does not replace it. It only starts doing real work above roughly 100 mph. Below that it is dead weight.
If you are sliding in a slow corner, more wing does nothing useful and costs you on the next straight. Aero changes mask problems rather than curing them.
When the car understeers into a corner, the usual fix is tyre pressure, brake bias, or your braking point.
Learn the car on the default aero. When you do change something, do the front or the rear — never both — and give yourself ten clean laps before you judge it.
Aero is a scalpel, not a hammer.
Aero balance is car-specific, and on a heavy GT car one click too many is easy to make worse. Ask a coach how to read the balance before you chase lap time with it.
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