pewter02z28gs

im putting irs in my 02 z28 just trying to get feed back on what problems i might run in to and if anyone else has done this

subtlez28

iTrader: (15)

It has been done, I saw a thread w pics on here. I think it was even in this section, less than a year ago. If memory serves it was on a firebird. It sat kinda high in the back, but I think they said they planned to work on that.

I think its a very cool idea. But its hard to justify the hellish fab and costs. That said, Go For it! Your car should be built to your desires, practicality b damned!

subtlez28

iTrader: (15)

Yeah, I thaught it was an LT1 bird, and C4 IRS.

Here you go...its a thing of beauty!
https://ls1tech.com/forums/showthrea...ght=f-body+IRS

pewter02z28gs

thanks for the help iv already got the irs so theres no turning back now plus why be like everyone else

SIK02SS

iTrader: (11)

have fun and please keep us updated on your progress!

RoadHazard

iTrader: (1)

What kind of IRS did you get?

Ripper415

iTrader: (6)

i read somewhere on this site (i think it was in a mod written sticky) about irs slowing down the launch. and that being why fbodys can run identical track times as vettes...because they dont have the irs to slow them down.

Ripper415

iTrader: (6)

ok after some digging i found it here
https://ls1tech.com/forums/new-ls1-owners-newbie-tech/458711-general-et-hp-database-what-s-your-1-4-mile-time.html

"The corvette differs from the F-body in a few things. It is lighter, weighing in near 3200lbs (empty) [zo6 is around 3100lbs (empty)] vs. the F-body's 3600lbs (empty). It handles better, due to less weight, lower center of gravity, and better suspension (IRS). IRS makes launching a Corvette more difficult that is why they pull similar times at the strip."

speed_demon24

iTrader: (6)

It looks like we have a real "winner" here.

SIK02SS

iTrader: (11)

IRS is used for taking corners. a live axle is (mainly) used for straight line racing. however if a poorly engineered/designed IRS is present (03-04 cobras), they gain corner speed by switching to live axle

SIK02SS

iTrader: (11)

i was trying to go easy. at least he used search!

jb442

iTrader: (4)

I worked at a performance shop in the late 80's and we put the same Corvette C4 IRS in a Buick Grand National. As far as I can remember, it wasn't too bad to get it installed because there are just two main mounting points (I think the pics of the Firebird has some good shots of these points). IIRC, we cut out part of the frame to fit the mounts higher instead of grafting the mounts underneath the existing frame. A new upper-shock mounting had to be fabricated as well. I know I have some pictures around here, but I haven't seen them in years. The car seemed to handle better, but we really didn't have a chance to dial it in.

pewter02z28gs

its an irs out of a 96 grandsport and this is a road course car im buliding just going straight was amusing when i was younger but i wanna do something different and to those will say you should got a vette it was a thought but id rather do it myself and have something different plus anyone with money can buy a vette.

subtlez28

iTrader: (15)

Preach on Brother!!

Keep us posted...lotsa pics and tech!

SIK02SS

iTrader: (11)

Amen!

ChucksZ06

iTrader: (9)

Man are you confused about the cobra...I am a chevy guy and road race a z06. I race an 03 cobra with stock irs (I am talking road courses) and it is way better than a stock mustang and also better than a 4th gen z28 which is much better than a live axle mustang...they suck going around corners no matter what you read in the magazines.

SIK02SS

iTrader: (11)

mmkay; i don't read the mustang magazines so i don't know what they say. the design of the IRS's in them aren't very good. People switch to live axles all the time b/c of it....i am not saying the live axle in the stangs is very good either..but both CAN work

if you're a member on frrax, maybe you should read this thread: http://www.frrax.com/rrforum/index.p...6&hl=cobra+irs