Suspension and Chassis Questions about your suspension? Need chassis advice?

When do I need Subframes?

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Old May 18, 2004 | 01:07 PM
  #1  
northmusic's Avatar
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From: Aurora, IL
Car: 1990 Formula 350
Engine: 350 TPI
Transmission: Auto
When do I need Subframes?

Hi Everyone,

I apologize if this question has been asked before, but I'm looking for some advice....

I just purchased a 1991 Z28 with a 305 from my father. The car is in great condition, but lacks power badly. I want to keep it as original as possible, so the only upgrades I plan on doing are:

K&N Filter
Air Foil
SLP Headers
Free flowing CAT
Flowmaster exhaust
160 Thermo

I'm guessing that I'll get about 20-25 HP out of it.

On to my question:
Since I want to keep the car in mint condition, would I need subframe connectors to prevent any T-top cracks, body issues, etc?.... Or is the power still low enough to where I wouldn't have to worry about it?

Thanks for the advice!
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Old May 18, 2004 | 02:01 PM
  #2  
ebmiller88's Avatar
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From: Fort Mill, SC, USA
Car: '88 Iroc, '91 RS, and a '70 RS
Engine: 5.7 TPI; 5.0 TBI; ZZ4/T56 on the ag
Transmission: A4, A4, slated to be a T56
SFCs are the first mod you should do IMO. You will love the difference they provide. They greatly stiffen the body and will take care of a lot of the creaks and squeaks your car has, especially a T-top car.

Ed
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Old May 18, 2004 | 02:39 PM
  #3  
RB83L69's Avatar
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From: Loveland, OH, US
Car: 4
Engine: 6
Transmission: 5
When do I need Subframes?
Whenever you don't have them.

Period.

Your car needed them before it rolled onto the showroom floor.
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Old May 18, 2004 | 02:40 PM
  #4  
northmusic's Avatar
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From: Aurora, IL
Car: 1990 Formula 350
Engine: 350 TPI
Transmission: Auto
Thanks for the info.

Now that you mention it, the car does make a lot of squeaking sounds.
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Old May 18, 2004 | 06:10 PM
  #5  
Pat Hall's Avatar
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From: Roy,UT USA
Listen to these guys. It's definitely sound advice. It doesn't matter if you have a four cylinder or a V6 in there. Power output is only one of the reasons you should add subframe connectors. If you plan on keeping the car for a while and want a more pleasurable driving experience, adding connectors is well worth the effort. I've owned my car for about nine years, and I should've put them on back then! You won't regret it.
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Old May 18, 2004 | 08:14 PM
  #6  
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From: Dirty Jersey
Same as everyone else said. Do it now before you do anything else. Save your money, get them installed, and drive home in satisfaction that you listened to us. Unless your brakes don't work or something like that; might want to invest in that first.
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Old May 18, 2004 | 08:22 PM
  #7  
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They should have been installed from the factory.....

Your car will benefit from having SFC's wether you drive an V6 or have done a monster engine swap....Hands Down

A Strut Tower Brace is a nice compliment to the SFC's and will really decrease the amount of squeeks from the car.....
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Old May 18, 2004 | 08:30 PM
  #8  
omnipotentgoku's Avatar
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From: El Paso, Texas
Car: 1987 IROC Z
Engine: 350 TPI L98 block
Transmission: 700R4
When do I need Subframes?
It falls in order of things to get just after gasoline
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Old May 18, 2004 | 08:30 PM
  #9  
CaysE's Avatar
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From: Dirty Jersey
Wonderbar, too
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Old May 18, 2004 | 09:30 PM
  #10  
badapple's Avatar
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Joined: Apr 2004
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From: West Virginia
Car: 1987 GTA
Engine: 350 TPI
Transmission: 700R4
Whats the best SFCs on the market guys? And then the best for the buck?
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Old May 19, 2004 | 07:25 AM
  #11  
northmusic's Avatar
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From: Aurora, IL
Car: 1990 Formula 350
Engine: 350 TPI
Transmission: Auto
Thanks again for the advice everyone!

I'll go ahead and place the order this week then. It certainly sounds like it will benefit me in more ways than one.
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Old May 19, 2004 | 10:23 AM
  #12  
T/A_TERROR's Avatar
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From: maryland
Car: 85' T/A
Engine: sbc w/tpi
Transmission: 700R4
you don't want to be like me. I keep putting off sfc's all week and then on race day I'm like "am I pushing my stock chassis to far?". Now I feel like an idiot couse I'm running a tpi on a 400 w/3.73 on a 2.01 short time and now I cant afford sfc's cause I need to do a trans.

darn it
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Old May 19, 2004 | 11:49 AM
  #13  
Dante93GTZ's Avatar
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From: East Tennessee
Car: 1992 Z28 Heritage Edition
Engine: L98
Transmission: T56
Axle/Gears: 3.23:1
Originally posted by T/A_TERROR
you don't want to be like me. I keep putting off sfc's all week and then on race day I'm like "am I pushing my stock chassis to far?". Now I feel like an idiot couse I'm running a tpi on a 400 w/3.73 on a 2.01 short time and now I cant afford sfc's cause I need to do a trans.

darn it
I'm in the same boat. I bought my car, put leather seats in it, full exhaust and did some of the free mods.

All in all, My car rattles and squeaks SO bad now... I wish I would have done SFC's FIRST.
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Old May 19, 2004 | 12:00 PM
  #14  
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From: Chesterfield, Indiana
Car: 1991 Z28 Camaro
Engine: 5.7
Transmission: Jasper 700R4 Stage II
Axle/Gears: 3.23 For Now
I know I need a set....still trying to find a place that can weld them up....every shop around here does horrible welding...
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