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      02-27-2020, 02:28 PM   #23
clutchdj
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Wtf thread is this. Spacers have nothing to do with bound and rebound.
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      02-27-2020, 04:15 PM   #24
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Quote:
Originally Posted by clutchdj View Post
Wtf thread is this. Spacers have nothing to do with bound and rebound.
You wanna bet?
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      02-28-2020, 07:25 AM   #25
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Unless you are running 25MM+ spacers on the back of an 80’s 911, you are not going to feel any in difference vertical suspension geometry. Understeer, drop throttle over steer, or an increased steering radius are the more noticeable “performance” impacts that spacers create depending on which axles the spacers are mounted on.

Here is more:
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      02-28-2020, 07:29 AM   #26
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My 2 cents on spacers...no change in road feel to me

I installed 12mm rear 15mm front (BMS) and have noticed no change in road feel. I live in South Florida so we have generally smooth roads.

Not a dramatic change but not expensive either, plus gave me a chance to really clean hub and calipers, plus the BMS lugs look better.

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      02-28-2020, 09:34 AM   #27
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Well, we have A LOT of cobblestone roads here and uneven grainy pavement and thats where the difference was felt only... vibrations from road feel were more apparent in the car about 25% more.

The big bumpy stuff seems unchanged really or not noticeable.

If you live in a place with OK roads then you wont notice a difference for sure.

We actually thought the suspension was going to be smoother for sure since in some suspensions setups the rates may lower... but this was not the case here...
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      02-28-2020, 10:41 AM   #28
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Well; it seems to me that you get a very sensible butt
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      02-28-2020, 12:10 PM   #29
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I'm curious why no one has mentioned the additional unsprung weight of wheel spacers. People try to find lighter wheels but then add spacers which adds more weight. Disclaimer: I've never run spacers. "Back in the day" spacers were thought to contribute to increased strain and wear on the wheel bearings. Educate me.
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      02-28-2020, 12:29 PM   #30
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Quote:
Originally Posted by mjposner View Post
I installed 12mm rear 15mm front (BMS) and have noticed no change in road feel. I live in South Florida so we have generally smooth roads.

Not a dramatic change but not expensive either, plus gave me a chance to really clean hub and calipers, plus the BMS lugs look better.

Attachment 2248879
that gap, though.
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      02-28-2020, 01:06 PM   #31
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Quote:
Originally Posted by SD ///M4 View Post
I'm curious why no one has mentioned the additional unsprung weight of wheel spacers. People try to find lighter wheels but then add spacers which adds more weight. Disclaimer: I've never run spacers. "Back in the day" spacers were thought to contribute to increased strain and wear on the wheel bearings. Educate me.
Though the point you're making is correct, the OP is asking about a 12mm spacer which weights what? 3/4lbs maybe 1lbs at most?? I too thought exactly as you did until you factor in the actual weight of a spacer because it's certainly not the geometry of the suspension being altered to change the feel. If this was a 25mm+ spacer that weighs a considerable amount, sure, we'd likely agree with that statement but that's not the case here with a 12mm. This is for sure a placebo effect kind of situation.
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      02-28-2020, 04:45 PM   #32
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Edit. Nvr mind.
The mind can be a terrible convincer.
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      02-29-2020, 07:41 AM   #33
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To compensate for my 4lbs of spacer weight I went on a diet

"that gap, though." That gap > cost of lowering + speed bumps everywhere
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      02-29-2020, 08:00 AM   #34
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I consider myself pretty sensitive to changes in handling and ride quality, and I didn't notice a single change other than slightly more tramlining. However, if there's an existing issue with the suspension I suspect spacers would bring those more to light.
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      02-29-2020, 08:19 AM   #35
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18mm burger motorsports front and rear on H&R supersport's. No change in ride quality at all...whether putting around town or at speed on the highway. The Tommy L mudflaps def keep the slinging/chipping under control.
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      03-01-2020, 10:47 PM   #36
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Wheel spacers absolutely affect ride. They change the length of the lever arm by which the tire applies load to the spring and damper, so they will effectively soften both while magnifying the effects of road bumps and reducing the unsprung mass natural frequency.

