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Old 04-18-2014, 06:48 PM   #1
Danny51
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Pros and Cons of Lowering ?

Hey guys,

I've been looking into lowering my E30 for some time now, and will most likely be doing so very soon. I was wondering if you guys can give me a rundown on some of the pros and Cons, its more the Cons I dont know much about. I'm quite the noob when it comes to suspension stuff/lowering so let me know!

Its most likely going to be a 1"-2" drop on Lowering Springs and Aftermarket Shocks/Struts. Its for my DD, not track use


Thanks !
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Old 04-19-2014, 08:57 AM   #2
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If done correctly, lowering will improve your handling by stiffening springs, improving spring rates and the resulting lower centre of gravity will improve the handling specifically in the corners where it will run flatter with less wheel hop....

The possible cons really come into play when you lower too much. Slammed (significantly lowered) cars suffer from being lowered too much. When a car is lowered too much, the suspension cannot function correctly as there is so little range in the suspension due to the excessive lowering to absorb bumps and sudden changes in the road surface... This excessive lowering will also cause excessive camber causing extremely premature wearing of the inside edge of the tires. When it's lowered too much your putting excessive stress on CV joints, CV boots, and many of the suspension components because they are operating at the edge of their usable range...

The amount you're considering will not harm the car, tires or suspension. It will provide all the positive effects listed without harming the suspension or tires... You will have somewhere about 1.5 additional degrees of additional camber which will help in the corners without causing excessive tire wear (camber cannot be adjusted on the BMWs without camber plates, so the more you lower, the more camber is introduced.... If you want a softer ride, go with Eibach shocks, I personnally wanted a slightly stiffer suspension, so I went Bilstein and H&R. Currently installing H&R Coilovers in my e90 335Xi. Dropped about 1.5" in the front; rears to be installed today once the temp rises....
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Old 04-19-2014, 03:13 PM   #3
Danny51
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Quote:
Originally Posted by nachos23 View Post
If done correctly, lowering will improve your handling by stiffening springs, improving spring rates and the resulting lower centre of gravity will improve the handling specifically in the corners where it will run flatter with less wheel hop....

The possible cons really come into play when you lower too much. Slammed (significantly lowered) cars suffer from being lowered too much. When a car is lowered too much, the suspension cannot function correctly as there is so little range in the suspension due to the excessive lowering to absorb bumps and sudden changes in the road surface... This excessive lowering will also cause excessive camber causing extremely premature wearing of the inside edge of the tires. When it's lowered too much your putting excessive stress on CV joints, CV boots, and many of the suspension components because they are operating at the edge of their usable range...

The amount you're considering will not harm the car, tires or suspension. It will provide all the positive effects listed without harming the suspension or tires... You will have somewhere about 1.5 additional degrees of additional camber which will help in the corners without causing excessive tire wear (camber cannot be adjusted on the BMWs without camber plates, so the more you lower, the more camber is introduced.... If you want a softer ride, go with Eibach shocks, I personnally wanted a slightly stiffer suspension, so I went Bilstein and H&R. Currently installing H&R Coilovers in my e90 335Xi. Dropped about 1.5" in the front; rears to be installed today once the temp rises....
All the answers I was looking for ! Thanks !!

My main worry was suspension parts being worn out or excessive tire wear, but if my amount of lowering wont cause those problems then Im definitely going forward with it.

Thanks again
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Old 04-20-2014, 08:05 PM   #4
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You shouldn't have a problem with 1-2" drop. You won't regret it, unless you're driving in a pothole filled area.
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Old 04-21-2014, 06:28 PM   #5
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It will lower your centre of gravity. Add a front strut brace to improve wheel chatter in the corners and you'll be very happy..
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Old 04-22-2014, 01:34 PM   #6
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You'll never notice a difference with a front strut brace on these cars so don't waste your money.

I'm not sure what "wheel chatter" is but if you're getting some sort of vibration, something is wrong!
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Old 04-23-2014, 12:31 AM   #7
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Happened to me today, con!

And that happened @ 50kph
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Old 04-23-2014, 02:47 AM   #8
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OUCH!

Never had that happen in all my years and km's driving lowered BMWs .... how much was it lowered...

To address the strut bar question.ll It will make a difference in corners especially with these cars adn their strut towers.... Check out the posts in regards to strut tower cracking and separation... These cars are prone to strut tower issues due to excessive flex in the front chassis.... The strut tower in "sharing" cornering loads between both towers, reduces flex in the individual towers and improves cornering by keeping more consistant downforce in corners on the outside wheel....
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Old 04-23-2014, 09:28 AM   #9
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OUCH!

Never had that happen in all my years and km's driving lowered BMWs .... how much was it lowered.
Not lowered too much. I was in the middle of doing a lane change and didn't see the 6inch rock on the road, and the oil pan took a direct hit
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Old 04-24-2014, 11:14 PM   #10
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Bent two wheels yesterday on the Gardiner - pothole
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Old 04-25-2014, 09:57 AM   #11
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You'll never notice a difference with a front strut brace on these cars so don't waste your money.
It might be less noticeable on an E30 with stock suspension and/or cheap tires.

But with stiff suspension and grippy tires I could feel the difference in chassis flex through hard cornering with and without the shock tower brace.

The chassis on new cars have much better torsional rigidity so it'd probably be less noticeable than with these old rinky dink tin cans we drive
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Old 04-25-2014, 09:59 AM   #12
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Quote:
Originally Posted by Bullet Ride View Post
It might be less noticeable on an E30 with stock suspension and/or cheap tires.

But with stiff suspension and grippy tires I could feel the difference in chassis flex through hard cornering with and without the shock tower brace.
Which one do you have? I've always wanted to buy a Sparco brace for mine and modify it to make it a bit stronger.
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Old 04-25-2014, 10:01 AM   #13
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Which one do you have? I've always wanted to buy a Sparco brace for mine and modify it to make it a bit stronger.
I've got the sparco brace.
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Old 04-25-2014, 12:56 PM   #14
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I have the Racing Dynamics brace. Never buy a brace with adjustable links... Full solid braces are the only true braces as they are designed to the exact specifications for the model.
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