History of the 1989 Iroc ZThe 1989 model year signified the return
of the RS designation (last used in 1987 on a limited edition
California only model). The Rally Sport was now the base model
featuring body ground effects mimicking the IROC and the previous
Z28 but with the 2.8 V6 fuel-injected motor as standard with the
305 as an option. The raised rear spoiler that became available in
1988 on the base coupes was short-lived and done away with for this
year. The engine ratings carried over from '88 with the addition of
IROC-Z Coupes had a new dual catalytic converter exhaust option N10
that was standard with the G92 option only available on the 305 TPI
motor with a manual transmission and the 350 TPI only available
with the TH700-R4 automatic. 1989 was also the last year any
third-gen with the B2L RPO 350 TPI L98 engine could be ordered in
combination with the CC1 RPO removable T-Top roof panels.Power
ratings also varied in the 305 from 170 hp (standard RPO L03) to
230 hp (RPO LB9 with manual transmission and RPO N10 dual catalytic
converter exhaust) and a boost to 240 hp for the 350 with RPO N10
respectively.IROC-Zs with the TPI 350 had the 2.77 rear axle ratio
as in the previous year, but the optional RPO G92 Performance Axle
package modified the ratio to 3.27 for the TPI 350, and 3.45 for
the TPI 305 with manual transmission. RPO G92 also included the
aforementioned dual-converter exhaust; 4-wheel disc brakes (RPO
J65); engine oil cooler; P245/50ZR16 Goodyear Eagle unidirectional
tires; a 145 mph (233 km/h) speedometer; and a tachometer with a
5,500 rpm redline. A total of 1,426 IROC-Z coupes were equipped
with the Performance Axle package in 1989.To take an IROC-Z coupe
to the maximum performance extreme in 1989, when G92 Performance
Axle was ordered with no air conditioning (C41), RPO code 1LE was
automatically triggered. This included extra equipment intended to
make the IROC-Z more competitive in SCCA Showroom Stock road racing
events: larger 11.65-inch (296 mm) rotors with 2-piston aluminium
calipers from PBR; an aluminum driveshaft; a special baffled fuel
tank; specific shock absorbers; and stiffer suspension bushings.
The fog lamps were also deleted. The 1LE was simply an option
combination, not a separate package or model that dealers were
aware of the existence of, resulting in 111 cars built with 1LE
equipment in 1989.[13] Please visit our website to view a full HD
photoset of this vehiclewww.classicsbeyond.com Want to stop by and
see it for yourself? Visit Classics & Beyond Auto Gallery's indoor
museum any weekday from 10am to 6pm and Saturdays by appointment
only 35815 Clinton St.Wayne Michigan,
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