Apone

I am more of a Firebird person, so I really am ignorant when it comes to the Camaro models. Basically, I was wondering what the difference was between the IROC and the Z28 during the later third gen years (87-92).
Any information on avalable engines would be helpful too. Thanks!

Drew

iTrader: (58)

Well from 85-87 the IROCZ added monochrome paint (ie GFX same color as body), 16x8 aluminum wheels, matching V rated Goodyear Gatorbacks, the Wonderbar, IROCZ badging and striping, foglights, and delco bilstein shocks. From 85-87 you could get everything from an LG4 up to the LB9. In 87 the L98 became available. Of course from 88-90 there were no Z28's without the IROC. The only real changes were the wheels, location of badging, and instead of carbed engines it was all TPI or the LO3.

prepz28

from 85-87 the IROC-Z was an option package for the z-28. than the IROC became its own model afterwards, 88-90. BTW

Intense92

The stickers!!!

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92 Camaro RS 5.0 5-Speed
L98 Alu. Heads
SLP coated headers
Dynomax cat-back
14" open air cleaner

Camaro_hunter_d

well I would have to say that the only differance is the year of production, other wise they were one and the same. In some years chevy called them Irocs and others Z/28. After a customer poll they decided that the Z/28 will stay as the performance name because of "netalgic rememberance" reasons going back to the 60's-70's name for the performance package of the camaro.

Willie

iTrader: (1)

Then how do you account for the years (1985 thru 1987) when BOTH were available?

For these years, the IROC-Z was a graphic and suspension option on the Z28. That's why the 1985 thru 1987 IROC-Z's retained the exterior "Z28" emblems.



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Willie

Supercharged 1987 305 IROC-Z, Daily-Driver, Emissions-Legal.
Former Paxton (6-psig): 12.57 @ 111 mph.
Former Paxton (6-psig) & former 50-hp nitrous: 12.04 @ 114 mph.
ATI D1SC (5-psig):
12.26 @ 113.55 mph
ATI D1SC (10-psig): Projecting high 11's.
Future ATI D1SC (15-psig): Gotta catch them pesky 26-psig boosted TTA's!!

http://willie.camaro-firebird.org/

1987 "20th Anniversary Commemorative Edition" Z28 Convertible -- Super Chevy Show Class Winner, 1998.

Camaro_hunter_d

wellI think thats when they were doing their "survey" and I was pretty sure the only real differance was the decals...Did not know the suspension was different...

Willie

iTrader: (1)

Sorry for coming on a little strong on my last post. It didn't seem that way when I typed it..

The suspension differences for an IROC-Z include:

A slightly lower ride height, about 15mm,

Specially valved struts,

Delco Bilstein shocks,

"Wonderbar",

and of course the 50 series tires, which the IROC-Z was built around.

Also, the steering box has limited stops to prevent the larger front tires from scraping against the inner fenders.


Similar to the Z28 and IROC-Z are:

Springs

Sway bars

Steering gear ratio

[This message has been edited by Willie (edited June 17, 2001).]

demonspeed

Survey? They stopped production due to losing the IROC contract to the Daytona, but maybe it was due to a survey they lost it, but more than likely it doesn't make sense.

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-Steve
89 IROC 5.7
FOR SALE
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Accel ignition, K&N, Edelbrock TES headers/y-pipe, Flowmaster American Thunder exhaust, gutted cat, 91/92 Wheels