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post #1 of 3 (permalink) Old 07-19-03, 01:09 PM
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1991 ThunderbirdSC

I just bought a 1991 ThunderbirdSC and I was wanting to know if anyone knew anything about then that is special except the groundeffects and the supercharger.....what makes them so special?

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post #2 of 3 (permalink) Old 07-19-03, 07:32 PM
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Location: The Sticks of Central TX
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Re: 1991 ThunderbirdSC

Some information on the SC.

Power Plant:
The Super Coupe's come equipped with a 3.8 liter V-6 powerplant that is force-fed with an Eaton Corporation supercharger. It has an 8.2 to 1 compression ratio, combined with six computer controlled sequential fuel injectors. The supercharger provides 12 psi of boost running at a maximum 15,600 rpm's. With that it develops 210 hp @ 4000 rpm and 315lb-ft/2600 rpm of torque.

The supercharged V-6 delivers ample power without much noise. An underdrive kit and a performance chip are available to boost the horsepower rating to approximately 255hp.

91 Engine Specifications:

Type: Supercharged OHV V-6
Bore x stroke: 96.8mm x 86.0mm
Displacement: 3802cc or 232ci
Compression ratio: 8.2:1
Bhp@RPM, SAE net: 210@4000
Torque, lb-ft@RPM: 315@2600
Fuel delivery: Multi-Port Electronic fuel-injection
Fuel requirement: unleaded, 92+ octane
Exhaust-emission control equipment: 3-way catalytic converter, exhaust-gas re-circulation, air injection.


The 4-speed automatic transmission features a 0.67:1 overdrive ratio and an electromechanical lockup to eliminate torque-converter slippage.

Braking System:

The Thunderbird SC braking system features 4 wheel disc brakes with ABS. It can stop in 140 ft from 60mph and 247 ft from a speed of 80mph.

Suspension System:

Front: short and long-arm system rather than a more conventional MacPherson-strut arrangement. This system features variable-rate coil springs, a 1.2 in. diameter anti-sway bar and electronically controlled nitrogen-pressurized gas shocks.

Rear: This is even less conventional for a rear wheel drive domestic sedan. It is fully independent with a large lower H-arm on which the variable-rate coil spring rides and there is a smaller U channel upper arm. These arms are tied together by a cast aluminum knuckle. In addition, there is a 1.1 inch diameter anti-roll bar and gas-pressurized shocks with electronically controlled damping.

Wheels: P225/60R-16 Goodyear Eagle GT-II's mounted on 7 inch wide alloy wheels.

The SC is equipped with an electronic suspension control. You can switch between the soft and sport (Firm) setting. The ride control system is made by Tokico. A computer monitors vehicle speed, brake-line pressure, steering angle and engine-computer acceleration signals to determine the shock valving. There are two switch settings. These settings are: Auto and Firm. The automatic setting selects soft shock valving for a smooth, comfortable ride. When driving conditions require a firm ride, it will automatically override the soft valving. The firm position is simply an override that selects the firm setting in all driving modes.


There are two available 4speed Automatic or 5 Speed manual.

Transmission: 4-Speed Automatic Overdrive
Gear ratios:
4th (0.67) .... 2.73
3rd (1.00) .... 3.90
2nd (2.32) .... 6.33
1st (3.75) .... 10.24

Transmission: 5-Speed Manual Shift
Gear ratios:
5th (0.75)
4th (1.00)
3rd (1.43)
2nd (2.32)
1st (3.75)

0-100 ft: 3.2sec
0-500 ft: 8.6sec
0-1320 ft (1/4 mi); 15.9 @ 88.5 mph

Time to speed
0-30 mph: 2.5 sec
0-40 mph: 3.8 sec
0-50 mph: 5.5 sec
0-60 mph: 7.4 sec
0-70 mph: 10.4 sec
0-80 mph: 13.1 sec
0-90 mph: 16.4 sec
0-100 mph: 20.8 sec

That is just a little bit on the car itself. Hope that is of some help for you.
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post #3 of 3 (permalink) Old 08-12-03, 12:55 PM
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The seats are usually different. (The other Birds don't have power side bolsters, and only Birds with leather got the split-folding rear seat.)

Also, the SC came with standard (I think) variable-assist power steering, which was optional on the LX.

The 89-90 Cougar XR7 had the same options, including the SC engine. In 91, it went to the 5.0.

Visit SCCOA.com (Super Coupe Club of America) or TCCOA.com (Thunderbird and Cougar Club of America) for more info.
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