{"id":37304,"date":"2021-08-07T06:00:40","date_gmt":"2021-08-06T21:00:40","guid":{"rendered":"https:\/\/www.panamera-life.com\/?p=37304"},"modified":"2021-08-06T20:31:14","modified_gmt":"2021-08-06T11:31:14","slug":"rear-spoiler-964-202108","status":"publish","type":"post","link":"https:\/\/www.panamera-life.com\/en\/entry\/rear-spoiler-964-202108\/","title":{"rendered":"Replacing the Rear Spoiler Wall (Bellows) on a Porsche 911 (Air-Cooled 964)"},"content":{"rendered":"

The hot days continue, but I\u2019m still frequently driving my 964. Since it has Tiptronic, it\u2019s easy to drive both around town and for commuting, making it arguably the best air-cooled Porsche for everyday use.<\/strong><\/p>\n

One day, I casually lifted the rear spoiler to take a look and found that the plastic bellows (accordion-style) part had deteriorated and developed holes.<\/strong> While it doesn\u2019t directly affect driving performance, it looks bad from behind and isn\u2019t ideal functionally, so I decided to replace it.<\/p>\n

Porsche\u2019s Rear Spoiler<\/h3>\n

Aerodynamics matter for cars that run on the Autobahn<\/h4>\n

The 911 has a rear that slopes downward, which isn\u2019t great for downforce. Its cross-section resembles an airplane wing viewed from the side, so at high speeds, it actually generates lift instead of downforce.<\/strong><\/p>\n

A similar-shaped car is the first-generation Audi TT. Initially, it also produced significant lift, leading to many rollover accidents on the Autobahn due to insufficient downforce. As a result, a small rear spoiler was added in later minor facelift models.<\/p>\n

This might not be a big issue in Japan, but in environments like the Autobahn, aerodynamics are very important.<\/p>\n

\"911\u306e\u5f53\u6642\u306e\u30ab\u30bf\u30ed\u30b0\"

Porsche 911 (964) catalog from the era<\/p><\/div>\n

The 964\u2019s Electric Rear Spoiler<\/h4>\n

From the 964 generation onward, the 911 is equipped with an electric rear spoiler that automatically raises at a certain speed (around 80 km\/h for the 964).<\/p>\n

This raised rear spoiler features a bellows-style expandable wall, so when viewed directly from behind, the lower part of the spoiler forms a black wall. This effectively channels incoming air into the engine bay to aid cooling, reportedly doubling the air intake.<\/strong><\/p>\n

However, if this wall has holes, the airflow simply escapes out the back.<\/p>\n

\"\"<\/p>\n

\"911\u306e\u30ea\u30a2\u30b9\u30dd\u30a4\u30e9\u30fc\"<\/p>\n

Before and After Replacing the Rear Spoiler Wall<\/h3>\n

I asked my usual shop, Beeforce, to handle the replacement. It\u2019s not like the driving feel changes dramatically, but having new parts just feels good.<\/p>\n

\"964\u306e\u30ea\u30a2\u30b9\u30dd\u30a4\u30e9\u30fc\u306e\u30b8\u30e3\u30d0\u30e9\"

Before replacement. The bellows were completely split open<\/p><\/div>\n

\"\u30dd\u30eb\u30b7\u30a7911\uff08964\uff09\u306e\u30ea\u30a2\u30b9\u30dd\u30a4\u30e9\u30fc\"

After replacement<\/p><\/div>\n

Since the rear spoiler is usually retracted, it\u2019s easy to overlook issues here. If you own a 964, it\u2019s a good idea to occasionally manually raise the rear spoiler and inspect it.<\/p>\n","protected":false},"excerpt":{"rendered":"The hot days continue, but I\u2019m still frequently driving my 964. Since it has Tiptronic, it\u2019s easy to drive both around town and for commuting, making it arguably the best air-cooled Porsche for everyday use. One day, I casually lifted the rear spoiler to take a look and found that the plastic bellows (accordion-style) part had deteriorated and developed holes. While it doesn\u2019t directly affect driving performance, it looks bad from behind and isn\u2019t ideal...","protected":false},"author":0,"featured_media":24819,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_locale":"en_US","_original_post":"https:\/\/www.panamera-life.com\/?p=24803"},"categories":[269,30],"tags":[183,192,222],"yoast_head":"Replacing the Rear Spoiler Wall (Bellows) on a Porsche 911 (Air-Cooled 964) - \u30dd\u30eb\u30b7\u30a7\u304c\u308f\u304c\u5bb6\u306b\u3084\u3063\u3066\u304d\u305f - \u30aa\u30fc\u30ca\u30fc\u30ba\u30d6\u30ed\u30b0<\/title>\n<meta name=\"description\" content=\"An article about the rear spoiler on the Porsche 911, focusing on replacing the bellows section of the spoiler wall and explaining the aerodynamic benefits of the 911\u2019s rear spoiler.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.panamera-life.com\/en\/entry\/rear-spoiler-964-202108\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Replacing the Rear Spoiler Wall (Bellows) on a Porsche 911 (Air-Cooled 964) - 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