1985 IROC info

[novajoe]

1985 was the first year of the IROC-Z (No convertible was available)
The 1985 IROC-Z models that had the 305 TPI engine could only get the 4 speed automatic transmission, the manual transmission could only be had with the 190 H.O. carburated engine.
To distinguish a 1985 IROC-Z on the street, they did not have a third brake light. They had the PE1 Aluminum Wheels. Also, the double stripe just above the ground effects had the black stripe on the bottom. The IROC-Z door emblems were towards the front of the door under the sideview mirror.
The 5.7 Liter 350ci engine was not available in 1985
Leather was not an available interior fabric in 1985
Top Speed = 138.7 mph (305 TPI)
0-60 time = 6.87 seconds (305 TPI)
1/4 time = 15.3 seconds @ 89.1 mph (305 TPI)

IROC!!!!!!!!

[novajoe]

Motor Trend Magazine October 1984 Article (http://www.iroc-z.com/iroc-z/articles/articlepages/1984-1motortrendarticle.htm) - Test of the 1985 IROC-Z1985 Street & Strip Magazine - Summer 1985 IROC-Z Article (http://www.iroc-z.com/iroc-z/articles/articlepages/1985-1streetstripmagarticle.htm)1985 Hot Rod Magazine Article - IROC-Z - Thunder to Go (http://www.iroc-z.com/iroc-z/articles/articlepages/1985-2HotRodMagThunderToGo.htm)1985 Car & Driver Magazine Article (http://www.iroc-z.com/iroc-z/articles/articlepages/1985-3Car&Driverarticle.htm) - IROC Camaro Z28 (A champ in its own right) General Motors 1985 IROC-Z Engine Write-Up (http://www.iroc-z.com/iroc-z/articles/articlepages/1985-4GMEngineArticle.htm)1985 Car and Driver Magazines Top 10 (http://www.iroc-z.com/iroc-z/articles/articlepages/1985-5Car&Drivertopten.htm) AutomobilesSupercars Magazine - 1985 IROC-Z and TA Test Article (http://www.iroc-z.com/iroc-z/articles/articlepages/1985-6SupercarsMagarticle.htm)1985 Motor Trend Magazine - IROC-Z vs Mustang (http://www.iroc-z.com/iroc-z/articles/articlepages/1985-7%20Motor%20Trend%20IROCZ%20v%20Mustang.htm)

[novajoe]

1985 Chevrolet Camaro History





New noses for all 1985 Camaro models and new, deeper valances and front spoiler for the 1985 Chevrolet Camaro Z28 and the newly introduced 1985 Chevy Camaro IROC-Z28. The NACA style hood ducts were replaced by simulated hood louvers on the Z28. Z28 got new 'grid' pattern taillights. The number of lower body stripes grew from 2 to 4 on Z28 with a body colored gap between the top 3 stripes. Gauges changed slightly and the double pointer speedometer was dropped and replaced with a single pointer unit. Berlinetta aluminum wheels became an extra cost option and Berlinetta now came standard with its own unique wheel covers that were styled to look like the optional aluminum wheel. The Berlinetta aluminum wheel also became an option on the Sport Coupe but with argent accenting rather than gold and a 'Camaro' center cap rather than 'Berlinetta'. Lower body pinstiping on the Berlinetta was revised by an additional stripe.
The new IROC-Z option was available on the Z28 and came with new 16x8 aluminum "IROC-Z" rims, P245/50VR-16 Z Rated Goodyear Gatorback tires, fog lights, new grill with CAMARO on front license plate panel, .5 inch lowered ride height, body colored valances, (ground effects) Delco-Bilstein rear gas shocks, special front struts, increased spring rates, special jounce bumpers, 5 degrees of caster in front wheel alignment, (up from 3.5 on Z28) 'WonderBar' front frame rail stiffener, special valving in the steering box for increased steering effort, larger rear stabilizer bar with stiffer bushings, IROC-Z exterior decals and interior "Z28 IROC-Z" dash badge, and a thinner two-color lower body stripe. 'Tuned Port Injection' (TPI) motors are introduced. The Corvette got a 350 version (L98) and the Camaro got a 305 version (LB9) available in the Z28 or IROC-Z. LB9 was available with automatic only. L69 H.O. 305 was only available in the IROC and only with 5 speed manual. L69 production was restricted half-way (April 26, 1985) through the model year.
The IROC-Z28 was capable of .92g's on the skidpad and 63.3 MPH slaloms stock.
MPFI V-6 LB8 motor introduced to replace carbureted LC1 V-6. It Had similar port injection as LB9 TPI V-8. All manual transmissions now 5 Speeds. 7.5 inch rear end dropped and replaced with a new 7.625 (7 5/8) inch rear end for all Camaros. G92 (performance axle ratio) only available on IROC-Z for 1985.




1985 Chevrolet Camaro Drivetrain List

YrModelTransEngine
code/typeCRDispl.HPTorqueInduc-
tionManual
std.Manual
opt.
(G92)Auto
std.Auto
opt.
(G92)85Sport CoupeM5,A4LQ9 L49.0:12.5 (151)88@4400132@2800TBI3.73----3.73----85Sport Coupe
BerlinettaM5,A4LB8 V68.9:12.8 (173)135@5100165@3900MFI3.42----3.42 ----85Sport CoupeA4LG4 V89.5:15.0 (305)155@4200245@20004bbl--------3.08----85BerlinettaA4LG4 V89.5:15.0 (305)155@4200245@20004bbl--------3.08----85Z28M5,A4LG4 V89.5:15.0 (305)155@4200245@20004bbl3.23----3.08----85Z28A4LB9 V89.5:15.0 (305)215@4400275@3200TPI--------3.23----85IROC-ZM5,A4LG4 V89.5:15.0 (305)155@4200245@20004bbl3.23----3.23----85IROC-ZM5L69 V89.5:15.0 (305)190@4800240@32004bbl HO3.73------------85IROC-ZA4LB9 V89.5:15.0 (305)215@4400275@3200TPI--------3.233.42
1985 Chevrolet Camaro Production Numbers

YearTotal ProductionZ28IROC-Z28BerlinettaSport Coupe1985180,01868,40321,17713,64997,966

1985 Chevrolet Camaro Camshaft Data

Lift DurationLobeRockerEngineGM P/NInt.Exh.Int.Exh.SeparationArm Ratio1985 (L69 and LB9)305 AT14088843.403.415202206114.5(115/-114)1986 (LB9)305 AT14094097.350.385178194109.0(106/-112)1987305 AT (LB910088155*.350.384179194109.0 (108/-112)305 5spd / 350 AT
(LB9/ L98)14093643*.404.415202207114.5(115/-114)305
(LM1 Police Pack.)14093640*.383.404291202112(108/-116)1988-1989305 AT10088155*.350.384179194109.0(108/-112)305 5spd / 350 AT10066049*.415.430207213117.0(116/-118)1990-1992305 5spd / 305 AT10088155*.350.384179194109.0305 G92 5spd / 350 AT10111773*.413.428202207114.5(116/-116)



1985 Chevrolet Camaro Coefficiant Drag Results

YearCamaro85IROC-Z28: .34 Cd

[JShadx]

**** 15.3 in the 1/4. I think my bicycle is that fast. Good thing the 305 is gone. We gonna have to see what it does now. Dont think gonna be that much faster for the moment.

[novajoe]

I can fix that for you!