1988 Chevy Camaro IROC Z28 project
The car after I painted it:
This is my new project. A 1988 Chevrolet Camaro IROC-Z28 with a 305 TBI
and a 700R4 automatic transmission (unfortunately)
Needs a lot of work!
5.0 Camaro IROC-Z (230hp G92 performance package)
A little montage/compilation vid of the old G92-code Camaro... more info on the G92
optioned F-Body, below...
Produced by nedaCFilms, http://www.V8ponycars.com and http://www.Mustang-Town.com
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
All 5.7L 350ci IROC-Z's were required to have the G92 package in 1990 and
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
- 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
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
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
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...
3rd Gen Camaro - Fox-Body Mustang (the good, bad and the ugly)
Most car guys don't know the difference between the 230hp G92 optioned
models, or the 5-speed and automatic models, or the 170hp lackluster TBI
versions (not to be confused with TPI versions)... Mustang guys smoke the 170hp TBI
models, as well as the "run of the mill" TPI automatic models, and believe
they can do this to any and all. Well, not all 3rd Gen F-bodies are created
equal. Optioned from the factory with the 230hp TPI (not TBI) engine,
manual 5-speed tranny and 3.42 gears, these 3rd Gen F-body sleepers gave
5.0 Mustangs absolute hell.
In 1990 the G92 option code became a full performance package rather than
simply a rear axle option as in previous model years... GM also offered an
answer to the Saleen Mustangs by way of option 1LE, which
consisted of the G92 optioned without A/C and other creature comforts, and
the addition of Corvette brakes and other road racing equipment.
About the only way an IROC-Z Camaro could take out a 5.0L Mustang from this era was with
the Tuned Port Induction and addition of these performance options: G92,
1LE, L98 or B4C.
The TBI powered Camaro
were not at all in the same league as the performance version TPI Camaro, or 5.0 Mustang, these 170hp TBI models were
GM's economy de-tuned versions and were around 50-60 less horsepower versus the
performance optioned TPI models. These non-performing models gave the 3rd
Gen F-bodies a bad rep on the street... many think that these were the
example of 3rd Gen F-bodies, when in fact, and unlike Ford, GM offered many
models, with many engines, camshafts and rear-gear ratios...
For more info on these rare optioned Camaro & Firebird, check out my
website http://www.streetshowdriftdrags.com/Camaro.html or the Mustang guys can check out
Produced by John (Trae) King @ nedaCFilms
For more details on the G92-optioned F-Bodies, check out: