Undertray and spoiler

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a_romeo_75491

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Posts:30
Joined:Sat Mar 13, 2021 5:05 pm
Undertray and spoiler

Postby a_romeo_75491 » Fri Jul 25, 2025 11:46 am

Hello all,

I was in France last weekend and on Friday night got caught in a thunderstorm. So heavy was the rain that the engine almost cut out and I lost the under tray and most of the plastic fittings that attach to the n/s wheel liner.
The spoiler itself suffered considerable damage to the underside.
Simply Performance can supply a new under tray but I will also need a new lower spoiler and attached plastic casing.

My question is, do I need the tray? Research suggests its function is mostly aerodynamic.Does anyone run without one?

Regards

David

greeban

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Posts:252
Joined:Sat Jan 16, 2010 11:05 am

Re: Undertray and spoiler

Postby greeban » Sat Jul 26, 2025 7:52 am

I cannot see which model you have - mine is a 95 facelift and I lost my under tray on A11. I made up a replacement out of aluminium - in my case it looks to add considerable strength to the spoiler/bumper. Without it, the large plastic bumper ia flimsy and I suspect would be easily damaged if you hit a high curb without the under tray to provide additional rigidity.

PaulGover

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Posts:824
Joined:Mon Jul 19, 2010 8:06 pm
Location:Near Banbury, England

Re: Undertray and spoiler

Postby PaulGover » Sat Jul 26, 2025 11:01 am

The front aerodynamics stuff was to prevent lifting at speed. Possibly only extreme speed - after all, a old V12 can do over 140 mph if you have the nerve (see a certain Top Gear episode) - but possibly dangerously light steering at 70 or so.
1986 XJ6 Sovereign Series III
1991 XJS V12 "facelift"
2021 I-Pace SE


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