hey all,
I was wondering what the main differences were on the last 2 years. Ive owned an 83 and 86 T/A and an 89 GTA. I'm looking for an 91-2 Z28 (personally I dont care for the batman look of the pontiacs) with the 350. Is the interior much different? I think they did away with the MAF sensor, did they? Also which cars got the dual cats? Ive looked at magazines from 91-2 and they say the cars dont shake as much. Thanks, any info would be appreciated.

darren

 

The differences between 91-92 are going to be slim if even noticable. The seams are filled better in the 92's, they also seem to use more vette and LT1 parts in the TPI system as GM wasn't making any more parts for the system soon to die. The performance is goign to be identical. Also 92's got rubber snubbers betwen the hatch and the hatch frame and late 91's to 92 got a different hatch pulldown.

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Drew
The lone Thirdgenner of the Apocalypse
predatorman@hotmail.com
My Website
87 Iroc
91 Formula 14.3@98mph
91 RS Convertible
91 Firebird V6For Sale
92 S10FOR SALE!
98 Grand Am GT

 

The MAF was used 1985-1989, then was gone. Speed density was used 1990-1992. All 350 Z28's were G92 cars in 1992, but not sure about 1991. '91 was such an odd year and a long build. March 1990 to July 1991, I think.

 

All B2L(350's)and LB9 5spds came with with the GU6 enhancement group as standard in 91-92,Which was dual cats,four wheel discs,oil cooler,and 3.23 axle(B2L)or 3.42(LB9)LB9 automatics came with a single cat and 2.73's.

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1990 Trans Am GTA,Black/Black Leather,350,auto 3.23,Dual Cats,
SLP Package,SLP Torque Converter/Shift Kit,Fastchip,GSC's
G-tech 0-60 5.1 1/4mile 13.6@104
member www.transamgta.com
Previous Thirdgen
1986 Camaro IROC-Z

[This message has been edited by black5.7GTA (edited April 13, 2001).]

 

Only the 90-92 350's came standard with dual cats and 3.23 gears. The 305 5-speeds can be either single cat 3.08's or dual cat 3.42's.


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West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

Hey Drew,
what do ya mean the TPI systems were built with more vette and LT1 parts?? just curious?
GTA.....

 

The valve covers are LT1 or TBI valve covers, ie black instead of silver. The runners are rough cast instead of smooth. The throttle body plates are blank like the LT1, etc... As far as performance it doesn't make any diffrence but you can see they were using other parts to complete the cars rather than produce parts that woudln't be needed...

 

350's never came from the factory with five speeds.......

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1991 RS LO3
mods: 14" chrome air cleaner, straight-piped after cat exhaust with one chrome dual tip on the left side.
future mods: headers, removing smog equipment, and as many cheap mods as i can find
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GONE MUSTANG HUNTING.......
BACK IN 10 SECONDS

 

Drew,you are right,the information I provided was for the Firebirds,I wonder why it was different then the Camaro those years?

 

92 will have the 25th anniversary badge on the dash, and if equippd with Z03 a badge on the trunk lid (hardtop), strippes and color matched grill.
The convts get more body strengthening, different rear seat belt arrangement.
Late in the 92 production, Chevy used what they had left of the Vette TPI parts. My early production 92Z28 has smooth runners and silver valve covers. The late production 92Z28 I parted had rough cast runners and black valve covers.

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Rob P
89RSconvtZZ4TPI
Edelbrock Hi-Flow Intake
SLP Dual Cold Air Intake
1 5/8" Headers
Semi-Siamesed Runners
MSD6AL/relocated MAT/ AdjFPR/IROC frnt@rear swaybar/wonderbar/steeringbox/alum drvshaft/ Alston SFC/3:23posi disc rear/MAC LCA/H.Adams Panhard Rod/KYB struts/ shocks/
92Z28convt5spd
71Impala convt 402BB
BETTER DRIVING THRU SUPERIOR HORSEPOWER!

 

Does anyone know how many 92 Z-28 conv. were made? I think I remember seeing a number around 1400 some time ago.

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George Betzhold
92 Z-28 Convertible
93 Typhoon #2115
86 S-10 flamed w/ 95 4.3 Vortec driveline

 

92 Z conv numbers....
1254

Jeremy

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WE WILL MISS YOU #3
92 Z conv
5-spd B&M shifter
home-made ram air, air foil, headers, no cat, TB bypass, kevlar pads, slotted rotors, BMR panhard, alston SFC, 3.42's, Edelbrock STB, 350 in the works