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Copyright 2008-11 All Rights Reserved StreetShowDriftdrags.com & nedaCFilms are not affiliated with GM, Chevrolet or Pontiac, website is for entertainment purposes only
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 believe that 1985-86 ushered in the rebirth of American Performance PonyCars, with the introduction of GM's 5.0L TPI (Tuned Port) and Ford's 5.0L EFI, the High-Output PonyCar War was in full force again... 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 twin PonyCars 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... The stripped down ( and couple hundred lbs. lighter & quicker than the LX & GT hatch models) 5.0L Notchback Coupe trunk edition models, that could run documented 14.1 second 1/4 mile times, and beating the 5.7 G92 optioned F-Bodies by 3/10 of a second, and the 5.0 G92 cars by 6/10... but thats another topic on another page. |
| The last and most powerful IROC-Z Camaro |
LS1 powered IROC-Z Camaro
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