A little montage/compilation vid of the old #G92code Camaro... more info on the G92 optioned F-Body, below...
©️nedaCFilms / MustangTown
#nedaCFilms #V8Ponycars #3rdGen #IROC
Unlike the 1985-89 models, G92 option in 1990 was expanded and purchased as a full "performance package" rather than requiring other options and simply being a performance axle option. G92 could be ordered two ways:
with or without air conditioning. Ordering G92 `without air conditioning (C41 standard heater) added the 1LE "Road Racing Performance Package". The G92 package was only available with 5.7L 350ci B2L code or 5.0L TPI 5-speed LB9 code.
All 5.7L 350ci IROC-Z's were required to have the G92 package in 1990 and 1991-92.
G92 with air conditioning (C60):
- Optional axle ratio (5.0L 305ci w/ 5-speed = 3.42 ratio and/or 5.7L 350ci = 3.23 ratio)
- Rear disc brakes (J65)
- Performance exhaust system (N10) "dual Y-pipe w/ dual catalytic converters"
- Engine oil cooler (KC4)
- 5.0 liter TPI (LB9) with 5 speed gets revised and more aggressive cam for 230hp rating
- Weight saving spare (N64)
G92 w/o air conditioning (C41) in addition to above adds
1LE "Road Racing" performance package consisting of:
- Fog lamp delete
- Aluminum driveshaft (JG1)
- Larger (11.86 inch) front rotors and PBR Australian built HD
front dual piston aluminum calipers
- Special swinging fuel pickup in gas tank and special 18 gallon
baffled fuel tank for fuel pickup down to .5 gallon reserve to
prevent fuel starvation in hard cornering
The 1990 model year was only a half year of production. Due
to the termination of the Chevrolet IROC contract, no IROC-Z's
were produced after 12/31/1989. Instead, the 1991 Camaros were
introduced early during last half of the normal 1990 model year...
1990 IROC's are easily identifiable: 1990 was the first
year for the updated interior which included drivers side airbag,
redesigned instrument panel, yellow lettering on dash, rounded
controls, etc. So 1990 IROC's are the only IROC's with the new
interior...
In 1990, the base engine for the IROC was finally the higher
horsepower LB9 TPI 305 rather than the base lack luster economy
version TBI LO3 V-8. However, G92 had to be specified now to get
the more aggressive cam and 230hp LB9 motor in the 5 speed LB9
IROC-Z. Previously, all 5 speed LB9 IROC-Z's got the higher
output LB9. One other difference between a 1989 5.7 IROC and a
1990 5.7 IROC are the pistons.The 350 (only) received lighter
weight pistons thus a slight horsepower increase of 240 (1989) to
245 (1990). In 1990, TPI Camaros switched
from MAF air metering systems to MAP systems.
This eliminated the mass airflow (MAF) sensor...
IROC-Z convertible now came standard with 16 inch wheels and
P245/50ZR-16 tires.
G80 limited slip differential became standard equipment on IROC-Z.
The Borg-Warner HD rear end was dropped and replaced with the
old 7.625 (7 5/8) inch rear end. Because the Borg-Warner axles
were no longer being used for the G92 option, optional axle ratios
changed slightly: LB9 305 TPI 5 speed went from 3.45 (1989) to
3.42 (1990) and the B2L 350 TPI went from 3.27 (1989) to 3.23 (1990).
Many late-model enthusiasts consider the 1985-86 years being the models that ushered in the rebirth of the American Performance PonyCars, with the introduction of GM's 5.0L TPI (Tuned Port) and Ford's 5.0L EFI, the High-Output PonyCar wars were again in full force... By 1990 and with GM tired of the lighter 5.0 LX having its way with the Camaro and Firebird, the G92 option was offered as a full "Performance Package" rather than simply a performance axle option... with G92 consisting of multiple performance upgrades and weight saving options and the 5-speed cars getting more aggressive cam specs, GM and their F-body twins were finally getting the upper hand on the street again, and getting revenge for all the 5.0L F-body automatics that were getting outrun on the streets and dragstrips by the infamously quick Fox-Body platformed 5.0L Mustang. The
G92 code was GM's Ace in its sleeve. But Ford also had a secret weapon... A bare-bones, and couple hundred lbs. lighter than the LX & GT hatch models, the 5.0L Notchback Coupe (trunk models), that could run documented 14 second flat 1/4 mile times...
