DavidCook

This car I have already has the Tuned Port Induction. It is stock with dummy duals and 171 Horses. I know true duals would help. I already know that a Supercharger would help and little stuff that costs little. I am looking for expensive stuff as well as little stuff. Any reply would be nice. Thnx alot.

smokin87iroc

headers, headers, headers. that was the best money i have spent so far on my car
Andrew

------------------
Andrew Peery
1987 IROC, 305 TPI, T5
Hooker Competition Ceramic Coated Headers, Flowmaster, Ported Plenum
All smog equipment gone and no cat
before headers
192hp and 265tq
15.20 @ 92.5 mph 2.4 60ft
After Headers
14.480 @ 95.01mph 2.194 60ft

SCFORMULA1

gears, intake, headers, chip, high, flow cat, cat back system, heads, cam, and a good tune up

89 formula 305TPI
ASCD Ram-Air Hood, Neon light in Scoops of hood. custom carbon fiber Ram-Air Box, K&N Air Filter,manley street flow valves, port and polish heads, LT4 hot cam, crane chromemoly push rods, crane hydraulic roller lifters, 1.6 roller rockers, comp cams timing chain, edelbrock water pump, SLP intake - ported and polished, Adjustable fuel regulator, Power Pulleys, custom burn chip, Edelbrock Headers, Hi-Flow Cat, Flowmaster, Accell Supercoil, Taylor Wires , B&M Shift kit w/ Corvette Servo, exhaust dump, Auburn Pro-Series Posi-Trac rear end with 3.73 gears, Kenwood 6-disc Changer, 2 600-watt Kenwood 12" subwoofers , 600 watt Kenwood Amp, Racing Stripes, Blackouts, Alarm System, Chrome GM 5-star wheels off of 98' Formula with custom carbon fiber WS6 center caps.

Christos

Wow! thoes headers really made a huge diffrence for you!

How easy were they to install? Did they fit into place with no problems?



------------------
1986 IROC Camaro
305 TPI "LB9"
3.23 gears
Doesn't know enough about cars.
AIM: jesusathome

86Z28TPI

Headers are the best way to go. Also free up the intake by moding the airbox and use K&N filters. Then of course you need a real cat back system. DON'T go to true dual, that messes with TPI big time. Read the articles here about suggested TPI mods. Good Luck!

IROCZTWENTYGR8

iTrader: (1)

Who said dual isn't good with TPI??


------------------
89 RS

Looking For:
87 IROC-Z28 350 TPI

IROC-Z_85

My car has had true dual with H-pipe from the day I got it. Doesn't mess anything up! In fact i'd probably attribute it to a good portion of my cars power. But time for headers, 87iroc where/how did you get your hookers ceramic coated?

------------------
-------------------
1985 IROC-Z, nuff said :P

Dan87IROC-Z

Take a look through Summit Racing and Jegs magazines, they sell so many things in there that can help out our cars majorily. I would always start with a good tune up. After that, and doing your free mods, I would start with exhaust. Get a high flow cat-back system from Hooker, Edelbrock or Flowmaster, all are under $300, feature 3" mandrel bent piping, high flow muffler and tips. A high flow catalytic converter, or if you don't have to worry about emissions, have a 3" pipe welded into place where the cat used to be. If you do go with an aftermarket one, the Catco one from Summit is about $100 and is a good improvent. Headers are the LAST thing you want to do to your exhaust. If you have the money, SLPs are the way to go, but if not, the Edelbrock TES headers offer GREAT bang for the buck. Gears are a good improvement next. If you have an automatic, go with a set of 3.42s, if you have a 5 speed, the 3.73s are the way to go.

------------------
1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End with 2.77:1 Gears.

Current Mods: LT4 HOT Cam, Comp Cams 1.52:1 Roller Rocker Arms, Edelbrock TES 1 5/8" Headers, Catco 3" High-Flow Catalytic Converter, Hooker 3" Aerochamber Cat-Back System, Transgo Shift Kit, Performance Resource Chip, Accel Ignition, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

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

86Z28TPI

I read in either CHP or Super Chevy that true dual on a 3rd gen makes the back pressure too low causeing a reduction in low end tourque, which didn't make any sense to me; But I'm no expert. I have to take their word for it. I'll look for the article and post it if I can find it. It was within the past year and those are the only car mags I read so I know its in there somewhere.

------------------
'86 IROC Z28 TPI 305. Modified air box and MAF, K&N filters, Air Foil, SLP headers and exhaust, Comp Cams 1.52 Magnum roller tip rockers and springs, lightweight valves, Accel Super Coil, cap, and wires. Adjustable FPR with rail pressure guage, and tons of elbow grease!

Z's r Best

My 86 IROC has no mufflers on it (just a straight large diameter pipe from the cat. back to where it splits and exits the rear of the car). The back pressure is so low that anytime I spend more than a few minutes (only takes about 3 to 4 miles) at a steady throttle position the SES light comes on to tell me the EGR valve isn't working correctly. With the 700R4 and 3.42 pos rear end it will turn over those 295-50X16 BFGs fast enough to make the car go sideways. I figure it takes a fair amount of torque to spin those big tires.

------------------
Z's r Best

86Z28TPI

Very true. I am still trying to find that article. Maybe i am crazy!?!?!?!

RARE-ROC-Z

is that why that light came on. Zrsbest. i was wondering, it came on twice for me. and it hasnt come on ever again. i have borla and just a gasket where the flow restrictor is so there is no backpressure. its soo loud!

and if you get the chance , PORT THE UPPER END. as much as you can it will give you serious SOTP power, i felt it alot when i ported everything. well maybe i also put on pulleys and stuff..

------------------
Jarrad
1990 IROC-Z L98 350 TPI
TH-700R4
G92- 9 Bolt Borg-Warner 3.27gears
Bright Red Hardtop/ Grey Interior


DAILY DRIVER: 1991 GREY S10 2.5L/5SPD -FOR SALE.

86Z28TPI

Well guys, I hate to admit it but I can't find that article. Maybe it was just a dream. Sorry. If I do find it I'll post it somewhere.

------------------
'86 IROC Z28 TPI 305. Modified air box and MAF, K&N filters, Air Foil, SLP headers and exhaust, Comp Cams 1.52 Magnum roller tip rockers and springs, lightweight valves, Accel Super Coil, cap, and wires. Adjustable FPR with rail pressure guage, and tons of elbow grease!

smokin87iroc

sorry i haven't posted earlier.
i got the headers from a buddy in my car club.
they were fairly easy to put on. i don't have the serpentine belt and so i only had to worry about connedting the air conditioner bracket to a header bolt. took a little finageling but was not hard. probably 10hrs of work. the hardest part was getting the stock y-pipe to fit with some welding. the y-pipe sits a little lower but no problems so far.
Andrew