How much downforce does stock 991 spoiler produce?
Race Car
Joined: Nov 2013
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From: Austin, TX
One thing I don't think some realize is that it isn't just about the downforce, it is probably more important that it prevents lift. Without it, the lift you would get is what really messes you up. It would be interesting to know how much lift you'd get without it... even if the total downforce with it is only a few pounds.
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From: The Woodlands, TX.
One thing I don't think some realize is that it isn't just about the downforce, it is probably more important that it prevents lift. Without it, the lift you would get is what really messes you up. It would be interesting to know how much lift you'd get without it... even if the total downforce with it is only a few pounds.
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From: FL
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Joined: Feb 2017
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From: Oxford, UK
Without it, the lift you would get is what really messes you up
I remember when the Audi TT first came out there was a rash of cars losing control on the autobahns, some of them virtually getting airborne. A rear spoiler and suspension mods cured it but when you look at the original car profile, it’s not surprising as it’s very close to a high-lift wing section...
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Rocky Mountain High
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From: Kolorado
According to Porsche, the aero on the turbo produces 150 kilograms of downforce at top speed. This is about 330.6 lbs.
I haven't seen a number published for the other models.
I haven't seen a number published for the other models.
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J
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At legal-ish highway speeds, the effect of the tail on a 991 is negligible. It's sort of like PSE overrun flatulence. It's a "hey, look at me" feature.
The stat on the '73RS ducktail is that at 152 mph rear lift was 93 lb. with ducktail, 320 lb. with standard decklid. That's not bad, but if the number is similar for a 991 (which it should be) we're talking about a couple hundred pounds less lift at 150MPH on a car that weighs 3,200 pounds. In other words, under 100MPH there is no useful difference.
The stat on the '73RS ducktail is that at 152 mph rear lift was 93 lb. with ducktail, 320 lb. with standard decklid. That's not bad, but if the number is similar for a 991 (which it should be) we're talking about a couple hundred pounds less lift at 150MPH on a car that weighs 3,200 pounds. In other words, under 100MPH there is no useful difference.
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Joined: Oct 2016
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From: SF Bay Area
Be aware that there is at least one country (where your car actually comes from) where max speed of even a Turbo S is perfectly legal on some public roads. Discounting them as as show off is kind of ignorant.