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Powernation and an IROC

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Old Jul 25, 2019 | 11:52 AM
  #1  
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From: DFW
Car: 1992 Z28
Engine: 5.7 TPI
Transmission: 700R4
Axle/Gears: G80 3.23
Powernation and an IROC

FYI in case anyone is interested -
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Old Jul 25, 2019 | 04:28 PM
  #2  
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From: Hamilton Ontario Canada
Car: 1985 Camaro IROC-Z
Engine: 350
Transmission: GForce T-5
Axle/Gears: 10 bolt 3.73 posi
Re: Powernation and an IROC

Man, there is something seriously wrong with that motor.
Very poor dyno numbers.....
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Old Jul 27, 2019 | 10:08 AM
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Car: 1991 Z28 Vert
Engine: 383 single plane efi
Transmission: T-56
Axle/Gears: 8.8 with 3.73s
Re: Powernation and an IROC

Originally Posted by Manic Z
Man, there is something seriously wrong with that motor.
Very poor dyno numbers.....
Yeah, a 355 with Trick Flow Heads, a mild cam and aftermarket exhaust should be able to put down 300 hp. The numbers they produced can be made with factory heads, a mild cam and TPI. They also reverted back to a carb from fuel injection, no reason a car magazine should be doing that anymore with nearly every aftermarket EFI having their own "self-learning" feature. Judging from this site, people are buying these cars mostly to preserve or restore to stock, a smaller number seem modifying them by way of LS or aftermarket EFI options nowadays. So why would they go this route? This smells like it's going to be another low buck Thirdgen build with no vision that gets a bunch of second-hand parts thrown at it. Like when you and I have a bunch of extra parts in the garage we sell them. When car magazines have extra parts sitting around they do this "low buck build" that only hepls to revitalize the stigma of Thirdgens and them being sub-par performance cars. A much better article would be to purchase a decent condition IROC or GTA and have an initial appraisal done. Then show the best bang-for-your-buck repairs the average Joe can do to bring up the value. End the series with another appraisal that shows how much the car would be worth afterwards. Its the basic HGTV recipe that has turned them into a cash cow and revitalized the home renovation industry for the average couple. I think BadNblk did a thread where he revitalized a black IROC and made a few thousand cash.

Last edited by Tibo; Jul 27, 2019 at 10:35 AM.
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Old Jul 27, 2019 | 11:31 PM
  #4  
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From: Midwest
Car: 1989 Pontiac Firebird
Engine: 383
Transmission: WCT5
Axle/Gears: 3.23Posi
Re: Powernation and an IROC

I always keep an eye out for third gens in car shows and they are usually pretty disappointing. It's always just a few basic mods, hardly ever the things that third gens really benefit from.
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Old Jul 28, 2019 | 05:03 AM
  #5  
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From: DFW
Car: 1992 Z28
Engine: 5.7 TPI
Transmission: 700R4
Axle/Gears: G80 3.23
Re: Powernation and an IROC

Originally Posted by Firebirdwade
I always keep an eye out for third gens in car shows and they are usually pretty disappointing. It's always just a few basic mods, hardly ever the things that third gens really benefit from.
How often do you see stock ones? They seem hard to find. The only diffs in mine vs stock is I have a fan controller, which I guess can be easily unplugged... Bosch injectors, a tune to program out the EGR, 4thgen driveshaft, AIR pump delete pulley, and a CD player... waiting for the previous owner to send me the original unit. Stuff that cant be put back to stock easily.
It's why I'm having a hard time deciding whether or not to drill a fuel pump access door... because that's a permanent mod there.
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Old Jul 28, 2019 | 09:36 AM
  #6  
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From: Desert
Car: 1991 Z28 Vert
Engine: 383 single plane efi
Transmission: T-56
Axle/Gears: 8.8 with 3.73s
Re: Powernation and an IROC

Originally Posted by Pro
It's why I'm having a hard time deciding whether or not to drill a fuel pump access door... because that's a permanent mod there.
Don't do it. I did it only because I had to since the previous owner cut one. To do it correctly you will still have to drop the gas tank so that you can weld in a trim ring that the removable door can bolt to. It is super nice to know I now have access to the top of my tank in 5 mins but in reality the pumps shouldn't be going out that often to warrant it.


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Old Jul 28, 2019 | 09:01 PM
  #7  
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From: Miami Beach
Car: 1986 IROC-Z
Engine: 305 SBC, SLP Runners, Headers
Transmission: AUTO
Axle/Gears: G80
Re: Powernation and an IROC

Originally Posted by Pro
FYI in case anyone is interested - https://www.youtube.com/watch?v=SqkIBQB5Z00
Thanks for sharing. I also was surprised by the 225 hp, my 305 with stock heads, mild cam, headers, SLP runners and EGR delete makes 237 on a Mustang dyno.
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Old Jul 29, 2019 | 02:18 PM
  #8  
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From: DFW
Car: 1992 Z28
Engine: 5.7 TPI
Transmission: 700R4
Axle/Gears: G80 3.23
Re: Powernation and an IROC

Part 2 just posted


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Old Jul 29, 2019 | 02:47 PM
  #9  
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From: North East GA
Car: 1989 Firebird
Engine: 5.7 LS1
Transmission: T56
Re: Powernation and an IROC

I'm pretty sure that video is almost 10 years old, back when SPIKE was a channel. What dyno are they using as dyno numbers are not all the same depending on the equipment.
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Old Jul 29, 2019 | 02:57 PM
  #10  
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From: Raymond, Wi
Car: 87 Formula, 91 Trans Am
Engine: 355 tpi, 305tpi
Transmission: 700r4, 700r4
Re: Powernation and an IROC

Originally Posted by Aviator857
I'm pretty sure that video is almost 10 years old, back when SPIKE was a channel. What dyno are they using as dyno numbers are not all the same depending on the equipment.
They're test driving the all new 2016 Camaro in the next segment, so more like 5 years old. Still, what a waste.
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Old Jul 29, 2019 | 04:46 PM
  #11  
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From: DFW
Car: 1992 Z28
Engine: 5.7 TPI
Transmission: 700R4
Axle/Gears: G80 3.23
Re: Powernation and an IROC

Originally Posted by Tibo
Don't do it. I did it only because I had to since the previous owner cut one. To do it correctly you will still have to drop the gas tank so that you can weld in a trim ring that the removable door can bolt to. It is super nice to know I now have access to the top of my tank in 5 mins but in reality the pumps shouldn't be going out that often to warrant it.
I saw someone on youtube do it. He basically used sheet metal, a couple of hinges, and some sort of foam or rubber in order to make a seal. Like a little door. I dont see why a piece of sheet metal (possibly painted to match the body), thin rubber lining, and about 10 rivets to hold it all together. But then again that's also more like repairing a hole in the body of a car instead of an access door.
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Old Jul 29, 2019 | 05:29 PM
  #12  
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Car: '89 Firebird
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Re: Powernation and an IROC

Watch while our team of experts adds 25 Hp of muscle using a 100 Hp nitrous shot! LOL!
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