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be ordered from any Chevy dealer and carried a complete factory warranty.
In 1990, the other Corvette Supercar was released,
the ZR-1. With its awesome 32-valve, four-cam, all-aluminum engine, big brakes
and wide wheels, this factory-built Supercar soon became known as the "King
of the Hill." While it did not dethrone the Callaway Twin Turbo –
performance of the two super Corvettes is almost identical – it did make
the Callaway less viable. With the new LT-1 engine being introduced for the
‘92 model year, Callaway decided to halt Twin Turbo production at the
end of 1991. ZR-1 sales were brisk the first year, but subsequently tapered
off, and production of the "King" was halted after the 1995 model.
The first Twin Turbo Callaways were the ultimate
in "sleepers," looking almost totally stock. They soon added strong
Dymag wheels, and in 1988, the slick "Aerobody" option became available.
One advantage the Callaway had over the ZR-1 is that they were available in
both coupe and convertible versions, while the ZR-1 was relegated to coupes
only. Also, the ZR-1 came only with the ZF 6-speed transmission, while the
Callaway came standard with the Doug Nash 4+3 manual (1987 to 1989), the ZF
(1990-1991) and a modified GM Turbo-Hydramatic automatic at $4500 extra. Horsepower
for the Twin Turbo increased over the years, from 345hp in 1987 (100 more
than stock), to 385hp in 1991. The ZR-1 changed over the years, too, sharing
the same body and interior updates as the standard Corvette, and >>
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|
Engine |
||
|
Model |
1990 Callaway Twin Turbo |
1990 ZR-1 |
|
Type |
OHV V8 Cast Iron Block Aluminum Heads |
4-valve DOHC V8 Aluminum Block & Heads |
|
Bore & Stroke |
101.6mm x 88.4mm |
99.0mm x 93.0 mm |
|
Displacement |
350 cu.in. 5735 cc |
350 cu.in. 5727 cc |
|
Horsepower |
390 @ 4250rpm |
375 @ 6200rpm |
|
Torque |
562lb-ft @ 2500rpm |
370lb-ft @ 4500rpm |
|
Compression Ratio |
7.5:1 |
11.0:1 |
| Performance* 0-30mph 0-60mph 0-100mph Quarter Mile |
2.1sec. 5.1sec. 11.5sec. 13.4.1sec. @ 107.5mph |
1.9sec. 4.9sec. 11.5sec. 13.4sec. @ 108.5mph |
|
*From Road & Track Corvette Special Series 1990 |
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