Engine undertray
Rennlist Member
Joined: Oct 2006
Posts: 8,327
Likes: 1,191
From: Vista CA
Bruce Armstrong?
Definitive thread here.
https://rennlist.com/forums/993-foru...s-no-good.html
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Joined: Sep 2002
Posts: 2,876
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From: Shrewsbury MA
Umm, no one bottomed out, per se. At least not in a way that would damage anything had the engine tray been on, which is the point. With the engine tray removed, the heater boxes can droop down ever so slightly. All one needs to do is back out of a driveway and the box can catch and rip off, as that's what happened to me.
The engine tray in place would have prevented this. An advantage to having the engine tray, as it came from the factory, on.
The engine tray in place would have prevented this. An advantage to having the engine tray, as it came from the factory, on.
+1 One of members cut openings in the cover and added wire mesh to the openings.
This sounds like the best option.
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Joined: Jul 2007
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Rennlist Member
Joined: Jan 2009
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From: San Diego
Aerodynamically it won't function as desinged if you start cutting holes in it. P/a will be reduced and therefore reducing it's ability to effectively evacuate air from under the car which helps produce downforce. You are essentially changing the air pressre under the car and that has a negative aerodynamic effect at high speeds. But then if you're a parking lot warrior you probably don't care about high speed stability.
Rennlist Member
Joined: Sep 2005
Posts: 6,962
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From: Still here...
if you reach the 993's maximum speed you might see the effect of the undertray's contribution to the car's aero.
might...
an undertray thread... a certain sign winter is near (or arrived in some parts
)
might...
an undertray thread... a certain sign winter is near (or arrived in some parts
)
Instructor
Joined: Jul 2008
Posts: 147
Likes: 2
From: South of the Red River
Aerodynamically it won't function as desinged if you start cutting holes in it. P/a will be reduced and therefore reducing it's ability to effectively evacuate air from under the car which helps produce downforce. You are essentially changing the air pressre under the car and that has a negative aerodynamic effect at high speeds. But then if you're a parking lot warrior you probably don't care about high speed stability.
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Joined: Apr 2006
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From: Rainforest (Vancouver, BC)
Mine are off on both cars. I have however mounted one of the discarded engine trays on the roof, angled down at the front. Hopefully this increased downforce will cancel any lift I've created by it's removal from under the car.
Race Car
Joined: Sep 2003
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