ive heard 215 210 and 205 what is the hp and tq,and stock quater mile

 

205 hp @ 4400 rpm 285 LBS @ 3200 rpm-
That torque might be wrong but I'm pretty sure the rest is right.

The air cleaner set up is very restrictive, a 5.0 TPI IROC is 215 hp (5speed).

I think high 15s in the 1/4 GTAs are pretty heavy. But at least you have "the good cam"

------------------
88 TBI IROC- mods- 5500 rpm redline tach, 240 KM/H speedo,
L69 air cleaner (installed someday

 

205hp@4400rpm 270ft/lb@3200rpm.
1/4mile 15.2@91mph

BTW,you have 3.45 gears not 3.42's.

------------------
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

 

I'm not sure about the years but the post 1987-88, 305 TPI,stick cars had somewhere between 210-230HP, depending on if it was a single-cat or a dual-cat car. Add 5HP for Chevys due to a cold air set-up.

------------------

1990 Formula
Factory:TPI-305/Dual Cat(230hp),5 Speed,3.42 rear, Dealer:Aluminum Drive Shaft
Mods:SLP air foil,K&N Filter, Accel:wires,coil cap,rotor.Hypertech Thermomaster chip,Stat,Fan switch,TES headers,MSD6AL,AFPR(46), Harwood fiberglass hood,original GM "Notchback GTA" hatch.
Flowmaster 3" Cat-back exhaust,TB coolant bypass, Centerforce clutch (going).

 

btw black5.7GTA i have 3.42 not 3.45 gears ive checked.they switched to 3.45 in the later years

 

Dual cats weren't available till 89. If the car has a 9 bolt rearend it has 3:45's. 3:42 is a GM ratio.

------------------
Drew
The lone Thirdgenner of the Apocalypse
predatorman@hotmail.com
My Website
87 Iroc
91 Formula 14.3@98mph
91 RS Convertible
91 Firebird V6Sold
92 S10FOR SALE!
98 Grand Am GT

 

I have 3.42 mother ****ing gears

 

If you say you do....than you must.

 

Not too many 87 GTAs would have 3.42s... those are available in the 10-bolt. Most GTAs came with a 9-bolt, for which that ratio is unavailable. 3.45 was the equivalent one that was used. I take it your rear has been swapped at some point.

------------------
"So many Mustangs, so little time..."
ICON Motorsports

 

MY BAD 3.45 is correct i could have sworn i had 3.42.could have sworn i had gu6 in my rpos but it's gm3

 

The 5 speed was not available until '87 with TPI.
If it is an auto you have 3.42's.

 

^^^

The title of the post says 87,and auto(350 only) 87 GTA's came with 3.27's.

 

The title says 305 5spd and i have 3.45 gears.thanks for the insight black5.7GTA

 

Maybe i should read the title before i post. For some reason i thought it said '85.

I have a '87 IROC with 5 speed, 3.45 limited slip rearend. It is rated at 215 hp. The gta was rated at either 205 or 210 hp. in '87.