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Car Bumpy at around 160-170KM/H

Mini-itx

By Mini-itx,
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Mini-itx

Mini-itx

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I am facing a problem with my car. My suspension is cheapo hotbits suspension with adjustable damper.

 

The problem I am facing is that when I go at 160-170, the car is rather bumpy going on uneven roads. I am just afraid there could be wheel lift causing me to los control of the car.

 

What could be the cause of this bumpiness? Could it be damper settings too soft, thus not absorbing the forces or too hard or do I need to change suspension.

 

Btw, I didn't face this issue with a BMW E39 528i quite sometime back. Its using blistein suspension (not coilovers, just normal springs and dampers). Its quite stable even at 170-180. Of course, I do get quite a bit of body roll when cornering compared to my current Toyota.

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Watwheels

Watwheels

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  On 9/30/2010 at 3:47 AM, Mini-itx said:

I am facing a problem with my car. My suspension is cheapo hotbits suspension with adjustable damper.

 

The problem I am facing is that when I go at 160-170, the car is rather bumpy going on uneven roads. I am just afraid there could be wheel lift causing me to los control of the car.

 

What could be the cause of this bumpiness? Could it be damper settings too soft, thus not absorbing the forces or too hard or do I need to change suspension.

 

Btw, I didn't face this issue with a BMW E39 528i quite sometime back. Its using blistein suspension (not coilovers, just normal springs and dampers). Its quite stable even at 170-180. Of course, I do get quite a bit of body roll when cornering compared to my current Toyota.

Any car will be bumpy on uneven roads. It's the law of physics. -_-

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Mini-itx

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  On 9/30/2010 at 3:51 AM, Watwheels said:

Any car will be bumpy on uneven roads. It's the law of physics. -_-

 

No, I meant that the way my car handle the bumps is alot worse compared the my E39 back then. Its jumps up and down more (as if there is no suspension), the car reacts to literaly every bump on the road, even small ones. S, I am moving around in the car quite alot and it get a little nervous.

 

Thus I am wondering is this is usually due to hard suspension (maybe damper settings to hard or soft) and my mountings (they are urethane ones which is very hard) or is it due to faulty suspension. I checked the suspension and they are not leaking.

 

 

 

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Blackyv

Blackyv

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  On 9/30/2010 at 3:47 AM, Mini-itx said:

I am facing a problem with my car. My suspension is cheapo hotbits suspension with adjustable damper.

 

The problem I am facing is that when I go at 160-170, the car is rather bumpy going on uneven roads. I am just afraid there could be wheel lift causing me to los control of the car.

 

What could be the cause of this bumpiness? Could it be damper settings too soft, thus not absorbing the forces or too hard or do I need to change suspension.

 

Btw, I didn't face this issue with a BMW E39 528i quite sometime back. Its using blistein suspension (not coilovers, just normal springs and dampers). Its quite stable even at 170-180. Of course, I do get quite a bit of body roll when cornering compared to my current Toyota.

 

 

[laugh] my goodness..... you are comparing your current toyota with previous 5 series on the high speed stability (i dont think u face "bumpy" but more like "floating" sensation at that speed) and body roll on corner.... [laugh]

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Mini-itx

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  On 9/30/2010 at 4:00 AM, Cerano said:

you said it yourself youre comparing a toyota vs a bmw

 

conti cars are definitely more stable

 

I don't think its due to that because my Toyota weighs 1.5 tons as well, just as much as the E39. Main difference is that E39 suspension is alot softer compared to my Toyota.

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Quantum

Quantum

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  On 9/30/2010 at 3:47 AM, Mini-itx said:

I am facing a problem with my car. My suspension is cheapo hotbits suspension with adjustable damper.

 

The problem I am facing is that when I go at 160-170, the car is rather bumpy going on uneven roads. I am just afraid there could be wheel lift causing me to los control of the car.

 

What could be the cause of this bumpiness? Could it be damper settings too soft, thus not absorbing the forces or too hard or do I need to change suspension.

 

Btw, I didn't face this issue with a BMW E39 528i quite sometime back. Its using blistein suspension (not coilovers, just normal springs and dampers). Its quite stable even at 170-180. Of course, I do get quite a bit of body roll when cornering compared to my current Toyota.

it's alert of "speeding" [:p][:p]

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  On 9/30/2010 at 3:55 AM, Beehive3783 said:

your suspension too stiff la..

 

So should I soften or harden my dampers? Cause the cornering is good. Very little body roll. But just that high speed not good. Feeling nervous.

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Haziqko

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  On 9/30/2010 at 5:20 AM, Mini-itx said:

So should I soften or harden my dampers? Cause the cornering is good. Very little body roll. But just that high speed not good. Feeling nervous.

 

 

i'm sure ur BMW weighs at least 2tons... and by the way are your tires low profiles...???

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Happily1986

Happily1986

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it is the degree of damping la which can be measured by a parameter known as the damping coefficient. your damping coefficient is probably 1 (i.e. critical damping) or more than 1 (i.e. overdamped)

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Mini-itx

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  On 9/30/2010 at 5:25 AM, Haziqko said:

i'm sure ur BMW weighs at least 2tons... and by the way are your tires low profiles...???

 

They are standard 225/40/18 tyres. All 4 wheels have the same tyres.

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Kr_toy

Kr_toy

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  On 9/30/2010 at 3:47 AM, Mini-itx said:

I am facing a problem with my car. My suspension is cheapo hotbits suspension with adjustable damper.

 

The problem I am facing is that when I go at 160-170, the car is rather bumpy going on uneven roads. I am just afraid there could be wheel lift causing me to los control of the car.

 

What could be the cause of this bumpiness? Could it be damper settings too soft, thus not absorbing the forces or too hard or do I need to change suspension.

 

Btw, I didn't face this issue with a BMW E39 528i quite sometime back. Its using blistein suspension (not coilovers, just normal springs and dampers). Its quite stable even at 170-180. Of course, I do get quite a bit of body roll when cornering compared to my current Toyota.

 

The main issue is your coilover has much less travel than your BMW suspension, and the second issue is BMW has heavier body and stronger(thicker) suspension components that provides less flexing.

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Beehive3783

Beehive3783

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  On 9/30/2010 at 5:20 AM, Mini-itx said:

So should I soften or harden my dampers? Cause the cornering is good. Very little body roll. But just that high speed not good. Feeling nervous.

You should soften so that the dampers can absorb more from the road. It's bumper cos the dampers are hard.

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