jam bo
Go on then, enlighten us.
Right, here goes:
1) drag reduction. Smooths underfloor airflow, means your car gets good economy at high speed
2) Lift reduction: Keeps air from building up under front of car and hence reduces front end lift, especially at high speed
3) Optimum cooling performance: Modern cars are powerful and need a lot of cooling. All the cooling systems, be that engine water, engine oil, aircon, intercooler/LTR, transmissions and even power steering all have airflow that is precisely managed on it’s passage through the front of your car. The undertray plays a critical part in this, allowing the hot air ejected from the engine bay to be channeled away correctly as designed
4) Protection. You might not think that thin plastic tray is doing a lot, but it is. Keeping water splash and even stray gravel out of your FEAD and the vast number of electrical and electromechanical components under the bonnet. You might think spending £200 on a bit of plastic is expensive, but if you kill the AC pump clutch due to water ingress of FOD then suddenly you’ll wish you spend that money!
5) Noise reduction. A modern car needs it’s undertray to pass the legal noise limit tests. You might like how your car sounds, but your neighbours probably don’t want to hear you rattle off to work in your diesel at 5 in the morning everyday 😉
6) Exhaust emissions and exhaust line component heat management. The way your catalyst or DPF heats up is highly dependent on the air flow around it. Don’t come running to me complaing your DPF has sooted up when you’ve been driving with the undertray missing. Likewise, if you car sets fire to the dry grass field you just parked in because your hot catalyst could touch the dry grass, i don’t want to know
But other than that, what have the Romans engine undertrays ever done for us?? 😆