RMK

I finally found an IROC and it's an 87 LB9 auto and looks completley stock.

How fast is it in stock form (it's pretty quick actually, I can smoke the tires upto 40 and had it upto 120mph) and what mods can I do to get more power and how much hp will they add? What about torque, how can I get more of that too and still keep the origional block?


Thanks,

RMK

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1987 IROC-Z Auto (LB9)
Black/grey with kick *** looks

Mods
None yet as I just got it Tell me what to do to it and I'll do it though.

Dan87IROC-Z

The first place to start is with a good performance tune up (Accel or MSD ingntion parts, AC/Delco Rapid Fire plugs, K&N Filters change all fluids, flush radiator, you know, the works). At the same time, do all the free mods you have tools to do. Cut out all the baffels under the air filter housing, take the screens off of your MAF sensor, port your plenum, and do a throttle body coolany by-pass. There are several articles in the tech section of this site that show you how to do all those things.
Then, the first place to start spending real amounts of money is on your exhaust. With all the more air you are getting put into you engine, you will want to free up the exhaust to take some of it out. Depending on how much money you have, get a set of headers, gut your catalytic converter and get a mandrel bent, 3" cat-back system. Most people use the Edelbrock TES Headers sold from Summit or Jegs for around $320. When you have your exhaust manifolds off, take off your cat, and gut it. Then add a good cat-back system from Hooker, Edelbrock, Flowmaster, ect. expect to spend about $300 or so there too. All of these things together, should take close to a full second off of your 1/4 mile times!

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission with 2.77:1 Rear End

Current Mods: Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip with 160* Thermostat, Accel Ignition Components, K&N Filters, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET : 14.32 @ 97.7mph
(corrected for elevation)

Soon to come: LT4 HOT Cam, Air Flow Research 190cc Heads, 2800 RPM Stall Converter and SLP 3.70 Rear End Gears.

JJ

if it smokes the tires up to 40, either get those 13" 155s off it, or if you have real tires, DONT touch anything !

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87 IROC, 350/5 speed. gmpp 350, vortec heads w/some work, XE268, 1.5rr's, 650dp, rpm intake, MSD ing., ect.
89 formula, L98.

Yarnboy

Don't remove the MAF screen! There..now you can't say I didn't warn you. Your car should run mid 15's stock if you shift the auto your self. Are you smoking the tires through 40 with the breaks on? I really really doubt they smoke if you just step on the gas..I get smoke the tires up to 60 but Im only moving about 11 MPH. Good luck with your car!

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-Red '88 IROC 5 Speed 305 TPI w/3.08
-Dual Friction Centerforce Clutch
-Accel 300+ Racing Ignition
-Accel 300+ Pro Sleeve Plug Wires
-Accel U-Groove Plugs
-Flowmaster Force II 3 Chamber Cat Back Exhaust
-Hypertech Chip
-Hypertech Airfoil
-Removed, Then Re-installed (out of fear) MAF Screens
-Gutted Air Box
-Best E/T 14.686, 60' 2.205, 1/8th mile 9.461, 1/4 MPH 93.91
-Best 60' 2.17

bleak

DON'T REMOVE THE MAF SCREEN!

A full tune up will make a major difference. That's true on almost any used car.

After that exhaust, a shift kit, and some N2O.

Mkos1980

iTrader: (8)

SO TRUE .

As with the MAF screens LEAVE THEM IN

Bort62

Mine will Spin the TIRE up to about 50 Mph actual Vehicle Speed If I start with a breakstand and am doing a right Turn



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85 Z28 - Daily Driver
60 Ranchero - Project ( Money Hole )

RMK

If I mash the gas at a stand still without my foot on the break they just smoke up then it hits 40 and gets grip then its off. It's scary. The tires are stock 245s and I think I'll try for 255 if they will fit at the back.

As for the screen I'll probably just leave them in that way theres no danger of the sensor breaking.

I'll go for the K&N filter swap and the Ram Air conversion from the tech articles. Has anyone done that yet? How easy was the Ram Air and did you put a small hole in the tube to let any water exit that may get sucked in?

I'm also looking to get the kit from GM p#8673948 that will allow me to upshift into 4th at WOT.

Thanks again

RMK

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1987 IROC-Z Auto (LB9)
Black/grey with kick *** looks

Mods
None yet as I just got it Tell me what to do to it and I'll do it though.

Bort62

If you can Just mash it from a standstill and smoke the tires that bad, thats pretty impressive


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85 Z28 - Daily Driver
60 Ranchero - Project ( Money Hole )

RMK

If I mash the gas at a stand still without my foot on the break they just smoke up then it hits 40 and gets grip then its off. It's scary. The tires are stock 245s and I think I'll try for 255 if they will fit at the back.

As for the screen I'll probably just leave them in that way theres no danger of the sensor breaking.

I'll go for the K&N filter swap and the Ram Air conversion from the tech articles. Has anyone done that yet? How easy was the Ram Air and did you put a small hole in the tube to let any water exit that may get sucked in?

I'm also looking to get the kit from GM p#8673948 that will allow me to upshift into 4th at WOT.

Thanks again

RMK

------------------
1987 IROC-Z Auto (LB9)
Black/grey with kick *** looks

Mods
None yet as I just got it Tell me what to do to it and I'll do it though.