By no means am I a historian. Nor am I read enough to pull statistical information by memory from the volumes of literature I've poured over since owning my 911 C4. I find paragraphs of information online or off that I find valuable and worthy of re-reading. Many other porsche fanatics have stated facts better, pull documentation cleaner, but my attempt is to compile snippets of info in one location from all over.

That being said, when I find something I like specific to the original design and production of the 1989 911 C4 I'll be sure and post it here.

Directly from the History section on Porsche.com website:

"1988 - The new generation of the 911 comes with the in-house code designation 964. Introduction of the new model starts with the 911 Carrera 4 featuring four-wheel drive. The 964 series is available first as a coupé, its six-cylinder boxer engine featuring double ignition, plus extra size and power (3600 cc, 250 bhp/ 184 kW)."

From European Car article by Dennis Adler:

"The most important part of aerodynamics is minimizing resistance to the flow of air over the body of the car. But, equally important, though seldom addressed, is the resistance to airflow from beneath. Thus, the Carrera 4 is the first road-going Porsche to offer a full-length belly pan, the underside almost totally enclosed by plastic and metal panels. The engine itself is encapsulated by a full pan, bordered on either side by molded plastic panels. Also fully enclosed is the exhaust system. Except for the wheels and outer perimeter of the suspension, every thing is concealed. While reducing exposed area, the panels also retain heat, so the functional air intakes in the front of the bumper are used to direct air through the sealed undercarriage to assist in cooling the transmission, engine and anti-lock brake system."

He continues to say:

"For the present, however, the 1500 Carrera 4s that will be for sale in this country during the first half of 1989, and priced at a hefty $70,000 apiece, will all be coupes equipped with the five-speed manual gearbox..."

Additionally:

"At the heart of the Carrera 4 is an all-wheel-drive system which, surprisingly, was not derived from the 959, but utilizes an entirely new and less costly design. It divides torque through a mechanical center differential, delivering 31 percent of the drive force to the front wheels and 69 percent to the rear, under normal driving conditions. When needed, the system automatically directs more power to the wheels offering the best traction. In practice, you can't tell when it's working, except for the indicator light on the dash..."

I really like this synopsis from The Porsche 911 Evolution:

"In 1989 Porsche once again proofed that the 911 was trully immortal by introducing the new Carrera 4. At this time business wasn't going all too well for Porsche, and this car had the important task of rescueing Porsche. Sales had collapsed because of Porsche's lack of long-term vision in the mid-eighties.

This 911 Carrera 4 was the car that had to bring Porsche back on the track. To do that Porsche did something new: the design departement was given complete freedom to design a new 911.
A 1989 911 Carrera 2 or 4

The result was a car that was 85% new compared to the Carrera 3.2. The engine's capacity was once again further increased, now to 3.6 litres. But the most important new feature was of course the four-wheel drive system. This was one of the many techniques that was copied from Porsche's exclusive supercar, the 959. Some people even said the Carrera 4 could be seen as a '959 for the people'..."

Gas Mileage of a 1989 Porsche 911 Carrera 4 from FuelEconomy.org website:

EPA Air Pollution Rating:

From Wikipedia:

"Based with many innovation technologies from the 959 model, this would be a very important car for Porsche, since the world economy was undergoing recession and the company could not rely on its image alone. It was launched as the Carrera 4, the "4" indicating four-wheel-drive, a decision that surprised many but demonstrated the company's commitment to engineering by reminding buyers that race and rally engineering (of the 959) does affect road cars. Drag coefficient was down to 0.32. A rear spoiler deployed at high speed, preserving the purity of line when the vehicle was at rest. The chassis was redesigned overall. Coil springs, ABS brakes and power steering made their debut. The engine was increased in size to 3600 cc and developed 250 PS (184 kW)."

SPECS:
SOHC flat-opposed-6, aluminum block and heads
Bore x stroke 3.94 x 3.01 in (100.0 x 76.4mm)
Displacement 220 cu in (3600cc)
Compression ratio 11.3:1
Fuel system electronic injection
Power SAE net 247 bhp @ 6100rpm
Torque SAE net 221 lb-ft () 4800 rpm
Redline 6800 rpm

DRIVETRAIN:
5-speed manual transmission
Gear ratios (I)3.50(II)2.12(III)1.44 (IV) 1.09 (V)0.87
Final-drive ratio 3.44:1

MEASUREMENTS:
Wheelbase 89.4 in
Length 167.3 in
Width 65.0 in
Height 52.0 in
Curb weight 3197 lb
Weight distribution front/rear 40/60%
Fuel capacity 20.3 gal

SUSPENSION:
Independent front, with damper struts, lower A-arms, coil springs, anti-roll bar
Independent rear, with semi-trailing arms, coil springs, anti-roll bar

STEERING:
Rack-and-pinion, power-assisted

BRAKES:
11.7-in vented discs front
11.8-in vented discs rear
Anti-lock system

WHEELS and TIRES:
16 x 6.0-in front, 16 x 8.0-in rear cast aluminum wheels
205/55ZR- 16 front, 225/50ZR- 16 rear Bridgestone RE71 tires

PERFORMANCE (manufacturer’s data):
0—60 mph in 5.7 sec
Top speed 161 mph

ORIGINAL MSRP:
$69,500