weight reduction = messed up suspension geometry?
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Joined: Nov 2003
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From: Oklahoma City
Car: 1991 Firebird
Engine: 3.1L +bolt ons
Transmission: 700R4
Axle/Gears: Moser forged, 3.73, SLP posi
weight reduction = messed up suspension geometry?
I've been taking weight out of my car over several years, and it is really starting to add up. Most of it has come out of the front, and I estimate it to be a little over 200 lbs (added up individual weights of parts removed. yes, i weighed them). So now the nose is sitting higher than stock, even with 1 inch lowering springs.
Is a higher front messing up my steering? Or is this a non-issue on a street car?
Would 2 inch lowering springs fix the issue or make it worse? Or is there a better solution?
Thanks!
Is a higher front messing up my steering? Or is this a non-issue on a street car?
Would 2 inch lowering springs fix the issue or make it worse? Or is there a better solution?
Thanks!
Re: weight reduction = messed up suspension geometry?
is something wrong with your steering?????
with the front sitting higher than the rear it wil make weight shift from the front towards the rear......
with the front sitting higher than the rear it wil make weight shift from the front towards the rear......
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Supreme Member
iTrader: (4)
Joined: Nov 2003
Posts: 1,049
Likes: 1
From: Oklahoma City
Car: 1991 Firebird
Engine: 3.1L +bolt ons
Transmission: 700R4
Axle/Gears: Moser forged, 3.73, SLP posi
Re: weight reduction = messed up suspension geometry?
Nah, it drives fine, other than being a little twitchy from my random-*** suspension setup. You see on here all the time how lowering will hurt your handling, so I figured the opposite was true as well....
Last edited by brutalform; Apr 8, 2010 at 10:17 AM.
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Joined: Aug 2005
Posts: 439
Likes: 1
From: Round Rock
Car: 1989 Formula 350 LSX
Engine: 5.3, 234/228 cam
Transmission: Stage II 4L60e, Vigilante 3200
Axle/Gears: 3.42
Re: weight reduction = messed up suspension geometry?
you definitely need a different set of springs, maybe cut the v6 springs? I went with an iron block LQ9 with the AC removed (from a 350 TPI) and now my front end has about 6" of fender gap....not exagerating at all. It's so bad that the outside of the tires feather very quickly while the mid-section still has plenty of tread.
God forbid you drop in an LS1! lol
God forbid you drop in an LS1! lol
Re: weight reduction = messed up suspension geometry?
you definitely need a different set of springs, maybe cut the v6 springs? I went with an iron block LQ9 with the AC removed (from a 350 TPI) and now my front end has about 6" of fender gap....not exagerating at all. It's so bad that the outside of the tires feather very quickly while the mid-section still has plenty of tread.
God forbid you drop in an LS1! lol
God forbid you drop in an LS1! lol
Sounds like you need to adjust the caster camber the plates on top of your struts. I don't know too much about it myself, just familiar with the concept on my mustang. I have adjustable plates for it and saw they make em for 3rdgens now too. I know drag settings are diff than street, drag being more of less roll res and street prob like factory. I think a good aliment shop can set it for yah. There is also a tool you stick on the wheel for the degrees, but it's costly. I wouldn't recommend just slaping some adjustables on and playing with it.
Depends on how much your tires cost and how fast your wearing them out too I guse.
FYI been dropping pounds on my TA noticed a lot of rise too, didn't get nearly as much on my foxbody, but it was a 4-popper to start SBC 4tw!
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Joined: Aug 2005
Posts: 439
Likes: 1
From: Round Rock
Car: 1989 Formula 350 LSX
Engine: 5.3, 234/228 cam
Transmission: Stage II 4L60e, Vigilante 3200
Axle/Gears: 3.42
Re: weight reduction = messed up suspension geometry?
I'm sure an alignment would help with getting the wheels back on track but it won't get the fender gap back down to stock. The front end is just too light to sit right with the stock springs. The car has a negative rake to it, for us it sounds like the only way to get it level again is going to be new springs that sit right with the lighter weight, and a re-alignment.
Re: weight reduction = messed up suspension geometry?
my front end has about 6" of fender gap....not exagerating at all.
My base V8 springs raised the front nearly 3" with an iron block swap and AC delete. V6 or very low drop springs may get the job done, but youll most likely be cutting coils to get the ride height perfect
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Joined: May 2007
Posts: 2,340
Likes: 2
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: weight reduction = messed up suspension geometry?
This is really complicated and there are a few threads explaining this... (see Ultimate Third Gen Suspension thread). But the bottom line is if you lighten the car and you are raising the front, therefore you will increase positive camber and are changing the car from it's stock geometry. Positive camber is bad on a street car and generally better for race cars (positive camber will facilitate the entry in the turn, where negative camber keep the car stable and more grounded in the turn, with more of the tire patch making contact with the pavement during the turn, the latter is favorable to most street racers.) Drop spindles keep the stock geometry and thus are a better choice than dropping the car via drop springs (that usually have crappy soft spring rates and change suspension geometry)...
I would get stock IROC springs (good, stiff spring rate) with the racecraft drop spindles (I have the springs, but the spindles are next in line on my to do list). There are other companies that offer spindles like Belltech and AJE, but i know the racecraft ones drop the front 2" properly, but are a tad pricey at around 550$!
I would get stock IROC springs (good, stiff spring rate) with the racecraft drop spindles (I have the springs, but the spindles are next in line on my to do list). There are other companies that offer spindles like Belltech and AJE, but i know the racecraft ones drop the front 2" properly, but are a tad pricey at around 550$!
Joined: Aug 2006
Posts: 12,805
Likes: 107
From: Central NJ
Car: 86 Trans Am
Engine: 408 stroker sbc
Transmission: TKO600
Axle/Gears: Moser full floater m9, 3:70 trutrac
Re: weight reduction = messed up suspension geometry?
they are probably not a huge seller, thus the higher price. I think its a quite reasonable price considering the over 7lbs of unsprung weight they remove, plus the benefits of proper geometry and already setup for popular brake upgrades.
Joined: May 2007
Posts: 2,340
Likes: 2
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: weight reduction = messed up suspension geometry?
I don't think too many people want to drop their rides a full 2" on the street.. So definitely not a huge seller, but for people who have raised ride heights cuz of weight reduction this is definitely better than 2" drop springs. The lighter weight, proper geometry and the fact they will accept popular brake setups definitely makes the 550$ worth it for what they are, but for the majority of people i'd say they are expensive.. I think that's why most people opt for cheaper drop springs without knowing about how suspension setups work.
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