I'm pretty confident I could feel the difference, but that's what I do for a living. I would guess most people wouldn't notice, but some would.
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      03-01-2020, 11:02 PM   #37
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Quote:
Originally Posted by Racer20 View Post
Wheel spacers absolutely affect ride. They change the length of the lever arm by which the tire applies load to the spring and damper, so they will effectively soften both while magnifying the effects of road bumps and reducing the unsprung mass natural frequency.

I'm pretty confident I could feel the difference, but that's what I do for a living. I would guess most people wouldn't notice, but some would.
Hey Racer20,

Great to have you here... can you please clarify how they soften the ride but at the same time transmit more imperfections of the road to the driver because the latter is what I felt, a much harsher ride.

Thanks!
JC

Last edited by Jerich0; 03-01-2020 at 11:15 PM..
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      03-02-2020, 01:17 AM   #38
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Quote:
Originally Posted by Jerich0 View Post
Quote:
Originally Posted by Racer20 View Post
Wheel spacers absolutely affect ride. They change the length of the lever arm by which the tire applies load to the spring and damper, so they will effectively soften both while magnifying the effects of road bumps and reducing the unsprung mass natural frequency.

I'm pretty confident I could feel the difference, but that's what I do for a living. I would guess most people wouldn't notice, but some would.
Hey Racer20,

Great to have you here... can you please clarify how they soften the ride but at the same time transmit more imperfections of the road to the driver because the latter is what I felt, a much harsher ride.

Thanks!
JC
Longer lever arm means forces applied will have more torque. Therefor road imperfections will transmit more force. The suspension will have to deal with more forces from the wheel, therefor it is essentially "softer" with longer lever arms.
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      03-02-2020, 04:49 AM   #39
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Quote:
Originally Posted by deemack79 View Post
18mm burger motorsports front and rear on H&R supersport's. No change in ride quality at all...whether putting around town or at speed on the highway. The Tommy L mudflaps def keep the slinging/chipping under control.
This is the perfect wheel offset. Nicely done!
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      03-02-2020, 07:00 AM   #40
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Spacers will make the ride slightly softer.

Changing wheel offset alters the wheel to spring/damper displacement ratios. With spacers, a larger wheel displacement translates to a smaller spring and damper displacement which reduces the effective spring and damper rates.

Albeit, that being said, it does so in a relatively small manner and will not be noticeable to most drivers. IMO, the biggest negative impact of altering wheel offset is on the front axle due to the effect it has on scrub radius and required Ackerman angle when the wheels are steered, which affect steering feel and feedback and tire grip.

EDIT: just saw Racer20 beat me to it.
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      03-02-2020, 07:09 AM   #41
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Quote:
Originally Posted by Jerich0 View Post
Hey Racer20,

Great to have you here... can you please clarify how they soften the ride but at the same time transmit more imperfections of the road to the driver because the latter is what I felt, a much harsher ride.

Thanks!
JC
They soften the apparent spring and damper rates but softer springs and dampers allow more wheel travel and body motion, which can be perceived as harshness depending on the type of road input. Softer dampers also allow the springs to store more energy in compression, which then return that energy more abruptly when the wheel rebounds.

Softer is not always more comfortable.
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      03-02-2020, 06:12 PM   #42
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When I add spacers I plan on just driving naked to compensate for the added weight of said spacers.
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      03-04-2020, 02:08 AM   #43
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As you increase leverage on the spring and damper it will get softer. But it is such a small amount so i don't think anyone can notice the difference really.

Last edited by M 4 FUN; 03-04-2020 at 02:17 AM..
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      03-04-2020, 06:32 AM   #44
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Quote:
Originally Posted by M 4 FUN View Post
As you increase leverage on the spring and damper it will get softer. But it is such a small amount so i don't think anyone can notice the difference really.
I wouldn’t say “anyone”. It is probably not noticeable to a majority of drivers, but some more sensitive ones will feel the difference.
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