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how much to lower rear?

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Old Apr 9, 2005 | 05:36 PM
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Default how much to lower rear?

I lowered the car front and rear about a month ago, hoping it would settle more over time - which it didnt. The front looks great, but the rear is still too high. I got the longer bolts, but remember threads a while back saying you run into problems when you put the longer bolts on the rear. Is there a certain height the back needs to be up over the front? Any advice would be much appreciated. Thanks!
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Old Apr 9, 2005 | 06:02 PM
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The only problem is that you need to get it aligned after you lower it, but that applies whether you use longer bolts or not.
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Old Apr 9, 2005 | 07:57 PM
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No problems with longer bolts - see sig.

EG
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Old Apr 9, 2005 | 10:43 PM
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I cut the front bushing off and put the longer bolts in the rear, it still rides great.
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Old Apr 9, 2005 | 11:21 PM
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Engineer,
You need to keep the original rake of the car. Rake is the relation of the front to the rear height.
If you have the stock measurements use those and keep the amount of lowering of the front about the same at the rear.
Hope that is not confusing.
Dave
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Old Apr 11, 2005 | 10:45 AM
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Originally Posted by corvette dave
Engineer,
You need to keep the original rake of the car. Rake is the relation of the front to the rear height.
If you have the stock measurements use those and keep the amount of lowering of the front about the same at the rear.
Hope that is not confusing.
Dave
I think that's what i remember reading. Any chance someone has the exact rake of a stock vette? I've heard serious handling problems happen if that "rake" isn't enough - something about the downforce on the hood that offers stability at high speed being completely gone.
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Old Apr 11, 2005 | 11:46 AM
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What happens if you have too much rake? ie the front alot lower than the back.
jeff
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Old Apr 11, 2005 | 01:11 PM
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Stock measurements from wheel arch to ground before I lowered my 00 Coupe were: frt-27-1/2; rr-28-7/8. After 25-3/4 & 27.
Fred
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Old Apr 11, 2005 | 04:20 PM
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Thanks for the specs Fred. I think i'm going to try and keep at least 1 inch higher in the back than the front. As far as too much rake, i think you could actually have too much surface area exposed, if you were to look at it in its extremes, a car that looked like this ---- would have a whole lost less wind resistance than a car like this /
/
Does this make sense?
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Old Apr 11, 2005 | 04:54 PM
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Seems like I've heard that the rear needs to be 1/2 to 1 inch higher than the front. I believe it has to do with the active handling. Somebody will correct me if I'm wrong.
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Old Apr 11, 2005 | 06:49 PM
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If you cut the front bushings off completely, that's metal on metal, right? There's no way that can be good it.... prove me wrong on this one.
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Old Apr 12, 2005 | 12:02 AM
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Originally Posted by 98NassauBluC5
If you cut the front bushings off completely, that's metal on metal, right? There's no way that can be good it.... prove me wrong on this one.
I completely removed my front bolts and installed longer bolts in the rear. I used a thin but hard piece of reinforced silicone hose between the transverse leaf and the lower A arm.

EG
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Old Apr 12, 2005 | 02:59 AM
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Originally Posted by EnglandGreen
I completely removed my front bolts and installed longer bolts in the rear. I used a thin but hard piece of reinforced silicone hose between the transverse leaf and the lower A arm.

EG
Me too and no problems to date. I used a piece of dynamat though instead of the silicone hose, but same idea. Lots of people have done it w/o any problems. IMO this is the only way to go about lowering it in the front. Anything less is hardly noticible.

--Marc
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Old Apr 12, 2005 | 05:55 AM
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Originally Posted by Lithium
Me too and no problems to date. I used a piece of dynamat though instead of the silicone hose, but same idea. Lots of people have done it w/o any problems. IMO this is the only way to go about lowering it in the front. Anything less is hardly noticible.

--Marc
Marc,
I had 2 pieces of Dynamat Extreme originally - they wore straight through and I had metal on fibreglass in just a couple of weeks. Went with the reinforced silicone rubber after that experience.

Just my 2 cents

EG
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Old Apr 12, 2005 | 07:04 PM
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Originally Posted by EnglandGreen
Marc,
I had 2 pieces of Dynamat Extreme originally - they wore straight through and I had metal on fibreglass in just a couple of weeks. Went with the reinforced silicone rubber after that experience.

Just my 2 cents

EG
What exactly would reinforced silicone look like? Where would i get it??

--Marc
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Old Apr 12, 2005 | 07:09 PM
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Originally Posted by Lithium
What exactly would reinforced silicone look like? Where would i get it??

--Marc
Home Depot. I just measured the width of the spring end and bought a short length of some big hose. Cut it down to size and slipped it over the end where the bolt was (I dropped my lower A arm, by the way)

EG
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