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cutting pro kit springs

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Old Jun 24, 2012 | 08:18 PM
  #1  
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Car: 1988 Flame Red Trans am GTA
Engine: Forged 355 4 Bolt, FIRST TPI
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Axle/Gears: ls1 torsen 3.42 gear
cutting pro kit springs

hey guys i was wondering would i do more harm than good if i cut maybe a half a coil off my pro kit springs..... i want the car to sit a tad lower....
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Old Jun 24, 2012 | 08:39 PM
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Car: 1982 Z28 & 1967 RS & 2002 Z28
Engine: 388 ci SB / 454 ci BB / LS1
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Axle/Gears: '91 "1LE" rear, posi w/ 3.23's
Re: cutting pro kit springs

Eibach SPORTLINES !
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Old Jun 24, 2012 | 08:45 PM
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From: Raleigh, NC
Car: 1988 Flame Red Trans am GTA
Engine: Forged 355 4 Bolt, FIRST TPI
Transmission: 700r4
Axle/Gears: ls1 torsen 3.42 gear
Re: cutting pro kit springs

i heard that those dont handle as well as the prokit springs...... i gotta have my ride handle well.... its setup for the turns....
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Old Jun 24, 2012 | 10:05 PM
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From: Winnipeg
Car: 91 GTA
Engine: L98
Transmission: 700R4
Axle/Gears: 3:73
Re: cutting pro kit springs

i love my pro kit but i would lower the front 1/2 to 3/4''.
wondering if its worth removing the insolator and using heater hose.

btw how much lower did you want to go?

Last edited by T/Atime; Jun 24, 2012 at 10:20 PM.
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Old Jun 25, 2012 | 06:28 PM
  #5  
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From: Raleigh, NC
Car: 1988 Flame Red Trans am GTA
Engine: Forged 355 4 Bolt, FIRST TPI
Transmission: 700r4
Axle/Gears: ls1 torsen 3.42 gear
Re: cutting pro kit springs

i wanted to lower it maybe an inch more in the back and a half in the front.....
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Old Jul 1, 2012 | 01:01 AM
  #6  
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Re: cutting pro kit springs

Before cutting I'd try heater hose on the front springs and some 4th gen isolators on the rears. If the rear isn't low enough then....try the heater hose there too. Once you cut them you can't go back.
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Old Jul 1, 2012 | 06:50 AM
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Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: cutting pro kit springs

Originally Posted by toomany
Before cutting I'd try heater hose on the front springs and some 4th gen isolators on the rears. If the rear isn't low enough then....try the heater hose there too.
I doubt that heater hose is much different than the front OE isolator. Fourthgen rear isolators will jack the car up. Heater hose at the rear lowered my car about a 1/2", IIRC.

JamesC
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Old Jul 1, 2012 | 09:38 AM
  #8  
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Re: cutting pro kit springs

I've run stock springs in front with NO isolators or heater hose. Doesn't work in the rear, but it works well in front. Bear in mind that once the front lower arms go past level, you're hurting the camber curve, which reduces cornering power far more than the lower CG and moved roll-center help. Get the longest ball joints you can find, then build around those. Those help the camber curve.
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Old Jul 2, 2012 | 09:59 AM
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From: Montreal, Canada
Car: 1986 Chevrolet Camaro IROC-Z28
Engine: TPI 310ci (LB9)
Transmission: Custom Rebuilt 700R4 - 2600 Stall
Axle/Gears: 10 bolt, 3.73 Eaton Limited-Slip
Re: cutting pro kit springs

Originally Posted by Atilla the Fun
I've run stock springs in front with NO isolators or heater hose. Doesn't work in the rear, but it works well in front. Bear in mind that once the front lower arms go past level, you're hurting the camber curve, which reduces cornering power far more than the lower CG and moved roll-center help. Get the longest ball joints you can find, then build around those. Those help the camber curve.
Agree on the ball joints. Get HOWE extended ball joints. I have those and they work well. The boots didn't fit properly and my mechanic had to find one that fit from another car. You can buy 0.5" or 0.75" extended versions, meaning that it will lower CG in relation to roll center meaning it will bring the geometry closer to what it was stock before you dropped your car with the pro-kit. I bought 0.75" extended ball joints but for some reason only got 0.5" drop from what I calculated. I was still happy with the drop though.
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Old Jul 2, 2012 | 10:53 PM
  #10  
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Re: cutting pro kit springs

Originally Posted by JamesC
I doubt that heater hose is much different than the front OE isolator. Fourthgen rear isolators will jack the car up. Heater hose at the rear lowered my car about a 1/2", IIRC.

JamesC
You're right on the rear isolators. It was late and I was tired and trying to think.

And you're probably right about the front ones too. The factory ones are usually flattened pretty well when you remove them.
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