Limit Pushing - 1989 Camaro IROC-Z Dyno Test

This one had some aftermarket exhaust on it.

Third Gen .org on the 1989 Camaro:

"1989 Chevrolet Camaro History


Sport Coupe dropped, replaced by returning RS model. 1989 Chevy Camaro RS now available with LO3 V-8. Headlight pockets on RS no longer painted black. '89 Camaros now came with rear shoulder belts. The Corvette PASS-KEY ignition lock system was adopted for all 1989Chevrolet Camaros.The base 15 inch IROC wheel was restyled to have the appearance of the optional 16 inch wheel. P245/50ZR-16 tires replaced the P245/50VR-16 tires on the IROC-Z when equipped with the 16 inch wheels. TPI motors got better performing `Multec' fuel injectors. The exterior of the TPI plenum changed slightly: the ridges on top of the plenum did not extend as far forward. Calibration refinements eliminated the cold start injector.Four wheel disc optioned (J65) IROC-Z's rear brakes were increased in size from 10.5 inch rotors to 11.65 inch rotors with PBR Australian built aluminum calipers and more reliable parking brake actuators. Front discs still had 10.5 inch rotors with Delco-Moraine single piston calipers.

G92 option included N10 performance exhaust system (dual catalytic converters) which increased power output by 13% on cars so equipped. For 1989, G92 also required the following options: * 5.7 TPI motor (B2L) or 5.0 TPI motor (LB9) with 5 speed (MM5) manual. 16 inch wheels (N96) P245/50ZR-16 Goodyear Gatorback tires (QLC) Limited slip differential (G80) Rear disc brakes (J65) * Engine oil cooler (KC4)

G92 and J65 (rear disc brakes) no longer available on IROC-Z convertible.G92 and J65 (rear disc brakes) no longer available on LB9 automatic IROC-Z.1LE performance package option (option level 0 IROC-Z) became more well-known.

1LE package was obtained by ordering the following: * Level 1 IROC-Z with 5.0 TPI engine with 5 speed or 5.7 TPI engine Optional axle ratio (G92) (305/3.45, 350/3.27) and its required options. * Air conditioning delete (C41) (standard heater)

Then the 1LE performance package was installed consisting of: * Fog lamp delete Aluminum driveshaft (JG1) Performance exhaust system (N10) (dual catalytic converters) Special deflected disc shocks Aluminum spare wheel with smaller spare tire (N64) Larger (11.86 inch) front rotors with Girlock or 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. * Some came with special 16x8 light alloy mesh wheels. (XWL)

111 1989 1LE IROC-Z's were produced.

A new progressive throttle linkage was added to give smoother initial acceleration. The throttle had a smaller rate of advance at beginning of travel, and a larger ratio as the throttle was depressed"

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[legindoi1]

wow my 84 z28 pushes 190 hp stock and 200 tq stock wtf is wrong with yours?

[LimitPushing]

@legindoi1 Can't answer you. It isn't mine

[Artyfil]

What kind of engine did this one have? Those numbers are telling me it might have had a 305 tuned port injection engine (the LB9)

[LimitPushing]

@Artyfil It might be the LB9 or the LO3. I'm not sure, but I definitely think it needed a tune.

[Sk8FalIen]

how much do irocs weigh

[LimitPushing]

@Sk8FalIen About 3300 pounds

[ChubbyLoveDumpster]

Maybe with tbi... They dont say an engine has more power on paper then what it really has

[camarocomputer]

@ChubbyLoveDumpster thats on paper and not at the wheels, real world stock l98 camaros are about 200 at the wheels

[quickguesswho]

I just my my 77 Chevy Nova dyno tested. 220 hp and 241 torque to the back wheels.. Which means a little bit over 300 horses at flywheel

[ChubbyLoveDumpster]

170 hp is a stock 305 tbi... An l98 stock pushes 225 hp and 330 stock the 5.7 is fuel injected

[judgegixxer]

I thought the swinging fuel pickup and oilcooler only came in the A4U (87-90)/ R7U(91-92) cars (Players Cars). There were less of these Fbodies produced. Fbodies with these codes are all 1LEs but not all 1LEs have these codes. a4u/R7u cars also had a 5th gear that was lower than a regular t5. All R7U's came with factory dynoed/sealed LB9s that were within 1%hp rating of each other. There were no automatic r7u/a4u and I didn't think any autos made it into base 1LE's either.

[2011maxma]

i have a 88 firebird 5.7 tpi cold air intake computer chip all msd ignition with bigger fuel injectors and flowmaster exaust and hooker headers and im only pushing 285hp from the motor

[sabbie7]

@legindoi1 hey dufis, it's the torque that matters with the TPI.

[nlangley08]

@z28dc89 .....its called paracitic power loss

[CoreyHM1]

Hey guys, this was my car at pro dyno some time back. It was a 89 with the L98, i believe it was running rich (bone stock, interior and exterior was restored). Ive since had a 00' mustang GT with some bolt ons and currently a 2012' 5.0 mustang.. which should be hitting pro dynos rollers this weekend