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Difference suspension geometry AP1-AP2?

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Old Jun 24, 2008 | 09:49 AM
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Default Difference suspension geometry AP1-AP2?

Hello boys, you have photos or documents where I can see the differences between geometry suspensions?

To understand and update

thank you
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Old Jun 24, 2008 | 10:19 AM
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No geometry differences that I know of. Spring rates, shock damping and swaybar stiffness are the only differences.
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Old Jun 25, 2008 | 10:42 AM
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up
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Old Jun 26, 2008 | 09:33 AM
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Originally Posted by Elistan,Jun 24 2008, 01:19 PM
No geometry differences that I know of. Spring rates, shock damping and swaybar stiffness are the only differences.
Apologize for my ignorance

When people refer to "suspension geometry", what does that really refer to?

I often get confused about these things ....

Thanks
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Old Jun 26, 2008 | 09:41 AM
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there are differences to the suspension geometry according to the Best Motoring video I've seen where the SPOON President explains the differences in the AP1 and AP2.
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Old Jun 26, 2008 | 09:48 AM
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Originally Posted by Ks320,Jun 26 2008, 09:33 AM
Apologize for my ignorance

When people refer to "suspension geometry", what does that really refer to?

I often get confused about these things ....

Thanks
Actual changes in the design of suspension components that alters the range of movement that probably also alters wheel contact against the pavement. (mounting points, changes to the control arms, change in caster, etc...)

These changes would ultimately be seen in how the wheel contacts the pavement under various loads and cornering maneuvers.

Basically, Elistan is saying if there were no shocks and springs in an AP1 and AP2, the range of movement would be identical. the vertical movement up and down movement of the wheels, are only different because of the different characteristics of the springs.

The stiffer front sway bar reinforces the frame and reduces chassis flex during cornering. Since it's the front sway bar, this tends to make the car understeer, where as a stiffer rear sway tends to make cars oversteer. Since we have a rwd car, which has a natural tendency to oversteer, Honda stiffened the front sway in order to make it "safer" with less oversteer tendencies in the AP2.

But as far as I know, I was under the impression that there were indeed changes to the suspension geometry.
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Old Jun 26, 2008 | 11:03 AM
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Originally Posted by TKim103,Jun 26 2008, 01:41 PM
there are differences to the suspension geometry according to the Best Motoring video I've seen where the SPOON President explains the differences in the AP1 and AP2.
I believe this is the video you are referring to.

http://www.gtchannel.com/content.php?cid=17003

According to this video, the model year 2004 chassis has less anti-dive in the front suspension when compared to the old chassis.

This means that under braking, more of the braking force is reacted through the front suspension links, than the front spring in the AP1 chassis. Since there is more anti-dive in the AP1, it could be the reason that upper A-arm brackets tend to "crack' on these cars.

I wish I had the elasto-kinematics data for the S2000.

Correct me if I'm wrong.

Also interesting reads:

https://www.s2ki.com/forums/index.php?showtopic=378266
https://www.s2ki.com/forums/index.ph...ic=50244&st=25
https://www.s2ki.com/forums/index.ph...ic=219249&st=0
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Old Jun 26, 2008 | 06:52 PM
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The rear subframe and rear suspension mounting points are different for the AP2 as well. Honda eleminated the roll understeer and retuned the rest of the suspension accordingly.

A stiffer FSB (or RSB) does NOT make the chassis any stiffer, reinforce the frame, or reduce chassis flex during cornering.
In fact, stiffer anti-sway bars INCREASE chassis flex during cornering.
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Old Jun 26, 2008 | 07:06 PM
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Originally Posted by chino101,Jun 26 2008, 11:03 AM
Since there is more anti-dive in the AP1, it could be the reason that upper A-arm brackets tend to "crack' on these cars.
Doubtful. The AP1 A-arms didn't crack as much as tear their spot welds.

The AP2 remedied this with seam welding.
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Old Jun 26, 2008 | 07:56 PM
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Originally Posted by kndonlee,Jun 26 2008, 12:48 PM
Actual changes in the design of suspension components that alters the range of movement that probably also alters wheel contact against the pavement. (mounting points, changes to the control arms, change in caster, etc...)

These changes would ultimately be seen in how the wheel contacts the pavement under various loads and cornering maneuvers.

Basically, Elistan is saying if there were no shocks and springs in an AP1 and AP2, the range of movement would be identical. the vertical movement up and down movement of the wheels, are only different because of the different characteristics of the springs.

The stiffer front sway bar reinforces the frame and reduces chassis flex during cornering. Since it's the front sway bar, this tends to make the car understeer, where as a stiffer rear sway tends to make cars oversteer. Since we have a rwd car, which has a natural tendency to oversteer, Honda stiffened the front sway in order to make it "safer" with less oversteer tendencies in the AP2.

But as far as I know, I was under the impression that there were indeed changes to the suspension geometry.
Cool, tks
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