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Author Topic: RIDE HEIGHT
teofragoso
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Posts: 7
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Post RIDE HEIGHT
on: December 24, 2013, 20:11
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Hello;

I´m a bit confused with the ride height dimension, since it actually seems to be, graphically, the distance between the ground and the LCA inner chassis pick up point. when I make my design every dimension and angle seems correct compared with the real dimensions in the car but not this ride height (if it´s that distance between the ground and the chassis pick up point). I get a difference of 50 mm with the real thing and with everything else matching.

anybody can help on this?

many thanks!

T.J.
teofragoso
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Post Re: RIDE HEIGHT
on: December 25, 2013, 10:33
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Hello, more on the above;

I´ve found that somehing was wrong to me regarding the LCA chassis pick up point and the distance between this and the ground. Now, what I´ve found is that all measures matches with the real car measures except for that and the wheel dimesions!?....
I´ve managed to measure the wheel diameter and radius and the tyre profile in mm on the drawing and what I´ve found is that by introducing 205/55/16 in the tyre dimensions you actually don´t get the correct diameter/radius of the wheel which in my case is 632/316 mm, but entering 205/113/16 being 113 the tyre profile in mm you get the correct dimensions!!, and now every single measure in the design matches, including "ride height".

So, I guess I was doing wrong by entering 55 which is the percentage of tyre profile with respect to its width (a relative dimension instead a real dimension in mm)??

I really would like to know!.

many thanks. It´s just great and an incredible help having a tool like this to analyze/design our suspensions.

congratulations!.
racingaspi-
rations.co-
m
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Post Re: RIDE HEIGHT
on: December 27, 2013, 12:29
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The "ride height" is actually the distance between the lower control arm chassis joint and the ground so you have to factor in the distance between the LCA and the floor of the car.

Interesting find regarding the tyre profile. It should be the percentage as you would expect but you seem to have found a bug. Let me look into it and get back to you...
racingaspi-
rations.co-
m
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Post Re: RIDE HEIGHT
on: January 2, 2014, 14:41
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The tyre profile issue has now been corrected.
teofragoso
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Post Re: RIDE HEIGHT
on: January 3, 2014, 19:22
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ok, thanks very much.
muslimun
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Post Re: RIDE HEIGHT
on: February 6, 2014, 09:20
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Привет!!Вы понимаете по Русски?Hi! ​​Do you understand English?
racingaspi-
rations.co-
m
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Post Re: RIDE HEIGHT
on: February 11, 2014, 09:51
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Yes, I do.
rory
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Post Re: RIDE HEIGHT
on: October 18, 2014, 01:59
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Relating to ride height, I'm seeing something strange. I made a very simple (but unrealistic) setup with everything parallel or perpendicular to the ground.

http://racingasp.com/5r6ocsdx

The tires are 13 inches (330.2 mm), 160 mm section width and 53% ratio, so that makes the tire radius:

(330.2 / 2) + 160 * 0.53 ~= 250 mm

Given that the control arms are parallel to the ground, and the chassis height is 200 mm, I would expect the ride height to be the tire radius minus half of the chassis height:

250 - 100 = 150 mm

But the ride height I see is 145 mm. Where did that 5 mm go? Is there some tire deflection going on, or did I calculate the tire height incorrectly?
racingaspi-
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m
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Post Re: RIDE HEIGHT
on: October 22, 2014, 14:46
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Hi Rory,

Have you deleted the model as I can't see http://racingasp.com/5r6ocsdx. The ride height within the model is measure from the ground to the lower chassis control arm which maybe higher than the chassis floor height. On my cart there is an approx. 30mm difference between the lower chassis control arm and the chassis floor. Could this be why?

Regards,
Huw
rory
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Post Re: RIDE HEIGHT
on: October 22, 2014, 19:21
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Hi Huw,

Thanks for the reply. I must have accidentally deleted that model, so I rebuilt it here:

//www.racingaspirations.com/mods/jd9pccuw

What you're saying sounds plausible. It's just not clear from the calculator where I can set the offset of the lower chassis control arm from the chassis floor (perhaps I can't).
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